* [PATCH v2 00/14] vfprintf rework to remove vtables
@ 2022-05-23 14:06 Florian Weimer
2022-05-23 14:07 ` [PATCH v2 01/14] stdio-common: Add printf specifier registry to <printf.h> Florian Weimer
` (13 more replies)
0 siblings, 14 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:06 UTC (permalink / raw)
To: libc-alpha
This is a repost of the remaining uncommitted patches, rebased on the
current tree. I changed just the first and last patch as noted, and
resolved a merge conflict.
Thanks,
Florian
Florian Weimer (14):
stdio-common: Add printf specifier registry to <printf.h>
stdio-common: Move union printf_arg int <printf.h>
stdio-common: Simplify printf_unknown interface in vfprintf-internal.c
locale: Implement struct grouping_iterator
stdio-common: Introduce buffers for implementing printf
stdio-common: Add __printf_function_invoke
stdio-common: Add __translated_number_width
stdio-common: Convert vfprintf and related functions to buffers
stdio-common: Add lock optimization to vfprintf and vfwprintf
libio: Convert __vsprintf_internal to buffers
libio: Convert __vasprintf_internal to buffers
libio: Convert __vdprintf_internal to buffers
libio: Convert __obstack_vprintf_internal to buffers (bug 27124)
libio: Convert __vswprintf_internal to buffers (bug 27857)
elf/Makefile | 1 -
include/printf.h | 81 +-
include/printf_buffer.h | 332 ++++++++
libio/iovdprintf.c | 69 +-
libio/iovsprintf.c | 70 +-
libio/obprintf.c | 170 ++--
libio/tst-vtables-common.c | 9 +-
libio/tst_swprintf.c | 31 +-
libio/vasprintf.c | 141 ++--
libio/vsnprintf.c | 131 ++--
libio/vswprintf.c | 100 +--
manual/stdio.texi | 7 +-
stdio-common/Makefile | 28 +-
stdio-common/Xprintf_buffer_done.c | 40 +
stdio-common/Xprintf_buffer_flush.c | 72 ++
stdio-common/Xprintf_buffer_pad_1.c | 44 ++
stdio-common/Xprintf_buffer_putc_1.c | 29 +
stdio-common/Xprintf_buffer_puts_1.c | 37 +
stdio-common/Xprintf_buffer_write.c | 43 +
stdio-common/Xprintf_function_invoke.c | 42 +
stdio-common/grouping_iterator.c | 125 +++
stdio-common/grouping_iterator.h | 65 ++
stdio-common/printf-parse.h | 29 -
stdio-common/printf-prs.c | 1 +
stdio-common/printf_buffer-char.h | 24 +
stdio-common/printf_buffer-wchar_t.h | 24 +
stdio-common/printf_buffer_as_file.c | 148 ++++
stdio-common/printf_buffer_as_file.h | 87 +++
stdio-common/printf_buffer_done.c | 21 +
stdio-common/printf_buffer_flush.c | 81 ++
stdio-common/printf_buffer_pad_1.c | 21 +
stdio-common/printf_buffer_putc_1.c | 21 +
stdio-common/printf_buffer_puts_1.c | 21 +
stdio-common/printf_buffer_to_file.c | 122 +++
stdio-common/printf_buffer_to_file.h | 57 ++
stdio-common/printf_buffer_write.c | 21 +
stdio-common/printf_fp.c | 736 ++++++++----------
stdio-common/printf_fphex.c | 260 +++----
stdio-common/printf_function_invoke.c | 22 +
stdio-common/reg-printf.c | 7 -
stdio-common/translated_number_width.c | 42 +
stdio-common/tst-grouping_iterator.c | 262 +++++++
stdio-common/vfprintf-internal.c | 688 +++++-----------
stdio-common/vfprintf-process-arg.c | 172 ++--
stdio-common/wprintf_buffer_as_file.c | 153 ++++
stdio-common/wprintf_buffer_done.c | 21 +
stdio-common/wprintf_buffer_flush.c | 42 +
stdio-common/wprintf_buffer_pad_1.c | 21 +
stdio-common/wprintf_buffer_putc_1.c | 21 +
stdio-common/wprintf_buffer_puts_1.c | 21 +
stdio-common/wprintf_buffer_to_file.c | 55 ++
stdio-common/wprintf_buffer_write.c | 21 +
stdio-common/wprintf_function_invoke.c | 22 +
stdlib/strfmon_l.c | 196 ++---
stdlib/strfrom-skeleton.c | 38 +-
sysdeps/ia64/fpu/printf_fphex.c | 8 +-
.../ieee754/ldbl-128/printf_fphex_macros.h | 36 +-
sysdeps/ieee754/ldbl-128ibm/printf_fphex.c | 36 +-
sysdeps/ieee754/ldbl-96/printf_fphex.c | 22 +-
sysdeps/x86_64/fpu/printf_fphex.c | 21 +-
60 files changed, 3406 insertions(+), 1862 deletions(-)
create mode 100644 include/printf_buffer.h
create mode 100644 stdio-common/Xprintf_buffer_done.c
create mode 100644 stdio-common/Xprintf_buffer_flush.c
create mode 100644 stdio-common/Xprintf_buffer_pad_1.c
create mode 100644 stdio-common/Xprintf_buffer_putc_1.c
create mode 100644 stdio-common/Xprintf_buffer_puts_1.c
create mode 100644 stdio-common/Xprintf_buffer_write.c
create mode 100644 stdio-common/Xprintf_function_invoke.c
create mode 100644 stdio-common/grouping_iterator.c
create mode 100644 stdio-common/grouping_iterator.h
create mode 100644 stdio-common/printf_buffer-char.h
create mode 100644 stdio-common/printf_buffer-wchar_t.h
create mode 100644 stdio-common/printf_buffer_as_file.c
create mode 100644 stdio-common/printf_buffer_as_file.h
create mode 100644 stdio-common/printf_buffer_done.c
create mode 100644 stdio-common/printf_buffer_flush.c
create mode 100644 stdio-common/printf_buffer_pad_1.c
create mode 100644 stdio-common/printf_buffer_putc_1.c
create mode 100644 stdio-common/printf_buffer_puts_1.c
create mode 100644 stdio-common/printf_buffer_to_file.c
create mode 100644 stdio-common/printf_buffer_to_file.h
create mode 100644 stdio-common/printf_buffer_write.c
create mode 100644 stdio-common/printf_function_invoke.c
create mode 100644 stdio-common/translated_number_width.c
create mode 100644 stdio-common/tst-grouping_iterator.c
create mode 100644 stdio-common/wprintf_buffer_as_file.c
create mode 100644 stdio-common/wprintf_buffer_done.c
create mode 100644 stdio-common/wprintf_buffer_flush.c
create mode 100644 stdio-common/wprintf_buffer_pad_1.c
create mode 100644 stdio-common/wprintf_buffer_putc_1.c
create mode 100644 stdio-common/wprintf_buffer_puts_1.c
create mode 100644 stdio-common/wprintf_buffer_to_file.c
create mode 100644 stdio-common/wprintf_buffer_write.c
create mode 100644 stdio-common/wprintf_function_invoke.c
base-commit: 93ec1cf0fef422b137be7a99fdcdf007c318c71d
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 01/14] stdio-common: Add printf specifier registry to <printf.h>
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 14:37 ` Andreas Schwab
2022-05-23 14:07 ` [PATCH v2 02/14] stdio-common: Move union printf_arg int <printf.h> Florian Weimer
` (12 subsequent siblings)
13 siblings, 1 reply; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
Add __printf_arginfo_table, __printf_function_table,
__printf_va_arg_table, __register_printf_specifier to
include/printf.h.
---
v2: More identifiers moved, and stdio-common/printf-parse.h updated.
include/printf.h | 8 ++++++++
stdio-common/printf-parse.h | 6 ------
stdio-common/printf-prs.c | 1 +
stdio-common/reg-printf.c | 7 -------
stdio-common/vfprintf-internal.c | 1 -
5 files changed, 9 insertions(+), 14 deletions(-)
diff --git a/include/printf.h b/include/printf.h
index 0ed6e87387..fb0b71fa4c 100644
--- a/include/printf.h
+++ b/include/printf.h
@@ -12,6 +12,14 @@
# ifndef _ISOMAC
+/* Internal interfaces for registered specifiers. */
+extern printf_arginfo_size_function **__printf_arginfo_table attribute_hidden;
+extern printf_function **__printf_function_table attribute_hidden;
+extern printf_va_arg_function **__printf_va_arg_table attribute_hidden;
+int __register_printf_specifier (int, printf_function,
+ printf_arginfo_size_function);
+libc_hidden_proto (__register_printf_specifier)
+
#include <bits/types/locale_t.h>
/* Now define the internal interfaces. */
diff --git a/stdio-common/printf-parse.h b/stdio-common/printf-parse.h
index de0f289c1f..362cce1ead 100644
--- a/stdio-common/printf-parse.h
+++ b/stdio-common/printf-parse.h
@@ -97,12 +97,6 @@ read_int (const UCHAR_T * *pstr)
#endif
-/* These are defined in reg-printf.c. */
-extern printf_arginfo_size_function **__printf_arginfo_table attribute_hidden;
-extern printf_function **__printf_function_table attribute_hidden;
-extern printf_va_arg_function **__printf_va_arg_table attribute_hidden;
-
-
/* Find the next spec in FORMAT, or the end of the string. Returns
a pointer into FORMAT, to a '%' or a '\0'. */
__extern_always_inline const unsigned char *
diff --git a/stdio-common/printf-prs.c b/stdio-common/printf-prs.c
index 55d1c471d7..f2fb9182b8 100644
--- a/stdio-common/printf-prs.c
+++ b/stdio-common/printf-prs.c
@@ -21,6 +21,7 @@
#include <string.h>
#include <wchar.h>
#include <sys/param.h>
+#include <printf.h>
#include "../locale/localeinfo.h"
diff --git a/stdio-common/reg-printf.c b/stdio-common/reg-printf.c
index 400b99d2f6..5f4c6a24c2 100644
--- a/stdio-common/reg-printf.c
+++ b/stdio-common/reg-printf.c
@@ -30,13 +30,6 @@ printf_function **__printf_function_table attribute_hidden;
__libc_lock_define_initialized (static, lock)
-int __register_printf_specifier (int, printf_function,
- printf_arginfo_size_function);
-libc_hidden_proto (__register_printf_specifier)
-int __register_printf_function (int, printf_function,
- printf_arginfo_function);
-
-
/* Register FUNC to be called to format SPEC specifiers. */
int
__register_printf_specifier (int spec, printf_function converter,
diff --git a/stdio-common/vfprintf-internal.c b/stdio-common/vfprintf-internal.c
index 1986c4bdb5..f8aa2fdafb 100644
--- a/stdio-common/vfprintf-internal.c
+++ b/stdio-common/vfprintf-internal.c
@@ -1379,7 +1379,6 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
/* Process format specifiers. */
while (1)
{
- extern printf_function **__printf_function_table;
int function_done;
if (spec <= UCHAR_MAX
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 02/14] stdio-common: Move union printf_arg int <printf.h>
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
2022-05-23 14:07 ` [PATCH v2 01/14] stdio-common: Add printf specifier registry to <printf.h> Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 03/14] stdio-common: Simplify printf_unknown interface in vfprintf-internal.c Florian Weimer
` (11 subsequent siblings)
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
The type does not depend on wide vs narrow preprocessor macros,
so it does not need to be customized in stdio-common/printf-parse.h.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
---
include/printf.h | 21 +++++++++++++++++++++
stdio-common/printf-parse.h | 23 -----------------------
2 files changed, 21 insertions(+), 23 deletions(-)
diff --git a/include/printf.h b/include/printf.h
index fb0b71fa4c..78accaab6d 100644
--- a/include/printf.h
+++ b/include/printf.h
@@ -20,6 +20,27 @@ int __register_printf_specifier (int, printf_function,
printf_arginfo_size_function);
libc_hidden_proto (__register_printf_specifier)
+/* The various kinds of arguments that can be passed to printf. */
+union printf_arg
+ {
+ wchar_t pa_wchar;
+ int pa_int;
+ long int pa_long_int;
+ long long int pa_long_long_int;
+ unsigned int pa_u_int;
+ unsigned long int pa_u_long_int;
+ unsigned long long int pa_u_long_long_int;
+ double pa_double;
+ long double pa_long_double;
+#if __HAVE_FLOAT128_UNLIKE_LDBL
+ _Float128 pa_float128;
+#endif
+ const char *pa_string;
+ const wchar_t *pa_wstring;
+ void *pa_pointer;
+ void *pa_user;
+};
+
#include <bits/types/locale_t.h>
/* Now define the internal interfaces. */
diff --git a/stdio-common/printf-parse.h b/stdio-common/printf-parse.h
index 362cce1ead..249f789526 100644
--- a/stdio-common/printf-parse.h
+++ b/stdio-common/printf-parse.h
@@ -44,29 +44,6 @@ struct printf_spec
int size;
};
-
-/* The various kinds off arguments that can be passed to printf. */
-union printf_arg
- {
- wchar_t pa_wchar;
- int pa_int;
- long int pa_long_int;
- long long int pa_long_long_int;
- unsigned int pa_u_int;
- unsigned long int pa_u_long_int;
- unsigned long long int pa_u_long_long_int;
- double pa_double;
- long double pa_long_double;
-#if __HAVE_FLOAT128_UNLIKE_LDBL
- _Float128 pa_float128;
-#endif
- const char *pa_string;
- const wchar_t *pa_wstring;
- void *pa_pointer;
- void *pa_user;
- };
-
-
#ifndef DONT_NEED_READ_INT
/* Read a simple integer from a string and update the string pointer.
It is assumed that the first character is a digit. */
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 03/14] stdio-common: Simplify printf_unknown interface in vfprintf-internal.c
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
2022-05-23 14:07 ` [PATCH v2 01/14] stdio-common: Add printf specifier registry to <printf.h> Florian Weimer
2022-05-23 14:07 ` [PATCH v2 02/14] stdio-common: Move union printf_arg int <printf.h> Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 04/14] locale: Implement struct grouping_iterator Florian Weimer
` (10 subsequent siblings)
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
The called function does not use the args array, so there is no need
to produce it.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
---
stdio-common/vfprintf-internal.c | 21 +++------------------
1 file changed, 3 insertions(+), 18 deletions(-)
diff --git a/stdio-common/vfprintf-internal.c b/stdio-common/vfprintf-internal.c
index f8aa2fdafb..fb94961f37 100644
--- a/stdio-common/vfprintf-internal.c
+++ b/stdio-common/vfprintf-internal.c
@@ -672,8 +672,7 @@ static int printf_positional (FILE *s,
unsigned int mode_flags);
/* Handle unknown format specifier. */
-static int printf_unknown (FILE *, const struct printf_info *,
- const void *const *) __THROW;
+static int printf_unknown (FILE *, const struct printf_info *) __THROW;
/* Group digits of number string. */
static CHAR_T *group_number (CHAR_T *, CHAR_T *, CHAR_T *, const char *,
@@ -1465,19 +1464,7 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
LABEL (form_unknown):
{
- unsigned int i;
- const void **ptr;
-
- ptr = alloca (specs[nspecs_done].ndata_args
- * sizeof (const void *));
-
- /* Fill in an array of pointers to the argument values. */
- for (i = 0; i < specs[nspecs_done].ndata_args; ++i)
- ptr[i] = &args_value[specs[nspecs_done].data_arg + i];
-
- /* Call the function. */
- function_done = printf_unknown (s, &specs[nspecs_done].info,
- ptr);
+ int function_done = printf_unknown (s, &specs[nspecs_done].info);
/* If an error occurred we don't have information about #
of chars. */
@@ -1507,9 +1494,7 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
/* Handle an unknown format specifier. This prints out a canonicalized
representation of the format spec itself. */
static int
-printf_unknown (FILE *s, const struct printf_info *info,
- const void *const *args)
-
+printf_unknown (FILE *s, const struct printf_info *info)
{
int done = 0;
CHAR_T work_buffer[MAX (sizeof (info->width), sizeof (info->prec)) * 3];
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 04/14] locale: Implement struct grouping_iterator
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (2 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 03/14] stdio-common: Simplify printf_unknown interface in vfprintf-internal.c Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 20:00 ` Adhemerval Zanella
2022-05-24 13:31 ` Andreas Schwab
2022-05-23 14:07 ` [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf Florian Weimer
` (9 subsequent siblings)
13 siblings, 2 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
The iterator allows grouping while scanning forward through
the digits. This enables emitting digits as they are processed.
---
stdio-common/Makefile | 9 +-
stdio-common/grouping_iterator.c | 125 +++++++++++++
stdio-common/grouping_iterator.h | 65 +++++++
stdio-common/tst-grouping_iterator.c | 262 +++++++++++++++++++++++++++
4 files changed, 460 insertions(+), 1 deletion(-)
create mode 100644 stdio-common/grouping_iterator.c
create mode 100644 stdio-common/grouping_iterator.h
create mode 100644 stdio-common/tst-grouping_iterator.c
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index b1e9144de0..da3a3bc0c9 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -39,6 +39,7 @@ routines := \
gentempfd \
getline \
getw \
+ grouping_iterator \
iovfscanf \
isoc99_fscanf \
isoc99_scanf \
@@ -221,6 +222,10 @@ generated += \
siglist-aux.S \
# generated
+tests-internal = \
+ tst-grouping_iterator \
+ # tests-internal
+
test-srcs = tst-unbputc tst-printf tst-printfsz-islongdouble
ifeq ($(run-built-tests),yes)
@@ -288,13 +293,15 @@ LOCALES := \
hi_IN.UTF-8 \
ja_JP.EUC-JP \
ps_AF.UTF-8 \
- # LOCALES
+ tg_TJ.UTF-8 \
+ # LOCALES
include ../gen-locales.mk
$(objpfx)bug14.out: $(gen-locales)
$(objpfx)scanf13.out: $(gen-locales)
$(objpfx)test-vfprintf.out: $(gen-locales)
$(objpfx)tst-grouping.out: $(gen-locales)
+$(objpfx)tst-grouping_iterator.out: $(gen-locales)
$(objpfx)tst-sprintf.out: $(gen-locales)
$(objpfx)tst-sscanf.out: $(gen-locales)
$(objpfx)tst-swprintf.out: $(gen-locales)
diff --git a/stdio-common/grouping_iterator.c b/stdio-common/grouping_iterator.c
new file mode 100644
index 0000000000..cc169e2b09
--- /dev/null
+++ b/stdio-common/grouping_iterator.c
@@ -0,0 +1,125 @@
+/* Iterator for inserting thousands separators into numbers.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <grouping_iterator.h>
+
+#include <assert.h>
+#include <limits.h>
+#include <locale/localeinfo.h>
+#include <stdint.h>
+#include <string.h>
+
+/* Initializes *IT with no grouping information for a string of length
+ DIGITS, and return false to indicate no grouping. */
+bool
+__grouping_iterator_init_none (struct grouping_iterator *it, size_t digits)
+{
+ memset (it, 0, sizeof (*it));
+ it->remaining_in_current_group = digits;
+ it->remaining = digits;
+ return false;
+}
+
+static bool
+grouping_iterator_setup (struct grouping_iterator *it, size_t digits,
+ const char *grouping)
+{
+ /* We treat all negative values like CHAR_MAX. */
+
+ if (*grouping == CHAR_MAX || *grouping <= 0)
+ /* No grouping should be done. */
+ return __grouping_iterator_init_none (it, digits);
+
+ size_t remaining_to_group = digits;
+ size_t non_repeating_groups = 0;
+ size_t groups = 0;
+ while (true)
+ {
+ non_repeating_groups += *grouping;
+ if (remaining_to_group <= (unsigned int) *grouping)
+ break;
+
+ ++groups;
+ remaining_to_group -= *grouping++;
+
+ if (*grouping == CHAR_MAX
+#if CHAR_MIN < 0
+ || *grouping < 0
+#endif
+ )
+ /* No more grouping should be done. */
+ break;
+ else if (*grouping == 0)
+ {
+ /* Same grouping repeats. */
+ --grouping;
+ non_repeating_groups -= *grouping; /* Over-counted. */
+ size_t repeats = (remaining_to_group - 1) / *grouping;
+ groups += repeats;
+ remaining_to_group -= repeats * *grouping;
+ break;
+ }
+ }
+
+ it->remaining_in_current_group = remaining_to_group;
+ it->remaining = digits;
+ it->groupings = grouping;
+ it->non_repeating_groups = non_repeating_groups;
+ it->separators = groups;
+ return it->separators > 0;
+}
+
+/* Returns the appropriate grouping item in LOC depending on CATEGORY
+ (which must be LC_MONETARY or LC_NUMERIC). */
+static const char *
+get_grouping (int category, locale_t loc)
+{
+ return _nl_lookup (loc, category,
+ category == LC_MONETARY ? MON_GROUPING : GROUPING);
+}
+
+
+bool
+__grouping_iterator_init (struct grouping_iterator *it,
+ int category, locale_t loc, size_t digits)
+{
+ if (digits <= 1)
+ return __grouping_iterator_init_none (it, digits);
+ else
+ return grouping_iterator_setup (it, digits, get_grouping (category, loc));
+}
+
+bool
+__grouping_iterator_next (struct grouping_iterator *it)
+{
+ assert (it->remaining > 0);
+ --it->remaining;
+
+ if (it->remaining_in_current_group > 0)
+ {
+ --it->remaining_in_current_group;
+ return false;
+ }
+
+ /* If we are in the non-repeating part, switch group. */
+ if (it->remaining < it->non_repeating_groups)
+ --it->groupings;
+
+ it->remaining_in_current_group = *it->groupings - 1;
+ return true;
+}
diff --git a/stdio-common/grouping_iterator.h b/stdio-common/grouping_iterator.h
new file mode 100644
index 0000000000..ca41a7fdc1
--- /dev/null
+++ b/stdio-common/grouping_iterator.h
@@ -0,0 +1,65 @@
+/* Iterator for grouping a number while scanning it forward.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef GROUPING_ITERATOR_H
+#define GROUPING_ITERATOR_H
+
+#include <locale.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+struct grouping_iterator
+{
+ /* Number of characters in the current group. If this reaches zero,
+ a thousands separator needs to be emittted. */
+ size_t remaining_in_current_group;
+
+ /* Number of characters remaining in the number. This is used to
+ detect the start of the non-repeating groups. */
+ size_t remaining;
+
+ /* Points to the current grouping descriptor. */
+ const char *groupings;
+
+ /* Total number of characters in the non-repeating groups. */
+ size_t non_repeating_groups;
+
+ /* Number of separators that will be inserted if the whole number is
+ processed. (Does not change during iteration.) */
+ size_t separators;
+};
+
+struct __locale_data;
+
+/* Initializes *IT with the data from LOCDATA (which must be for
+ LC_MONETARY or LC_NUMERIC). DIGITS is the length of the number.
+ Returns true if grouping is active, false if not. */
+bool __grouping_iterator_init (struct grouping_iterator *it,
+ int category, locale_t loc,
+ size_t digits) attribute_hidden;
+
+/* Initializes *IT with no grouping information for a string of length
+ DIGITS, and return false to indicate no grouping. */
+bool __grouping_iterator_init_none (struct grouping_iterator *it, size_t digits)
+ attribute_hidden;
+
+/* Advances to the next character and returns true if a thousands
+ separator should be inserted before emitting it. */
+bool __grouping_iterator_next (struct grouping_iterator *it);
+
+#endif /* GROUPING_ITERATOR_H */
diff --git a/stdio-common/tst-grouping_iterator.c b/stdio-common/tst-grouping_iterator.c
new file mode 100644
index 0000000000..97d8f40628
--- /dev/null
+++ b/stdio-common/tst-grouping_iterator.c
@@ -0,0 +1,262 @@
+/* Test for struct grouping_iterator.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* Rebuild the fail to access internal-only functions. */
+#include <grouping_iterator.c>
+
+#include <stdio.h>
+#include <support/check.h>
+#include <support/support.h>
+#include <support/test-driver.h>
+
+static void
+check (int lineno, const char *groupings,
+ const char *input, const char *expected)
+{
+ if (test_verbose)
+ {
+ printf ("info: %s:%d: \"%s\" via \"", __FILE__, lineno, input);
+ for (const char *p = groupings; *p != 0; ++p)
+ printf ("\\%o", *p & 0xff);
+ printf ("\" to \"%s\"\n", expected);
+ }
+
+ size_t initial_group = strchrnul (expected, '\'') - expected;
+ size_t separators = 0;
+ for (const char *p = expected; *p != '\0'; ++p)
+ separators += *p == '\'';
+
+ size_t digits = strlen (input);
+ char *out = xmalloc (2 * digits + 1);
+
+ struct grouping_iterator it;
+ TEST_COMPARE (grouping_iterator_setup (&it, digits, groupings),
+ strchr (expected, '\'') != NULL);
+ TEST_COMPARE (it.remaining, digits);
+ TEST_COMPARE (it.remaining_in_current_group, initial_group);
+ TEST_COMPARE (it.separators, separators);
+
+ char *p = out;
+ while (*input != '\0')
+ {
+ if (__grouping_iterator_next (&it))
+ *p++ = '\'';
+ TEST_COMPARE (it.separators, separators);
+ *p++ = *input++;
+ }
+ *p++ = '\0';
+
+ TEST_COMPARE (it.remaining, 0);
+ TEST_COMPARE (it.remaining_in_current_group, 0);
+
+ TEST_COMPARE_STRING (out, expected);
+
+ free (out);
+}
+
+static int
+do_test (void)
+{
+ check (__LINE__, "", "1", "1");
+ check (__LINE__, "", "12", "12");
+ check (__LINE__, "", "123", "123");
+ check (__LINE__, "", "1234", "1234");
+
+ check (__LINE__, "\3", "1", "1");
+ check (__LINE__, "\3", "12", "12");
+ check (__LINE__, "\3", "123", "123");
+ check (__LINE__, "\3", "1234", "1'234");
+ check (__LINE__, "\3", "12345", "12'345");
+ check (__LINE__, "\3", "123456", "123'456");
+ check (__LINE__, "\3", "1234567", "1'234'567");
+ check (__LINE__, "\3", "12345678", "12'345'678");
+ check (__LINE__, "\3", "123456789", "123'456'789");
+ check (__LINE__, "\3", "1234567890", "1'234'567'890");
+
+ check (__LINE__, "\2\3", "1", "1");
+ check (__LINE__, "\2\3", "12", "12");
+ check (__LINE__, "\2\3", "123", "1'23");
+ check (__LINE__, "\2\3", "1234", "12'34");
+ check (__LINE__, "\2\3", "12345", "123'45");
+ check (__LINE__, "\2\3", "123456", "1'234'56");
+ check (__LINE__, "\2\3", "1234567", "12'345'67");
+ check (__LINE__, "\2\3", "12345678", "123'456'78");
+ check (__LINE__, "\2\3", "123456789", "1'234'567'89");
+ check (__LINE__, "\2\3", "1234567890", "12'345'678'90");
+
+ check (__LINE__, "\3\2", "1", "1");
+ check (__LINE__, "\3\2", "12", "12");
+ check (__LINE__, "\3\2", "123", "123");
+ check (__LINE__, "\3\2", "1234", "1'234");
+ check (__LINE__, "\3\2", "12345", "12'345");
+ check (__LINE__, "\3\2", "123456", "1'23'456");
+ check (__LINE__, "\3\2", "1234567", "12'34'567");
+ check (__LINE__, "\3\2", "12345678", "1'23'45'678");
+ check (__LINE__, "\3\2", "123456789", "12'34'56'789");
+ check (__LINE__, "\3\2", "1234567890", "1'23'45'67'890");
+
+ check (__LINE__, "\3\2\1", "1", "1");
+ check (__LINE__, "\3\2\1", "12", "12");
+ check (__LINE__, "\3\2\1", "123", "123");
+ check (__LINE__, "\3\2\1", "1234", "1'234");
+ check (__LINE__, "\3\2\1", "12345", "12'345");
+ check (__LINE__, "\3\2\1", "123456", "1'23'456");
+ check (__LINE__, "\3\2\1", "1234567", "1'2'34'567");
+ check (__LINE__, "\3\2\1", "12345678", "1'2'3'45'678");
+ check (__LINE__, "\3\2\1", "123456789", "1'2'3'4'56'789");
+ check (__LINE__, "\3\2\1", "1234567890", "1'2'3'4'5'67'890");
+
+ check (__LINE__, "\2\3\1", "1", "1");
+ check (__LINE__, "\2\3\1", "12", "12");
+ check (__LINE__, "\2\3\1", "123", "1'23");
+ check (__LINE__, "\2\3\1", "1234", "12'34");
+ check (__LINE__, "\2\3\1", "12345", "123'45");
+ check (__LINE__, "\2\3\1", "123456", "1'234'56");
+ check (__LINE__, "\2\3\1", "1234567", "1'2'345'67");
+ check (__LINE__, "\2\3\1", "12345678", "1'2'3'456'78");
+ check (__LINE__, "\2\3\1", "123456789", "1'2'3'4'567'89");
+ check (__LINE__, "\2\3\1", "1234567890", "1'2'3'4'5'678'90");
+
+ /* No repeats. */
+ check (__LINE__, "\3\377", "1", "1");
+ check (__LINE__, "\3\377", "12", "12");
+ check (__LINE__, "\3\377", "123", "123");
+ check (__LINE__, "\3\377", "1234", "1'234");
+ check (__LINE__, "\3\377", "12345", "12'345");
+ check (__LINE__, "\3\377", "123456", "123'456");
+ check (__LINE__, "\3\377", "1234567", "1234'567");
+ check (__LINE__, "\3\377", "12345678", "12345'678");
+
+ check (__LINE__, "\2\3\377", "1", "1");
+ check (__LINE__, "\2\3\377", "12", "12");
+ check (__LINE__, "\2\3\377", "123", "1'23");
+ check (__LINE__, "\2\3\377", "1234", "12'34");
+ check (__LINE__, "\2\3\377", "12345", "123'45");
+ check (__LINE__, "\2\3\377", "123456", "1'234'56");
+ check (__LINE__, "\2\3\377", "1234567", "12'345'67");
+ check (__LINE__, "\2\3\377", "12345678", "123'456'78");
+ check (__LINE__, "\2\3\377", "123456789", "1234'567'89");
+ check (__LINE__, "\2\3\377", "1234567890", "12345'678'90");
+
+ check (__LINE__, "\3\2\377", "1", "1");
+ check (__LINE__, "\3\2\377", "12", "12");
+ check (__LINE__, "\3\2\377", "123", "123");
+ check (__LINE__, "\3\2\377", "1234", "1'234");
+ check (__LINE__, "\3\2\377", "12345", "12'345");
+ check (__LINE__, "\3\2\377", "123456", "1'23'456");
+ check (__LINE__, "\3\2\377", "1234567", "12'34'567");
+ check (__LINE__, "\3\2\377", "12345678", "123'45'678");
+ check (__LINE__, "\3\2\377", "123456789", "1234'56'789");
+ check (__LINE__, "\3\2\377", "1234567890", "12345'67'890");
+
+ /* Locale-based tests. */
+
+ locale_t loc;
+ struct lc_ctype_data *ctype;
+ struct grouping_iterator it;
+
+ loc = newlocale (LC_ALL_MASK, "de_DE.UTF-8", 0);
+ TEST_VERIFY_EXIT (loc != 0);
+ ctype = loc->__locales[LC_CTYPE]->private;
+ TEST_VERIFY (!ctype->outdigit_translation_needed);
+ for (int i = 0; i <= 9; ++i)
+ TEST_COMPARE (ctype->outdigit_bytes[i], 1);
+ TEST_COMPARE (ctype->outdigit_bytes_all_equal, 1);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 2);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 3);
+ TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
+ TEST_COMPARE (it.separators, 2);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 2);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 3);
+ TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
+ TEST_COMPARE (it.separators, 2);
+ freelocale (loc);
+
+ loc = newlocale (LC_ALL_MASK, "tg_TJ.UTF-8", 0);
+ TEST_VERIFY_EXIT (loc != 0);
+ ctype = loc->__locales[LC_CTYPE]->private;
+ TEST_VERIFY (!ctype->outdigit_translation_needed);
+ for (int i = 0; i <= 9; ++i)
+ TEST_COMPARE (ctype->outdigit_bytes[i], 1);
+ TEST_COMPARE (ctype->outdigit_bytes_all_equal, 1);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 2);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 3);
+ TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
+ TEST_COMPARE (it.separators, 2);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 2);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 3);
+ TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
+ TEST_COMPARE (it.separators, 2);
+ freelocale (loc);
+
+ loc = newlocale (LC_ALL_MASK, "hi_IN.UTF-8", 0);
+ TEST_VERIFY_EXIT (loc != 0);
+ ctype = loc->__locales[LC_CTYPE]->private;
+ TEST_VERIFY (ctype->outdigit_translation_needed);
+ for (int i = 0; i <= 9; ++i)
+ /* Locale uses Devanagari digits. */
+ TEST_COMPARE (ctype->outdigit_bytes[i], 3);
+ TEST_COMPARE (ctype->outdigit_bytes_all_equal, 3);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 2);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 3);
+ TEST_COMPARE (it.non_repeating_groups, 0);
+ TEST_COMPARE (it.separators, 2);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 1);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 2);
+ TEST_COMPARE (it.non_repeating_groups, 3);
+ TEST_COMPARE (it.separators, 3);
+ freelocale (loc);
+
+ loc = newlocale (LC_ALL_MASK, "ps_AF.UTF-8", 0);
+ TEST_VERIFY_EXIT (loc != 0);
+ ctype = loc->__locales[LC_CTYPE]->private;
+ TEST_VERIFY (ctype->outdigit_translation_needed);
+ for (int i = 0; i <= 9; ++i)
+ /* Locale uses non-ASCII digits. */
+ TEST_COMPARE (ctype->outdigit_bytes[i], 2);
+ TEST_COMPARE (ctype->outdigit_bytes_all_equal, 2);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 2);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 3);
+ TEST_COMPARE (it.non_repeating_groups, 0);
+ TEST_COMPARE (it.separators, 2);
+ TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
+ TEST_COMPARE (it.remaining_in_current_group, 2);
+ TEST_COMPARE (it.remaining, 8);
+ TEST_COMPARE (*it.groupings, 3);
+ TEST_COMPARE (it.non_repeating_groups, 0);
+ TEST_COMPARE (it.separators, 2);
+ freelocale (loc);
+
+ return 0;
+}
+
+#include <support/test-driver.c>
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (3 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 04/14] locale: Implement struct grouping_iterator Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-06-02 17:16 ` Adhemerval Zanella
` (2 more replies)
2022-05-23 14:07 ` [PATCH v2 06/14] stdio-common: Add __printf_function_invoke Florian Weimer
` (8 subsequent siblings)
13 siblings, 3 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
These buffers will eventually be used instead of FILE * objects
to implement printf functions. The multibyte buffer is struct
__printf_buffer, the wide buffer is struct __wprintf_buffer.
To enable writing type-generic code, the header files
printf_buffer-char.h and printf_buffer-wchar_t.h define the
Xprintf macro differently, enabling Xprintf (buffer) to stand
for __printf_buffer and __wprintf_buffer as appropriate. For
common cases, macros like Xprintf_buffer are provided as a more
syntactically convenient shortcut.
Buffer-specific flush callbacks are implemented with a switch
statement instead of a function pointer, to avoid hardening issues
similar to those of libio vtables. struct __printf_buffer_as_file
is needed to support custom printf specifiers because the public
interface for that requires passing a FILE *, which is why there
is a trapdoor back from these buffers to FILE * streams.
Since the immediate user of these interfaces knows when processing
has finished, there is no flush callback for the end of processing,
only a flush callback for the intermediate buffer flush.
---
include/printf_buffer.h | 281 ++++++++++++++++++++++++++
stdio-common/Makefile | 16 ++
stdio-common/Xprintf_buffer_done.c | 40 ++++
stdio-common/Xprintf_buffer_flush.c | 72 +++++++
stdio-common/Xprintf_buffer_pad_1.c | 44 ++++
stdio-common/Xprintf_buffer_putc_1.c | 29 +++
stdio-common/Xprintf_buffer_puts_1.c | 37 ++++
stdio-common/Xprintf_buffer_write.c | 43 ++++
stdio-common/printf_buffer-char.h | 24 +++
stdio-common/printf_buffer-wchar_t.h | 24 +++
stdio-common/printf_buffer_as_file.c | 148 ++++++++++++++
stdio-common/printf_buffer_as_file.h | 87 ++++++++
stdio-common/printf_buffer_done.c | 21 ++
stdio-common/printf_buffer_flush.c | 42 ++++
stdio-common/printf_buffer_pad_1.c | 21 ++
stdio-common/printf_buffer_putc_1.c | 21 ++
stdio-common/printf_buffer_puts_1.c | 21 ++
stdio-common/printf_buffer_to_file.c | 122 +++++++++++
stdio-common/printf_buffer_to_file.h | 57 ++++++
stdio-common/printf_buffer_write.c | 21 ++
stdio-common/wprintf_buffer_as_file.c | 153 ++++++++++++++
stdio-common/wprintf_buffer_done.c | 21 ++
stdio-common/wprintf_buffer_flush.c | 36 ++++
stdio-common/wprintf_buffer_pad_1.c | 21 ++
stdio-common/wprintf_buffer_putc_1.c | 21 ++
stdio-common/wprintf_buffer_puts_1.c | 21 ++
stdio-common/wprintf_buffer_to_file.c | 55 +++++
stdio-common/wprintf_buffer_write.c | 21 ++
28 files changed, 1520 insertions(+)
create mode 100644 include/printf_buffer.h
create mode 100644 stdio-common/Xprintf_buffer_done.c
create mode 100644 stdio-common/Xprintf_buffer_flush.c
create mode 100644 stdio-common/Xprintf_buffer_pad_1.c
create mode 100644 stdio-common/Xprintf_buffer_putc_1.c
create mode 100644 stdio-common/Xprintf_buffer_puts_1.c
create mode 100644 stdio-common/Xprintf_buffer_write.c
create mode 100644 stdio-common/printf_buffer-char.h
create mode 100644 stdio-common/printf_buffer-wchar_t.h
create mode 100644 stdio-common/printf_buffer_as_file.c
create mode 100644 stdio-common/printf_buffer_as_file.h
create mode 100644 stdio-common/printf_buffer_done.c
create mode 100644 stdio-common/printf_buffer_flush.c
create mode 100644 stdio-common/printf_buffer_pad_1.c
create mode 100644 stdio-common/printf_buffer_putc_1.c
create mode 100644 stdio-common/printf_buffer_puts_1.c
create mode 100644 stdio-common/printf_buffer_to_file.c
create mode 100644 stdio-common/printf_buffer_to_file.h
create mode 100644 stdio-common/printf_buffer_write.c
create mode 100644 stdio-common/wprintf_buffer_as_file.c
create mode 100644 stdio-common/wprintf_buffer_done.c
create mode 100644 stdio-common/wprintf_buffer_flush.c
create mode 100644 stdio-common/wprintf_buffer_pad_1.c
create mode 100644 stdio-common/wprintf_buffer_putc_1.c
create mode 100644 stdio-common/wprintf_buffer_puts_1.c
create mode 100644 stdio-common/wprintf_buffer_to_file.c
create mode 100644 stdio-common/wprintf_buffer_write.c
diff --git a/include/printf_buffer.h b/include/printf_buffer.h
new file mode 100644
index 0000000000..6be7723869
--- /dev/null
+++ b/include/printf_buffer.h
@@ -0,0 +1,281 @@
+/* Multibyte and wide buffers for implementing printf-related functions.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* The naming of the multibyte and wide variants is intentionally
+ consistent, so that it is possible to use the Xprintf macro in
+ stdio-common/printf_buffer-char.h and
+ stdio-common/printf_buffer-wchar_t.h to select between them in
+ type-generic code. */
+
+#ifndef PRINTF_BUFFER_H
+#define PRINTF_BUFFER_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <wchar.h>
+
+/* <printf_buffer_as_file.h> introduces a way to use struct
+ __printf_buffer objects from FILE * streams. To avoid storing a
+ function pointer (or vtable pointer) in struct __printf_buffer
+ (which would defeat libio vtable hardening), a switch statement
+ over the different flush implementations is used to implement
+ __printf_buffer_flush.
+
+ __printf_buffer_mode_failed is special: it is the sticky failure
+ indicator. Unlike struct alloc_buffer, this is not folded into
+ write_ptr, so that snprintf and other string-writing functions can
+ discover the end of the string even in the error case, to be able
+ to add the null terminator. */
+enum __printf_buffer_mode
+ {
+ __printf_buffer_mode_failed,
+ __printf_buffer_mode_to_file,
+ };
+
+/* Buffer for fast character writing with overflow handling.
+ Typically embedded in another struct with further data that is used
+ by the flush function. */
+struct __printf_buffer
+{
+ /* These pointer members follow FILE streams. write_ptr and
+ write_end must be initialized to cover the target buffer. See
+ __printf_buffer_init.
+
+ Data can be written directly to *write_ptr while write_ptr !=
+ write_end, and write_ptr can be advanced accordingly. Note that
+ is not possible to use the apparently-unused part of the buffer
+ as scratch space because sprintf (and snprintf, but that is a bit
+ iffy) must only write the minimum number of characters produced
+ by the format string and its arguments.
+
+ write_base must be initialized to be equal to write_ptr. The
+ framework uses this pointer to compute the total number of
+ written bytes, together with the written field. See
+ __printf_buffer_done.
+
+ write_base and write_end are only read by the generic functions
+ after initialization, only the flush implementation called from
+ __printf_buffer_flush might change these pointers. See the
+ comment on Xprintf (buffer_do_flush) in Xprintf_buffer_flush.c
+ for details regarding the flush operation. */
+ char *write_base;
+ char *write_ptr;
+ char *write_end;
+
+ /* Number of characters written so far (excluding the current
+ buffer). Potentially updated on flush. The actual number of
+ written bytes also inclused the unflushed-but-written buffer
+ part, write_ptr - write_base. A 64-bit value is used to avoid
+ the need for overflow checks. */
+ uint64_t written;
+
+ /* Identifies the flush callback. */
+ enum __printf_buffer_mode mode;
+};
+
+/* Marks the buffer as failed, so that __printf_buffer_has_failed
+ returns true and future flush operations are no-ops. */
+static inline void
+__printf_buffer_mark_failed (struct __printf_buffer *buf)
+{
+ buf->mode = __printf_buffer_mode_failed;
+}
+
+/* Returns true if the sticky error indicator of the buffer has been
+ set to failed. */
+static inline bool __attribute_warn_unused_result__
+__printf_buffer_has_failed (struct __printf_buffer *buf)
+{
+ return buf->mode == __printf_buffer_mode_failed;
+}
+
+/* Initialization of a buffer, using the memory region from [BASE, BASE +LEN)
+ as the initial buffer contents. LEN can be zero. */
+static inline void
+__printf_buffer_init (struct __printf_buffer *buf, char *base, size_t len,
+ enum __printf_buffer_mode mode)
+{
+ buf->write_base = base;
+ buf->write_ptr = base;
+ buf->write_end = base + len;
+ buf->written = 0;
+ buf->mode = mode;
+}
+
+/* Called by printf_buffer_putc for a full buffer. */
+void __printf_buffer_putc_1 (struct __printf_buffer *buf, char ch)
+ attribute_hidden;
+
+/* Writes CH to BUF. */
+static inline void
+__printf_buffer_putc (struct __printf_buffer *buf, char ch)
+{
+ if (buf->write_ptr != buf->write_end)
+ *buf->write_ptr++ = ch;
+ else
+ __printf_buffer_putc_1 (buf, ch);
+}
+
+/* Writes COUNT repeats of CH to BUF. */
+void __printf_buffer_pad_1 (struct __printf_buffer *buf,
+ char ch, size_t count) attribute_hidden;
+
+/* __printf_buffer_pad with fast path for no padding. COUNT is a
+ long int, to accomodate signed uses in printf and elsewhere. */
+static inline void
+__printf_buffer_pad (struct __printf_buffer *buf, char ch, long int count)
+{
+ if (count > 0)
+ __printf_buffer_pad_1 (buf, ch, count);
+}
+
+/* Write COUNT bytes starting at S to BUF. S must not overlap with
+ the internal buffer. */
+void __printf_buffer_write (struct __printf_buffer *buf, const char *s,
+ size_t count) attribute_hidden;
+
+/* Write S to BUF. S must not overlap with the internal buffer. */
+void __printf_buffer_puts_1 (struct __printf_buffer *buf, const char *s)
+ attribute_hidden;
+static inline void
+__printf_buffer_puts (struct __printf_buffer *buf, const char *s)
+{
+ if (__builtin_constant_p (__builtin_strlen (s)))
+ __printf_buffer_write (buf, s, __builtin_strlen (s));
+ else
+ __printf_buffer_puts_1 (buf, s);
+}
+
+/* Returns the number of bytes written through the buffer, or -1 if
+ there was an error (that is, __printf_buffer_has_failed (BUF) is true).
+
+ The number of written bytes includes pending bytes in the buffer
+ (between BUF->write_base and BUF->write_ptr).
+
+ If the number is larger than INT_MAX, returns -1 and sets errno to
+ EOVERFLOW. This function does not flush the buffer. If the caller
+ needs the side effect of flushing, it has to do this
+ separately. */
+int __printf_buffer_done (struct __printf_buffer *buf) attribute_hidden;
+
+/* Internally used to call the flush function. This can be called
+ explicitly for certain modes to flush the buffer prematuraly. In
+ such cases, it is often the case that the buffer mode is statically
+ known, and the flush implementation can be called directly. */
+bool __printf_buffer_flush (struct __printf_buffer *buf) attribute_hidden;
+
+/* Wide version of struct __printf_buffer follows. */
+
+enum __wprintf_buffer_mode
+ {
+ __wprintf_buffer_mode_failed,
+ __wprintf_buffer_mode_to_file,
+ };
+
+struct __wprintf_buffer
+{
+ wchar_t *write_base;
+ wchar_t *write_ptr;
+ wchar_t *write_end;
+ uint64_t written;
+ enum __wprintf_buffer_mode mode;
+};
+
+static inline void
+__wprintf_buffer_mark_failed (struct __wprintf_buffer *buf)
+{
+ buf->mode = __wprintf_buffer_mode_failed;
+}
+
+static inline bool __attribute_warn_unused_result__
+__wprintf_buffer_has_failed (struct __wprintf_buffer *buf)
+{
+ return buf->mode == __wprintf_buffer_mode_failed;
+}
+
+static inline void
+__wprintf_buffer_init (struct __wprintf_buffer *buf,
+ wchar_t *base, size_t len,
+ enum __wprintf_buffer_mode mode)
+{
+ buf->write_base = base;
+ buf->write_ptr = base;
+ buf->write_end = base + len;
+ buf->written = 0;
+ buf->mode = mode;
+}
+
+void __wprintf_buffer_putc_1 (struct __wprintf_buffer *buf, wchar_t ch)
+ attribute_hidden;
+
+static inline void
+__wprintf_buffer_putc (struct __wprintf_buffer *buf, wchar_t ch)
+{
+ if (buf->write_ptr != buf->write_end)
+ *buf->write_ptr++ = ch;
+ else
+ __wprintf_buffer_putc_1 (buf, ch);
+}
+
+void __wprintf_buffer_pad_1 (struct __wprintf_buffer *buf,
+ wchar_t ch, size_t count) attribute_hidden;
+
+static inline void
+__wprintf_buffer_pad (struct __wprintf_buffer *buf, char ch, long int count)
+{
+ if (count > 0)
+ __wprintf_buffer_pad_1 (buf, ch, count);
+}
+
+void __wprintf_buffer_write (struct __wprintf_buffer *buf, const wchar_t *s,
+ size_t count) attribute_hidden;
+
+void __wprintf_buffer_puts (struct __wprintf_buffer *buf, const wchar_t *s)
+ attribute_hidden;
+
+int __wprintf_buffer_done (struct __wprintf_buffer *buf) attribute_hidden;
+
+bool __wprintf_buffer_flush (struct __wprintf_buffer *buf) attribute_hidden;
+
+/* Type-generic convenience macros. They are useful if
+ printf_buffer-char.h or printf_buffer-wchar_t.h is included as
+ well. */
+
+#define Xprintf_buffer Xprintf (buffer)
+#define Xprintf_buffer_done Xprintf (buffer_done)
+#define Xprintf_buffer_flush Xprintf (buffer_flush)
+#define Xprintf_buffer_has_failed Xprintf (buffer_has_failed)
+#define Xprintf_buffer_mark_failed Xprintf (buffer_mark_failed)
+#define Xprintf_buffer_pad Xprintf (buffer_pad)
+#define Xprintf_buffer_putc Xprintf (buffer_putc)
+#define Xprintf_buffer_puts Xprintf (buffer_puts)
+#define Xprintf_buffer_write Xprintf (buffer_write)
+
+/* Flush function implementations follow. They are called from
+ __printf_buffer_flush. Generic code should not call these flush
+ functions directly. Some modes have inline implementations. */
+
+struct __printf_buffer_to_file;
+void __printf_buffer_flush_to_file (struct __printf_buffer_to_file *)
+ attribute_hidden;
+
+struct __wprintf_buffer_to_file;
+void __wprintf_buffer_flush_to_file (struct __wprintf_buffer_to_file *)
+ attribute_hidden;
+
+#endif /* PRINTF_BUFFER_H */
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index da3a3bc0c9..5ba381fe41 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -53,6 +53,14 @@ routines := \
perror \
printf \
printf-prs \
+ printf_buffer_as_file \
+ printf_buffer_done \
+ printf_buffer_flush \
+ printf_buffer_pad_1 \
+ printf_buffer_putc_1 \
+ printf_buffer_puts_1 \
+ printf_buffer_to_file \
+ printf_buffer_write \
printf_fp \
printf_fphex \
printf_size \
@@ -85,6 +93,14 @@ routines := \
vfwscanf \
vfwscanf-internal \
vprintf \
+ wprintf_buffer_as_file \
+ wprintf_buffer_done \
+ wprintf_buffer_flush \
+ wprintf_buffer_pad_1 \
+ wprintf_buffer_putc_1 \
+ wprintf_buffer_puts_1 \
+ wprintf_buffer_to_file \
+ wprintf_buffer_write \
# routines
aux := \
diff --git a/stdio-common/Xprintf_buffer_done.c b/stdio-common/Xprintf_buffer_done.c
new file mode 100644
index 0000000000..c7551979af
--- /dev/null
+++ b/stdio-common/Xprintf_buffer_done.c
@@ -0,0 +1,40 @@
+/* Final status reporting for struct __*printf_buffer. Generic version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <limits.h>
+#include <stdint.h>
+
+int
+Xprintf_buffer_done (struct Xprintf_buffer *buf)
+{
+ if (Xprintf_buffer_has_failed (buf))
+ return -1;
+
+ /* Use uintptr_t to deal with ptrdiff_t overflows (to some degree). */
+ uintptr_t written_current = buf->write_ptr - buf->write_base;
+ unsigned int written_total;
+ if (__builtin_add_overflow (buf->written, written_current, &written_total)
+ || buf->written > INT_MAX)
+ {
+ __set_errno (EOVERFLOW);
+ return -1;
+ }
+ else
+ return written_total;
+}
diff --git a/stdio-common/Xprintf_buffer_flush.c b/stdio-common/Xprintf_buffer_flush.c
new file mode 100644
index 0000000000..1368cfe684
--- /dev/null
+++ b/stdio-common/Xprintf_buffer_flush.c
@@ -0,0 +1,72 @@
+/* Flush wrapper for struct __*printf_buffer. Generic version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+
+#include <assert.h>
+#include <stdint.h>
+
+/* Xprintf (buffer_do_flush) (BUF) performs the flush operation. The
+ actual implementation is specific to the multibyte and wide
+ variants.
+
+ If the flush fails, Xprintf_buffer_mark_failed (BUF) must be
+ called, and BUF->write_ptr and BUF->write_end can be left
+ unchanged.
+
+ The function must not do anything if failure has already occurred,
+ that is, if BUF->mode == Xprintf (buffer_mode_failed).
+
+ The framework implicitly invokes flush with BUF->write_ptr ==
+ BUF->write_end only. (This is particularly relevant to the
+ __sprintf_chk flush, which just calls __chk_fail.) But in some
+ cases, Xprintf_buffer_flush may be called explicitly (when
+ BUF->mode/the backing function is known). In that case, it is
+ possible that BUF->write_ptr < BUF->write_end is true.
+
+ If the flush succeeds, the pointers are changed so that
+ BUF->write_ptr < BUF->write_end. It is possible to switch to a
+ completely different buffer here. If the buffer is moved, it may
+ be necessary to updated BUF->write_base and BUF->written from the
+ flush function as well.
+
+ Note that when chaining buffers, in the flush function for the
+ outer buffer (to which data is written first), it is necessary to
+ check for BUF->next->failed (for the inner buffer) and set
+ BUF->base.failed to true (for the outer buffer). This should come
+ towards the end of the outer flush function. Usually, there is
+ also some unwrapping step afterwards; it has to check the outer
+ buffer (BUF->base.failed) and propagate any error to the inner
+ buffer (BUF->next->failed), so essentially in the other
+ direction. */
+static void Xprintf (buffer_do_flush) (struct Xprintf_buffer *buf);
+
+bool
+Xprintf_buffer_flush (struct Xprintf_buffer *buf)
+{
+ if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
+ return false;
+
+ Xprintf (buffer_do_flush) (buf);
+ if (Xprintf_buffer_has_failed (buf))
+ return false;
+
+ /* Ensure that the flush has made available some bytes. */
+ assert (buf->write_ptr != buf->write_end);
+ return true;
+}
diff --git a/stdio-common/Xprintf_buffer_pad_1.c b/stdio-common/Xprintf_buffer_pad_1.c
new file mode 100644
index 0000000000..2be8270ad2
--- /dev/null
+++ b/stdio-common/Xprintf_buffer_pad_1.c
@@ -0,0 +1,44 @@
+/* Write repeated characters to struct __*printf_buffer. Generic version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <assert.h>
+#include <string.h>
+
+void
+Xprintf (buffer_pad_1) (struct Xprintf_buffer *buf, CHAR_T ch, size_t count)
+{
+ if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
+ return;
+
+ do
+ {
+ /* Proactively make room. __*printf_buffer_pad has already
+ checked for a zero-length write, so this function is only
+ called when there is actually data to write. */
+ if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
+ return;
+ assert (buf->write_ptr != buf->write_end);
+ size_t to_fill = buf->write_end - buf->write_ptr;
+ if (to_fill > count)
+ to_fill = count;
+ MEMSET (buf->write_ptr, ch, to_fill);
+ buf->write_ptr += to_fill;
+ count -= to_fill;
+ }
+ while (count > 0);
+}
diff --git a/stdio-common/Xprintf_buffer_putc_1.c b/stdio-common/Xprintf_buffer_putc_1.c
new file mode 100644
index 0000000000..3458775a1c
--- /dev/null
+++ b/stdio-common/Xprintf_buffer_putc_1.c
@@ -0,0 +1,29 @@
+/* Overflow write function for struct __*printf_buffer. Generic version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <assert.h>
+
+void
+Xprintf (buffer_putc_1) (struct Xprintf_buffer *buf, CHAR_T ch)
+{
+ if (__glibc_unlikely (Xprintf_buffer_has_failed (buf))
+ || !Xprintf_buffer_flush (buf))
+ return;
+ assert (buf->write_ptr < buf->write_end);
+ *buf->write_ptr++ = ch;
+}
diff --git a/stdio-common/Xprintf_buffer_puts_1.c b/stdio-common/Xprintf_buffer_puts_1.c
new file mode 100644
index 0000000000..d8ee7ef47e
--- /dev/null
+++ b/stdio-common/Xprintf_buffer_puts_1.c
@@ -0,0 +1,37 @@
+/* String write function for struct __*printf_buffer. Generic version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <assert.h>
+#include <string.h>
+
+void
+Xprintf (buffer_puts_1) (struct Xprintf_buffer *buf, const CHAR_T *s)
+{
+ if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
+ return;
+
+ while (*s != 0)
+ {
+ if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
+ return;
+ assert (buf->write_ptr != buf->write_end);
+ size_t to_copy = STRNLEN (s, buf->write_end - buf->write_ptr);
+ buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
+ s += to_copy;
+ }
+}
diff --git a/stdio-common/Xprintf_buffer_write.c b/stdio-common/Xprintf_buffer_write.c
new file mode 100644
index 0000000000..fc6ad5fdd1
--- /dev/null
+++ b/stdio-common/Xprintf_buffer_write.c
@@ -0,0 +1,43 @@
+/* Blob write function for struct __*printf_buffer. Generic version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+
+#include <assert.h>
+#include <string.h>
+
+void
+Xprintf_buffer_write (struct Xprintf_buffer *buf,
+ const CHAR_T *s, size_t count)
+{
+ if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
+ return;
+
+ while (count > 0)
+ {
+ if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
+ return;
+ assert (buf->write_ptr != buf->write_end);
+ size_t to_copy = buf->write_end - buf->write_ptr;
+ if (to_copy > count)
+ to_copy = count;
+ buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
+ s += to_copy;
+ count -= to_copy;
+ }
+}
diff --git a/stdio-common/printf_buffer-char.h b/stdio-common/printf_buffer-char.h
new file mode 100644
index 0000000000..88eb326a45
--- /dev/null
+++ b/stdio-common/printf_buffer-char.h
@@ -0,0 +1,24 @@
+/* Macros for the multibyte (char) implementation of struct __printf_buffer.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define Xprintf(n) __printf_##n
+
+#define CHAR_T char
+#define MEMPCPY __mempcpy
+#define MEMSET memset
+#define STRNLEN __strnlen
diff --git a/stdio-common/printf_buffer-wchar_t.h b/stdio-common/printf_buffer-wchar_t.h
new file mode 100644
index 0000000000..7597dc2eab
--- /dev/null
+++ b/stdio-common/printf_buffer-wchar_t.h
@@ -0,0 +1,24 @@
+/* Macros for wide (wchar_t) implementation of struct __wprintf_buffer.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define Xprintf(n) __wprintf_##n
+
+#define CHAR_T wchar_t
+#define MEMPCPY __wmempcpy
+#define MEMSET __wmemset
+#define STRNLEN __wcsnlen
diff --git a/stdio-common/printf_buffer_as_file.c b/stdio-common/printf_buffer_as_file.c
new file mode 100644
index 0000000000..f27b000d78
--- /dev/null
+++ b/stdio-common/printf_buffer_as_file.c
@@ -0,0 +1,148 @@
+/* FILE * interface to a struct __printf_buffer. Multibyte version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer_as_file.h>
+
+#include <assert.h>
+#include <printf_buffer.h>
+
+/* Commit the data directly written through the stdio stream. */
+static void
+__printf_buffer_as_file_commit (struct __printf_buffer_as_file *file)
+{
+ /* Check that the write pointers in the file stream are consistent
+ with the next buffer. */
+ assert (file->stream._IO_write_ptr >= file->next->write_ptr);
+ assert (file->stream._IO_write_ptr <= file->next->write_end);
+ assert (file->stream._IO_write_base == file->next->write_base);
+ assert (file->stream._IO_write_end == file->next->write_end);
+
+ file->next->write_ptr = file->stream._IO_write_ptr;
+}
+
+/* Pointer the FILE * write buffer into the active printf_buffer
+ area. */
+static void
+__printf_buffer_as_file_switch_to_buffer (struct __printf_buffer_as_file *file)
+{
+ file->stream._IO_write_base = file->next->write_base;
+ file->stream._IO_write_ptr = file->next->write_ptr;
+ file->stream._IO_write_end = file->next->write_end;
+}
+
+/* Only a small subset of the vtable functions is implemented here,
+ following _IO_obstack_jumps. */
+
+static int
+__printf_buffer_as_file_overflow (FILE *fp, int ch)
+{
+ struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
+
+ __printf_buffer_as_file_commit (file);
+
+ /* EOF means only a flush is requested. */
+ if (ch != EOF)
+ __printf_buffer_putc (file->next, ch);
+
+ /* Ensure that flushing actually produces room. */
+ if (!__printf_buffer_has_failed (file->next)
+ && file->next->write_ptr == file->next->write_end)
+ __printf_buffer_flush (file->next);
+
+ __printf_buffer_as_file_switch_to_buffer (file);
+
+ if (!__printf_buffer_has_failed (file->next))
+ return (unsigned char) ch;
+ else
+ return EOF;
+}
+
+static size_t
+__printf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
+{
+ struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
+
+ __printf_buffer_as_file_commit (file);
+
+ /* Copy the data. */
+ __printf_buffer_write (file->next, buf, len);
+
+ __printf_buffer_as_file_switch_to_buffer (file);
+
+ if (!__printf_buffer_has_failed (file->next))
+ return len;
+ else
+ /* We may actually have written something. But the stream is
+ corrupted in this case anyway, so try not to divine the write
+ count here. */
+ return 0;
+}
+
+static const struct _IO_jump_t _IO_printf_buffer_as_file_jumps libio_vtable =
+{
+ JUMP_INIT_DUMMY,
+ JUMP_INIT(finish, NULL),
+ JUMP_INIT(overflow, __printf_buffer_as_file_overflow),
+ JUMP_INIT(underflow, NULL),
+ JUMP_INIT(uflow, NULL),
+ JUMP_INIT(pbackfail, NULL),
+ JUMP_INIT(xsputn, __printf_buffer_as_file_xsputn),
+ JUMP_INIT(xsgetn, NULL),
+ JUMP_INIT(seekoff, NULL),
+ JUMP_INIT(seekpos, NULL),
+ JUMP_INIT(setbuf, NULL),
+ JUMP_INIT(sync, NULL),
+ JUMP_INIT(doallocate, NULL),
+ JUMP_INIT(read, NULL),
+ JUMP_INIT(write, NULL),
+ JUMP_INIT(seek, NULL),
+ JUMP_INIT(close, NULL),
+ JUMP_INIT(stat, NULL),
+ JUMP_INIT(showmanyc, NULL),
+ JUMP_INIT(imbue, NULL)
+};
+
+void
+__printf_buffer_as_file_init (struct __printf_buffer_as_file *file,
+ struct __printf_buffer *next)
+{
+ file->stream._lock = NULL;
+ _IO_no_init (&file->stream, _IO_USER_LOCK, -1, NULL, NULL);
+ file->vtable = &_IO_printf_buffer_as_file_jumps;
+
+ /* Set up the write buffer from the next buffer. */
+ file->next = next;
+ __printf_buffer_as_file_switch_to_buffer (file);
+
+ /* Mark the read area as inactive, by making all pointers equal. */
+ file->stream._IO_read_base = file->stream._IO_write_base;
+ file->stream._IO_read_ptr = file->stream._IO_write_base;
+ file->stream._IO_read_end = file->stream._IO_write_base;
+}
+
+bool
+__printf_buffer_as_file_terminate (struct __printf_buffer_as_file *file)
+{
+ if (file->stream._flags & _IO_ERR_SEEN)
+ return false;
+ else
+ {
+ __printf_buffer_as_file_commit (file);
+ return true;
+ }
+}
diff --git a/stdio-common/printf_buffer_as_file.h b/stdio-common/printf_buffer_as_file.h
new file mode 100644
index 0000000000..ab7fa44144
--- /dev/null
+++ b/stdio-common/printf_buffer_as_file.h
@@ -0,0 +1,87 @@
+/* FILE * interface to a struct __*printf_buffer.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* Registered printf format specifier callbacks produce data via a
+ FILE * stream. struct __printf_buffer_as_file enables vfprintf to
+ create a suitable stdio stream. Likewise struct
+ __wprintf_buffer_as_file for vfwprintf. */
+
+#ifndef PRINTF_BUFFER_AS_FILE_H
+#define PRINTF_BUFFER_AS_FILE_H
+
+#include <libio/libioP.h>
+
+struct __printf_buffer;
+
+struct __printf_buffer_as_file
+{
+ /* Interface to libio. */
+ FILE stream;
+ const struct _IO_jump_t *vtable;
+
+ /* Pointer to the underlying buffer. */
+ struct __printf_buffer *next;
+};
+
+/* Initialization *FP so that data written to its FILE * stream ends
+ up in NEXT. */
+void __printf_buffer_as_file_init (struct __printf_buffer_as_file *fp,
+ struct __printf_buffer *next)
+ attribute_hidden;
+
+/* Returns the FILE * that can be used to write data to the
+ buffer. */
+static inline FILE *
+__printf_buffer_as_file_get (struct __printf_buffer_as_file *file)
+{
+ return &file->stream;
+}
+
+/* Transfers all pending data from the FILE * to the underlying
+ buffer. Returns true if there have been no errors. */
+bool __printf_buffer_as_file_terminate (struct __printf_buffer_as_file *)
+ attribute_hidden;
+
+/* Wide variant follows. */
+
+struct __wprintf_buffer;
+struct __wprintf_buffer_as_file
+{
+ /* Interface to libio. */
+ FILE stream;
+ const struct _IO_jump_t *vtable;
+ struct _IO_wide_data wide_stream;
+
+ /* Pointer to the underlying buffer. */
+ struct __wprintf_buffer *next;
+};
+
+void __wprintf_buffer_as_file_init (struct __wprintf_buffer_as_file *fp,
+ struct __wprintf_buffer *next)
+ attribute_hidden;
+
+static inline FILE *
+__wprintf_buffer_as_file_get (struct __wprintf_buffer_as_file *file)
+{
+ return &file->stream;
+}
+
+bool __wprintf_buffer_as_file_terminate (struct __wprintf_buffer_as_file *)
+ attribute_hidden;
+
+#endif /* PRINTF_BUFFER_AS_FILE_H */
diff --git a/stdio-common/printf_buffer_done.c b/stdio-common/printf_buffer_done.c
new file mode 100644
index 0000000000..5f3df1daad
--- /dev/null
+++ b/stdio-common/printf_buffer_done.c
@@ -0,0 +1,21 @@
+/* Final status reporting for struct __printf_buffer. Multibyte version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-char.h"
+#include "Xprintf_buffer_done.c"
diff --git a/stdio-common/printf_buffer_flush.c b/stdio-common/printf_buffer_flush.c
new file mode 100644
index 0000000000..9b25c0fde5
--- /dev/null
+++ b/stdio-common/printf_buffer_flush.c
@@ -0,0 +1,42 @@
+/* Flush a struct __printf_buffer. Multibyte version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+
+#include "printf_buffer-char.h"
+#include "Xprintf_buffer_flush.c"
+
+/* The __printf_buffer_flush_* functions are defined together with
+ functions that are pulled in by strong references. */
+#ifndef SHARED
+# pragma weak __printf_buffer_flush_to_file
+#endif /* !SHARED */
+
+static void
+__printf_buffer_do_flush (struct __printf_buffer *buf)
+{
+ switch (buf->mode)
+ {
+ case __printf_buffer_mode_failed:
+ return;
+ case __printf_buffer_mode_to_file:
+ __printf_buffer_flush_to_file ((struct __printf_buffer_to_file *) buf);
+ return;
+ }
+ __builtin_trap ();
+}
diff --git a/stdio-common/printf_buffer_pad_1.c b/stdio-common/printf_buffer_pad_1.c
new file mode 100644
index 0000000000..c4b9a7af56
--- /dev/null
+++ b/stdio-common/printf_buffer_pad_1.c
@@ -0,0 +1,21 @@
+/* Write repeated characters to struct __printf_buffer. Multibyte version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-char.h"
+#include "Xprintf_buffer_pad_1.c"
diff --git a/stdio-common/printf_buffer_putc_1.c b/stdio-common/printf_buffer_putc_1.c
new file mode 100644
index 0000000000..a15e8d16d1
--- /dev/null
+++ b/stdio-common/printf_buffer_putc_1.c
@@ -0,0 +1,21 @@
+/* Overflow character write function for struct __printf_buffer.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-char.h"
+#include "Xprintf_buffer_putc_1.c"
diff --git a/stdio-common/printf_buffer_puts_1.c b/stdio-common/printf_buffer_puts_1.c
new file mode 100644
index 0000000000..ed97fd6b3f
--- /dev/null
+++ b/stdio-common/printf_buffer_puts_1.c
@@ -0,0 +1,21 @@
+/* String write function for struct __printf_buffer. Multibyte version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-char.h"
+#include "Xprintf_buffer_puts_1.c"
diff --git a/stdio-common/printf_buffer_to_file.c b/stdio-common/printf_buffer_to_file.c
new file mode 100644
index 0000000000..6aeb954509
--- /dev/null
+++ b/stdio-common/printf_buffer_to_file.c
@@ -0,0 +1,122 @@
+/* Multibyte printf buffers writing data to a FILE * stream.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer_to_file.h>
+
+#include <assert.h>
+#include <array_length.h>
+#include <libio/libioP.h>
+
+/* Switch to the file buffer if possible. If the file has write_ptr
+ == write_end, use the stage buffer instead. */
+void
+__printf_buffer_to_file_switch (struct __printf_buffer_to_file *buf)
+{
+ if (buf->fp->_IO_write_ptr < buf->fp->_IO_write_end)
+ {
+ /* buf->fp has a buffer associated with it, so write directly to
+ it from now on. */
+ buf->base.write_ptr = buf->fp->_IO_write_ptr;
+ buf->base.write_end = buf->fp->_IO_write_end;
+ }
+ else
+ {
+ /* Use the staging area if no buffer is available in buf->fp. */
+ buf->base.write_ptr = buf->stage;
+ buf->base.write_end = array_end (buf->stage);
+ }
+
+ buf->base.write_base = buf->base.write_ptr;
+}
+
+void
+__printf_buffer_flush_to_file (struct __printf_buffer_to_file *buf)
+{
+ /* The bytes in the buffer are always consumed. */
+ buf->base.written += buf->base.write_ptr - buf->base.write_base;
+
+ if (buf->base.write_end == array_end (buf->stage))
+ {
+ /* If the stage buffer is used, make a copy into the file. The
+ stage buffer is always consumed fully, even if just partially
+ written, to ensure that the file stream has all the data. */
+ size_t count = buf->base.write_ptr - buf->stage;
+ if ((size_t) _IO_sputn (buf->fp, buf->stage, count) != count)
+ {
+ __printf_buffer_mark_failed (&buf->base);
+ return;
+ }
+ /* buf->fp may have a buffer now. */
+ __printf_buffer_to_file_switch (buf);
+ return;
+ }
+ else if (buf->base.write_end == buf->stage + 1)
+ {
+ /* Special one-character buffer case. This is used to avoid
+ flush-only overflow below. */
+ if (buf->base.write_ptr == buf->base.write_end)
+ {
+ if (__overflow (buf->fp, (unsigned char) *buf->stage) == EOF)
+ {
+ __printf_buffer_mark_failed (&buf->base);
+ return;
+ }
+ __printf_buffer_to_file_switch (buf);
+ }
+ /* Else there is nothing to write. */
+ return;
+ }
+
+ /* We have written directly into the buf->fp buffer. */
+ assert (buf->base.write_end == buf->fp->_IO_write_end);
+
+ /* Mark the bytes as written. */
+ buf->fp->_IO_write_ptr = buf->base.write_ptr;
+
+ if (buf->base.write_ptr == buf->base.write_end)
+ {
+ /* The buffer in buf->fp has been filled. This should just call
+ __overflow (buf->fp, EOF), but flush-only overflow is obscure
+ and not always correctly implemented. See bug 28949. Be
+ conservative and switch to a one-character buffer instead, to
+ obtain one more character for a regular __overflow call. */
+ buf->base.write_ptr = buf->stage;
+ buf->base.write_end = buf->stage + 1;
+ }
+ /* The bytes in the file stream were already marked as written above. */
+
+ buf->base.write_base = buf->base.write_ptr;
+}
+
+void
+__printf_buffer_to_file_init (struct __printf_buffer_to_file *buf, FILE *fp)
+{
+ __printf_buffer_init (&buf->base, buf->stage, array_length (buf->stage),
+ __printf_buffer_mode_to_file);
+ buf->fp = fp;
+ __printf_buffer_to_file_switch (buf);
+}
+
+int
+__printf_buffer_to_file_done (struct __printf_buffer_to_file *buf)
+{
+ if (__printf_buffer_has_failed (&buf->base))
+ return -1;
+ __printf_buffer_flush_to_file (buf);
+ return __printf_buffer_done (&buf->base);
+}
diff --git a/stdio-common/printf_buffer_to_file.h b/stdio-common/printf_buffer_to_file.h
new file mode 100644
index 0000000000..97ec1d6d95
--- /dev/null
+++ b/stdio-common/printf_buffer_to_file.h
@@ -0,0 +1,57 @@
+/* Multibyte and wide printf buffers writing data to a FILE * stream.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef PRINTF_BUFFER_TO_FILE_H
+#define PRINTF_BUFFER_TO_FILE_H
+
+#include <bits/types/FILE.h>
+#include <printf_buffer.h>
+
+struct __printf_buffer_to_file
+{
+ struct __printf_buffer base;
+ FILE *fp;
+
+ /* Staging buffer. All data goes through this buffer before
+ reaching the fp stream. (Any buffer in fp is not yet used.) */
+ char stage[128];
+};
+
+/* Initializes *BUF to write data to FP. */
+void __printf_buffer_to_file_init (struct __printf_buffer_to_file *buf,
+ FILE *fp) attribute_hidden;
+
+/* Transfers any pending data in BUF to BUF->FP. The return value
+ follows the printf convention (number bytes written; or -1 for error). */
+int __printf_buffer_to_file_done (struct __printf_buffer_to_file *buf)
+ attribute_hidden;
+
+/* Wide version below. */
+
+struct __wprintf_buffer_to_file
+{
+ struct __wprintf_buffer base;
+ FILE *fp;
+ wchar_t stage[128];
+};
+void __wprintf_buffer_to_file_init (struct __wprintf_buffer_to_file *buf,
+ FILE *fp) attribute_hidden;
+int __wprintf_buffer_to_file_done (struct __wprintf_buffer_to_file *buf)
+ attribute_hidden;
+
+#endif /* PRINTF_BUFFER_TO_FILE_H */
diff --git a/stdio-common/printf_buffer_write.c b/stdio-common/printf_buffer_write.c
new file mode 100644
index 0000000000..1038f69063
--- /dev/null
+++ b/stdio-common/printf_buffer_write.c
@@ -0,0 +1,21 @@
+/* Blob write function for struct __printf_buffer. Multibyte version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-char.h"
+#include "Xprintf_buffer_write.c"
diff --git a/stdio-common/wprintf_buffer_as_file.c b/stdio-common/wprintf_buffer_as_file.c
new file mode 100644
index 0000000000..cd48a7d42a
--- /dev/null
+++ b/stdio-common/wprintf_buffer_as_file.c
@@ -0,0 +1,153 @@
+/* FILE * interface to a struct __wprintf_buffer. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer_as_file.h>
+
+#include <assert.h>
+#include <printf_buffer.h>
+
+/* Commit the data directly written through the stdio stream. */
+static void
+__wprintf_buffer_as_file_commit (struct __wprintf_buffer_as_file *file)
+{
+ /* Check that the write pointers in the file stream are consistent
+ with the next buffer. */
+ assert (file->wide_stream._IO_write_ptr >= file->next->write_ptr);
+ assert (file->wide_stream._IO_write_ptr <= file->next->write_end);
+ assert (file->wide_stream._IO_write_base == file->next->write_base);
+ assert (file->wide_stream._IO_write_end == file->next->write_end);
+
+ file->next->write_ptr = file->wide_stream._IO_write_ptr;
+}
+
+/* Pointer the FILE * write buffer into the active struct __wprintf_buffer
+ area. */
+static void
+__wprintf_buffer_as_file_switch_to_buffer (struct __wprintf_buffer_as_file *file)
+{
+ file->wide_stream._IO_write_base = file->next->write_base;
+ file->wide_stream._IO_write_ptr = file->next->write_ptr;
+ file->wide_stream._IO_write_end = file->next->write_end;
+}
+
+/* Only a small subset of the vtable functions is implemented here,
+ following _IO_obstack_jumps. */
+
+static wint_t
+__wprintf_buffer_as_file_overflow (FILE *fp, int ch)
+{
+ struct __wprintf_buffer_as_file *file
+ = (struct __wprintf_buffer_as_file *) fp;
+
+ __wprintf_buffer_as_file_commit (file);
+
+ /* EOF means only a flush is requested. */
+ if (ch != WEOF)
+ __wprintf_buffer_putc (file->next, ch);
+ else
+ ch = 0;
+
+ /* Ensure that flushing actually produces room. */
+ if (!__wprintf_buffer_has_failed (file->next)
+ && file->next->write_ptr == file->next->write_end)
+ __wprintf_buffer_flush (file->next);
+
+ __wprintf_buffer_as_file_switch_to_buffer (file);
+
+ if (!__wprintf_buffer_has_failed (file->next))
+ return (unsigned char) ch;
+ else
+ return WEOF;
+}
+
+static size_t
+__wprintf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
+{
+ struct __wprintf_buffer_as_file *file
+ = (struct __wprintf_buffer_as_file *) fp;
+
+ __wprintf_buffer_as_file_commit (file);
+
+ /* Copy the data. */
+ __wprintf_buffer_write (file->next, buf, len);
+
+ __wprintf_buffer_as_file_switch_to_buffer (file);
+
+ if (!__wprintf_buffer_has_failed (file->next))
+ return len;
+ else
+ /* We may actually have written something. But the stream is
+ corrupted in this case anyway, so try not to divine the write
+ count here. */
+ return 0;
+}
+
+static const struct _IO_jump_t _IO_wprintf_buffer_as_file_jumps libio_vtable =
+{
+ JUMP_INIT_DUMMY,
+ JUMP_INIT(finish, NULL),
+ JUMP_INIT(overflow, (_IO_overflow_t) __wprintf_buffer_as_file_overflow),
+ JUMP_INIT(underflow, NULL),
+ JUMP_INIT(uflow, NULL),
+ JUMP_INIT(pbackfail, NULL),
+ JUMP_INIT(xsputn, __wprintf_buffer_as_file_xsputn),
+ JUMP_INIT(xsgetn, NULL),
+ JUMP_INIT(seekoff, NULL),
+ JUMP_INIT(seekpos, NULL),
+ JUMP_INIT(setbuf, NULL),
+ JUMP_INIT(sync, NULL),
+ JUMP_INIT(doallocate, NULL),
+ JUMP_INIT(read, NULL),
+ JUMP_INIT(write, NULL),
+ JUMP_INIT(seek, NULL),
+ JUMP_INIT(close, NULL),
+ JUMP_INIT(stat, NULL),
+ JUMP_INIT(showmanyc, NULL),
+ JUMP_INIT(imbue, NULL)
+};
+
+void
+__wprintf_buffer_as_file_init (struct __wprintf_buffer_as_file *file,
+ struct __wprintf_buffer *next)
+{
+ file->stream._lock = NULL;
+ _IO_no_init (&file->stream, _IO_USER_LOCK, 0, &file->wide_stream,
+ &_IO_wprintf_buffer_as_file_jumps);
+ _IO_fwide (&file->stream, 1);
+
+ /* Set up the write buffer from the next buffer. */
+ file->next = next;
+ __wprintf_buffer_as_file_switch_to_buffer (file);
+
+ /* Mark the read area as inactive, by making all pointers equal. */
+ file->stream._IO_read_base = file->stream._IO_write_base;
+ file->stream._IO_read_ptr = file->stream._IO_write_base;
+ file->stream._IO_read_end = file->stream._IO_write_base;
+}
+
+bool
+__wprintf_buffer_as_file_terminate (struct __wprintf_buffer_as_file *file)
+{
+ if (file->stream._flags & _IO_ERR_SEEN)
+ return false;
+ else
+ {
+ __wprintf_buffer_as_file_commit (file);
+ return true;
+ }
+}
diff --git a/stdio-common/wprintf_buffer_done.c b/stdio-common/wprintf_buffer_done.c
new file mode 100644
index 0000000000..60eac03955
--- /dev/null
+++ b/stdio-common/wprintf_buffer_done.c
@@ -0,0 +1,21 @@
+/* Final status reporting for struct __wprintf_buffer. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-wchar_t.h"
+#include "Xprintf_buffer_done.c"
diff --git a/stdio-common/wprintf_buffer_flush.c b/stdio-common/wprintf_buffer_flush.c
new file mode 100644
index 0000000000..2d91095cca
--- /dev/null
+++ b/stdio-common/wprintf_buffer_flush.c
@@ -0,0 +1,36 @@
+/* Flush a struct __wprintf_buffer. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+
+#include "printf_buffer-wchar_t.h"
+#include "Xprintf_buffer_flush.c"
+
+static void
+__wprintf_buffer_do_flush (struct __wprintf_buffer *buf)
+{
+ switch (buf->mode)
+ {
+ case __wprintf_buffer_mode_failed:
+ return;
+ case __wprintf_buffer_mode_to_file:
+ __wprintf_buffer_flush_to_file ((struct __wprintf_buffer_to_file *) buf);
+ return;
+ }
+ __builtin_trap ();
+}
diff --git a/stdio-common/wprintf_buffer_pad_1.c b/stdio-common/wprintf_buffer_pad_1.c
new file mode 100644
index 0000000000..9c91126f42
--- /dev/null
+++ b/stdio-common/wprintf_buffer_pad_1.c
@@ -0,0 +1,21 @@
+/* Write repeated characters to struct __wprintf_buffer. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-wchar_t.h"
+#include "Xprintf_buffer_pad_1.c"
diff --git a/stdio-common/wprintf_buffer_putc_1.c b/stdio-common/wprintf_buffer_putc_1.c
new file mode 100644
index 0000000000..b1af68e721
--- /dev/null
+++ b/stdio-common/wprintf_buffer_putc_1.c
@@ -0,0 +1,21 @@
+/* Overflow character write function for struct __wprintf_buffer. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-wchar_t.h"
+#include "Xprintf_buffer_putc_1.c"
diff --git a/stdio-common/wprintf_buffer_puts_1.c b/stdio-common/wprintf_buffer_puts_1.c
new file mode 100644
index 0000000000..039aebb56e
--- /dev/null
+++ b/stdio-common/wprintf_buffer_puts_1.c
@@ -0,0 +1,21 @@
+/* String write function struct __wprintf_buffer. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-wchar_t.h"
+#include "Xprintf_buffer_puts_1.c"
diff --git a/stdio-common/wprintf_buffer_to_file.c b/stdio-common/wprintf_buffer_to_file.c
new file mode 100644
index 0000000000..ac936fab6c
--- /dev/null
+++ b/stdio-common/wprintf_buffer_to_file.c
@@ -0,0 +1,55 @@
+/* Wide printf buffers writing data to a FILE *.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* This implementation is not optimized (unlikely the multibyte
+ implementation) and always writes to the temporary buffer first. */
+
+#include <printf_buffer_to_file.h>
+
+#include <array_length.h>
+#include <libio/libioP.h>
+
+void
+__wprintf_buffer_flush_to_file (struct __wprintf_buffer_to_file *buf)
+{
+ size_t count = buf->base.write_ptr - buf->stage;
+ if ((size_t) _IO_sputn (buf->fp, buf->stage, count) != count)
+ {
+ __wprintf_buffer_mark_failed (&buf->base);
+ return;
+ }
+ buf->base.written += count;
+ buf->base.write_ptr = buf->stage;
+}
+
+void
+__wprintf_buffer_to_file_init (struct __wprintf_buffer_to_file *buf, FILE *fp)
+{
+ __wprintf_buffer_init (&buf->base, buf->stage, array_length (buf->stage),
+ __wprintf_buffer_mode_to_file);
+ buf->fp = fp;
+}
+
+int
+__wprintf_buffer_to_file_done (struct __wprintf_buffer_to_file *buf)
+{
+ if (__wprintf_buffer_has_failed (&buf->base))
+ return -1;
+ __wprintf_buffer_flush_to_file (buf);
+ return __wprintf_buffer_done (&buf->base);
+}
diff --git a/stdio-common/wprintf_buffer_write.c b/stdio-common/wprintf_buffer_write.c
new file mode 100644
index 0000000000..06b53c74c3
--- /dev/null
+++ b/stdio-common/wprintf_buffer_write.c
@@ -0,0 +1,21 @@
+/* Blob write function for struct __wprintf_buffer. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf_buffer.h>
+#include "printf_buffer-wchar_t.h"
+#include "Xprintf_buffer_write.c"
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 06/14] stdio-common: Add __printf_function_invoke
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (4 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-06-03 13:51 ` Adhemerval Zanella
2022-05-23 14:07 ` [PATCH v2 07/14] stdio-common: Add __translated_number_width Florian Weimer
` (7 subsequent siblings)
13 siblings, 1 reply; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
And __wprintf_function_invoke. These functions will be used to
to call registered printf specifier callbacks on printf buffers
after vfprintf and vfwprintf have been converted to buffers.
---
include/printf.h | 10 ++++++
stdio-common/Makefile | 2 ++
stdio-common/Xprintf_function_invoke.c | 42 ++++++++++++++++++++++++++
stdio-common/printf_function_invoke.c | 22 ++++++++++++++
stdio-common/wprintf_function_invoke.c | 22 ++++++++++++++
5 files changed, 98 insertions(+)
create mode 100644 stdio-common/Xprintf_function_invoke.c
create mode 100644 stdio-common/printf_function_invoke.c
create mode 100644 stdio-common/wprintf_function_invoke.c
diff --git a/include/printf.h b/include/printf.h
index 78accaab6d..8f064149d3 100644
--- a/include/printf.h
+++ b/include/printf.h
@@ -41,6 +41,16 @@ union printf_arg
void *pa_user;
};
+/* Invoke a registered printf callback. Called from vfprintf and vfwprintf. */
+int __printf_function_invoke (void *, printf_function callback,
+ union printf_arg *args_value,
+ size_t ndata_args,
+ struct printf_info *info) attribute_hidden;
+int __wprintf_function_invoke (void *, printf_function callback,
+ union printf_arg *args_value,
+ size_t ndata_args,
+ struct printf_info *info) attribute_hidden;
+
#include <bits/types/locale_t.h>
/* Now define the internal interfaces. */
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 5ba381fe41..9195b209cd 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -63,6 +63,7 @@ routines := \
printf_buffer_write \
printf_fp \
printf_fphex \
+ printf_function_invoke \
printf_size \
psiginfo \
psignal \
@@ -101,6 +102,7 @@ routines := \
wprintf_buffer_puts_1 \
wprintf_buffer_to_file \
wprintf_buffer_write \
+ wprintf_function_invoke \
# routines
aux := \
diff --git a/stdio-common/Xprintf_function_invoke.c b/stdio-common/Xprintf_function_invoke.c
new file mode 100644
index 0000000000..f631469ba9
--- /dev/null
+++ b/stdio-common/Xprintf_function_invoke.c
@@ -0,0 +1,42 @@
+/* Invoke a printf specifier handler. Generic version.
+ Copyright (C) 1991-2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+int
+Xprintf (function_invoke) (void *buf,
+ printf_function callback,
+ union printf_arg *args_value,
+ size_t ndata_args,
+ struct printf_info *info)
+{
+ const void *args[ndata_args];
+ for (unsigned int i = 0; i < ndata_args; ++i)
+ args[i] = &args_value[i];
+
+ struct Xprintf (buffer_as_file) s;
+ Xprintf (buffer_as_file_init) (&s, buf);
+
+ /* Call the function. */
+ int done = callback (Xprintf (buffer_as_file_get) (&s), info, args);
+
+ if (!Xprintf (buffer_as_file_terminate) (&s))
+ /* Low-level error. */
+ return -1;
+
+ /* Potential error from the callback function. */
+ return done;
+}
diff --git a/stdio-common/printf_function_invoke.c b/stdio-common/printf_function_invoke.c
new file mode 100644
index 0000000000..8919b892ca
--- /dev/null
+++ b/stdio-common/printf_function_invoke.c
@@ -0,0 +1,22 @@
+/* Invoke a printf specifier handler. Multibyte version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf.h>
+#include <printf_buffer_as_file.h>
+#include "printf_buffer-char.h"
+#include "Xprintf_function_invoke.c"
diff --git a/stdio-common/wprintf_function_invoke.c b/stdio-common/wprintf_function_invoke.c
new file mode 100644
index 0000000000..29a6b4e073
--- /dev/null
+++ b/stdio-common/wprintf_function_invoke.c
@@ -0,0 +1,22 @@
+/* Invoke a printf specifier handler. Wide version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <printf.h>
+#include <printf_buffer_as_file.h>
+#include "printf_buffer-wchar_t.h"
+#include "Xprintf_function_invoke.c"
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 07/14] stdio-common: Add __translated_number_width
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (5 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 06/14] stdio-common: Add __printf_function_invoke Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 08/14] stdio-common: Convert vfprintf and related functions to buffers Florian Weimer
` (6 subsequent siblings)
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
This function will be used to compute the width of a number
after i18n digit translation.
---
include/printf.h | 13 +++++++-
stdio-common/Makefile | 1 +
stdio-common/translated_number_width.c | 42 ++++++++++++++++++++++++++
3 files changed, 55 insertions(+), 1 deletion(-)
create mode 100644 stdio-common/translated_number_width.c
diff --git a/include/printf.h b/include/printf.h
index 8f064149d3..5127a45f9b 100644
--- a/include/printf.h
+++ b/include/printf.h
@@ -53,7 +53,18 @@ int __wprintf_function_invoke (void *, printf_function callback,
#include <bits/types/locale_t.h>
-/* Now define the internal interfaces. */
+/* Returns the width (as for printf, in bytes) of the converted ASCII
+ number in the characters in the range [FIRST, LAST). The range
+ must only contain ASCII digits. The caller is responsible for
+ avoiding overflow.
+
+ This function is used during non-wide digit translation. Wide
+ digit translate produces one wide character per ASCII digit,
+ so the width is simply LAST - FIRST. */
+int __translated_number_width (locale_t loc,
+ const char *first, const char *last)
+ attribute_hidden;
+
extern int __printf_fphex (FILE *, const struct printf_info *,
const void *const *) attribute_hidden;
extern int __printf_fp (FILE *, const struct printf_info *,
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 9195b209cd..902b8e9db3 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -85,6 +85,7 @@ routines := \
tmpfile64 \
tmpnam \
tmpnam_r \
+ translated_number_width \
vfprintf \
vfprintf-internal \
vfscanf \
diff --git a/stdio-common/translated_number_width.c b/stdio-common/translated_number_width.c
new file mode 100644
index 0000000000..f42d5968a1
--- /dev/null
+++ b/stdio-common/translated_number_width.c
@@ -0,0 +1,42 @@
+/* Compute the printf width of a sequence of ASCII digits.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <assert.h>
+#include <limits.h>
+#include <locale/localeinfo.h>
+#include <printf.h>
+
+int
+__translated_number_width (locale_t loc, const char *first, const char *last)
+{
+ struct lc_ctype_data *ctype = loc->__locales[LC_CTYPE]->private;
+
+ if (ctype->outdigit_bytes_all_equal > 0)
+ return (last - first) * ctype->outdigit_bytes_all_equal;
+ else
+ {
+ /* Digits have varying length, so the fast path cannot be used. */
+ int digits = 0;
+ for (const char *p = first; p < last; ++p)
+ {
+ assert ('0' <= *p && *p <= '9');
+ digits += ctype->outdigit_bytes[*p - '0'];
+ }
+ return digits;
+ }
+}
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 08/14] stdio-common: Convert vfprintf and related functions to buffers
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (6 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 07/14] stdio-common: Add __translated_number_width Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 20:23 ` Joseph Myers
2022-05-23 14:07 ` [PATCH v2 09/14] stdio-common: Add lock optimization to vfprintf and vfwprintf Florian Weimer
` (5 subsequent siblings)
13 siblings, 1 reply; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
vfprintf is entangled with vfwprintf (of course), __printf_fp,
__printf_fphex, __vstrfmon_l_internal, and the strfrom family of
functions. The latter use the internal snprintf functionality,
so vsnprintf is converted as well.
The simples conversion is __printf_fphex, followed by
__vstrfmon_l_internal and __printf_fp, and finally
__vfprintf_internal and __vfwprintf_internal. __vsnprintf_internal
and strfrom* are mostly consuming the new interfaces, so they
are comparatively simple.
__printf_fp is a public symbol, so the FILE *-based interface
had to preserved.
The __printf_fp rewrite does not change the actual binary-to-decimal
conversion algorithm, and digits are still not emitted directly to
the target buffer. However, the staging buffer now uses bytes
instead of wide characters, and one buffer copy is eliminated.
The changes are at least performance-neutral in my testing.
Floating point printing and snprintf improved measurably, so that
this Lua script
for i=1,5000000 do
print(i, i * math.pi)
end
runs about 5% faster for me. To preserve fprintf performance for
a simple "%d" format, this commit has some logic changes under
LABEL (unsigned_number) to avoid additional function calls. There
are certainly some very easy performance improvements here: binary,
octal and hexadecimal formatting can easily avoid the temporary work
buffer (the number of digits can be computed ahead-of-time using one
of the __builtin_clz* built-ins). Decimal formatting can use a
specialized version of _itoa_word for base 10.
The existing (inconsistent) width handling between strfmon and printf
is preserved here. __print_fp_buffer_1 would have to use
__translated_number_width to achieve ISO conformance for printf.
Test expectations in libio/tst-vtables-common.c are adjusted because
the internal staging buffer merges all virtual function calls into
one.
In general, stack buffer usage is greatly reduced, particularly for
unbuffered input streams. __printf_fp can still use a large buffer
in binary128 mode for %g, though.
---
include/printf.h | 29 +-
include/printf_buffer.h | 36 +
libio/tst-vtables-common.c | 9 +-
libio/vsnprintf.c | 131 ++--
stdio-common/printf_buffer_flush.c | 23 +
stdio-common/printf_fp.c | 736 ++++++++----------
stdio-common/printf_fphex.c | 260 +++----
stdio-common/vfprintf-internal.c | 664 +++++-----------
stdio-common/vfprintf-process-arg.c | 172 ++--
stdlib/strfmon_l.c | 196 ++---
stdlib/strfrom-skeleton.c | 38 +-
sysdeps/ia64/fpu/printf_fphex.c | 8 +-
.../ieee754/ldbl-128/printf_fphex_macros.h | 36 +-
sysdeps/ieee754/ldbl-128ibm/printf_fphex.c | 36 +-
sysdeps/ieee754/ldbl-96/printf_fphex.c | 22 +-
sysdeps/x86_64/fpu/printf_fphex.c | 21 +-
16 files changed, 943 insertions(+), 1474 deletions(-)
diff --git a/include/printf.h b/include/printf.h
index 5127a45f9b..2c998059d4 100644
--- a/include/printf.h
+++ b/include/printf.h
@@ -65,18 +65,31 @@ int __translated_number_width (locale_t loc,
const char *first, const char *last)
attribute_hidden;
-extern int __printf_fphex (FILE *, const struct printf_info *,
- const void *const *) attribute_hidden;
+
+struct __printf_buffer;
+void __printf_buffer (struct __printf_buffer *buf, const char *format,
+ va_list ap, unsigned int mode_flags);
+struct __wprintf_buffer;
+void __wprintf_buffer (struct __wprintf_buffer *buf, const wchar_t *format,
+ va_list ap, unsigned int mode_flags);
+
extern int __printf_fp (FILE *, const struct printf_info *,
const void *const *);
libc_hidden_proto (__printf_fp)
-extern int __printf_fp_l (FILE *, locale_t, const struct printf_info *,
- const void *const *);
-libc_hidden_proto (__printf_fp_l)
-extern unsigned int __guess_grouping (unsigned int intdig_max,
- const char *grouping)
- attribute_hidden;
+void __printf_fphex_l_buffer (struct __printf_buffer *, locale_t,
+ const struct printf_info *,
+ const void *const *) attribute_hidden;
+void __printf_fp_l_buffer (struct __printf_buffer *, locale_t,
+ const struct printf_info *,
+ const void *const *) attribute_hidden;
+struct __wprintf_buffer;
+void __wprintf_fphex_l_buffer (struct __wprintf_buffer *, locale_t,
+ const struct printf_info *,
+ const void *const *) attribute_hidden;
+void __wprintf_fp_l_buffer (struct __wprintf_buffer *, locale_t,
+ const struct printf_info *,
+ const void *const *) attribute_hidden;
# endif /* !_ISOMAC */
#endif
diff --git a/include/printf_buffer.h b/include/printf_buffer.h
index 6be7723869..95d1b06489 100644
--- a/include/printf_buffer.h
+++ b/include/printf_buffer.h
@@ -44,7 +44,12 @@
enum __printf_buffer_mode
{
__printf_buffer_mode_failed,
+ __printf_buffer_mode_snprintf,
__printf_buffer_mode_to_file,
+ __printf_buffer_mode_strfmon,
+ __printf_buffer_mode_fp, /* For __printf_fp_l_buffer. */
+ __printf_buffer_mode_fp_to_wide, /* For __wprintf_fp_l_buffer. */
+ __printf_buffer_mode_fphex_to_wide, /* For __wprintf_fphex_l_buffer. */
};
/* Buffer for fast character writing with overflow handling.
@@ -266,13 +271,44 @@ bool __wprintf_buffer_flush (struct __wprintf_buffer *buf) attribute_hidden;
#define Xprintf_buffer_puts Xprintf (buffer_puts)
#define Xprintf_buffer_write Xprintf (buffer_write)
+/* Commonly used buffers. */
+
+struct __printf_buffer_snprintf
+{
+ struct __printf_buffer base;
+ char discard[128]; /* Used in counting mode. */
+};
+
+/* Sets up [BUFFER, BUFFER + LENGTH) as the write target. If LENGTH
+ is positive, also writes a NUL byte to *BUFFER. */
+void __printf_buffer_snprintf_init (struct __printf_buffer_snprintf *,
+ char *buffer, size_t length)
+ attribute_hidden;
+
+/* Add the null terminator after everything has been written. The
+ return value is the one expected by printf (see __printf_buffer_done). */
+int __printf_buffer_snprintf_done (struct __printf_buffer_snprintf *)
+ attribute_hidden;
+
/* Flush function implementations follow. They are called from
__printf_buffer_flush. Generic code should not call these flush
functions directly. Some modes have inline implementations. */
+void __printf_buffer_flush_snprintf (struct __printf_buffer_snprintf *)
+ attribute_hidden;
struct __printf_buffer_to_file;
void __printf_buffer_flush_to_file (struct __printf_buffer_to_file *)
attribute_hidden;
+struct __printf_buffer_fp;
+void __printf_buffer_flush_fp (struct __printf_buffer_fp *)
+ attribute_hidden;
+struct __printf_buffer_fp_to_wide;
+void __printf_buffer_flush_fp_to_wide (struct __printf_buffer_fp_to_wide *)
+ attribute_hidden;
+struct __printf_buffer_fphex_to_wide;
+void __printf_buffer_flush_fphex_to_wide (struct
+ __printf_buffer_fphex_to_wide *)
+ attribute_hidden;
struct __wprintf_buffer_to_file;
void __wprintf_buffer_flush_to_file (struct __wprintf_buffer_to_file *)
diff --git a/libio/tst-vtables-common.c b/libio/tst-vtables-common.c
index d18df23e55..a310e516f2 100644
--- a/libio/tst-vtables-common.c
+++ b/libio/tst-vtables-common.c
@@ -409,11 +409,14 @@ void _IO_init (FILE *fp, int flags);
static void
with_compatibility_fprintf (void *closure)
{
+ /* A temporary staging buffer is used in the current fprintf
+ implementation, which is why there is just one call to
+ xsputn. */
TEST_COMPARE (fprintf_ptr (shared->fp, "A%sCD", "B"), 4);
- TEST_COMPARE (shared->calls, 3);
- TEST_COMPARE (shared->calls_xsputn, 3);
+ TEST_COMPARE (shared->calls, 1);
+ TEST_COMPARE (shared->calls_xsputn, 1);
TEST_COMPARE_BLOB (shared->buffer, shared->buffer_length,
- "CD", 2);
+ "ABCD", 4);
}
static void
diff --git a/libio/vsnprintf.c b/libio/vsnprintf.c
index 8dae66761d..7a9667f966 100644
--- a/libio/vsnprintf.c
+++ b/libio/vsnprintf.c
@@ -25,97 +25,76 @@
in files containing the exception. */
#include "libioP.h"
-#include "strfile.h"
-static int _IO_strn_overflow (FILE *fp, int c) __THROW;
+#include <array_length.h>
+#include <printf.h>
+#include <printf_buffer.h>
-static int
-_IO_strn_overflow (FILE *fp, int c)
+void
+__printf_buffer_flush_snprintf (struct __printf_buffer_snprintf *buf)
{
- /* When we come to here this means the user supplied buffer is
- filled. But since we must return the number of characters which
- would have been written in total we must provide a buffer for
- further use. We can do this by writing on and on in the overflow
- buffer in the _IO_strnfile structure. */
- _IO_strnfile *snf = (_IO_strnfile *) fp;
-
- if (fp->_IO_buf_base != snf->overflow_buf)
+ /* Record the bytes written so far, before switching buffers. */
+ buf->base.written += buf->base.write_ptr - buf->base.write_base;
+
+ if (buf->base.write_base != buf->discard)
{
- /* Terminate the string. We know that there is room for at
- least one more character since we initialized the stream with
- a size to make this possible. */
- *fp->_IO_write_ptr = '\0';
-
- _IO_setb (fp, snf->overflow_buf,
- snf->overflow_buf + sizeof (snf->overflow_buf), 0);
-
- fp->_IO_write_base = snf->overflow_buf;
- fp->_IO_read_base = snf->overflow_buf;
- fp->_IO_read_ptr = snf->overflow_buf;
- fp->_IO_read_end = snf->overflow_buf + sizeof (snf->overflow_buf);
- }
+ /* We just finished writing the caller-supplied buffer. Force
+ NUL termination if the string length is not zero. */
+ if (buf->base.write_base != buf->base.write_end)
+ buf->base.write_end[-1] = '\0';
- fp->_IO_write_ptr = snf->overflow_buf;
- fp->_IO_write_end = snf->overflow_buf;
- /* Since we are not really interested in storing the characters
- which do not fit in the buffer we simply ignore it. */
- return c;
-}
+ /* Switch to the discard buffer. */
+ buf->base.write_base = buf->discard;
+ buf->base.write_ptr = buf->discard;
+ buf->base.write_end = array_end (buf->discard);
+ }
+ buf->base.write_base = buf->discard;
+ buf->base.write_ptr = buf->discard;
+}
-const struct _IO_jump_t _IO_strn_jumps libio_vtable attribute_hidden =
+void
+__printf_buffer_snprintf_init (struct __printf_buffer_snprintf *buf,
+ char *buffer, size_t length)
{
- JUMP_INIT_DUMMY,
- JUMP_INIT(finish, _IO_str_finish),
- JUMP_INIT(overflow, _IO_strn_overflow),
- JUMP_INIT(underflow, _IO_str_underflow),
- JUMP_INIT(uflow, _IO_default_uflow),
- JUMP_INIT(pbackfail, _IO_str_pbackfail),
- JUMP_INIT(xsputn, _IO_default_xsputn),
- JUMP_INIT(xsgetn, _IO_default_xsgetn),
- JUMP_INIT(seekoff, _IO_str_seekoff),
- JUMP_INIT(seekpos, _IO_default_seekpos),
- JUMP_INIT(setbuf, _IO_default_setbuf),
- JUMP_INIT(sync, _IO_default_sync),
- JUMP_INIT(doallocate, _IO_default_doallocate),
- JUMP_INIT(read, _IO_default_read),
- JUMP_INIT(write, _IO_default_write),
- JUMP_INIT(seek, _IO_default_seek),
- JUMP_INIT(close, _IO_default_close),
- JUMP_INIT(stat, _IO_default_stat),
- JUMP_INIT(showmanyc, _IO_default_showmanyc),
- JUMP_INIT(imbue, _IO_default_imbue)
-};
+ __printf_buffer_init (&buf->base, buffer, length,
+ __printf_buffer_mode_snprintf);
+ if (length > 0)
+ /* Historic behavior for trivially overlapping buffers (checked by
+ the test suite). */
+ *buffer = '\0';
+}
+int
+__printf_buffer_snprintf_done (struct __printf_buffer_snprintf *buf)
+{
+ /* NB: Do not check for buf->base.fail here. Write the null
+ terminator even in case of errors. */
+
+ if (buf->base.write_ptr < buf->base.write_end)
+ *buf->base.write_ptr = '\0';
+ else if (buf->base.write_ptr > buf->base.write_base)
+ /* If write_ptr == write_base, nothing has been written. No null
+ termination is needed because of the early truncation in
+ __printf_buffer_snprintf_init (the historic behavior).
+
+ We might also be at the start of the discard buffer, but in
+ this case __printf_buffer_flush_snprintf has already written
+ the NUL terminator. */
+ buf->base.write_ptr[-1] = '\0';
+
+ return __printf_buffer_done (&buf->base);
+}
int
__vsnprintf_internal (char *string, size_t maxlen, const char *format,
va_list args, unsigned int mode_flags)
{
- _IO_strnfile sf;
- int ret;
-#ifdef _IO_MTSAFE_IO
- sf.f._sbf._f._lock = NULL;
-#endif
-
- /* We need to handle the special case where MAXLEN is 0. Use the
- overflow buffer right from the start. */
- if (maxlen == 0)
- {
- string = sf.overflow_buf;
- maxlen = sizeof (sf.overflow_buf);
- }
-
- _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
- _IO_JUMPS (&sf.f._sbf) = &_IO_strn_jumps;
- string[0] = '\0';
- _IO_str_init_static_internal (&sf.f, string, maxlen - 1, string);
- ret = __vfprintf_internal (&sf.f._sbf._f, format, args, mode_flags);
-
- if (sf.f._sbf._f._IO_buf_base != sf.overflow_buf)
- *sf.f._sbf._f._IO_write_ptr = '\0';
- return ret;
+ struct __printf_buffer_snprintf buf;
+ __printf_buffer_snprintf_init (&buf, string, maxlen);
+ __printf_buffer (&buf.base, format, args, mode_flags);
+ return __printf_buffer_snprintf_done (&buf);
}
int
diff --git a/stdio-common/printf_buffer_flush.c b/stdio-common/printf_buffer_flush.c
index 9b25c0fde5..bfd1f9d733 100644
--- a/stdio-common/printf_buffer_flush.c
+++ b/stdio-common/printf_buffer_flush.c
@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <errno.h>
#include <printf_buffer.h>
#include "printf_buffer-char.h"
@@ -24,7 +25,11 @@
/* The __printf_buffer_flush_* functions are defined together with
functions that are pulled in by strong references. */
#ifndef SHARED
+# pragma weak __printf_buffer_flush_snprintf
# pragma weak __printf_buffer_flush_to_file
+# pragma weak __printf_buffer_flush_fp
+# pragma weak __printf_buffer_flush_fp_to_wide
+# pragma weak __printf_buffer_flush_fphex_to_wide
#endif /* !SHARED */
static void
@@ -34,9 +39,27 @@ __printf_buffer_do_flush (struct __printf_buffer *buf)
{
case __printf_buffer_mode_failed:
return;
+ case __printf_buffer_mode_snprintf:
+ __printf_buffer_flush_snprintf ((struct __printf_buffer_snprintf *) buf);
+ return;
case __printf_buffer_mode_to_file:
__printf_buffer_flush_to_file ((struct __printf_buffer_to_file *) buf);
return;
+ case __printf_buffer_mode_strfmon:
+ __set_errno (E2BIG);
+ __printf_buffer_mark_failed (buf);
+ return;
+ case __printf_buffer_mode_fp:
+ __printf_buffer_flush_fp ((struct __printf_buffer_fp *) buf);
+ return;
+ case __printf_buffer_mode_fp_to_wide:
+ __printf_buffer_flush_fp_to_wide
+ ((struct __printf_buffer_fp_to_wide *) buf);
+ return;
+ case __printf_buffer_mode_fphex_to_wide:
+ __printf_buffer_flush_fphex_to_wide
+ ((struct __printf_buffer_fphex_to_wide *) buf);
+ return;
}
__builtin_trap ();
}
diff --git a/stdio-common/printf_fp.c b/stdio-common/printf_fp.c
index 3a5560fc16..5c9c30aaee 100644
--- a/stdio-common/printf_fp.c
+++ b/stdio-common/printf_fp.c
@@ -41,90 +41,12 @@
#include <wchar.h>
#include <stdbool.h>
#include <rounding-mode.h>
+#include <printf_buffer.h>
+#include <printf_buffer_to_file.h>
+#include <grouping_iterator.h>
-#ifdef COMPILE_WPRINTF
-# define CHAR_T wchar_t
-#else
-# define CHAR_T char
-#endif
-
-#include "_i18n_number.h"
-
-#ifndef NDEBUG
-# define NDEBUG /* Undefine this for debugging assertions. */
-#endif
#include <assert.h>
-#define PUT(f, s, n) _IO_sputn (f, s, n)
-#define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : _IO_padn (f, c, n))
-#undef putc
-#define putc(c, f) (wide \
- ? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f))
-
-\f
-/* Macros for doing the actual output. */
-
-#define outchar(ch) \
- do \
- { \
- const int outc = (ch); \
- if (putc (outc, fp) == EOF) \
- { \
- if (buffer_malloced) \
- { \
- free (buffer); \
- free (wbuffer); \
- } \
- return -1; \
- } \
- ++done; \
- } while (0)
-
-#define PRINT(ptr, wptr, len) \
- do \
- { \
- size_t outlen = (len); \
- if (len > 20) \
- { \
- if (PUT (fp, wide ? (const char *) wptr : ptr, outlen) != outlen) \
- { \
- if (buffer_malloced) \
- { \
- free (buffer); \
- free (wbuffer); \
- } \
- return -1; \
- } \
- ptr += outlen; \
- done += outlen; \
- } \
- else \
- { \
- if (wide) \
- while (outlen-- > 0) \
- outchar (*wptr++); \
- else \
- while (outlen-- > 0) \
- outchar (*ptr++); \
- } \
- } while (0)
-
-#define PADN(ch, len) \
- do \
- { \
- if (PAD (fp, ch, len) != len) \
- { \
- if (buffer_malloced) \
- { \
- free (buffer); \
- free (wbuffer); \
- } \
- return -1; \
- } \
- done += len; \
- } \
- while (0)
-\f
/* We use the GNU MP library to handle large numbers.
An MP variable occupies a varying number of entries in its array. We keep
@@ -145,10 +67,6 @@ extern mp_size_t __mpn_extract_long_double (mp_ptr res_ptr, mp_size_t size,
long double value);
-static wchar_t *group_number (wchar_t *buf, wchar_t *bufend,
- unsigned int intdig_no, const char *grouping,
- wchar_t thousands_sep, int ngroups);
-
struct hack_digit_param
{
/* Sign of the exponent. */
@@ -165,7 +83,7 @@ struct hack_digit_param
MPN_VAR(tmp);
};
-static wchar_t
+static char
hack_digit (struct hack_digit_param *p)
{
mp_limb_t hi;
@@ -197,7 +115,7 @@ hack_digit (struct hack_digit_param *p)
/* We're not prepared for an mpn variable with zero
limbs. */
p->fracsize = 1;
- return L'0' + hi;
+ return '0' + hi;
}
}
@@ -206,13 +124,22 @@ hack_digit (struct hack_digit_param *p)
p->frac[p->fracsize++] = _cy;
}
- return L'0' + hi;
+ return '0' + hi;
}
-int
-__printf_fp_l (FILE *fp, locale_t loc,
- const struct printf_info *info,
- const void *const *args)
+/* Version that performs grouping (if INFO->group && THOUSANDS_SEP != 0),
+ but not i18n digit translation.
+
+ The output buffer is always multibyte (not wide) at this stage.
+ Wide conversion and i18n digit translation happen later, with a
+ temporary buffer. To prepare for that, THOUSANDS_SEP_LENGTH is the
+ final length of the thousands separator. */
+static void
+__printf_fp_buffer_1 (struct __printf_buffer *buf, locale_t loc,
+ char thousands_sep, char decimal,
+ unsigned int thousands_sep_length,
+ const struct printf_info *info,
+ const void *const *args)
{
/* The floating-point value to output. */
union
@@ -225,18 +152,11 @@ __printf_fp_l (FILE *fp, locale_t loc,
}
fpnum;
- /* Locale-dependent representation of decimal point. */
- const char *decimal;
- wchar_t decimalwc;
-
- /* Locale-dependent thousands separator and grouping specification. */
- const char *thousands_sep = NULL;
- wchar_t thousands_sepwc = 0;
- const char *grouping;
-
/* "NaN" or "Inf" for the special cases. */
const char *special = NULL;
- const wchar_t *wspecial = NULL;
+
+ /* Used to determine grouping rules. */
+ int lc_category = info->extra ? LC_MONETARY : LC_NUMERIC;
/* When _Float128 is enabled in the library and ABI-distinct from long
double, we need mp_limbs enough for any of them. */
@@ -256,90 +176,16 @@ __printf_fp_l (FILE *fp, locale_t loc,
/* Sign of float number. */
int is_neg = 0;
- /* Counter for number of written characters. */
- int done = 0;
-
/* General helper (carry limb). */
mp_limb_t cy;
- /* Nonzero if this is output on a wide character stream. */
- int wide = info->wide;
-
/* Buffer in which we produce the output. */
- wchar_t *wbuffer = NULL;
- char *buffer = NULL;
+ char *wbuffer = NULL;
/* Flag whether wbuffer and buffer are malloc'ed or not. */
int buffer_malloced = 0;
p.expsign = 0;
- /* Figure out the decimal point character. */
- if (info->extra == 0)
- {
- decimal = _nl_lookup (loc, LC_NUMERIC, DECIMAL_POINT);
- decimalwc = _nl_lookup_word
- (loc, LC_NUMERIC, _NL_NUMERIC_DECIMAL_POINT_WC);
- }
- else
- {
- decimal = _nl_lookup (loc, LC_MONETARY, MON_DECIMAL_POINT);
- if (*decimal == '\0')
- decimal = _nl_lookup (loc, LC_NUMERIC, DECIMAL_POINT);
- decimalwc = _nl_lookup_word (loc, LC_MONETARY,
- _NL_MONETARY_DECIMAL_POINT_WC);
- if (decimalwc == L'\0')
- decimalwc = _nl_lookup_word (loc, LC_NUMERIC,
- _NL_NUMERIC_DECIMAL_POINT_WC);
- }
- /* The decimal point character must not be zero. */
- assert (*decimal != '\0');
- assert (decimalwc != L'\0');
-
- if (info->group)
- {
- if (info->extra == 0)
- grouping = _nl_lookup (loc, LC_NUMERIC, GROUPING);
- else
- grouping = _nl_lookup (loc, LC_MONETARY, MON_GROUPING);
-
- if (*grouping <= 0 || *grouping == CHAR_MAX)
- grouping = NULL;
- else
- {
- /* Figure out the thousands separator character. */
- if (wide)
- {
- if (info->extra == 0)
- thousands_sepwc = _nl_lookup_word
- (loc, LC_NUMERIC, _NL_NUMERIC_THOUSANDS_SEP_WC);
- else
- thousands_sepwc =
- _nl_lookup_word (loc, LC_MONETARY,
- _NL_MONETARY_THOUSANDS_SEP_WC);
- }
- else
- {
- if (info->extra == 0)
- thousands_sep = _nl_lookup (loc, LC_NUMERIC, THOUSANDS_SEP);
- else
- thousands_sep = _nl_lookup
- (loc, LC_MONETARY, MON_THOUSANDS_SEP);
- }
-
- if ((wide && thousands_sepwc == L'\0')
- || (! wide && *thousands_sep == '\0'))
- grouping = NULL;
- else if (thousands_sepwc == L'\0')
- /* If we are printing multibyte characters and there is a
- multibyte representation for the thousands separator,
- we must ensure the wide character thousands separator
- is available, even if it is fake. */
- thousands_sepwc = 0xfffffffe;
- }
- }
- else
- grouping = NULL;
-
#define PRINTF_FP_FETCH(FLOAT, VAR, SUFFIX, MANT_DIG) \
{ \
(VAR) = *(const FLOAT *) args[0]; \
@@ -349,29 +195,17 @@ __printf_fp_l (FILE *fp, locale_t loc,
{ \
is_neg = signbit (VAR); \
if (isupper (info->spec)) \
- { \
- special = "NAN"; \
- wspecial = L"NAN"; \
- } \
+ special = "NAN"; \
else \
- { \
- special = "nan"; \
- wspecial = L"nan"; \
- } \
+ special = "nan"; \
} \
else if (isinf (VAR)) \
{ \
is_neg = signbit (VAR); \
if (isupper (info->spec)) \
- { \
- special = "INF"; \
- wspecial = L"INF"; \
- } \
+ special = "INF"; \
else \
- { \
- special = "inf"; \
- wspecial = L"inf"; \
- } \
+ special = "inf"; \
} \
else \
{ \
@@ -405,22 +239,22 @@ __printf_fp_l (FILE *fp, locale_t loc,
--width;
width -= 3;
- if (!info->left && width > 0)
- PADN (' ', width);
+ if (!info->left)
+ __printf_buffer_pad (buf, ' ', width);
if (is_neg)
- outchar ('-');
+ __printf_buffer_putc (buf, '-');
else if (info->showsign)
- outchar ('+');
+ __printf_buffer_putc (buf, '+');
else if (info->space)
- outchar (' ');
+ __printf_buffer_putc (buf, ' ');
- PRINT (special, wspecial, 3);
+ __printf_buffer_puts (buf, special);
- if (info->left && width > 0)
- PADN (' ', width);
+ if (info->left)
+ __printf_buffer_pad (buf, ' ', width);
- return done;
+ return;
}
@@ -829,7 +663,7 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
int width = info->width;
- wchar_t *wstartp, *wcp;
+ char *wstartp, *wcp;
size_t chars_needed;
int expscale;
int intdig_max, intdig_no = 0;
@@ -837,7 +671,6 @@ __printf_fp_l (FILE *fp, locale_t loc,
int fracdig_max;
int dig_max;
int significant;
- int ngroups = 0;
char spec = _tolower (info->spec);
if (spec == 'e')
@@ -898,38 +731,32 @@ __printf_fp_l (FILE *fp, locale_t loc,
significant = 0; /* We count significant digits. */
}
- if (grouping)
- {
- /* Guess the number of groups we will make, and thus how
- many spaces we need for separator characters. */
- ngroups = __guess_grouping (intdig_max, grouping);
- /* Allocate one more character in case rounding increases the
- number of groups. */
- chars_needed += ngroups + 1;
- }
-
/* Allocate buffer for output. We need two more because while rounding
it is possible that we need two more characters in front of all the
other output. If the amount of memory we have to allocate is too
large use `malloc' instead of `alloca'. */
- if (__builtin_expect (chars_needed >= (size_t) -1 / sizeof (wchar_t) - 2
- || chars_needed < fracdig_max, 0))
+ if (__glibc_unlikely (chars_needed >= (size_t) -1 - 2
+ || chars_needed < fracdig_max))
{
/* Some overflow occurred. */
__set_errno (ERANGE);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
- size_t wbuffer_to_alloc = (2 + chars_needed) * sizeof (wchar_t);
+ size_t wbuffer_to_alloc = 2 + chars_needed;
buffer_malloced = ! __libc_use_alloca (wbuffer_to_alloc);
if (__builtin_expect (buffer_malloced, 0))
{
- wbuffer = (wchar_t *) malloc (wbuffer_to_alloc);
+ wbuffer = malloc (wbuffer_to_alloc);
if (wbuffer == NULL)
- /* Signal an error to the caller. */
- return -1;
+ {
+ /* Signal an error to the caller. */
+ __printf_buffer_mark_failed (buf);
+ return;
+ }
}
else
- wbuffer = (wchar_t *) alloca (wbuffer_to_alloc);
+ wbuffer = alloca (wbuffer_to_alloc);
wcp = wstartp = wbuffer + 2; /* Let room for rounding. */
/* Do the real work: put digits in allocated buffer. */
@@ -945,15 +772,15 @@ __printf_fp_l (FILE *fp, locale_t loc,
if (info->alt
|| fracdig_min > 0
|| (fracdig_max > 0 && (p.fracsize > 1 || p.frac[0] != 0)))
- *wcp++ = decimalwc;
+ *wcp++ = decimal;
}
else
{
/* |fp| < 1.0 and the selected p.type is 'f', so put "0."
in the buffer. */
- *wcp++ = L'0';
+ *wcp++ = '0';
--p.exponent;
- *wcp++ = decimalwc;
+ *wcp++ = decimal;
}
/* Generate the needed number of fractional digits. */
@@ -964,7 +791,7 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
++fracdig_no;
*wcp = hack_digit (&p);
- if (*wcp++ != L'0')
+ if (*wcp++ != '0')
significant = 1;
else if (significant == 0)
{
@@ -975,10 +802,10 @@ __printf_fp_l (FILE *fp, locale_t loc,
}
/* Do rounding. */
- wchar_t last_digit = wcp[-1] != decimalwc ? wcp[-1] : wcp[-2];
- wchar_t next_digit = hack_digit (&p);
+ char last_digit = wcp[-1] != decimal ? wcp[-1] : wcp[-2];
+ char next_digit = hack_digit (&p);
bool more_bits;
- if (next_digit != L'0' && next_digit != L'5')
+ if (next_digit != '0' && next_digit != '5')
more_bits = true;
else if (p.fracsize == 1 && p.frac[0] == 0)
/* Rest of the number is zero. */
@@ -995,29 +822,29 @@ __printf_fp_l (FILE *fp, locale_t loc,
else
more_bits = true;
int rounding_mode = get_rounding_mode ();
- if (round_away (is_neg, (last_digit - L'0') & 1, next_digit >= L'5',
+ if (round_away (is_neg, (last_digit - '0') & 1, next_digit >= '5',
more_bits, rounding_mode))
{
- wchar_t *wtp = wcp;
+ char *wtp = wcp;
if (fracdig_no > 0)
{
/* Process fractional digits. Terminate if not rounded or
radix character is reached. */
int removed = 0;
- while (*--wtp != decimalwc && *wtp == L'9')
+ while (*--wtp != decimal && *wtp == '9')
{
- *wtp = L'0';
+ *wtp = '0';
++removed;
}
if (removed == fracdig_min && added_zeros > 0)
--added_zeros;
- if (*wtp != decimalwc)
+ if (*wtp != decimal)
/* Round up. */
(*wtp)++;
else if (__builtin_expect (spec == 'g' && p.type == 'f' && info->alt
&& wtp == wstartp + 1
- && wstartp[0] == L'0',
+ && wstartp[0] == '0',
0))
/* This is a special case: the rounded number is 1.0,
the format is 'g' or 'G', and the alternative format
@@ -1025,14 +852,14 @@ __printf_fp_l (FILE *fp, locale_t loc,
--added_zeros;
}
- if (fracdig_no == 0 || *wtp == decimalwc)
+ if (fracdig_no == 0 || *wtp == decimal)
{
/* Round the integer digits. */
- if (*(wtp - 1) == decimalwc)
+ if (*(wtp - 1) == decimal)
--wtp;
- while (--wtp >= wstartp && *wtp == L'9')
- *wtp = L'0';
+ while (--wtp >= wstartp && *wtp == '9')
+ *wtp = '0';
if (wtp >= wstartp)
/* Round up. */
@@ -1056,13 +883,13 @@ __printf_fp_l (FILE *fp, locale_t loc,
/* This is the case where for p.type %g the number fits
really in the range for %f output but after rounding
the number of digits is too big. */
- *--wstartp = decimalwc;
- *--wstartp = L'1';
+ *--wstartp = decimal;
+ *--wstartp = '1';
if (info->alt || fracdig_no > 0)
{
/* Overwrite the old radix character. */
- wstartp[intdig_no + 2] = L'0';
+ wstartp[intdig_no + 2] = '0';
++fracdig_no;
}
@@ -1077,7 +904,7 @@ __printf_fp_l (FILE *fp, locale_t loc,
{
/* We can simply add another another digit before the
radix. */
- *--wstartp = L'1';
+ *--wstartp = '1';
++intdig_no;
}
@@ -1094,28 +921,16 @@ __printf_fp_l (FILE *fp, locale_t loc,
}
/* Now remove unnecessary '0' at the end of the string. */
- while (fracdig_no > fracdig_min + added_zeros && *(wcp - 1) == L'0')
+ while (fracdig_no > fracdig_min + added_zeros && *(wcp - 1) == '0')
{
--wcp;
--fracdig_no;
}
/* If we eliminate all fractional digits we perhaps also can remove
the radix character. */
- if (fracdig_no == 0 && !info->alt && *(wcp - 1) == decimalwc)
+ if (fracdig_no == 0 && !info->alt && *(wcp - 1) == decimal)
--wcp;
- if (grouping)
- {
- /* Rounding might have changed the number of groups. We allocated
- enough memory but we need here the correct number of groups. */
- if (intdig_no != intdig_max)
- ngroups = __guess_grouping (intdig_no, grouping);
-
- /* Add in separator characters, overwriting the same buffer. */
- wcp = group_number (wstartp, wcp, intdig_no, grouping, thousands_sepwc,
- ngroups);
- }
-
/* Write the p.exponent if it is needed. */
if (p.type != 'f')
{
@@ -1125,12 +940,12 @@ __printf_fp_l (FILE *fp, locale_t loc,
really smaller than -4, which requires the 'e'/'E' format.
But after rounding the number has an p.exponent of -4. */
assert (wcp >= wstartp + 1);
- assert (wstartp[0] == L'1');
- __wmemcpy (wstartp, L"0.0001", 6);
- wstartp[1] = decimalwc;
+ assert (wstartp[0] == '1');
+ memcpy (wstartp, "0.0001", 6);
+ wstartp[1] = decimal;
if (wcp >= wstartp + 2)
{
- __wmemset (wstartp + 6, L'0', wcp - (wstartp + 2));
+ memset (wstartp + 6, '0', wcp - (wstartp + 2));
wcp += 4;
}
else
@@ -1138,8 +953,8 @@ __printf_fp_l (FILE *fp, locale_t loc,
}
else
{
- *wcp++ = (wchar_t) p.type;
- *wcp++ = p.expsign ? L'-' : L'+';
+ *wcp++ = p.type;
+ *wcp++ = p.expsign ? '-' : '+';
/* Find the magnitude of the p.exponent. */
expscale = 10;
@@ -1148,220 +963,293 @@ __printf_fp_l (FILE *fp, locale_t loc,
if (p.exponent < 10)
/* Exponent always has at least two digits. */
- *wcp++ = L'0';
+ *wcp++ = '0';
else
do
{
expscale /= 10;
- *wcp++ = L'0' + (p.exponent / expscale);
+ *wcp++ = '0' + (p.exponent / expscale);
p.exponent %= expscale;
}
while (expscale > 10);
- *wcp++ = L'0' + p.exponent;
+ *wcp++ = '0' + p.exponent;
}
}
+ struct grouping_iterator iter;
+ if (thousands_sep != '\0' && info->group)
+ __grouping_iterator_init (&iter, lc_category, loc, intdig_no);
+ else
+ iter.separators = 0;
+
/* Compute number of characters which must be filled with the padding
character. */
if (is_neg || info->showsign || info->space)
--width;
+ /* To count bytes, we would have to use __translated_number_width
+ for info->i18n && !info->wide. See bug 28943. */
width -= wcp - wstartp;
+ /* For counting bytes, we would have to multiply by
+ thousands_sep_length. */
+ width -= iter.separators;
- if (!info->left && info->pad != '0' && width > 0)
- PADN (info->pad, width);
+ if (!info->left && info->pad != '0')
+ __printf_buffer_pad (buf, info->pad, width);
if (is_neg)
- outchar ('-');
+ __printf_buffer_putc (buf, '-');
else if (info->showsign)
- outchar ('+');
+ __printf_buffer_putc (buf, '+');
else if (info->space)
- outchar (' ');
+ __printf_buffer_putc (buf, ' ');
- if (!info->left && info->pad == '0' && width > 0)
- PADN ('0', width);
+ if (!info->left && info->pad == '0')
+ __printf_buffer_pad (buf, '0', width);
- {
- char *buffer_end = NULL;
- char *cp = NULL;
- char *tmpptr;
+ if (iter.separators > 0)
+ {
+ char *cp = wstartp;
+ for (int i = 0; i < intdig_no; ++i)
+ {
+ if (__grouping_iterator_next (&iter))
+ __printf_buffer_putc (buf, thousands_sep);
+ __printf_buffer_putc (buf, *cp);
+ ++cp;
+ }
+ __printf_buffer_write (buf, cp, wcp - cp);
+ }
+ else
+ __printf_buffer_write (buf, wstartp, wcp - wstartp);
- if (! wide)
- {
- /* Create the single byte string. */
- size_t decimal_len;
- size_t thousands_sep_len;
- wchar_t *copywc;
- size_t factor;
- if (info->i18n)
- factor = _nl_lookup_word (loc, LC_CTYPE, _NL_CTYPE_MB_CUR_MAX);
- else
- factor = 1;
+ if (info->left)
+ __printf_buffer_pad (buf, info->pad, width);
+ }
- decimal_len = strlen (decimal);
+ if (buffer_malloced)
+ free (wbuffer);
+}
- if (thousands_sep == NULL)
- thousands_sep_len = 0;
- else
- thousands_sep_len = strlen (thousands_sep);
+/* ASCII to localization translation. Multibyte version. */
+struct __printf_buffer_fp
+{
+ struct __printf_buffer base;
- size_t nbuffer = (2 + chars_needed * factor + decimal_len
- + ngroups * thousands_sep_len);
- if (__glibc_unlikely (buffer_malloced))
- {
- buffer = (char *) malloc (nbuffer);
- if (buffer == NULL)
- {
- /* Signal an error to the caller. */
- free (wbuffer);
- return -1;
- }
- }
- else
- buffer = (char *) alloca (nbuffer);
- buffer_end = buffer + nbuffer;
-
- /* Now copy the wide character string. Since the character
- (except for the decimal point and thousands separator) must
- be coming from the ASCII range we can esily convert the
- string without mapping tables. */
- for (cp = buffer, copywc = wstartp; copywc < wcp; ++copywc)
- if (*copywc == decimalwc)
- cp = (char *) __mempcpy (cp, decimal, decimal_len);
- else if (*copywc == thousands_sepwc)
- cp = (char *) __mempcpy (cp, thousands_sep, thousands_sep_len);
- else
- *cp++ = (char) *copywc;
- }
+ /* Replacement for ',' and '.'. */
+ const char *thousands_sep;
+ const char *decimal;
+ unsigned char decimal_point_bytes;
+ unsigned char thousands_sep_length;
- tmpptr = buffer;
- if (__glibc_unlikely (info->i18n))
- {
-#ifdef COMPILE_WPRINTF
- wstartp = _i18n_number_rewrite (wstartp, wcp,
- wbuffer + wbuffer_to_alloc);
- wcp = wbuffer + wbuffer_to_alloc;
- assert ((uintptr_t) wbuffer <= (uintptr_t) wstartp);
- assert ((uintptr_t) wstartp
- < (uintptr_t) wbuffer + wbuffer_to_alloc);
-#else
- tmpptr = _i18n_number_rewrite (tmpptr, cp, buffer_end);
- cp = buffer_end;
- assert ((uintptr_t) buffer <= (uintptr_t) tmpptr);
- assert ((uintptr_t) tmpptr < (uintptr_t) buffer_end);
-#endif
- }
+ /* Buffer to write to. */
+ struct __printf_buffer *next;
+
+ /* Activates outdigit translation if not NULL. */
+ struct __locale_data *ctype;
- PRINT (tmpptr, wstartp, wide ? wcp - wstartp : cp - tmpptr);
+ /* Buffer to which the untranslated ASCII digits are written. */
+ char untranslated[64];
+};
- /* Free the memory if necessary. */
- if (__glibc_unlikely (buffer_malloced))
+/* Multibyte buffer-to-buffer flush function with full translation. */
+void
+__printf_buffer_flush_fp (struct __printf_buffer_fp *buf)
+{
+ /* No need to update buf->base.written; the actual count is
+ maintained in buf->next->written. */
+ for (char *p = buf->untranslated; p < buf->base.write_ptr; ++p)
+ {
+ char ch = *p;
+ const char *replacement = NULL;
+ unsigned int replacement_bytes;
+ if (ch == ',')
+ {
+ replacement = buf->thousands_sep;
+ replacement_bytes = buf->thousands_sep_length;
+ }
+ else if (ch == '.')
+ {
+ replacement = buf->decimal;
+ replacement_bytes = buf->decimal_point_bytes;
+ }
+ else if (buf->ctype != NULL && '0' <= ch && ch <= '9')
{
- free (buffer);
- free (wbuffer);
- /* Avoid a double free if the subsequent PADN encounters an
- I/O error. */
- buffer = NULL;
- wbuffer = NULL;
+ int digit = ch - '0';
+ replacement
+ = buf->ctype->values[_NL_ITEM_INDEX (_NL_CTYPE_OUTDIGIT0_MB)
+ + digit].string;
+ struct lc_ctype_data *ctype = buf->ctype->private;
+ replacement_bytes = ctype->outdigit_bytes[digit];
}
+ if (replacement == NULL)
+ __printf_buffer_putc (buf->next, ch);
+ else
+ __printf_buffer_write (buf->next, replacement, replacement_bytes);
}
- if (info->left && width > 0)
- PADN (info->pad, width);
- }
- return done;
+ if (!__printf_buffer_has_failed (buf->next))
+ buf->base.write_ptr = buf->untranslated;
+ else
+ __printf_buffer_mark_failed (&buf->base);
}
-libc_hidden_def (__printf_fp_l)
-int
-___printf_fp (FILE *fp, const struct printf_info *info,
- const void *const *args)
+void
+__printf_fp_l_buffer (struct __printf_buffer *buf, locale_t loc,
+ const struct printf_info *info,
+ const void *const *args)
{
- return __printf_fp_l (fp, _NL_CURRENT_LOCALE, info, args);
+ struct __printf_buffer_fp tmp;
+
+ if (info->extra)
+ {
+ tmp.thousands_sep = _nl_lookup (loc, LC_MONETARY, MON_THOUSANDS_SEP);
+ tmp.decimal = _nl_lookup (loc, LC_MONETARY, MON_DECIMAL_POINT);
+ if (tmp.decimal[0] == '\0')
+ tmp.decimal = _nl_lookup (loc, LC_NUMERIC, DECIMAL_POINT);
+ }
+ else
+ {
+ tmp.thousands_sep = _nl_lookup (loc, LC_NUMERIC, THOUSANDS_SEP);
+ tmp.decimal = _nl_lookup (loc, LC_NUMERIC, DECIMAL_POINT);
+ }
+
+ tmp.thousands_sep_length = strlen (tmp.thousands_sep);
+ if (tmp.decimal[1] == '\0' && tmp.thousands_sep_length <= 1
+ && !info->i18n)
+ {
+ /* Emit the the characters directly. This is only possible if the
+ separators have length 1 (or 0 in case of thousands_sep). i18n
+ digit translation still needs the full conversion. */
+ __printf_fp_buffer_1 (buf, loc,
+ tmp.thousands_sep[0], tmp.decimal[0],
+ tmp.thousands_sep_length,
+ info, args);
+ return;
+ }
+
+ tmp.decimal_point_bytes = strlen (tmp.decimal);
+
+ if (info->i18n)
+ tmp.ctype = loc->__locales[LC_CTYPE];
+ else
+ tmp.ctype = NULL;
+ tmp.next = buf;
+
+ __printf_buffer_init (&tmp.base, tmp.untranslated, sizeof (tmp.untranslated),
+ __printf_buffer_mode_fp);
+ __printf_fp_buffer_1 (&tmp.base, loc, ',', '.',
+ tmp.thousands_sep_length, info, args);
+ if (__printf_buffer_has_failed (&tmp.base))
+ {
+ __printf_buffer_mark_failed (tmp.next);
+ return;
+ }
+ __printf_buffer_flush_fp (&tmp);
}
-ldbl_hidden_def (___printf_fp, __printf_fp)
-ldbl_strong_alias (___printf_fp, __printf_fp)
-\f
-/* Return the number of extra grouping characters that will be inserted
- into a number with INTDIG_MAX integer digits. */
+/* The wide version is implemented on top of the multibyte version using
+ translation. */
-unsigned int
-__guess_grouping (unsigned int intdig_max, const char *grouping)
+struct __printf_buffer_fp_to_wide
{
- unsigned int groups;
+ struct __printf_buffer base;
+ wchar_t thousands_sep_wc;
+ wchar_t decimalwc;
+ struct __wprintf_buffer *next;
- /* We treat all negative values like CHAR_MAX. */
+ /* Activates outdigit translation if not NULL. */
+ struct __locale_data *ctype;
- if (*grouping == CHAR_MAX || *grouping <= 0)
- /* No grouping should be done. */
- return 0;
+ char untranslated[64];
+};
- groups = 0;
- while (intdig_max > (unsigned int) *grouping)
+void
+__printf_buffer_flush_fp_to_wide (struct __printf_buffer_fp_to_wide *buf)
+{
+ /* No need to update buf->base.written; the actual count is
+ maintained in buf->next->written. */
+ for (char *p = buf->untranslated; p < buf->base.write_ptr; ++p)
{
- ++groups;
- intdig_max -= *grouping++;
-
- if (*grouping == CHAR_MAX
-#if CHAR_MIN < 0
- || *grouping < 0
-#endif
- )
- /* No more grouping should be done. */
- break;
- else if (*grouping == 0)
+ /* wchar_t overlaps with char in the ASCII range. */
+ wchar_t ch = *p;
+ if (ch == L',')
{
- /* Same grouping repeats. */
- groups += (intdig_max - 1) / grouping[-1];
- break;
+ ch = buf->thousands_sep_wc;
+ if (ch == 0)
+ continue;
}
+ else if (ch == L'.')
+ ch = buf->decimalwc;
+ else if (buf->ctype != NULL && L'0' <= ch && ch <= L'9')
+ ch = buf->ctype->values[_NL_ITEM_INDEX (_NL_CTYPE_OUTDIGIT0_WC)
+ + ch - L'0'].word;
+ __wprintf_buffer_putc (buf->next, ch);
}
- return groups;
+ if (!__wprintf_buffer_has_failed (buf->next))
+ buf->base.write_ptr = buf->untranslated;
+ else
+ __printf_buffer_mark_failed (&buf->base);
}
-/* Group the INTDIG_NO integer digits of the number in [BUF,BUFEND).
- There is guaranteed enough space past BUFEND to extend it.
- Return the new end of buffer. */
-
-static wchar_t *
-group_number (wchar_t *buf, wchar_t *bufend, unsigned int intdig_no,
- const char *grouping, wchar_t thousands_sep, int ngroups)
+void
+__wprintf_fp_l_buffer (struct __wprintf_buffer *buf, locale_t loc,
+ const struct printf_info *info,
+ const void *const *args)
{
- wchar_t *p;
-
- if (ngroups == 0)
- return bufend;
+ struct __printf_buffer_fp_to_wide tmp;
+ if (info->extra)
+ {
+ tmp.decimalwc = _nl_lookup_word (loc, LC_MONETARY,
+ _NL_MONETARY_DECIMAL_POINT_WC);
+ tmp.thousands_sep_wc = _nl_lookup_word (loc, LC_MONETARY,
+ _NL_MONETARY_THOUSANDS_SEP_WC);
+ if (tmp.decimalwc == 0)
+ tmp.decimalwc = _nl_lookup_word (loc, LC_NUMERIC,
+ _NL_NUMERIC_DECIMAL_POINT_WC);
+ }
+ else
+ {
+ tmp.decimalwc = _nl_lookup_word (loc, LC_NUMERIC,
+ _NL_NUMERIC_DECIMAL_POINT_WC);
+ tmp.thousands_sep_wc = _nl_lookup_word (loc, LC_NUMERIC,
+ _NL_NUMERIC_THOUSANDS_SEP_WC);
+ }
- /* Move the fractional part down. */
- __wmemmove (buf + intdig_no + ngroups, buf + intdig_no,
- bufend - (buf + intdig_no));
+ if (info->i18n)
+ tmp.ctype = loc->__locales[LC_CTYPE];
+ else
+ tmp.ctype = NULL;
+ tmp.next = buf;
- p = buf + intdig_no + ngroups - 1;
- do
+ __printf_buffer_init (&tmp.base, tmp.untranslated, sizeof (tmp.untranslated),
+ __printf_buffer_mode_fp_to_wide);
+ __printf_fp_buffer_1 (&tmp.base, loc, ',', '.', 1, info, args);
+ if (__printf_buffer_has_failed (&tmp.base))
{
- unsigned int len = *grouping++;
- do
- *p-- = buf[--intdig_no];
- while (--len > 0);
- *p-- = thousands_sep;
+ __wprintf_buffer_mark_failed (tmp.next);
+ return;
+ }
+ __printf_buffer_flush (&tmp.base);
+}
- if (*grouping == CHAR_MAX
-#if CHAR_MIN < 0
- || *grouping < 0
-#endif
- )
- /* No more grouping should be done. */
- break;
- else if (*grouping == 0)
- /* Same grouping repeats. */
- --grouping;
- } while (intdig_no > (unsigned int) *grouping);
-
- /* Copy the remaining ungrouped digits. */
- do
- *p-- = buf[--intdig_no];
- while (p > buf);
-
- return bufend + ngroups;
+int
+___printf_fp (FILE *fp, const struct printf_info *info,
+ const void *const *args)
+{
+ if (info->wide)
+ {
+ struct __wprintf_buffer_to_file buf;
+ __wprintf_buffer_to_file_init (&buf, fp);
+ __wprintf_fp_l_buffer (&buf.base, _NL_CURRENT_LOCALE, info, args);
+ return __wprintf_buffer_to_file_done (&buf);
+ }
+ else
+ {
+ struct __printf_buffer_to_file buf;
+ __printf_buffer_to_file_init (&buf, fp);
+ __printf_fp_l_buffer (&buf.base, _NL_CURRENT_LOCALE, info, args);
+ return __printf_buffer_to_file_done (&buf);
+ }
}
+ldbl_hidden_def (___printf_fp, __printf_fp)
+ldbl_strong_alias (___printf_fp, __printf_fp)
diff --git a/stdio-common/printf_fphex.c b/stdio-common/printf_fphex.c
index 5af380da62..957796f00b 100644
--- a/stdio-common/printf_fphex.c
+++ b/stdio-common/printf_fphex.c
@@ -17,10 +17,12 @@
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
+#include <assert.h>
#include <ctype.h>
#include <ieee754.h>
#include <math.h>
#include <printf.h>
+#include <libioP.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
@@ -30,6 +32,9 @@
#include <locale/localeinfo.h>
#include <stdbool.h>
#include <rounding-mode.h>
+#include <sys/param.h>
+#include <printf_buffer.h>
+#include <errno.h>
#if __HAVE_DISTINCT_FLOAT128
# include "ieee754_float128.h"
@@ -39,58 +44,11 @@
IEEE854_FLOAT128_BIAS)
#endif
-/* #define NDEBUG 1*/ /* Undefine this for debugging assertions. */
-#include <assert.h>
-
-#include <libioP.h>
-#define PUT(f, s, n) _IO_sputn (f, s, n)
-#define PAD(f, c, n) (wide ? _IO_wpadn (f, c, n) : _IO_padn (f, c, n))
-#undef putc
-#define putc(c, f) (wide \
- ? (int)_IO_putwc_unlocked (c, f) : _IO_putc_unlocked (c, f))
-
-\f
-/* Macros for doing the actual output. */
-
-#define outchar(ch) \
- do \
- { \
- const int outc = (ch); \
- if (putc (outc, fp) == EOF) \
- return -1; \
- ++done; \
- } while (0)
-
-#define PRINT(ptr, wptr, len) \
- do \
- { \
- size_t outlen = (len); \
- if (wide) \
- while (outlen-- > 0) \
- outchar (*wptr++); \
- else \
- while (outlen-- > 0) \
- outchar (*ptr++); \
- } while (0)
-
-#define PADN(ch, len) \
- do \
- { \
- if (PAD (fp, ch, len) != len) \
- return -1; \
- done += len; \
- } \
- while (0)
-
-#ifndef MIN
-# define MIN(a,b) ((a)<(b)?(a):(b))
-#endif
-\f
-
-int
-__printf_fphex (FILE *fp,
- const struct printf_info *info,
- const void *const *args)
+static void
+__printf_fphex_buffer (struct __printf_buffer *buf,
+ const char *decimal,
+ const struct printf_info *info,
+ const void *const *args)
{
/* The floating-point value to output. */
union
@@ -106,34 +64,19 @@ __printf_fphex (FILE *fp,
/* This function always uses LC_NUMERIC. */
assert (info->extra == 0);
- /* Locale-dependent representation of decimal point. Hexadecimal
- formatting always using LC_NUMERIC (disregarding info->extra). */
- const char *decimal = _NL_CURRENT (LC_NUMERIC, DECIMAL_POINT);
- wchar_t decimalwc = _NL_CURRENT_WORD (LC_NUMERIC,
- _NL_NUMERIC_DECIMAL_POINT_WC);
-
- /* The decimal point character must never be zero. */
- assert (*decimal != '\0' && decimalwc != L'\0');
-
/* "NaN" or "Inf" for the special cases. */
const char *special = NULL;
- const wchar_t *wspecial = NULL;
/* Buffer for the generated number string for the mantissa. The
maximal size for the mantissa is 128 bits. */
char numbuf[32];
char *numstr;
char *numend;
- wchar_t wnumbuf[32];
- wchar_t *wnumstr;
- wchar_t *wnumend;
int negative;
/* The maximal exponent of two in decimal notation has 5 digits. */
char expbuf[5];
char *expstr;
- wchar_t wexpbuf[5];
- wchar_t *wexpstr;
int expnegative;
int exponent;
@@ -149,12 +92,6 @@ __printf_fphex (FILE *fp,
/* Width. */
int width = info->width;
- /* Number of characters written. */
- int done = 0;
-
- /* Nonzero if this is output on a wide character stream. */
- int wide = info->wide;
-
#define PRINTF_FPHEX_FETCH(FLOAT, VAR) \
{ \
(VAR) = *(const FLOAT *) args[0]; \
@@ -163,30 +100,18 @@ __printf_fphex (FILE *fp,
if (isnan (VAR)) \
{ \
if (isupper (info->spec)) \
- { \
- special = "NAN"; \
- wspecial = L"NAN"; \
- } \
+ special = "NAN"; \
else \
- { \
- special = "nan"; \
- wspecial = L"nan"; \
- } \
+ special = "nan"; \
} \
else \
{ \
if (isinf (VAR)) \
{ \
if (isupper (info->spec)) \
- { \
- special = "INF"; \
- wspecial = L"INF"; \
- } \
+ special = "INF"; \
else \
- { \
- special = "inf"; \
- wspecial = L"inf"; \
- } \
+ special = "inf"; \
} \
} \
negative = signbit (VAR); \
@@ -215,22 +140,22 @@ __printf_fphex (FILE *fp,
--width;
width -= 3;
- if (!info->left && width > 0)
- PADN (' ', width);
+ if (!info->left)
+ __printf_buffer_pad (buf, ' ', width);
if (negative)
- outchar ('-');
+ __printf_buffer_putc (buf, '-');
else if (info->showsign)
- outchar ('+');
+ __printf_buffer_putc (buf, '+');
else if (info->space)
- outchar (' ');
+ __printf_buffer_putc (buf, ' ');
- PRINT (special, wspecial, 3);
+ __printf_buffer_puts (buf, special);
- if (info->left && width > 0)
- PADN (' ', width);
+ if (info->left)
+ __printf_buffer_pad (buf, ' ', width);
- return done;
+ return;
}
#if __HAVE_DISTINCT_FLOAT128
@@ -252,26 +177,15 @@ __printf_fphex (FILE *fp,
zero_mantissa = num == 0;
if (sizeof (unsigned long int) > 6)
- {
- wnumstr = _itowa_word (num, wnumbuf + (sizeof wnumbuf) / sizeof (wchar_t), 16,
- info->spec == 'A');
numstr = _itoa_word (num, numbuf + sizeof numbuf, 16,
info->spec == 'A');
- }
else
- {
- wnumstr = _itowa (num, wnumbuf + sizeof wnumbuf / sizeof (wchar_t), 16,
- info->spec == 'A');
numstr = _itoa (num, numbuf + sizeof numbuf, 16,
info->spec == 'A');
- }
/* Fill with zeroes. */
- while (wnumstr > wnumbuf + (sizeof wnumbuf - 52) / sizeof (wchar_t))
- {
- *--wnumstr = L'0';
- *--numstr = '0';
- }
+ while (numstr > numbuf + (sizeof numbuf - 13))
+ *--numstr = '0';
leading = fpnum.dbl.ieee.exponent == 0 ? '0' : '1';
@@ -307,13 +221,9 @@ __printf_fphex (FILE *fp,
/* Look for trailing zeroes. */
if (! zero_mantissa)
{
- wnumend = array_end (wnumbuf);
numend = array_end (numbuf);
- while (wnumend[-1] == L'0')
- {
- --wnumend;
+ while (numend[-1] == '0')
--numend;
- }
bool do_round_away = false;
@@ -352,7 +262,6 @@ __printf_fphex (FILE *fp,
like in ASCII. This is true for the rest of GNU, too. */
if (ch == '9')
{
- wnumstr[cnt] = (wchar_t) info->spec;
numstr[cnt] = info->spec; /* This is tricky,
think about it! */
break;
@@ -360,14 +269,10 @@ __printf_fphex (FILE *fp,
else if (tolower (ch) < 'f')
{
++numstr[cnt];
- ++wnumstr[cnt];
break;
}
else
- {
- numstr[cnt] = '0';
- wnumstr[cnt] = L'0';
- }
+ numstr[cnt] = '0';
}
if (cnt < 0)
{
@@ -401,13 +306,10 @@ __printf_fphex (FILE *fp,
if (precision == -1)
precision = 0;
numend = numstr;
- wnumend = wnumstr;
}
/* Now we can compute the exponent string. */
expstr = _itoa_word (exponent, expbuf + sizeof expbuf, 10, 0);
- wexpstr = _itowa_word (exponent,
- wexpbuf + sizeof wexpbuf / sizeof (wchar_t), 10, 0);
/* Now we have all information to compute the size. */
width -= ((negative || info->showsign || info->space)
@@ -421,54 +323,110 @@ __printf_fphex (FILE *fp,
A special case when the mantissa or the precision is zero and the `#'
is not given. In this case we must not print the decimal point. */
if (precision > 0 || info->alt)
- width -= wide ? 1 : strlen (decimal);
+ --width;
- if (!info->left && info->pad != '0' && width > 0)
- PADN (' ', width);
+ if (!info->left && info->pad != '0')
+ __printf_buffer_pad (buf, ' ', width);
if (negative)
- outchar ('-');
+ __printf_buffer_putc (buf, '-');
else if (info->showsign)
- outchar ('+');
+ __printf_buffer_putc (buf, '+');
else if (info->space)
- outchar (' ');
+ __printf_buffer_putc (buf, ' ');
- outchar ('0');
+ __printf_buffer_putc (buf, '0');
if ('X' - 'A' == 'x' - 'a')
- outchar (info->spec + ('x' - 'a'));
+ __printf_buffer_putc (buf, info->spec + ('x' - 'a'));
else
- outchar (info->spec == 'A' ? 'X' : 'x');
+ __printf_buffer_putc (buf, info->spec == 'A' ? 'X' : 'x');
- if (!info->left && info->pad == '0' && width > 0)
- PADN ('0', width);
+ if (!info->left && info->pad == '0')
+ __printf_buffer_pad (buf, '0', width);
- outchar (leading);
+ __printf_buffer_putc (buf, leading);
if (precision > 0 || info->alt)
- {
- const wchar_t *wtmp = &decimalwc;
- PRINT (decimal, wtmp, wide ? 1 : strlen (decimal));
- }
+ __printf_buffer_puts (buf, decimal);
if (precision > 0)
{
ssize_t tofill = precision - (numend - numstr);
- PRINT (numstr, wnumstr, MIN (numend - numstr, precision));
- if (tofill > 0)
- PADN ('0', tofill);
+ __printf_buffer_write (buf, numstr, MIN (numend - numstr, precision));
+ __printf_buffer_pad (buf, '0', tofill);
}
if ('P' - 'A' == 'p' - 'a')
- outchar (info->spec + ('p' - 'a'));
+ __printf_buffer_putc (buf, info->spec + ('p' - 'a'));
else
- outchar (info->spec == 'A' ? 'P' : 'p');
+ __printf_buffer_putc (buf, info->spec == 'A' ? 'P' : 'p');
+
+ __printf_buffer_putc (buf, expnegative ? '-' : '+');
+
+ __printf_buffer_write (buf, expstr, (expbuf + sizeof expbuf) - expstr);
+
+ if (info->left && info->pad != '0')
+ __printf_buffer_pad (buf, info->pad, width);
+}
+
+void
+__printf_fphex_l_buffer (struct __printf_buffer *buf, locale_t loc,
+ const struct printf_info *info,
+ const void *const *args)
+{
+ __printf_fphex_buffer (buf, _nl_lookup (loc, LC_NUMERIC, DECIMAL_POINT),
+ info, args);
+}
- outchar (expnegative ? '-' : '+');
- PRINT (expstr, wexpstr, (expbuf + sizeof expbuf) - expstr);
+/* The wide buffer version is implemented by translating the output of
+ the multibyte verison. */
- if (info->left && info->pad != '0' && width > 0)
- PADN (info->pad, width);
+struct __printf_buffer_fphex_to_wide
+{
+ struct __printf_buffer base;
+ wchar_t decimalwc;
+ struct __wprintf_buffer *next;
+ char untranslated[64];
+};
+
+/* Translate to wide characters, rewriting "." to the actual decimal
+ point. */
+void
+__printf_buffer_flush_fphex_to_wide (struct __printf_buffer_fphex_to_wide *buf)
+{
+ /* No need to adjust buf->base.written, only buf->next->written matters. */
+ for (char *p = buf->untranslated; p < buf->base.write_ptr; ++p)
+ {
+ /* wchar_t overlaps with char in the ASCII range. */
+ wchar_t ch = *p;
+ if (ch == L'.')
+ ch = buf->decimalwc;
+ __wprintf_buffer_putc (buf->next, ch);
+ }
- return done;
+ if (!__wprintf_buffer_has_failed (buf->next))
+ buf->base.write_ptr = buf->untranslated;
+ else
+ __printf_buffer_mark_failed (&buf->base);
+}
+
+void
+__wprintf_fphex_l_buffer (struct __wprintf_buffer *next, locale_t loc,
+ const struct printf_info *info,
+ const void *const *args)
+{
+ struct __printf_buffer_fphex_to_wide buf;
+ __printf_buffer_init (&buf.base, buf.untranslated, sizeof (buf.untranslated),
+ __printf_buffer_mode_fphex_to_wide);
+ buf.decimalwc = _nl_lookup_word (loc, LC_NUMERIC,
+ _NL_NUMERIC_DECIMAL_POINT_WC);
+ buf.next = next;
+ __printf_fphex_buffer (&buf.base, ".", info, args);
+ if (__printf_buffer_has_failed (&buf.base))
+ {
+ __wprintf_buffer_mark_failed (buf.next);
+ return;
+ }
+ __printf_buffer_flush_fphex_to_wide (&buf);
}
diff --git a/stdio-common/vfprintf-internal.c b/stdio-common/vfprintf-internal.c
index fb94961f37..83a6aea510 100644
--- a/stdio-common/vfprintf-internal.c
+++ b/stdio-common/vfprintf-internal.c
@@ -16,6 +16,7 @@
<https://www.gnu.org/licenses/>. */
#include <array_length.h>
+#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <printf.h>
@@ -29,9 +30,12 @@
#include <sys/param.h>
#include <_itoa.h>
#include <locale/localeinfo.h>
+#include <grouping_iterator.h>
#include <stdio.h>
#include <scratch_buffer.h>
#include <intprops.h>
+#include <printf_buffer.h>
+#include <printf_buffer_to_file.h>
/* This code is shared between the standard stdio implementation found
in GNU C library and the libio implementation originally found in
@@ -47,21 +51,21 @@
#endif
#define ARGCHECK(S, Format) \
- do \
- { \
- /* Check file argument for consistence. */ \
- CHECK_FILE (S, -1); \
- if (S->_flags & _IO_NO_WRITES) \
- { \
- S->_flags |= _IO_ERR_SEEN; \
- __set_errno (EBADF); \
- return -1; \
- } \
- if (Format == NULL) \
- { \
- __set_errno (EINVAL); \
- return -1; \
- } \
+ do \
+ { \
+ /* Check file argument for consistence. */ \
+ CHECK_FILE (S, -1); \
+ if (S->_flags & _IO_NO_WRITES) \
+ { \
+ S->_flags |= _IO_ERR_SEEN; \
+ __set_errno (EBADF); \
+ return -1; \
+ } \
+ if (Format == NULL) \
+ { \
+ __set_errno (EINVAL); \
+ return -1; \
+ } \
} while (0)
#define UNBUFFERED_P(S) ((S)->_flags & _IO_UNBUFFERED)
@@ -116,37 +120,9 @@
while (0)
#endif
-/* Add LENGTH to DONE. Return the new value of DONE, or -1 on
- overflow (and set errno accordingly). */
-static inline int
-done_add_func (size_t length, int done)
-{
- if (done < 0)
- return done;
- int ret;
- if (INT_ADD_WRAPV (done, length, &ret))
- {
- __set_errno (EOVERFLOW);
- return -1;
- }
- return ret;
-}
-
-#define done_add(val) \
- do \
- { \
- /* Ensure that VAL has a type similar to int. */ \
- _Static_assert (sizeof (val) == sizeof (int), "value int size"); \
- _Static_assert ((__typeof__ (val)) -1 < 0, "value signed"); \
- done = done_add_func ((val), done); \
- if (done < 0) \
- goto all_done; \
- } \
- while (0)
-
#ifndef COMPILE_WPRINTF
+# include "printf_buffer-char.h"
# define vfprintf __vfprintf_internal
-# define CHAR_T char
# define OTHER_CHAR_T wchar_t
# define UCHAR_T unsigned char
# define INT_T int
@@ -155,14 +131,12 @@ typedef const char *THOUSANDS_SEP_T;
# define ISDIGIT(Ch) ((unsigned int) ((Ch) - '0') < 10)
# define STR_LEN(Str) strlen (Str)
-# define PUT(F, S, N) _IO_sputn ((F), (S), (N))
-# define PUTC(C, F) _IO_putc_unlocked (C, F)
# define ORIENT if (_IO_vtable_offset (s) == 0 && _IO_fwide (s, -1) != -1)\
return -1
# define CONVERT_FROM_OTHER_STRING __wcsrtombs
#else
+# include "printf_buffer-wchar_t.h"
# define vfprintf __vfwprintf_internal
-# define CHAR_T wchar_t
# define OTHER_CHAR_T char
/* This is a hack!!! There should be a type uwchar_t. */
# define UCHAR_T unsigned int /* uwchar_t */
@@ -174,8 +148,6 @@ typedef wchar_t THOUSANDS_SEP_T;
# include <_itowa.h>
-# define PUT(F, S, N) _IO_sputn ((F), (S), (N))
-# define PUTC(C, F) _IO_putwc_unlocked (C, F)
# define ORIENT if (_IO_fwide (s, 1) != 1) return -1
# define CONVERT_FROM_OTHER_STRING __mbsrtowcs
@@ -186,76 +158,16 @@ typedef wchar_t THOUSANDS_SEP_T;
# define EOF WEOF
#endif
-static inline int
-pad_func (FILE *s, CHAR_T padchar, int width, int done)
-{
- if (width > 0)
- {
- ssize_t written;
-#ifndef COMPILE_WPRINTF
- written = _IO_padn (s, padchar, width);
-#else
- written = _IO_wpadn (s, padchar, width);
-#endif
- if (__glibc_unlikely (written != width))
- return -1;
- return done_add_func (width, done);
- }
- return done;
-}
-
-#define PAD(Padchar) \
- do \
- { \
- done = pad_func (s, (Padchar), width, done); \
- if (done < 0) \
- goto all_done; \
- } \
- while (0)
-
-#include "_i18n_number.h"
-
/* Include the shared code for parsing the format string. */
#include "printf-parse.h"
-#define outchar(Ch) \
- do \
- { \
- const INT_T outc = (Ch); \
- if (PUTC (outc, s) == EOF || done == INT_MAX) \
- { \
- done = -1; \
- goto all_done; \
- } \
- ++done; \
- } \
- while (0)
-
-static inline int
-outstring_func (FILE *s, const UCHAR_T *string, size_t length, int done)
-{
- assert ((size_t) done <= (size_t) INT_MAX);
- if ((size_t) PUT (s, string, length) != (size_t) (length))
- return -1;
- return done_add_func (length, done);
-}
-
-#define outstring(String, Len) \
- do \
- { \
- const void *string_ = (String); \
- done = outstring_func (s, string_, (Len), done); \
- if (done < 0) \
- goto all_done; \
- } \
- while (0)
-
/* Write the string SRC to S. If PREC is non-negative, write at most
PREC bytes. If LEFT is true, perform left justification. */
-static int
-outstring_converted_wide_string (FILE *s, const OTHER_CHAR_T *src, int prec,
- int width, bool left, int done)
+static void
+outstring_converted_wide_string (struct Xprintf_buffer *target,
+ const OTHER_CHAR_T *src, int prec,
+ int width, bool left)
{
/* Use a small buffer to combine processing of multiple characters.
CONVERT_FROM_OTHER_STRING expects the buffer size in (wide)
@@ -290,7 +202,10 @@ outstring_converted_wide_string (FILE *s, const OTHER_CHAR_T *src, int prec,
size_t written = CONVERT_FROM_OTHER_STRING
(buf, &src_copy, write_limit, &mbstate);
if (written == (size_t) -1)
- return -1;
+ {
+ Xprintf_buffer_mark_failed (target);
+ return;
+ }
if (written == 0)
break;
total_written += written;
@@ -299,12 +214,9 @@ outstring_converted_wide_string (FILE *s, const OTHER_CHAR_T *src, int prec,
}
/* Output initial padding. */
- if (total_written < width)
- {
- done = pad_func (s, L_(' '), width - total_written, done);
- if (done < 0)
- return done;
- }
+ Xprintf_buffer_pad (target, L_(' '), width - total_written);
+ if (Xprintf_buffer_has_failed (target))
+ return;
}
/* Convert the input string, piece by piece. */
@@ -324,12 +236,13 @@ outstring_converted_wide_string (FILE *s, const OTHER_CHAR_T *src, int prec,
size_t written = CONVERT_FROM_OTHER_STRING
(buf, &src, write_limit, &mbstate);
if (written == (size_t) -1)
- return -1;
+ {
+ Xprintf_buffer_mark_failed (target);
+ return;
+ }
if (written == 0)
break;
- done = outstring_func (s, (const UCHAR_T *) buf, written, done);
- if (done < 0)
- return done;
+ Xprintf_buffer_write (target, buf, written);
total_written += written;
if (prec >= 0)
remaining -= written;
@@ -337,21 +250,20 @@ outstring_converted_wide_string (FILE *s, const OTHER_CHAR_T *src, int prec,
}
/* Add final padding. */
- if (width > 0 && left && total_written < width)
- return pad_func (s, L_(' '), width - total_written, done);
- return done;
+ if (width > 0 && left)
+ Xprintf_buffer_pad (target, L_(' '), width - total_written);
}
/* Calls __printf_fp or __printf_fphex based on the value of the
format specifier INFO->spec. */
-static inline int
-__printf_fp_spec (FILE *fp, const struct printf_info *info,
- const void *const *args)
+static inline void
+__printf_fp_spec (struct Xprintf_buffer *target,
+ const struct printf_info *info, const void *const *args)
{
if (info->spec == 'a' || info->spec == 'A')
- return __printf_fphex (fp, info, args);
+ Xprintf (fphex_l_buffer) (target, _NL_CURRENT_LOCALE, info, args);
else
- return __printf_fp (fp, info, args);
+ Xprintf (fp_l_buffer) (target, _NL_CURRENT_LOCALE, info, args);
}
/* For handling long_double and longlong we use the same flag. If
@@ -656,31 +568,29 @@ static const uint8_t jump_table[] =
REF (form_binary), /* for 'B', 'b' */ \
}
-/* Helper function to provide temporary buffering for unbuffered streams. */
-static int buffered_vfprintf (FILE *stream, const CHAR_T *fmt, va_list,
- unsigned int)
- __THROW __attribute__ ((noinline));
-
/* Handle positional format specifiers. */
-static int printf_positional (FILE *s,
- const CHAR_T *format, int readonly_format,
- va_list ap, va_list *ap_savep, int done,
- int nspecs_done, const UCHAR_T *lead_str_end,
- CHAR_T *work_buffer, int save_errno,
- const char *grouping,
- THOUSANDS_SEP_T thousands_sep,
- unsigned int mode_flags);
+static void printf_positional (struct Xprintf_buffer *buf,
+ const CHAR_T *format, int readonly_format,
+ va_list ap, va_list *ap_savep,
+ int nspecs_done, const UCHAR_T *lead_str_end,
+ CHAR_T *work_buffer, int save_errno,
+ const char *grouping,
+ THOUSANDS_SEP_T thousands_sep,
+ unsigned int mode_flags);
/* Handle unknown format specifier. */
-static int printf_unknown (FILE *, const struct printf_info *) __THROW;
-
-/* Group digits of number string. */
-static CHAR_T *group_number (CHAR_T *, CHAR_T *, CHAR_T *, const char *,
- THOUSANDS_SEP_T);
-
-/* The function itself. */
-int
-vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
+static void printf_unknown (struct Xprintf_buffer *,
+ const struct printf_info *) __THROW;
+
+static void group_number (struct Xprintf_buffer *buf,
+ struct grouping_iterator *iter,
+ CHAR_T *from, CHAR_T *to,
+ THOUSANDS_SEP_T thousands_sep, bool i18n);
+
+/* The buffer-based function itself. */
+void
+Xprintf_buffer (struct Xprintf_buffer *buf, const CHAR_T *format,
+ va_list ap, unsigned int mode_flags)
{
/* The character used as thousands separator. */
THOUSANDS_SEP_T thousands_sep = 0;
@@ -688,9 +598,6 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
/* The string describing the size of groups of digits. */
const char *grouping;
- /* Place to accumulate the result. */
- int done;
-
/* Current character in format string. */
const UCHAR_T *f;
@@ -717,30 +624,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
0 if unknown. */
int readonly_format = 0;
- /* Orient the stream. */
-#ifdef ORIENT
- ORIENT;
-#endif
-
- /* Sanity check of arguments. */
- ARGCHECK (s, format);
-
-#ifdef ORIENT
- /* Check for correct orientation. */
- if (_IO_vtable_offset (s) == 0
- && _IO_fwide (s, sizeof (CHAR_T) == 1 ? -1 : 1)
- != (sizeof (CHAR_T) == 1 ? -1 : 1))
- /* The stream is already oriented otherwise. */
- return EOF;
-#endif
-
- if (UNBUFFERED_P (s))
- /* Use a helper function which will allocate a local temporary buffer
- for the stream and then call us again. */
- return buffered_vfprintf (s, format, ap, mode_flags);
-
/* Initialize local variables. */
- done = 0;
grouping = (const char *) -1;
#ifdef __va_copy
/* This macro will be available soon in gcc's <stdarg.h>. We need it
@@ -759,17 +643,15 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
f = lead_str_end = __find_specmb ((const UCHAR_T *) format);
#endif
- /* Lock stream. */
- _IO_cleanup_region_start ((void (*) (void *)) &_IO_funlockfile, s);
- _IO_flockfile (s);
-
/* Write the literal text before the first format. */
- outstring ((const UCHAR_T *) format,
- lead_str_end - (const UCHAR_T *) format);
+ Xprintf_buffer_write (buf, format,
+ lead_str_end - (const UCHAR_T *) format);
+ if (Xprintf_buffer_has_failed (buf))
+ return;
/* If we only have to print a simple string, return now. */
if (*f == L_('\0'))
- goto all_done;
+ return;
/* Use the slow path in case any printf handler is registered. */
if (__glibc_unlikely (__printf_function_table != NULL
@@ -885,7 +767,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
if (pos == -1)
{
__set_errno (EOVERFLOW);
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
@@ -912,7 +794,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
if (__glibc_unlikely (width == -1))
{
__set_errno (EOVERFLOW);
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
@@ -935,7 +817,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
if (pos == -1)
{
__set_errno (EOVERFLOW);
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
@@ -958,7 +840,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
if (prec == -1)
{
__set_errno (EOVERFLOW);
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
}
@@ -1058,13 +940,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
PARSE_FLOAT_VA_ARG_EXTENDED (info);
const void *ptr = &the_arg;
- int function_done = __printf_fp_spec (s, &info, &ptr);
- if (function_done < 0)
- {
- done = -1;
- goto all_done;
- }
- done_add (function_done);
+ __printf_fp_spec (buf, &info, &ptr);
}
break;
@@ -1073,7 +949,7 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
{
/* The format string ended before the specifier is complete. */
__set_errno (EINVAL);
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
@@ -1093,30 +969,28 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
#endif
/* Write the following constant string. */
- outstring (end_of_spec, f - end_of_spec);
+ Xprintf_buffer_write (buf, (const CHAR_T *) end_of_spec,
+ f - end_of_spec);
}
- while (*f != L_('\0'));
+ while (*f != L_('\0') && !Xprintf_buffer_has_failed (buf));
- /* Unlock stream and return. */
- goto all_done;
+ all_done:
+ /* printf_positional performs cleanup under its all_done label, so
+ vfprintf-process-arg.c uses it for this function and
+ printf_positional below. */
+ return;
/* Hand off processing for positional parameters. */
do_positional:
- done = printf_positional (s, format, readonly_format, ap, &ap_save,
- done, nspecs_done, lead_str_end, work_buffer,
- save_errno, grouping, thousands_sep, mode_flags);
-
- all_done:
- /* Unlock the stream. */
- _IO_funlockfile (s);
- _IO_cleanup_region_end (0);
-
- return done;
+ printf_positional (buf, format, readonly_format, ap, &ap_save,
+ nspecs_done, lead_str_end, work_buffer,
+ save_errno, grouping, thousands_sep, mode_flags);
}
\f
-static int
-printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
- va_list ap, va_list *ap_savep, int done, int nspecs_done,
+static void
+printf_positional (struct Xprintf_buffer * buf, const CHAR_T *format,
+ int readonly_format,
+ va_list ap, va_list *ap_savep, int nspecs_done,
const UCHAR_T *lead_str_end,
CHAR_T *work_buffer, int save_errno,
const char *grouping, THOUSANDS_SEP_T thousands_sep,
@@ -1171,7 +1045,7 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
{
if (!scratch_buffer_grow_preserve (&specsbuf))
{
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
specs = specsbuf.data;
@@ -1199,7 +1073,7 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
= sizeof (*args_value) + sizeof (*args_size) + sizeof (*args_type);
if (!scratch_buffer_set_array_size (&argsbuf, nargs, bytes_per_arg))
{
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
args_value = argsbuf.data;
@@ -1312,7 +1186,8 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
}
/* Now walk through all format specifiers and process them. */
- for (; (size_t) nspecs_done < nspecs; ++nspecs_done)
+ for (; (size_t) nspecs_done < nspecs && !Xprintf_buffer_has_failed (buf);
+ ++nspecs_done)
{
STEP4_TABLE;
@@ -1376,26 +1251,19 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
}
/* Process format specifiers. */
- while (1)
+ do
{
- int function_done;
-
if (spec <= UCHAR_MAX
&& __printf_function_table != NULL
&& __printf_function_table[(size_t) spec] != NULL)
{
- const void **ptr = alloca (specs[nspecs_done].ndata_args
- * sizeof (const void *));
-
- /* Fill in an array of pointers to the argument values. */
- for (unsigned int i = 0; i < specs[nspecs_done].ndata_args;
- ++i)
- ptr[i] = &args_value[specs[nspecs_done].data_arg + i];
-
- /* Call the function. */
- function_done = __printf_function_table[(size_t) spec]
- (s, &specs[nspecs_done].info, ptr);
-
+ int function_done
+ = Xprintf (function_invoke) (buf,
+ __printf_function_table[(size_t) spec],
+ &args_value[specs[nspecs_done]
+ .data_arg],
+ specs[nspecs_done].ndata_args,
+ &specs[nspecs_done].info);
if (function_done != -2)
{
/* If an error occurred we don't have information
@@ -1403,11 +1271,9 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
if (function_done < 0)
{
/* Function has set errno. */
- done = -1;
+ Xprintf_buffer_mark_failed (buf);
goto all_done;
}
-
- done_add (function_done);
break;
}
}
@@ -1450,327 +1316,159 @@ printf_positional (FILE *s, const CHAR_T *format, int readonly_format,
}
SETUP_FLOAT128_INFO (specs[nspecs_done].info);
- int function_done
- = __printf_fp_spec (s, &specs[nspecs_done].info, &ptr);
- if (function_done < 0)
- {
- /* Error in print handler; up to handler to set errno. */
- done = -1;
- goto all_done;
- }
- done_add (function_done);
+ __printf_fp_spec (buf, &specs[nspecs_done].info, &ptr);
}
break;
LABEL (form_unknown):
{
- int function_done = printf_unknown (s, &specs[nspecs_done].info);
-
- /* If an error occurred we don't have information about #
- of chars. */
- if (function_done < 0)
- {
- /* Function has set errno. */
- done = -1;
- goto all_done;
- }
-
- done_add (function_done);
+ printf_unknown (buf, &specs[nspecs_done].info);
}
break;
}
+ while (Xprintf_buffer_has_failed (buf));
/* Write the following constant string. */
- outstring (specs[nspecs_done].end_of_fmt,
- specs[nspecs_done].next_fmt
- - specs[nspecs_done].end_of_fmt);
+ Xprintf_buffer_write (buf,
+ (const CHAR_T *) specs[nspecs_done].end_of_fmt,
+ (specs[nspecs_done].next_fmt
+ - specs[nspecs_done].end_of_fmt));
}
all_done:
scratch_buffer_free (&argsbuf);
scratch_buffer_free (&specsbuf);
- return done;
}
\f
/* Handle an unknown format specifier. This prints out a canonicalized
representation of the format spec itself. */
-static int
-printf_unknown (FILE *s, const struct printf_info *info)
+static void
+printf_unknown (struct Xprintf_buffer *buf, const struct printf_info *info)
{
- int done = 0;
CHAR_T work_buffer[MAX (sizeof (info->width), sizeof (info->prec)) * 3];
CHAR_T *const workend
= &work_buffer[sizeof (work_buffer) / sizeof (CHAR_T)];
CHAR_T *w;
- outchar (L_('%'));
+ Xprintf_buffer_putc (buf, L_('%'));
if (info->alt)
- outchar (L_('#'));
+ Xprintf_buffer_putc (buf, L_('#'));
if (info->group)
- outchar (L_('\''));
+ Xprintf_buffer_putc (buf, L_('\''));
if (info->showsign)
- outchar (L_('+'));
+ Xprintf_buffer_putc (buf, L_('+'));
else if (info->space)
- outchar (L_(' '));
+ Xprintf_buffer_putc (buf, L_(' '));
if (info->left)
- outchar (L_('-'));
+ Xprintf_buffer_putc (buf, L_('-'));
if (info->pad == L_('0'))
- outchar (L_('0'));
+ Xprintf_buffer_putc (buf, L_('0'));
if (info->i18n)
- outchar (L_('I'));
+ Xprintf_buffer_putc (buf, L_('I'));
if (info->width != 0)
{
w = _itoa_word (info->width, workend, 10, 0);
while (w < workend)
- outchar (*w++);
+ Xprintf_buffer_putc (buf, *w++);
}
if (info->prec != -1)
{
- outchar (L_('.'));
+ Xprintf_buffer_putc (buf, L_('.'));
w = _itoa_word (info->prec, workend, 10, 0);
while (w < workend)
- outchar (*w++);
+ Xprintf_buffer_putc (buf, *w++);
}
if (info->spec != L_('\0'))
- outchar (info->spec);
-
- all_done:
- return done;
+ Xprintf_buffer_putc (buf, info->spec);
}
-\f
-/* Group the digits from W to REAR_PTR according to the grouping rules
- of the current locale. The interpretation of GROUPING is as in
- `struct lconv' from <locale.h>. The grouped number extends from
- the returned pointer until REAR_PTR. FRONT_PTR to W is used as a
- scratch area. */
-static CHAR_T *
-group_number (CHAR_T *front_ptr, CHAR_T *w, CHAR_T *rear_ptr,
- const char *grouping, THOUSANDS_SEP_T thousands_sep)
+
+static void
+group_number (struct Xprintf_buffer *buf,
+ struct grouping_iterator *iter,
+ CHAR_T *from, CHAR_T *to, THOUSANDS_SEP_T thousands_sep,
+ bool i18n)
{
- /* Length of the current group. */
- int len;
-#ifndef COMPILE_WPRINTF
- /* Length of the separator (in wide mode, the separator is always a
- single wide character). */
- int tlen = strlen (thousands_sep);
+ if (!i18n)
+ for (CHAR_T *cp = from; cp != to; ++cp)
+ {
+ if (__grouping_iterator_next (iter))
+ {
+#ifdef COMPILE_WPRINTF
+ __wprintf_buffer_putc (buf, thousands_sep);
+#else
+ __printf_buffer_puts (buf, thousands_sep);
#endif
-
- /* We treat all negative values like CHAR_MAX. */
-
- if (*grouping == CHAR_MAX || *grouping <= 0)
- /* No grouping should be done. */
- return w;
-
- len = *grouping++;
-
- /* Copy existing string so that nothing gets overwritten. */
- memmove (front_ptr, w, (rear_ptr - w) * sizeof (CHAR_T));
- CHAR_T *s = front_ptr + (rear_ptr - w);
-
- w = rear_ptr;
-
- /* Process all characters in the string. */
- while (s > front_ptr)
+ }
+ Xprintf_buffer_putc (buf, *cp);
+ }
+ else
{
- *--w = *--s;
-
- if (--len == 0 && s > front_ptr)
+ /* Apply digit translation and grouping. */
+ for (CHAR_T *cp = from; cp != to; ++cp)
{
- /* A new group begins. */
+ if (__grouping_iterator_next (iter))
+ {
#ifdef COMPILE_WPRINTF
- if (w != s)
- *--w = thousands_sep;
- else
- /* Not enough room for the separator. */
- goto copy_rest;
+ __wprintf_buffer_putc (buf, thousands_sep);
#else
- int cnt = tlen;
- if (tlen < w - s)
- do
- *--w = thousands_sep[--cnt];
- while (cnt > 0);
- else
- /* Not enough room for the separator. */
- goto copy_rest;
-#endif
-
- if (*grouping == CHAR_MAX
-#if CHAR_MIN < 0
- || *grouping < 0
+ __printf_buffer_puts (buf, thousands_sep);
#endif
- )
- {
- copy_rest:
- /* No further grouping to be done. Copy the rest of the
- number. */
- w -= s - front_ptr;
- memmove (w, front_ptr, (s - front_ptr) * sizeof (CHAR_T));
- break;
}
- else if (*grouping != '\0')
- len = *grouping++;
- else
- /* The previous grouping repeats ad infinitum. */
- len = grouping[-1];
- }
- }
- return w;
-}
-\f
-/* Helper "class" for `fprintf to unbuffered': creates a temporary buffer. */
-struct helper_file
- {
- struct _IO_FILE_plus _f;
+ int digit = *cp - '0';
#ifdef COMPILE_WPRINTF
- struct _IO_wide_data _wide_data;
-#endif
- FILE *_put_stream;
-#ifdef _IO_MTSAFE_IO
- _IO_lock_t lock;
-#endif
- };
-
-static int
-_IO_helper_overflow (FILE *s, int c)
-{
- FILE *target = ((struct helper_file*) s)->_put_stream;
-#ifdef COMPILE_WPRINTF
- int used = s->_wide_data->_IO_write_ptr - s->_wide_data->_IO_write_base;
- if (used)
- {
- size_t written = _IO_sputn (target, s->_wide_data->_IO_write_base, used);
- if (written == 0 || written == WEOF)
- return WEOF;
- __wmemmove (s->_wide_data->_IO_write_base,
- s->_wide_data->_IO_write_base + written,
- used - written);
- s->_wide_data->_IO_write_ptr -= written;
- }
+ __wprintf_buffer_putc
+ (buf, _NL_CURRENT_WORD (LC_CTYPE,
+ _NL_CTYPE_OUTDIGIT0_WC + digit));
#else
- int used = s->_IO_write_ptr - s->_IO_write_base;
- if (used)
- {
- size_t written = _IO_sputn (target, s->_IO_write_base, used);
- if (written == 0 || written == EOF)
- return EOF;
- memmove (s->_IO_write_base, s->_IO_write_base + written,
- used - written);
- s->_IO_write_ptr -= written;
- }
+ __printf_buffer_puts
+ (buf, _NL_CURRENT (LC_CTYPE, _NL_CTYPE_OUTDIGIT0_MB + digit));
#endif
- return PUTC (c, s);
+ }
+ }
}
-#ifdef COMPILE_WPRINTF
-static const struct _IO_jump_t _IO_helper_jumps libio_vtable =
-{
- JUMP_INIT_DUMMY,
- JUMP_INIT (finish, _IO_wdefault_finish),
- JUMP_INIT (overflow, _IO_helper_overflow),
- JUMP_INIT (underflow, _IO_default_underflow),
- JUMP_INIT (uflow, _IO_default_uflow),
- JUMP_INIT (pbackfail, (_IO_pbackfail_t) _IO_wdefault_pbackfail),
- JUMP_INIT (xsputn, _IO_wdefault_xsputn),
- JUMP_INIT (xsgetn, _IO_wdefault_xsgetn),
- JUMP_INIT (seekoff, _IO_default_seekoff),
- JUMP_INIT (seekpos, _IO_default_seekpos),
- JUMP_INIT (setbuf, _IO_default_setbuf),
- JUMP_INIT (sync, _IO_default_sync),
- JUMP_INIT (doallocate, _IO_wdefault_doallocate),
- JUMP_INIT (read, _IO_default_read),
- JUMP_INIT (write, _IO_default_write),
- JUMP_INIT (seek, _IO_default_seek),
- JUMP_INIT (close, _IO_default_close),
- JUMP_INIT (stat, _IO_default_stat)
-};
-#else
-static const struct _IO_jump_t _IO_helper_jumps libio_vtable =
-{
- JUMP_INIT_DUMMY,
- JUMP_INIT (finish, _IO_default_finish),
- JUMP_INIT (overflow, _IO_helper_overflow),
- JUMP_INIT (underflow, _IO_default_underflow),
- JUMP_INIT (uflow, _IO_default_uflow),
- JUMP_INIT (pbackfail, _IO_default_pbackfail),
- JUMP_INIT (xsputn, _IO_default_xsputn),
- JUMP_INIT (xsgetn, _IO_default_xsgetn),
- JUMP_INIT (seekoff, _IO_default_seekoff),
- JUMP_INIT (seekpos, _IO_default_seekpos),
- JUMP_INIT (setbuf, _IO_default_setbuf),
- JUMP_INIT (sync, _IO_default_sync),
- JUMP_INIT (doallocate, _IO_default_doallocate),
- JUMP_INIT (read, _IO_default_read),
- JUMP_INIT (write, _IO_default_write),
- JUMP_INIT (seek, _IO_default_seek),
- JUMP_INIT (close, _IO_default_close),
- JUMP_INIT (stat, _IO_default_stat)
-};
-#endif
-static int
-buffered_vfprintf (FILE *s, const CHAR_T *format, va_list args,
- unsigned int mode_flags)
+/* The FILE-based function. */
+int
+vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
{
- CHAR_T buf[BUFSIZ];
- struct helper_file helper;
- FILE *hp = (FILE *) &helper._f;
- int result, to_flush;
-
/* Orient the stream. */
#ifdef ORIENT
ORIENT;
#endif
- /* Initialize helper. */
- helper._put_stream = s;
-#ifdef COMPILE_WPRINTF
- hp->_wide_data = &helper._wide_data;
- _IO_wsetp (hp, buf, buf + sizeof buf / sizeof (CHAR_T));
- hp->_mode = 1;
-#else
- _IO_setp (hp, buf, buf + sizeof buf);
- hp->_mode = -1;
-#endif
- hp->_flags = _IO_MAGIC|_IO_NO_READS|_IO_USER_LOCK;
-#if _IO_JUMPS_OFFSET
- hp->_vtable_offset = 0;
-#endif
-#ifdef _IO_MTSAFE_IO
- hp->_lock = NULL;
+ /* Sanity check of arguments. */
+ ARGCHECK (s, format);
+
+#ifdef ORIENT
+ /* Check for correct orientation. */
+ if (_IO_vtable_offset (s) == 0
+ && _IO_fwide (s, sizeof (CHAR_T) == 1 ? -1 : 1)
+ != (sizeof (CHAR_T) == 1 ? -1 : 1))
+ /* The stream is already oriented otherwise. */
+ return EOF;
#endif
- hp->_flags2 = s->_flags2;
- _IO_JUMPS (&helper._f) = (struct _IO_jump_t *) &_IO_helper_jumps;
- /* Now print to helper instead. */
- result = vfprintf (hp, format, args, mode_flags);
+ int done;
/* Lock stream. */
- __libc_cleanup_region_start (1, (void (*) (void *)) &_IO_funlockfile, s);
+ _IO_cleanup_region_start ((void (*) (void *)) &_IO_funlockfile, s);
_IO_flockfile (s);
- /* Now flush anything from the helper to the S. */
-#ifdef COMPILE_WPRINTF
- if ((to_flush = (hp->_wide_data->_IO_write_ptr
- - hp->_wide_data->_IO_write_base)) > 0)
- {
- if ((int) _IO_sputn (s, hp->_wide_data->_IO_write_base, to_flush)
- != to_flush)
- result = -1;
- }
-#else
- if ((to_flush = hp->_IO_write_ptr - hp->_IO_write_base) > 0)
- {
- if ((int) _IO_sputn (s, hp->_IO_write_base, to_flush) != to_flush)
- result = -1;
- }
-#endif
+ /* Set up the wrapping buffer. */
+ struct Xprintf (buffer_to_file) wrap;
+ Xprintf (buffer_to_file_init) (&wrap, s);
+
+ /* Perform the printing operation on the buffer. */
+ Xprintf_buffer (&wrap.base, format, ap, mode_flags);
+ done = Xprintf (buffer_to_file_done) (&wrap);
/* Unlock the stream. */
_IO_funlockfile (s);
- __libc_cleanup_region_end (0);
+ _IO_cleanup_region_end (0);
- return result;
+ return done;
}
diff --git a/stdio-common/vfprintf-process-arg.c b/stdio-common/vfprintf-process-arg.c
index 4fe369e111..ca6402449d 100644
--- a/stdio-common/vfprintf-process-arg.c
+++ b/stdio-common/vfprintf-process-arg.c
@@ -27,7 +27,7 @@
now process the wanted format specifier. */
LABEL (form_percent):
/* Write a literal "%". */
- outchar (L_('%'));
+ Xprintf_buffer_putc (buf, L_('%'));
break;
LABEL (form_integer):
@@ -116,16 +116,8 @@ LABEL (unsigned_number): /* Unsigned number of base BASE. */
*--string = L_('0');
}
else
- {
- /* Put the number in WORK. */
- string = _itoa (number.longlong, workend, base,
- spec == L_('X'));
- if (group && grouping)
- string = group_number (work_buffer, string, workend,
- grouping, thousands_sep);
- if (use_outdigits && base == 10)
- string = _i18n_number_rewrite (string, workend, workend);
- }
+ /* Put the number in WORK. */
+ string = _itoa (number.longlong, workend, base, spec == L_('X'));
/* Simplify further test for num != 0. */
number.word = number.longlong != 0;
}
@@ -159,27 +151,46 @@ LABEL (unsigned_number): /* Unsigned number of base BASE. */
*--string = L_('0');
}
else
- {
- /* Put the number in WORK. */
- string = _itoa_word (number.word, workend, base,
- spec == L_('X'));
- if (group && grouping)
- string = group_number (work_buffer, string, workend,
- grouping, thousands_sep);
- if (use_outdigits && base == 10)
- string = _i18n_number_rewrite (string, workend, workend);
- }
+ /* Put the number in WORK. */
+ string = _itoa_word (number.word, workend, base,
+ spec == L_('X'));
}
- if (prec <= workend - string && number.word != 0 && alt && base == 8)
- /* Add octal marker. */
- *--string = L_('0');
+ /* Grouping is also used for outdigits translation. */
+ struct grouping_iterator iter;
+ bool number_slow_path = group || (use_outdigits && base == 10);
+ if (group)
+ __grouping_iterator_init (&iter, LC_NUMERIC, _NL_CURRENT_LOCALE,
+ workend - string);
+ else if (use_outdigits && base == 10)
+ __grouping_iterator_init_none (&iter, workend - string);
+
+ int number_length;
+#ifndef COMPILE_WPRINTF
+ if (use_outdigits && base == 10)
+ number_length = __translated_number_width (_NL_CURRENT_LOCALE,
+ string, workend);
+ else
+ number_length = workend - string;
+ if (group)
+ number_length += iter.separators * strlen (thousands_sep);
+#else
+ number_length = workend - string;
+ /* All wide separators have length 1. */
+ if (group && thousands_sep != L'\0')
+ number_length += iter.separators;
+#endif
+
+ /* The marker comes right before the number, but is not subject
+ to grouping. */
+ bool octal_marker = (prec <= number_length && number.word != 0
+ && alt && base == 8);
prec = MAX (0, prec - (workend - string));
if (!left)
{
- width -= workend - string + prec;
+ width -= number_length + prec;
if (number.word != 0 && alt && (base == 16 || base == 2))
/* Account for 0X, 0x, 0B or 0b hex or binary marker. */
@@ -190,27 +201,34 @@ LABEL (unsigned_number): /* Unsigned number of base BASE. */
if (pad == L_(' '))
{
- PAD (L_(' '));
+ Xprintf_buffer_pad (buf, L_(' '), width);
width = 0;
}
if (is_negative)
- outchar (L_('-'));
+ Xprintf_buffer_putc (buf, L_('-'));
else if (showsign)
- outchar (L_('+'));
+ Xprintf_buffer_putc (buf, L_('+'));
else if (space)
- outchar (L_(' '));
+ Xprintf_buffer_putc (buf, L_(' '));
if (number.word != 0 && alt && (base == 16 || base == 2))
{
- outchar (L_('0'));
- outchar (spec);
+ Xprintf_buffer_putc (buf, L_('0'));
+ Xprintf_buffer_putc (buf, spec);
}
width += prec;
- PAD (L_('0'));
+ Xprintf_buffer_pad (buf, L_('0'), width);
+
+ if (octal_marker)
+ Xprintf_buffer_putc (buf, L_('0'));
- outstring (string, workend - string);
+ if (number_slow_path)
+ group_number (buf, &iter, string, workend, thousands_sep,
+ use_outdigits && base == 10);
+ else
+ Xprintf_buffer_write (buf, string, workend - string);
break;
}
@@ -218,40 +236,41 @@ LABEL (unsigned_number): /* Unsigned number of base BASE. */
{
if (is_negative)
{
- outchar (L_('-'));
+ Xprintf_buffer_putc (buf, L_('-'));
--width;
}
else if (showsign)
{
- outchar (L_('+'));
+ Xprintf_buffer_putc (buf, L_('+'));
--width;
}
else if (space)
{
- outchar (L_(' '));
+ Xprintf_buffer_putc (buf, L_(' '));
--width;
}
if (number.word != 0 && alt && (base == 16 || base == 2))
{
- outchar (L_('0'));
- outchar (spec);
+ Xprintf_buffer_putc (buf, L_('0'));
+ Xprintf_buffer_putc (buf, spec);
width -= 2;
}
width -= workend - string + prec;
- if (prec > 0)
- {
- int temp = width;
- width = prec;
- PAD (L_('0'));
- width = temp;
- }
+ Xprintf_buffer_pad (buf, L_('0'), prec);
+
+ if (octal_marker)
+ Xprintf_buffer_putc (buf, L_('0'));
- outstring (string, workend - string);
+ if (number_slow_path)
+ group_number (buf, &iter, string, workend, thousands_sep,
+ use_outdigits && base == 10);
+ else
+ Xprintf_buffer_write (buf, string, workend - string);
- PAD (L_(' '));
+ Xprintf_buffer_pad (buf, L_(' '), width);
break;
}
@@ -300,16 +319,17 @@ LABEL (form_number):
}
/* Answer the count of characters written. */
void *ptrptr = process_arg_pointer ();
+ unsigned int written = Xprintf_buffer_done (buf);
if (is_longlong)
- *(long long int *) ptrptr = done;
+ *(long long int *) ptrptr = written;
else if (is_long_num)
- *(long int *) ptrptr = done;
+ *(long int *) ptrptr = written;
else if (is_char)
- *(char *) ptrptr = done;
+ *(char *) ptrptr = written;
else if (!is_short)
- *(int *) ptrptr = done;
+ *(int *) ptrptr = written;
else
- *(short int *) ptrptr = done;
+ *(short int *) ptrptr = written;
break;
LABEL (form_strerror):
@@ -341,14 +361,16 @@ LABEL (form_character):
goto LABEL (form_wcharacter);
--width; /* Account for the character itself. */
if (!left)
- PAD (L_(' '));
+ Xprintf_buffer_pad (buf, L_(' '), width);
#ifdef COMPILE_WPRINTF
- outchar (__btowc ((unsigned char) process_arg_int ())); /* Promoted. */
+ __wprintf_buffer_putc (buf, __btowc ((unsigned char) /* Promoted. */
+ process_arg_int ()));
#else
- outchar ((unsigned char) process_arg_int ()); /* Promoted. */
+ __printf_buffer_putc (buf, (unsigned char) /* Promoted. */
+ process_arg_int ());
#endif
if (left)
- PAD (L_(' '));
+ Xprintf_buffer_pad (buf, L_(' '), width);
break;
LABEL (form_string):
@@ -382,10 +404,8 @@ LABEL (form_string):
else if (!is_long && spec != L_('S'))
{
#ifdef COMPILE_WPRINTF
- done = outstring_converted_wide_string
- (s, (const char *) string, prec, width, left, done);
- if (done < 0)
- goto all_done;
+ outstring_converted_wide_string (buf, (const char *) string,
+ prec, width, left);
/* The padding has already been written. */
break;
#else
@@ -407,10 +427,8 @@ LABEL (form_string):
else
len = __wcslen (string);
#else
- done = outstring_converted_wide_string
- (s, (const wchar_t *) string, prec, width, left, done);
- if (done < 0)
- goto all_done;
+ outstring_converted_wide_string (buf, (const wchar_t *) string,
+ prec, width, left);
/* The padding has already been written. */
break;
#endif
@@ -418,15 +436,15 @@ LABEL (form_string):
if ((width -= len) < 0)
{
- outstring (string, len);
+ Xprintf_buffer_write (buf, string, len);
break;
}
if (!left)
- PAD (L_(' '));
- outstring (string, len);
+ Xprintf_buffer_pad (buf, L_(' '), width);
+ Xprintf_buffer_write (buf, string, len);
if (left)
- PAD (L_(' '));
+ Xprintf_buffer_pad (buf, L_(' '), width);
}
break;
@@ -436,10 +454,10 @@ LABEL (form_wcharacter):
/* Wide character. */
--width;
if (!left)
- PAD (L' ');
- outchar (process_arg_wchar_t ());
+ Xprintf_buffer_pad (buf, L_(' '), width);
+ Xprintf_buffer_putc (buf, process_arg_wchar_t ());
if (left)
- PAD (L' ');
+ Xprintf_buffer_pad (buf, L_(' '), width);
}
break;
@@ -447,24 +465,24 @@ LABEL (form_wcharacter):
LABEL (form_wcharacter):
{
/* Wide character. */
- char buf[MB_LEN_MAX];
+ char wcbuf[MB_LEN_MAX];
mbstate_t mbstate;
size_t len;
memset (&mbstate, '\0', sizeof (mbstate_t));
- len = __wcrtomb (buf, process_arg_wchar_t (), &mbstate);
+ len = __wcrtomb (wcbuf, process_arg_wchar_t (), &mbstate);
if (len == (size_t) -1)
{
/* Something went wrong during the conversion. Bail out. */
- done = -1;
+ __printf_buffer_mark_failed (buf);
goto all_done;
}
width -= len;
if (!left)
- PAD (' ');
- outstring (buf, len);
+ Xprintf_buffer_pad (buf, L_(' '), width);
+ Xprintf_buffer_write (buf, wcbuf, len);
if (left)
- PAD (' ');
+ Xprintf_buffer_pad (buf, L_(' '), width);
}
break;
#endif /* !COMPILE_WPRINTF */
diff --git a/stdlib/strfmon_l.c b/stdlib/strfmon_l.c
index d9b22088c7..6dc36e07cc 100644
--- a/stdlib/strfmon_l.c
+++ b/stdlib/strfmon_l.c
@@ -29,33 +29,8 @@
#include <string.h>
#include "../locale/localeinfo.h"
#include <bits/floatn.h>
-
-
-#define out_char(Ch) \
- do { \
- if (dest >= s + maxsize - 1) \
- { \
- __set_errno (E2BIG); \
- va_end (ap); \
- return -1; \
- } \
- *dest++ = (Ch); \
- } while (0)
-
-#define out_string(String) \
- do { \
- const char *_s = (String); \
- while (*_s) \
- out_char (*_s++); \
- } while (0)
-
-#define out_nstring(String, N) \
- do { \
- int _n = (N); \
- const char *_s = (String); \
- while (_n-- > 0) \
- out_char (*_s++); \
- } while (0)
+#include <stdio-common/grouping_iterator.h>
+#include <printf_buffer.h>
#define to_digit(Ch) ((Ch) - '0')
@@ -75,21 +50,15 @@
some information in the LC_MONETARY category which should be used,
too. Some of the information contradicts the information which can
be specified in format string. */
-ssize_t
-__vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
- const char *format, va_list ap, unsigned int flags)
+static void
+__vstrfmon_l_buffer (struct __printf_buffer *buf, locale_t loc,
+ const char *fmt, va_list ap, unsigned int flags)
{
struct __locale_data *current = loc->__locales[LC_MONETARY];
- _IO_strfile f;
struct printf_info info;
- char *dest; /* Pointer so copy the output. */
- const char *fmt; /* Pointer that walks through format. */
-
- dest = s;
- fmt = format;
/* Loop through the format-string. */
- while (*fmt != '\0')
+ while (*fmt != '\0' && !__printf_buffer_has_failed (buf))
{
/* The floating-point value to output. */
union
@@ -122,11 +91,9 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
int other_cs_precedes;
const char *sign_string;
const char *other_sign_string;
- int done;
const char *currency_symbol;
size_t currency_symbol_len;
long int width;
- char *startp;
const void *ptr;
char space_char;
@@ -134,14 +101,14 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
specification. */
if (*fmt != '%')
{
- out_char (*fmt++);
+ __printf_buffer_putc (buf, *fmt++);
continue;
}
/* "%%" means a single '%' character. */
if (fmt[1] == '%')
{
- out_char (*++fmt);
+ __printf_buffer_putc (buf, *++fmt);
++fmt;
continue;
}
@@ -171,7 +138,8 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
{
/* Premature EOS. */
__set_errno (EINVAL);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
continue;
case '^': /* Don't group digits. */
@@ -181,7 +149,8 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
if (n_sign_posn != -2)
{
__set_errno (EINVAL);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
p_sign_posn = *_NL_CURRENT (LC_MONETARY, P_SIGN_POSN);
n_sign_posn = *_NL_CURRENT (LC_MONETARY, N_SIGN_POSN);
@@ -190,7 +159,8 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
if (n_sign_posn != -2)
{
__set_errno (EINVAL);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
p_sign_posn = 0;
n_sign_posn = 0;
@@ -220,19 +190,12 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
|| (width == LONG_MAX && val > LONG_MAX % 10))
{
__set_errno (E2BIG);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
width = width * 10 + val;
}
-
- /* If we don't have enough room for the demanded width we
- can stop now and return an error. */
- if (width >= maxsize - (dest - s))
- {
- __set_errno (E2BIG);
- return -1;
- }
}
/* Recognize left precision. */
@@ -241,7 +204,8 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
if (!isdigit (*++fmt))
{
__set_errno (EINVAL);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
left_prec = to_digit (*fmt);
@@ -258,7 +222,8 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
if (!isdigit (*++fmt))
{
__set_errno (EINVAL);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
right_prec = to_digit (*fmt);
@@ -306,7 +271,8 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
break;
default: /* Any unrecognized format is an error. */
__set_errno (EINVAL);
- return -1;
+ __printf_buffer_mark_failed (buf);
+ return;
}
/* If not specified by the format string now find the values for
@@ -327,8 +293,11 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
/* If we have to print the digits grouped determine how many
extra characters this means. */
if (group && left_prec != -1)
- left_prec += __guess_grouping (left_prec,
- _NL_CURRENT (LC_MONETARY, MON_GROUPING));
+ {
+ struct grouping_iterator it;
+ __grouping_iterator_init (&it, LC_MONETARY, loc, left_prec);
+ left_prec += it.separators;
+ }
/* Now it's time to get the value. */
if (is_long_double == 1)
@@ -482,57 +451,46 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
#define left_paren '('
#define right_paren ')'
- startp = dest; /* Remember start so we can compute length. */
+ char *startp = buf->write_ptr;
- while (left_pad-- > 0)
- out_char (' ');
+ __printf_buffer_pad (buf, ' ', left_pad);
if (sign_posn == 0 && is_negative)
- out_char (left_paren);
+ __printf_buffer_putc (buf, left_paren);
if (cs_precedes)
{
if (sign_posn != 0 && sign_posn != 2 && sign_posn != 4
&& sign_posn != 5)
{
- out_string (sign_string);
+ __printf_buffer_puts (buf, sign_string);
if (sep_by_space == 2)
- out_char (' ');
+ __printf_buffer_putc (buf, ' ');
}
if (print_curr_symbol)
- out_string (currency_symbol);
+ __printf_buffer_puts (buf, currency_symbol);
if (sign_posn == 4)
{
if (print_curr_symbol && sep_by_space == 2)
- out_char (space_char);
- out_string (sign_string);
+ __printf_buffer_putc (buf, space_char);
+ __printf_buffer_puts (buf, sign_string);
if (sep_by_space == 1)
/* POSIX.2 and SUS are not clear on this case, but C99
says a space follows the adjacent-symbol-and-sign */
- out_char (' ');
+ __printf_buffer_putc (buf, ' ');
}
else
if (print_curr_symbol && sep_by_space == 1)
- out_char (space_char);
+ __printf_buffer_putc (buf, space_char);
}
else
if (sign_posn != 0 && sign_posn != 2 && sign_posn != 3
&& sign_posn != 4 && sign_posn != 5)
- out_string (sign_string);
+ __printf_buffer_puts (buf, sign_string);
/* Print the number. */
-#ifdef _IO_MTSAFE_IO
- f._sbf._f._lock = NULL;
-#endif
- _IO_init_internal (&f._sbf._f, 0);
- _IO_JUMPS (&f._sbf) = &_IO_str_jumps;
- _IO_str_init_static_internal (&f, dest, (s + maxsize) - dest, dest);
- /* We clear the last available byte so we can find out whether
- the numeric representation is too long. */
- s[maxsize - 1] = '\0';
-
memset (&info, '\0', sizeof (info));
info.prec = right_prec;
info.width = left_prec + (right_prec ? (right_prec + 1) : 0);
@@ -544,25 +502,17 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
info.extra = 1; /* This means use values from LC_MONETARY. */
ptr = &fpnum;
- done = __printf_fp_l (&f._sbf._f, loc, &info, &ptr);
- if (done < 0)
- return -1;
-
- if (s[maxsize - 1] != '\0')
- {
- __set_errno (E2BIG);
- return -1;
- }
-
- dest += done;
+ __printf_fp_l_buffer (buf, loc, &info, &ptr);
+ if (__printf_buffer_has_failed (buf))
+ return;
if (!cs_precedes)
{
if (sign_posn == 3)
{
if (sep_by_space == 1)
- out_char (' ');
- out_string (sign_string);
+ __printf_buffer_putc (buf, ' ');
+ __printf_buffer_puts (buf, sign_string);
}
if (print_curr_symbol)
@@ -572,55 +522,61 @@ __vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
|| (sign_posn == 2 && sep_by_space == 1)
|| (sign_posn == 1 && sep_by_space == 1)
|| (sign_posn == 0 && sep_by_space == 1))
- out_char (space_char);
- out_nstring (currency_symbol, currency_symbol_len);
+ __printf_buffer_putc (buf, space_char);
+ __printf_buffer_write (buf, currency_symbol,
+ __strnlen (currency_symbol,
+ currency_symbol_len));
}
if (sign_posn == 4)
{
if (sep_by_space == 2)
- out_char (' ');
- out_string (sign_string);
+ __printf_buffer_putc (buf, ' ');
+ __printf_buffer_puts (buf, sign_string);
}
}
if (sign_posn == 2)
{
if (sep_by_space == 2)
- out_char (' ');
- out_string (sign_string);
+ __printf_buffer_putc (buf, ' ');
+ __printf_buffer_puts (buf, sign_string);
}
if (sign_posn == 0 && is_negative)
- out_char (right_paren);
+ __printf_buffer_putc (buf, right_paren);
/* Now test whether the output width is filled. */
- if (dest - startp < width)
+ if (buf->write_ptr - startp < width)
{
- if (left)
- /* We simply have to fill using spaces. */
- do
- out_char (' ');
- while (dest - startp < width);
- else
+ size_t pad_width = width - (buf->write_ptr - startp);
+ __printf_buffer_pad (buf, ' ', pad_width);
+ if (__printf_buffer_has_failed (buf))
+ /* Implies length check. */
+ return;
+ /* Left padding is already in the correct position.
+ Otherwise move the field contents in place. */
+ if (!left)
{
- long int dist = width - (dest - startp);
- for (char *cp = dest - 1; cp >= startp; --cp)
- cp[dist] = cp[0];
-
- dest += dist;
-
- do
- startp[--dist] = ' ';
- while (dist > 0);
+ memmove (startp + pad_width, startp, buf->write_ptr - startp);
+ memset (startp, ' ', pad_width);
}
}
}
+}
- /* Terminate the string. */
- *dest = '\0';
-
- return dest - s;
+ssize_t
+__vstrfmon_l_internal (char *s, size_t maxsize, locale_t loc,
+ const char *format, va_list ap, unsigned int flags)
+{
+ struct __printf_buffer buf;
+ __printf_buffer_init (&buf, s, maxsize, __printf_buffer_mode_strfmon);
+ __vstrfmon_l_buffer (&buf, loc, format, ap, flags);
+ __printf_buffer_putc (&buf, '\0'); /* Terminate the string. */
+ if (__printf_buffer_has_failed (&buf))
+ return -1;
+ else
+ return buf.write_ptr - buf.write_base - 1; /* Exclude NUL byte. */
}
ssize_t
diff --git a/stdlib/strfrom-skeleton.c b/stdlib/strfrom-skeleton.c
index 1fba04bf6a..2ef3025c57 100644
--- a/stdlib/strfrom-skeleton.c
+++ b/stdlib/strfrom-skeleton.c
@@ -27,6 +27,7 @@
#include <printf.h>
#include <string.h>
#include <locale/localeinfo.h>
+#include <printf_buffer.h>
#define UCHAR_T char
#define L_(Str) Str
@@ -36,12 +37,7 @@
int
STRFROM (char *dest, size_t size, const char *format, FLOAT f)
{
- _IO_strnfile sfile;
-#ifdef _IO_MTSAFE_IO
- sfile.f._sbf._f._lock = NULL;
-#endif
-
- int done;
+ struct __printf_buffer_snprintf buf;
/* Single-precision values need to be stored in a double type, because
__printf_fp_l and __printf_fphex do not accept the float type. */
@@ -105,23 +101,8 @@ STRFROM (char *dest, size_t size, const char *format, FLOAT f)
abort ();
}
- /* The following code to prepare the virtual file has been adapted from the
- function __vsnprintf_internal from libio. */
-
- if (size == 0)
- {
- /* When size is zero, nothing is written and dest may be a null pointer.
- This is specified for snprintf in ISO/IEC 9899:2011, Section 7.21.6.5,
- in the second paragraph. Thus, if size is zero, prepare to use the
- overflow buffer right from the start. */
- dest = sfile.overflow_buf;
- size = sizeof (sfile.overflow_buf);
- }
-
- /* Prepare the virtual string file. */
- _IO_no_init (&sfile.f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
- _IO_JUMPS (&sfile.f._sbf) = &_IO_strn_jumps;
- _IO_str_init_static_internal (&sfile.f, dest, size - 1, dest);
+ /* Prepare the string buffer. */
+ __printf_buffer_snprintf_init (&buf, dest, size);
/* Prepare the format specification for printf_fp. */
memset (&info, '\0', sizeof (info));
@@ -143,13 +124,8 @@ STRFROM (char *dest, size_t size, const char *format, FLOAT f)
info.spec = specifier;
if (info.spec != 'a' && info.spec != 'A')
- done = __printf_fp_l (&sfile.f._sbf._f, _NL_CURRENT_LOCALE, &info, &fpptr);
+ __printf_fp_l_buffer (&buf.base, _NL_CURRENT_LOCALE, &info, &fpptr);
else
- done = __printf_fphex (&sfile.f._sbf._f, &info, &fpptr);
-
- /* Terminate the string. */
- if (sfile.f._sbf._f._IO_buf_base != sfile.overflow_buf)
- *sfile.f._sbf._f._IO_write_ptr = '\0';
-
- return done;
+ __printf_fphex_l_buffer (&buf.base, _NL_CURRENT_LOCALE, &info, &fpptr);
+ return __printf_buffer_snprintf_done (&buf);
}
diff --git a/sysdeps/ia64/fpu/printf_fphex.c b/sysdeps/ia64/fpu/printf_fphex.c
index e7c3109510..91347b7e3d 100644
--- a/sysdeps/ia64/fpu/printf_fphex.c
+++ b/sysdeps/ia64/fpu/printf_fphex.c
@@ -35,16 +35,10 @@ do { \
\
numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \
info->spec == 'A'); \
- wnumstr = _itowa_word (num, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \
- 16, info->spec == 'A'); \
\
/* Fill with zeroes. */ \
while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
- { \
- *--numstr = '0'; \
- *--wnumstr = L'0'; \
- } \
+ *--numstr = '0'; \
\
/* We use a full nibble for the leading digit. */ \
leading = *numstr++; \
diff --git a/sysdeps/ieee754/ldbl-128/printf_fphex_macros.h b/sysdeps/ieee754/ldbl-128/printf_fphex_macros.h
index 28dccb1170..bc712a2527 100644
--- a/sysdeps/ieee754/ldbl-128/printf_fphex_macros.h
+++ b/sysdeps/ieee754/ldbl-128/printf_fphex_macros.h
@@ -36,45 +36,23 @@ do { \
zero_mantissa = (num0|num1) == 0; \
\
if (sizeof (unsigned long int) > 6) \
- { \
- numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16, \
- info->spec == 'A'); \
- wnumstr = _itowa_word (num1, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
- 16, info->spec == 'A'); \
- } \
+ numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16, \
+ info->spec == 'A'); \
else \
- { \
- numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \
- info->spec == 'A'); \
- wnumstr = _itowa (num1, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \
- 16, info->spec == 'A'); \
- } \
+ numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \
+ info->spec == 'A'); \
\
while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
- { \
- *--numstr = '0'; \
- *--wnumstr = L'0'; \
- } \
+ *--numstr = '0'; \
\
if (sizeof (unsigned long int) > 6) \
- { \
- numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \
- wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A'); \
- } \
+ numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \
else \
- { \
- numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \
- wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A'); \
- } \
+ numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \
\
/* Fill with zeroes. */ \
while (numstr > numbuf + (sizeof numbuf - 112 / 4)) \
- { \
*--numstr = '0'; \
- *--wnumstr = L'0'; \
- } \
\
leading = u.ieee.exponent == 0 ? '0' : '1'; \
\
diff --git a/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c b/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c
index 58733f85e5..a06cbe7cb6 100644
--- a/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c
+++ b/sysdeps/ieee754/ldbl-128ibm/printf_fphex.c
@@ -68,45 +68,23 @@ do { \
zero_mantissa = (num0|num1) == 0; \
\
if (sizeof (unsigned long int) > 6) \
- { \
- numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16, \
- info->spec == 'A'); \
- wnumstr = _itowa_word (num1, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
- 16, info->spec == 'A'); \
- } \
+ numstr = _itoa_word (num1, numbuf + sizeof numbuf, 16, \
+ info->spec == 'A'); \
else \
- { \
- numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \
+ numstr = _itoa (num1, numbuf + sizeof numbuf, 16, \
info->spec == 'A'); \
- wnumstr = _itowa (num1, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \
- 16, info->spec == 'A'); \
- } \
\
while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
- { \
- *--numstr = '0'; \
- *--wnumstr = L'0'; \
- } \
+ *--numstr = '0'; \
\
if (sizeof (unsigned long int) > 6) \
- { \
- numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \
- wnumstr = _itowa_word (num0, wnumstr, 16, info->spec == 'A'); \
- } \
+ numstr = _itoa_word (num0, numstr, 16, info->spec == 'A'); \
else \
- { \
- numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \
- wnumstr = _itowa (num0, wnumstr, 16, info->spec == 'A'); \
- } \
+ numstr = _itoa (num0, numstr, 16, info->spec == 'A'); \
\
/* Fill with zeroes. */ \
while (numstr > numbuf + (sizeof numbuf - 112 / 4)) \
- { \
- *--numstr = '0'; \
- *--wnumstr = L'0'; \
- } \
+ *--numstr = '0'; \
\
leading = u.d[0].ieee.exponent == 0 ? '0' : '1'; \
\
diff --git a/sysdeps/ieee754/ldbl-96/printf_fphex.c b/sysdeps/ieee754/ldbl-96/printf_fphex.c
index 26bc60682e..1f09b5f08b 100644
--- a/sysdeps/ieee754/ldbl-96/printf_fphex.c
+++ b/sysdeps/ieee754/ldbl-96/printf_fphex.c
@@ -36,31 +36,17 @@ do { \
zero_mantissa = num == 0; \
\
if (sizeof (unsigned long int) > 6) \
- { \
- numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \
- info->spec == 'A'); \
- wnumstr = _itowa_word (num, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
- 16, info->spec == 'A'); \
- } \
+ numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \
+ info->spec == 'A'); \
else \
- { \
- numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\
- wnumstr = _itowa (num, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \
- 16, info->spec == 'A'); \
- } \
+ numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A'); \
\
/* Fill with zeroes. */ \
while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
- { \
- *--numstr = '0'; \
- *--wnumstr = L'0'; \
- } \
+ *--numstr = '0'; \
\
/* We use a full nibble for the leading digit. */ \
leading = *numstr++; \
- wnumstr++; \
\
/* We have 3 bits from the mantissa in the leading nibble. \
Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \
diff --git a/sysdeps/x86_64/fpu/printf_fphex.c b/sysdeps/x86_64/fpu/printf_fphex.c
index d2de75d4ac..bb702ec7c5 100644
--- a/sysdeps/x86_64/fpu/printf_fphex.c
+++ b/sysdeps/x86_64/fpu/printf_fphex.c
@@ -34,31 +34,16 @@ do { \
zero_mantissa = num == 0; \
\
if (sizeof (unsigned long int) > 6) \
- { \
- numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, \
- info->spec == 'A'); \
- wnumstr = _itowa_word (num, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t),\
- 16, info->spec == 'A'); \
- } \
+ numstr = _itoa_word (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\
else \
- { \
- numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A');\
- wnumstr = _itowa (num, \
- wnumbuf + sizeof (wnumbuf) / sizeof (wchar_t), \
- 16, info->spec == 'A'); \
- } \
+ numstr = _itoa (num, numbuf + sizeof numbuf, 16, info->spec == 'A'); \
\
/* Fill with zeroes. */ \
while (numstr > numbuf + (sizeof numbuf - 64 / 4)) \
- { \
- *--numstr = '0'; \
- *--wnumstr = L'0'; \
- } \
+ *--numstr = '0'; \
\
/* We use a full nibble for the leading digit. */ \
leading = *numstr++; \
- wnumstr++; \
\
/* We have 3 bits from the mantissa in the leading nibble. \
Therefore we are here using `IEEE854_LONG_DOUBLE_BIAS + 3'. */ \
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 09/14] stdio-common: Add lock optimization to vfprintf and vfwprintf
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (7 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 08/14] stdio-common: Convert vfprintf and related functions to buffers Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 10/14] libio: Convert __vsprintf_internal to buffers Florian Weimer
` (4 subsequent siblings)
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
After the rewrite and the implicit unbuffered streams handling, this
is very straightforward to add.
---
stdio-common/vfprintf-internal.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/stdio-common/vfprintf-internal.c b/stdio-common/vfprintf-internal.c
index 83a6aea510..23ada8d0ff 100644
--- a/stdio-common/vfprintf-internal.c
+++ b/stdio-common/vfprintf-internal.c
@@ -1452,6 +1452,14 @@ vfprintf (FILE *s, const CHAR_T *format, va_list ap, unsigned int mode_flags)
return EOF;
#endif
+ if (!_IO_need_lock (s))
+ {
+ struct Xprintf (buffer_to_file) wrap;
+ Xprintf (buffer_to_file_init) (&wrap, s);
+ Xprintf_buffer (&wrap.base, format, ap, mode_flags);
+ return Xprintf (buffer_to_file_done) (&wrap);
+ }
+
int done;
/* Lock stream. */
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 10/14] libio: Convert __vsprintf_internal to buffers
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (8 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 09/14] stdio-common: Add lock optimization to vfprintf and vfwprintf Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 11/14] libio: Convert __vasprintf_internal " Florian Weimer
` (3 subsequent siblings)
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
---
include/printf_buffer.h | 2 +
libio/iovsprintf.c | 70 ++++++++----------------------
stdio-common/printf_buffer_flush.c | 4 ++
3 files changed, 24 insertions(+), 52 deletions(-)
diff --git a/include/printf_buffer.h b/include/printf_buffer.h
index 95d1b06489..c938cb6085 100644
--- a/include/printf_buffer.h
+++ b/include/printf_buffer.h
@@ -44,7 +44,9 @@
enum __printf_buffer_mode
{
__printf_buffer_mode_failed,
+ __printf_buffer_mode_sprintf,
__printf_buffer_mode_snprintf,
+ __printf_buffer_mode_sprintf_chk,
__printf_buffer_mode_to_file,
__printf_buffer_mode_strfmon,
__printf_buffer_mode_fp, /* For __printf_fp_l_buffer. */
diff --git a/libio/iovsprintf.c b/libio/iovsprintf.c
index 72c67bf27b..ba4e180a35 100644
--- a/libio/iovsprintf.c
+++ b/libio/iovsprintf.c
@@ -25,58 +25,18 @@
in files containing the exception. */
#include "libioP.h"
-#include "strfile.h"
-static int __THROW
-_IO_str_chk_overflow (FILE *fp, int c)
-{
- /* If we get here, the user-supplied buffer would be overrun by
- further output. */
- __chk_fail ();
-}
-
-static const struct _IO_jump_t _IO_str_chk_jumps libio_vtable =
-{
- JUMP_INIT_DUMMY,
- JUMP_INIT(finish, _IO_str_finish),
- JUMP_INIT(overflow, _IO_str_chk_overflow),
- JUMP_INIT(underflow, _IO_str_underflow),
- JUMP_INIT(uflow, _IO_default_uflow),
- JUMP_INIT(pbackfail, _IO_str_pbackfail),
- JUMP_INIT(xsputn, _IO_default_xsputn),
- JUMP_INIT(xsgetn, _IO_default_xsgetn),
- JUMP_INIT(seekoff, _IO_str_seekoff),
- JUMP_INIT(seekpos, _IO_default_seekpos),
- JUMP_INIT(setbuf, _IO_default_setbuf),
- JUMP_INIT(sync, _IO_default_sync),
- JUMP_INIT(doallocate, _IO_default_doallocate),
- JUMP_INIT(read, _IO_default_read),
- JUMP_INIT(write, _IO_default_write),
- JUMP_INIT(seek, _IO_default_seek),
- JUMP_INIT(close, _IO_default_close),
- JUMP_INIT(stat, _IO_default_stat),
- JUMP_INIT(showmanyc, _IO_default_showmanyc),
- JUMP_INIT(imbue, _IO_default_imbue)
-};
-
-/* This function is called by regular vsprintf with maxlen set to -1,
- and by vsprintf_chk with maxlen set to the size of the output
- string. In the former case, _IO_str_chk_overflow will never be
- called; in the latter case it will crash the program if the buffer
- overflows. */
+#include <printf.h>
+#include <stdint.h>
+#include <printf_buffer.h>
int
__vsprintf_internal (char *string, size_t maxlen,
const char *format, va_list args,
unsigned int mode_flags)
{
- _IO_strfile sf;
- int ret;
+ struct __printf_buffer buf;
-#ifdef _IO_MTSAFE_IO
- sf._sbf._f._lock = NULL;
-#endif
- _IO_no_init (&sf._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
/* When called from fortified sprintf/vsprintf, erase the destination
buffer and try to detect overflows. When called from regular
sprintf/vsprintf, do not erase the destination buffer, because
@@ -84,19 +44,25 @@ __vsprintf_internal (char *string, size_t maxlen,
by ISO C), nor try to detect overflows. */
if ((mode_flags & PRINTF_CHK) != 0)
{
- _IO_JUMPS (&sf._sbf) = &_IO_str_chk_jumps;
string[0] = '\0';
+ __printf_buffer_init (&buf, string, maxlen,
+ __printf_buffer_mode_sprintf);
}
else
- _IO_JUMPS (&sf._sbf) = &_IO_str_jumps;
- _IO_str_init_static_internal (&sf, string,
- (maxlen == -1) ? -1 : maxlen - 1,
- string);
+ {
+ __printf_buffer_init (&buf, string, 0, __printf_buffer_mode_sprintf_chk);
+ buf.write_end = (char *) ~(uintptr_t) 0; /* End of address space. */
+ }
+
+ __printf_buffer (&buf, format, args, mode_flags);
- ret = __vfprintf_internal (&sf._sbf._f, format, args, mode_flags);
+ /* Write the NUL terminator if there is room. Do not use the putc
+ operation to avoid overflowing the character write count. */
+ if ((mode_flags & PRINTF_CHK) != 0 && buf.write_ptr == buf.write_end)
+ __chk_fail ();
+ *buf.write_ptr = '\0';
- *sf._sbf._f._IO_write_ptr = '\0';
- return ret;
+ return __printf_buffer_done (&buf);
}
int
diff --git a/stdio-common/printf_buffer_flush.c b/stdio-common/printf_buffer_flush.c
index bfd1f9d733..f44c8b887f 100644
--- a/stdio-common/printf_buffer_flush.c
+++ b/stdio-common/printf_buffer_flush.c
@@ -38,10 +38,14 @@ __printf_buffer_do_flush (struct __printf_buffer *buf)
switch (buf->mode)
{
case __printf_buffer_mode_failed:
+ case __printf_buffer_mode_sprintf:
return;
case __printf_buffer_mode_snprintf:
__printf_buffer_flush_snprintf ((struct __printf_buffer_snprintf *) buf);
return;
+ case __printf_buffer_mode_sprintf_chk:
+ __chk_fail ();
+ break;
case __printf_buffer_mode_to_file:
__printf_buffer_flush_to_file ((struct __printf_buffer_to_file *) buf);
return;
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 11/14] libio: Convert __vasprintf_internal to buffers
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (9 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 10/14] libio: Convert __vsprintf_internal to buffers Florian Weimer
@ 2022-05-23 14:07 ` Florian Weimer
2022-05-23 14:08 ` [PATCH v2 12/14] libio: Convert __vdprintf_internal " Florian Weimer
` (2 subsequent siblings)
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:07 UTC (permalink / raw)
To: libc-alpha
The buffer resizing algorithm is slightly different. The initial
buffer is on the stack, and small buffers are directly allocated
on the heap using the exact required size. The overhead of the
additional copy is compensated by the lowered setup cost for buffers
compared to libio streams.
---
include/printf_buffer.h | 4 +
libio/vasprintf.c | 141 ++++++++++++++++++++---------
stdio-common/printf_buffer_flush.c | 4 +
3 files changed, 104 insertions(+), 45 deletions(-)
diff --git a/include/printf_buffer.h b/include/printf_buffer.h
index c938cb6085..0f3543d9b9 100644
--- a/include/printf_buffer.h
+++ b/include/printf_buffer.h
@@ -48,6 +48,7 @@ enum __printf_buffer_mode
__printf_buffer_mode_snprintf,
__printf_buffer_mode_sprintf_chk,
__printf_buffer_mode_to_file,
+ __printf_buffer_mode_asprintf,
__printf_buffer_mode_strfmon,
__printf_buffer_mode_fp, /* For __printf_fp_l_buffer. */
__printf_buffer_mode_fp_to_wide, /* For __wprintf_fp_l_buffer. */
@@ -301,6 +302,9 @@ void __printf_buffer_flush_snprintf (struct __printf_buffer_snprintf *)
struct __printf_buffer_to_file;
void __printf_buffer_flush_to_file (struct __printf_buffer_to_file *)
attribute_hidden;
+struct __printf_buffer_asprintf;
+void __printf_buffer_flush_asprintf (struct __printf_buffer_asprintf *)
+ attribute_hidden;
struct __printf_buffer_fp;
void __printf_buffer_flush_fp (struct __printf_buffer_fp *)
attribute_hidden;
diff --git a/libio/vasprintf.c b/libio/vasprintf.c
index 4430a266c6..f4ff7ec98b 100644
--- a/libio/vasprintf.c
+++ b/libio/vasprintf.c
@@ -24,64 +24,115 @@
This exception applies to code released by its copyright holders
in files containing the exception. */
-#include <string.h>
+#include <array_length.h>
+#include <errno.h>
+#include <limits.h>
+#include <math_ldbl_opt.h>
+#include <printf.h>
+#include <stdio.h>
#include <stdlib.h>
-#include <strfile.h>
+#include <string.h>
+#include <printf_buffer.h>
+
+struct __printf_buffer_asprintf
+{
+ /* base.write_base points either to a heap-allocated buffer, or to
+ the direct array below. */
+ struct __printf_buffer base;
+
+ /* Initial allocation. 200 should be large enough to copy almost
+ all asprintf usages with just a single (final, correctly sized)
+ heap allocation. */
+ char direct[200];
+};
+
+void
+__printf_buffer_flush_asprintf (struct __printf_buffer_asprintf *buf)
+{
+ size_t current_pos = buf->base.write_ptr - buf->base.write_base;
+ if (current_pos >= INT_MAX)
+ {
+ /* The result is not representable. No need to continue. */
+ __set_errno (EOVERFLOW);
+ __printf_buffer_mark_failed (&buf->base);
+ return;
+ }
+
+ size_t current_size = buf->base.write_end - buf->base.write_base;
+ /* Implement an exponentiatial sizing policy. Keep the size
+ congruent 8 (mod 16), to account for the footer in glibc
+ malloc. */
+ size_t new_size = ((current_size + current_size / 2) & -15) | 8;
+ char *new_buffer;
+ if (buf->base.write_base == buf->direct)
+ {
+ new_buffer = malloc (new_size);
+ if (new_buffer == NULL)
+ {
+ __printf_buffer_mark_failed (&buf->base);
+ return;
+ }
+ memcpy (new_buffer, buf->direct, current_pos);
+ }
+ else
+ {
+ new_buffer = realloc (buf->base.write_base, new_size);
+ if (new_buffer == NULL)
+ {
+ __printf_buffer_mark_failed (&buf->base);
+ return;
+ }
+ }
+
+ /* Set up the new write area. */
+ buf->base.write_base = new_buffer;
+ buf->base.write_ptr = new_buffer + current_pos;
+ buf->base.write_end = new_buffer + new_size;
+}
+
int
__vasprintf_internal (char **result_ptr, const char *format, va_list args,
unsigned int mode_flags)
{
- /* Initial size of the buffer to be used. Will be doubled each time an
- overflow occurs. */
- const size_t init_string_size = 100;
- char *string;
- _IO_strfile sf;
- int ret;
- size_t needed;
- size_t allocated;
- /* No need to clear the memory here (unlike for open_memstream) since
- we know we will never seek on the stream. */
- string = (char *) malloc (init_string_size);
- if (string == NULL)
- return -1;
-#ifdef _IO_MTSAFE_IO
- sf._sbf._f._lock = NULL;
-#endif
- _IO_no_init (&sf._sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
- _IO_JUMPS (&sf._sbf) = &_IO_str_jumps;
- _IO_str_init_static_internal (&sf, string, init_string_size, string);
- sf._sbf._f._flags &= ~_IO_USER_BUF;
- sf._s._allocate_buffer_unused = (_IO_alloc_type) malloc;
- sf._s._free_buffer_unused = (_IO_free_type) free;
- ret = __vfprintf_internal (&sf._sbf._f, format, args, mode_flags);
- if (ret < 0)
+ struct __printf_buffer_asprintf buf;
+ __printf_buffer_init (&buf.base, buf.direct, array_length (buf.direct),
+ __printf_buffer_mode_asprintf);
+
+ __printf_buffer (&buf.base, format, args, mode_flags);
+ int done = __printf_buffer_done (&buf.base);
+ if (done < 0)
{
- free (sf._sbf._f._IO_buf_base);
- return ret;
+ if (buf.base.write_base != buf.direct)
+ free (buf.base.write_base);
+ return done;
+ }
+
+ /* Transfer to the final buffer. */
+ char *result;
+ size_t size = buf.base.write_ptr - buf.base.write_base;
+ if (buf.base.write_base == buf.direct)
+ {
+ result = malloc (size + 1);
+ if (result == NULL)
+ return -1;
+ memcpy (result, buf.direct, size);
}
- /* Only use realloc if the size we need is of the same (binary)
- order of magnitude then the memory we allocated. */
- needed = sf._sbf._f._IO_write_ptr - sf._sbf._f._IO_write_base + 1;
- allocated = sf._sbf._f._IO_write_end - sf._sbf._f._IO_write_base;
- if ((allocated >> 1) <= needed)
- *result_ptr = (char *) realloc (sf._sbf._f._IO_buf_base, needed);
else
{
- *result_ptr = (char *) malloc (needed);
- if (*result_ptr != NULL)
+ result = realloc (buf.base.write_base, size + 1);
+ if (result == NULL)
{
- memcpy (*result_ptr, sf._sbf._f._IO_buf_base, needed - 1);
- free (sf._sbf._f._IO_buf_base);
+ free (buf.base.write_base);
+ return -1;
}
- else
- /* We have no choice, use the buffer we already have. */
- *result_ptr = (char *) realloc (sf._sbf._f._IO_buf_base, needed);
}
- if (*result_ptr == NULL)
- *result_ptr = sf._sbf._f._IO_buf_base;
- (*result_ptr)[needed - 1] = '\0';
- return ret;
+
+ /* Add NUL termination. */
+ result[size] = '\0';
+ *result_ptr = result;
+
+ return done;
}
int
diff --git a/stdio-common/printf_buffer_flush.c b/stdio-common/printf_buffer_flush.c
index f44c8b887f..14fe1b2df4 100644
--- a/stdio-common/printf_buffer_flush.c
+++ b/stdio-common/printf_buffer_flush.c
@@ -27,6 +27,7 @@
#ifndef SHARED
# pragma weak __printf_buffer_flush_snprintf
# pragma weak __printf_buffer_flush_to_file
+# pragma weak __printf_buffer_flush_asprintf
# pragma weak __printf_buffer_flush_fp
# pragma weak __printf_buffer_flush_fp_to_wide
# pragma weak __printf_buffer_flush_fphex_to_wide
@@ -49,6 +50,9 @@ __printf_buffer_do_flush (struct __printf_buffer *buf)
case __printf_buffer_mode_to_file:
__printf_buffer_flush_to_file ((struct __printf_buffer_to_file *) buf);
return;
+ case __printf_buffer_mode_asprintf:
+ __printf_buffer_flush_asprintf ((struct __printf_buffer_asprintf *) buf);
+ return;
case __printf_buffer_mode_strfmon:
__set_errno (E2BIG);
__printf_buffer_mark_failed (buf);
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 12/14] libio: Convert __vdprintf_internal to buffers
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (10 preceding siblings ...)
2022-05-23 14:07 ` [PATCH v2 11/14] libio: Convert __vasprintf_internal " Florian Weimer
@ 2022-05-23 14:08 ` Florian Weimer
2022-05-23 14:08 ` [PATCH v2 13/14] libio: Convert __obstack_vprintf_internal to buffers (bug 27124) Florian Weimer
2022-05-23 14:08 ` [PATCH v2 14/14] libio: Convert __vswprintf_internal to buffers (bug 27857) Florian Weimer
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:08 UTC (permalink / raw)
To: libc-alpha
The internal buffer size is set to 2048 bytes. This is less than
the original BUFSIZ value used by buffered_vfprintf before
the conversion, but it hopefully covers all cases where write
boundaries matter.
---
include/printf_buffer.h | 4 ++
libio/iovdprintf.c | 69 ++++++++++++++++++------------
stdio-common/printf_buffer_flush.c | 4 ++
3 files changed, 49 insertions(+), 28 deletions(-)
diff --git a/include/printf_buffer.h b/include/printf_buffer.h
index 0f3543d9b9..1943cd76f1 100644
--- a/include/printf_buffer.h
+++ b/include/printf_buffer.h
@@ -49,6 +49,7 @@ enum __printf_buffer_mode
__printf_buffer_mode_sprintf_chk,
__printf_buffer_mode_to_file,
__printf_buffer_mode_asprintf,
+ __printf_buffer_mode_dprintf,
__printf_buffer_mode_strfmon,
__printf_buffer_mode_fp, /* For __printf_fp_l_buffer. */
__printf_buffer_mode_fp_to_wide, /* For __wprintf_fp_l_buffer. */
@@ -305,6 +306,9 @@ void __printf_buffer_flush_to_file (struct __printf_buffer_to_file *)
struct __printf_buffer_asprintf;
void __printf_buffer_flush_asprintf (struct __printf_buffer_asprintf *)
attribute_hidden;
+struct __printf_buffer_dprintf;
+void __printf_buffer_flush_dprintf (struct __printf_buffer_dprintf *)
+ attribute_hidden;
struct __printf_buffer_fp;
void __printf_buffer_flush_fp (struct __printf_buffer_fp *)
attribute_hidden;
diff --git a/libio/iovdprintf.c b/libio/iovdprintf.c
index 1e483868c9..f4cdd6b537 100644
--- a/libio/iovdprintf.c
+++ b/libio/iovdprintf.c
@@ -24,41 +24,54 @@
This exception applies to code released by its copyright holders
in files containing the exception. */
-#include <libioP.h>
+#include <array_length.h>
+#include <math_ldbl_opt.h>
+#include <printf.h>
#include <stdio_ext.h>
+#include <unistd.h>
+#include <printf_buffer.h>
-int
-__vdprintf_internal (int d, const char *format, va_list arg,
- unsigned int mode_flags)
+struct __printf_buffer_dprintf
{
- struct _IO_FILE_plus tmpfil;
- struct _IO_wide_data wd;
- int done;
+ struct __printf_buffer base;
+ int fd;
+
+ /* This should cover most of the packet-oriented file descriptors,
+ where boundaries between writes could be visible to readers. */
+ char buf[2048];
+};
-#ifdef _IO_MTSAFE_IO
- tmpfil.file._lock = NULL;
-#endif
- _IO_no_init (&tmpfil.file, _IO_USER_LOCK, 0, &wd, &_IO_wfile_jumps);
- _IO_JUMPS (&tmpfil) = &_IO_file_jumps;
- _IO_new_file_init_internal (&tmpfil);
- if (_IO_file_attach (&tmpfil.file, d) == NULL)
+void
+__printf_buffer_flush_dprintf (struct __printf_buffer_dprintf *buf)
+{
+ char *p = buf->buf;
+ char *end = buf->base.write_ptr;
+ while (p < end)
{
- _IO_un_link (&tmpfil);
- return EOF;
+ ssize_t ret = TEMP_FAILURE_RETRY (write (buf->fd, p, end - p));
+ if (ret < 0)
+ {
+ __printf_buffer_mark_failed (&buf->base);
+ return;
+ }
+ p += ret;
}
- tmpfil.file._flags |= _IO_DELETE_DONT_CLOSE;
-
- _IO_mask_flags (&tmpfil.file, _IO_NO_READS,
- _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
-
- done = __vfprintf_internal (&tmpfil.file, format, arg, mode_flags);
-
- if (done != EOF && _IO_do_flush (&tmpfil.file) == EOF)
- done = EOF;
-
- _IO_FINISH (&tmpfil.file);
+ buf->base.write_ptr = buf->buf;
+}
- return done;
+int
+__vdprintf_internal (int d, const char *format, va_list arg,
+ unsigned int mode_flags)
+{
+ struct __printf_buffer_dprintf buf;
+ __printf_buffer_init (&buf.base, buf.buf, array_length (buf.buf),
+ __printf_buffer_mode_dprintf);
+ buf.fd = d;
+ __printf_buffer (&buf.base, format, arg, mode_flags);
+ if (__printf_buffer_has_failed (&buf.base))
+ return -1;
+ __printf_buffer_flush_dprintf (&buf);
+ return __printf_buffer_done (&buf.base);
}
int
diff --git a/stdio-common/printf_buffer_flush.c b/stdio-common/printf_buffer_flush.c
index 14fe1b2df4..922340cc54 100644
--- a/stdio-common/printf_buffer_flush.c
+++ b/stdio-common/printf_buffer_flush.c
@@ -28,6 +28,7 @@
# pragma weak __printf_buffer_flush_snprintf
# pragma weak __printf_buffer_flush_to_file
# pragma weak __printf_buffer_flush_asprintf
+# pragma weak __printf_buffer_flush_dprintf
# pragma weak __printf_buffer_flush_fp
# pragma weak __printf_buffer_flush_fp_to_wide
# pragma weak __printf_buffer_flush_fphex_to_wide
@@ -53,6 +54,9 @@ __printf_buffer_do_flush (struct __printf_buffer *buf)
case __printf_buffer_mode_asprintf:
__printf_buffer_flush_asprintf ((struct __printf_buffer_asprintf *) buf);
return;
+ case __printf_buffer_mode_dprintf:
+ __printf_buffer_flush_dprintf ((struct __printf_buffer_dprintf *) buf);
+ return;
case __printf_buffer_mode_strfmon:
__set_errno (E2BIG);
__printf_buffer_mark_failed (buf);
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 13/14] libio: Convert __obstack_vprintf_internal to buffers (bug 27124)
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (11 preceding siblings ...)
2022-05-23 14:08 ` [PATCH v2 12/14] libio: Convert __vdprintf_internal " Florian Weimer
@ 2022-05-23 14:08 ` Florian Weimer
2022-05-23 14:08 ` [PATCH v2 14/14] libio: Convert __vswprintf_internal to buffers (bug 27857) Florian Weimer
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:08 UTC (permalink / raw)
To: libc-alpha
This fixes bug 27124 because the problematic built-in vtable is gone.
---
include/printf_buffer.h | 4 +
libio/obprintf.c | 170 +++++++++--------------------
stdio-common/printf_buffer_flush.c | 4 +
3 files changed, 58 insertions(+), 120 deletions(-)
diff --git a/include/printf_buffer.h b/include/printf_buffer.h
index 1943cd76f1..8b9a09647d 100644
--- a/include/printf_buffer.h
+++ b/include/printf_buffer.h
@@ -54,6 +54,7 @@ enum __printf_buffer_mode
__printf_buffer_mode_fp, /* For __printf_fp_l_buffer. */
__printf_buffer_mode_fp_to_wide, /* For __wprintf_fp_l_buffer. */
__printf_buffer_mode_fphex_to_wide, /* For __wprintf_fphex_l_buffer. */
+ __printf_buffer_mode_obstack,
};
/* Buffer for fast character writing with overflow handling.
@@ -319,6 +320,9 @@ struct __printf_buffer_fphex_to_wide;
void __printf_buffer_flush_fphex_to_wide (struct
__printf_buffer_fphex_to_wide *)
attribute_hidden;
+struct __printf_buffer_obstack;
+void __printf_buffer_flush_obstack (struct __printf_buffer_obstack *)
+ attribute_hidden;
struct __wprintf_buffer_to_file;
void __wprintf_buffer_flush_to_file (struct __wprintf_buffer_to_file *)
diff --git a/libio/obprintf.c b/libio/obprintf.c
index c220be9adc..459d73ebf3 100644
--- a/libio/obprintf.c
+++ b/libio/obprintf.c
@@ -16,131 +16,59 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-
-#include <stdlib.h>
-#include "libioP.h"
-#include "strfile.h"
#include <assert.h>
-#include <string.h>
-#include <errno.h>
+#include <math_ldbl_opt.h>
#include <obstack.h>
+#include <printf.h>
#include <stdarg.h>
-#include <stdio_ext.h>
-
+#include <printf_buffer.h>
-struct _IO_obstack_file
+struct __printf_buffer_obstack
{
- struct _IO_FILE_plus file;
+ struct __printf_buffer base;
struct obstack *obstack;
-};
-
-
-static int
-_IO_obstack_overflow (FILE *fp, int c)
-{
- struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
- int size;
-
- /* Make room for another character. This might as well allocate a
- new chunk a memory and moves the old contents over. */
- assert (c != EOF);
- obstack_1grow (obstack, c);
-
- /* Setup the buffer pointers again. */
- fp->_IO_write_base = obstack_base (obstack);
- fp->_IO_write_ptr = obstack_next_free (obstack);
- size = obstack_room (obstack);
- fp->_IO_write_end = fp->_IO_write_ptr + size;
- /* Now allocate the rest of the current chunk. */
- obstack_blank_fast (obstack, size);
-
- return c;
-}
+ /* obstack_1grow is called for compatibility reasons. This needs
+ one extra character, and this is the backing store for it. */
+ char ch;
+};
-static size_t
-_IO_obstack_xsputn (FILE *fp, const void *data, size_t n)
+void
+__printf_buffer_flush_obstack (struct __printf_buffer_obstack *buf)
{
- struct obstack *obstack = ((struct _IO_obstack_file *) fp)->obstack;
+ /* About to switch buffers, so record the bytes written so far. */
+ buf->base.written += buf->base.write_ptr - buf->base.write_base;
- if (fp->_IO_write_ptr + n > fp->_IO_write_end)
+ if (buf->base.write_ptr == &buf->ch + 1)
{
- int size;
-
- /* We need some more memory. First shrink the buffer to the
- space we really currently need. */
- obstack_blank_fast (obstack, fp->_IO_write_ptr - fp->_IO_write_end);
-
- /* Now grow for N bytes, and put the data there. */
- obstack_grow (obstack, data, n);
-
- /* Setup the buffer pointers again. */
- fp->_IO_write_base = obstack_base (obstack);
- fp->_IO_write_ptr = obstack_next_free (obstack);
- size = obstack_room (obstack);
- fp->_IO_write_end = fp->_IO_write_ptr + size;
- /* Now allocate the rest of the current chunk. */
- obstack_blank_fast (obstack, size);
+ /* Errors are reported via a callback mechanism (presumably for
+ process termination). */
+ obstack_1grow (buf->obstack, buf->ch);
+ buf->base.write_base = obstack_next_free (buf->obstack);
+ buf->base.write_ptr = buf->base.write_base;
+ size_t size = obstack_room (buf->obstack);
+ buf->base.write_end = buf->base.write_ptr + size;
+ /* Reserve the space on the obstack size. */
+ obstack_blank_fast (buf->obstack, size);
}
else
- fp->_IO_write_ptr = __mempcpy (fp->_IO_write_ptr, data, n);
-
- return n;
+ {
+ /* Obtain the extra character. */
+ buf->base.write_base = &buf->ch;
+ buf->base.write_ptr = &buf->ch;
+ buf->base.write_end = &buf->ch + 1;
+ }
}
-
-/* the jump table. */
-const struct _IO_jump_t _IO_obstack_jumps libio_vtable attribute_hidden =
-{
- JUMP_INIT_DUMMY,
- JUMP_INIT(finish, NULL),
- JUMP_INIT(overflow, _IO_obstack_overflow),
- JUMP_INIT(underflow, NULL),
- JUMP_INIT(uflow, NULL),
- JUMP_INIT(pbackfail, NULL),
- JUMP_INIT(xsputn, _IO_obstack_xsputn),
- JUMP_INIT(xsgetn, NULL),
- JUMP_INIT(seekoff, NULL),
- JUMP_INIT(seekpos, NULL),
- JUMP_INIT(setbuf, NULL),
- JUMP_INIT(sync, NULL),
- JUMP_INIT(doallocate, NULL),
- JUMP_INIT(read, NULL),
- JUMP_INIT(write, NULL),
- JUMP_INIT(seek, NULL),
- JUMP_INIT(close, NULL),
- JUMP_INIT(stat, NULL),
- JUMP_INIT(showmanyc, NULL),
- JUMP_INIT(imbue, NULL)
-};
-
-
int
__obstack_vprintf_internal (struct obstack *obstack, const char *format,
va_list args, unsigned int mode_flags)
{
- struct obstack_FILE
- {
- struct _IO_obstack_file ofile;
- } new_f;
- int result;
- int size;
- int room;
-
-#ifdef _IO_MTSAFE_IO
- new_f.ofile.file.file._lock = NULL;
-#endif
-
- _IO_no_init (&new_f.ofile.file.file, _IO_USER_LOCK, -1, NULL, NULL);
- _IO_JUMPS (&new_f.ofile.file) = &_IO_obstack_jumps;
- room = obstack_room (obstack);
- size = obstack_object_size (obstack) + room;
+ /* Legacy setup code for compatibility. */
+ size_t room = obstack_room (obstack);
+ size_t size = obstack_object_size (obstack) + room;
if (size == 0)
{
- /* We have to handle the allocation a bit different since the
- `_IO_str_init_static' function would handle a size of zero
- different from what we expect. */
-
/* Get more memory. */
obstack_make_room (obstack, 64);
@@ -151,27 +79,29 @@ __obstack_vprintf_internal (struct obstack *obstack, const char *format,
assert (size != 0);
}
- _IO_str_init_static_internal ((struct _IO_strfile_ *) &new_f.ofile,
- obstack_base (obstack),
- size, obstack_next_free (obstack));
+ struct __printf_buffer_obstack buf;
+ {
+ /* The obstack write location might be in the middle of an object. */
+ char *ptr = obstack_next_free (obstack);
+ char *end = obstack_base (obstack) + size;
+ __printf_buffer_init (&buf.base, ptr, end - ptr,
+ __printf_buffer_mode_obstack);
+ }
+ buf.obstack = obstack;
+
/* Now allocate the rest of the current chunk. */
- assert (size == (new_f.ofile.file.file._IO_write_end
- - new_f.ofile.file.file._IO_write_base));
- assert (new_f.ofile.file.file._IO_write_ptr
- == (new_f.ofile.file.file._IO_write_base
- + obstack_object_size (obstack)));
obstack_blank_fast (obstack, room);
- new_f.ofile.obstack = obstack;
-
- result = __vfprintf_internal (&new_f.ofile.file.file, format, args,
- mode_flags);
+ __printf_buffer (&buf.base, format, args, mode_flags);
- /* Shrink the buffer to the space we really currently need. */
- obstack_blank_fast (obstack, (new_f.ofile.file.file._IO_write_ptr
- - new_f.ofile.file.file._IO_write_end));
+ if (buf.base.write_ptr == &buf.ch + 1)
+ /* buf.ch is in use. Put it into the obstack. */
+ obstack_1grow (buf.obstack, buf.ch);
+ else if (buf.base.write_ptr != &buf.ch)
+ /* Shrink the buffer to the space we really currently need. */
+ obstack_blank_fast (buf.obstack, buf.base.write_ptr - buf.base.write_end);
- return result;
+ return __printf_buffer_done (&buf.base);
}
int
diff --git a/stdio-common/printf_buffer_flush.c b/stdio-common/printf_buffer_flush.c
index 922340cc54..42afe49413 100644
--- a/stdio-common/printf_buffer_flush.c
+++ b/stdio-common/printf_buffer_flush.c
@@ -32,6 +32,7 @@
# pragma weak __printf_buffer_flush_fp
# pragma weak __printf_buffer_flush_fp_to_wide
# pragma weak __printf_buffer_flush_fphex_to_wide
+# pragma weak __printf_buffer_flush_obstack
#endif /* !SHARED */
static void
@@ -72,6 +73,9 @@ __printf_buffer_do_flush (struct __printf_buffer *buf)
__printf_buffer_flush_fphex_to_wide
((struct __printf_buffer_fphex_to_wide *) buf);
return;
+ case __printf_buffer_mode_obstack:
+ __printf_buffer_flush_obstack ((struct __printf_buffer_obstack *) buf);
+ return;
}
__builtin_trap ();
}
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* [PATCH v2 14/14] libio: Convert __vswprintf_internal to buffers (bug 27857)
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
` (12 preceding siblings ...)
2022-05-23 14:08 ` [PATCH v2 13/14] libio: Convert __obstack_vprintf_internal to buffers (bug 27124) Florian Weimer
@ 2022-05-23 14:08 ` Florian Weimer
13 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 14:08 UTC (permalink / raw)
To: libc-alpha
Always null-terminate the buffer and set E2BIG if the buffer is too
small. This fixes bug 27857.
---
v2: Drop _IO_wstrn_jumps from elf/tst-relro-libc.
elf/Makefile | 1 -
include/printf_buffer.h | 1 +
libio/tst_swprintf.c | 31 ++++++++-
libio/vswprintf.c | 100 +++++-----------------------
manual/stdio.texi | 7 +-
stdio-common/wprintf_buffer_flush.c | 6 ++
6 files changed, 57 insertions(+), 89 deletions(-)
diff --git a/elf/Makefile b/elf/Makefile
index 6f4ea78007..6afe3d58b0 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -611,7 +611,6 @@ $(objpfx)tst-relro-libc.out: tst-relro-symbols.py $(..)/scripts/glibcelf.py \
--required=_IO_wfile_jumps_mmap \
--required=_IO_wmem_jumps \
--required=_IO_wstr_jumps \
- --required=_IO_wstrn_jumps \
--optional=_IO_old_cookie_jumps \
--optional=_IO_old_file_jumps \
--optional=_IO_old_proc_jumps \
diff --git a/include/printf_buffer.h b/include/printf_buffer.h
index 8b9a09647d..51d5dfc84e 100644
--- a/include/printf_buffer.h
+++ b/include/printf_buffer.h
@@ -194,6 +194,7 @@ bool __printf_buffer_flush (struct __printf_buffer *buf) attribute_hidden;
enum __wprintf_buffer_mode
{
__wprintf_buffer_mode_failed,
+ __wprintf_buffer_mode_swprintf,
__wprintf_buffer_mode_to_file,
};
diff --git a/libio/tst_swprintf.c b/libio/tst_swprintf.c
index 8a2ffe60ec..df47a1cceb 100644
--- a/libio/tst_swprintf.c
+++ b/libio/tst_swprintf.c
@@ -1,4 +1,5 @@
#include <array_length.h>
+#include <errno.h>
#include <stdio.h>
#include <support/check.h>
#include <sys/types.h>
@@ -37,6 +38,8 @@ do_test (void)
for (n = 0; n < array_length (tests); ++n)
{
+ wmemset (buf, 0xabcd, array_length (buf));
+ errno = 0;
ssize_t res = swprintf (buf, tests[n].n, L"%s", tests[n].str);
if (tests[n].exp < 0 && res >= 0)
@@ -52,9 +55,31 @@ do_test (void)
swprintf (buf, %Zu, L\"%%s\", \"%s\") expected to return %Zd, but got %Zd\n",
tests[n].n, tests[n].str, tests[n].exp, res);
}
- else
- printf ("swprintf (buf, %Zu, L\"%%s\", \"%s\") OK\n",
- tests[n].n, tests[n].str);
+ else if (res < 0
+ && tests[n].n > 0
+ && wcsnlen (buf, array_length (buf)) == array_length (buf))
+ {
+ support_record_failure ();
+ printf ("\
+error: swprintf (buf, %Zu, L\"%%s\", \"%s\") missing null terminator\n",
+ tests[n].n, tests[n].str);
+ }
+ else if (res < 0
+ && tests[n].n > 0
+ && wcsnlen (buf, array_length (buf)) < array_length (buf)
+ && buf[wcsnlen (buf, array_length (buf)) + 1] != 0xabcd)
+ {
+ support_record_failure ();
+ printf ("\
+error: swprintf (buf, %Zu, L\"%%s\", \"%s\") out of bounds write\n",
+ tests[n].n, tests[n].str);
+ }
+
+ if (res < 0 && tests[n].n < 0)
+ TEST_COMPARE (errno, E2BIG);
+
+ printf ("swprintf (buf, %Zu, L\"%%s\", \"%s\") OK\n",
+ tests[n].n, tests[n].str);
}
TEST_COMPARE (swprintf (buf, array_length (buf), L"%.0s", "foo"), 0);
diff --git a/libio/vswprintf.c b/libio/vswprintf.c
index 5a9ccdff3e..f53545c806 100644
--- a/libio/vswprintf.c
+++ b/libio/vswprintf.c
@@ -24,101 +24,37 @@
This exception applies to code released by its copyright holders
in files containing the exception. */
-#include "libioP.h"
-#include "strfile.h"
-
-
-static wint_t _IO_wstrn_overflow (FILE *fp, wint_t c) __THROW;
-
-static wint_t
-_IO_wstrn_overflow (FILE *fp, wint_t c)
-{
- /* When we come to here this means the user supplied buffer is
- filled. But since we must return the number of characters which
- would have been written in total we must provide a buffer for
- further use. We can do this by writing on and on in the overflow
- buffer in the _IO_wstrnfile structure. */
- _IO_wstrnfile *snf = (_IO_wstrnfile *) fp;
-
- if (fp->_wide_data->_IO_buf_base != snf->overflow_buf)
- {
- _IO_wsetb (fp, snf->overflow_buf,
- snf->overflow_buf + (sizeof (snf->overflow_buf)
- / sizeof (wchar_t)), 0);
-
- fp->_wide_data->_IO_write_base = snf->overflow_buf;
- fp->_wide_data->_IO_read_base = snf->overflow_buf;
- fp->_wide_data->_IO_read_ptr = snf->overflow_buf;
- fp->_wide_data->_IO_read_end = (snf->overflow_buf
- + (sizeof (snf->overflow_buf)
- / sizeof (wchar_t)));
- }
-
- fp->_wide_data->_IO_write_ptr = snf->overflow_buf;
- fp->_wide_data->_IO_write_end = snf->overflow_buf;
-
- /* Since we are not really interested in storing the characters
- which do not fit in the buffer we simply ignore it. */
- return c;
-}
-
-
-const struct _IO_jump_t _IO_wstrn_jumps libio_vtable attribute_hidden =
-{
- JUMP_INIT_DUMMY,
- JUMP_INIT(finish, _IO_wstr_finish),
- JUMP_INIT(overflow, (_IO_overflow_t) _IO_wstrn_overflow),
- JUMP_INIT(underflow, (_IO_underflow_t) _IO_wstr_underflow),
- JUMP_INIT(uflow, (_IO_underflow_t) _IO_wdefault_uflow),
- JUMP_INIT(pbackfail, (_IO_pbackfail_t) _IO_wstr_pbackfail),
- JUMP_INIT(xsputn, _IO_wdefault_xsputn),
- JUMP_INIT(xsgetn, _IO_wdefault_xsgetn),
- JUMP_INIT(seekoff, _IO_wstr_seekoff),
- JUMP_INIT(seekpos, _IO_default_seekpos),
- JUMP_INIT(setbuf, _IO_default_setbuf),
- JUMP_INIT(sync, _IO_default_sync),
- JUMP_INIT(doallocate, _IO_wdefault_doallocate),
- JUMP_INIT(read, _IO_default_read),
- JUMP_INIT(write, _IO_default_write),
- JUMP_INIT(seek, _IO_default_seek),
- JUMP_INIT(close, _IO_default_close),
- JUMP_INIT(stat, _IO_default_stat),
- JUMP_INIT(showmanyc, _IO_default_showmanyc),
- JUMP_INIT(imbue, _IO_default_imbue)
-};
-
+#include <errno.h>
+#include <math_ldbl_opt.h>
+#include <printf.h>
+#include <printf_buffer.h>
int
__vswprintf_internal (wchar_t *string, size_t maxlen, const wchar_t *format,
va_list args, unsigned int mode_flags)
{
- _IO_wstrnfile sf;
- int ret;
- struct _IO_wide_data wd;
-#ifdef _IO_MTSAFE_IO
- sf.f._sbf._f._lock = NULL;
-#endif
-
if (maxlen == 0)
/* Since we have to write at least the terminating L'\0' a buffer
length of zero always makes the function fail. */
return -1;
- _IO_no_init (&sf.f._sbf._f, _IO_USER_LOCK, 0, &wd, &_IO_wstrn_jumps);
- _IO_fwide (&sf.f._sbf._f, 1);
- string[0] = L'\0';
- _IO_wstr_init_static (&sf.f._sbf._f, string, maxlen - 1, string);
- ret = __vfwprintf_internal ((FILE *) &sf.f._sbf, format, args, mode_flags);
+ struct __wprintf_buffer buf;
+ __wprintf_buffer_init (&buf, string, maxlen, __wprintf_buffer_mode_swprintf);
- if (sf.f._sbf._f._wide_data->_IO_buf_base == sf.overflow_buf)
- /* ISO C99 requires swprintf/vswprintf to return an error if the
- output does not fit in the provided buffer. */
- return -1;
+ __wprintf_buffer (&buf, format, args, mode_flags);
+
+ if (buf.write_ptr == buf.write_end)
+ {
+ /* Buffer has been filled exactly, excluding the null wide
+ character. This is an error because the null wide character
+ is required. */
+ buf.write_end[-1] = L'\0';
+ return -1;
+ }
- /* Terminate the string. */
- *sf.f._sbf._f._wide_data->_IO_write_ptr = '\0';
+ buf.write_ptr[0] = L'\0';
- return ret;
+ return __wprintf_buffer_done (&buf);
}
int
diff --git a/manual/stdio.texi b/manual/stdio.texi
index 753c50920d..278ab462ae 100644
--- a/manual/stdio.texi
+++ b/manual/stdio.texi
@@ -2412,9 +2412,10 @@ allocate at least @var{size} wide characters for the string @var{ws}.
The return value is the number of characters generated for the given
input, excluding the trailing null. If not all output fits into the
-provided buffer a negative value is returned. You should try again with
-a bigger output string. @emph{Note:} this is different from how
-@code{snprintf} handles this situation.
+provided buffer a negative value is returned, and @code{errno} is set to
+@code{E2BIG}. (The setting of @code{errno} is a GNU extension.) You
+should try again with a bigger output string. @emph{Note:} this is
+different from how @code{snprintf} handles this situation.
Note that the corresponding narrow stream function takes fewer
parameters. @code{swprintf} in fact corresponds to the @code{snprintf}
diff --git a/stdio-common/wprintf_buffer_flush.c b/stdio-common/wprintf_buffer_flush.c
index 2d91095cca..46af0f348f 100644
--- a/stdio-common/wprintf_buffer_flush.c
+++ b/stdio-common/wprintf_buffer_flush.c
@@ -16,6 +16,7 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <errno.h>
#include <printf_buffer.h>
#include "printf_buffer-wchar_t.h"
@@ -31,6 +32,11 @@ __wprintf_buffer_do_flush (struct __wprintf_buffer *buf)
case __wprintf_buffer_mode_to_file:
__wprintf_buffer_flush_to_file ((struct __wprintf_buffer_to_file *) buf);
return;
+ case __wprintf_buffer_mode_swprintf:
+ buf->write_end[-1] = L'\0';
+ __set_errno (E2BIG);
+ __wprintf_buffer_mark_failed (buf);
+ return;
}
__builtin_trap ();
}
--
2.35.3
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 01/14] stdio-common: Add printf specifier registry to <printf.h>
2022-05-23 14:07 ` [PATCH v2 01/14] stdio-common: Add printf specifier registry to <printf.h> Florian Weimer
@ 2022-05-23 14:37 ` Andreas Schwab
0 siblings, 0 replies; 36+ messages in thread
From: Andreas Schwab @ 2022-05-23 14:37 UTC (permalink / raw)
To: Florian Weimer via Libc-alpha; +Cc: Florian Weimer
On Mai 23 2022, Florian Weimer via Libc-alpha wrote:
> Add __printf_arginfo_table, __printf_function_table,
> __printf_va_arg_table, __register_printf_specifier to
> include/printf.h.
Ok.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 04/14] locale: Implement struct grouping_iterator
2022-05-23 14:07 ` [PATCH v2 04/14] locale: Implement struct grouping_iterator Florian Weimer
@ 2022-05-23 20:00 ` Adhemerval Zanella
2022-05-24 13:31 ` Andreas Schwab
1 sibling, 0 replies; 36+ messages in thread
From: Adhemerval Zanella @ 2022-05-23 20:00 UTC (permalink / raw)
To: Florian Weimer, libc-alpha
On 23/05/2022 11:07, Florian Weimer via Libc-alpha wrote:
> The iterator allows grouping while scanning forward through
> the digits. This enables emitting digits as they are processed.
LGTM, thanks.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> ---
> stdio-common/Makefile | 9 +-
> stdio-common/grouping_iterator.c | 125 +++++++++++++
> stdio-common/grouping_iterator.h | 65 +++++++
> stdio-common/tst-grouping_iterator.c | 262 +++++++++++++++++++++++++++
> 4 files changed, 460 insertions(+), 1 deletion(-)
> create mode 100644 stdio-common/grouping_iterator.c
> create mode 100644 stdio-common/grouping_iterator.h
> create mode 100644 stdio-common/tst-grouping_iterator.c
>
> diff --git a/stdio-common/Makefile b/stdio-common/Makefile
> index b1e9144de0..da3a3bc0c9 100644
> --- a/stdio-common/Makefile
> +++ b/stdio-common/Makefile
> @@ -39,6 +39,7 @@ routines := \
> gentempfd \
> getline \
> getw \
> + grouping_iterator \
> iovfscanf \
> isoc99_fscanf \
> isoc99_scanf \
> @@ -221,6 +222,10 @@ generated += \
> siglist-aux.S \
> # generated
>
> +tests-internal = \
> + tst-grouping_iterator \
> + # tests-internal
> +
> test-srcs = tst-unbputc tst-printf tst-printfsz-islongdouble
>
> ifeq ($(run-built-tests),yes)
> @@ -288,13 +293,15 @@ LOCALES := \
> hi_IN.UTF-8 \
> ja_JP.EUC-JP \
> ps_AF.UTF-8 \
> - # LOCALES
> + tg_TJ.UTF-8 \
> + # LOCALES
> include ../gen-locales.mk
>
> $(objpfx)bug14.out: $(gen-locales)
> $(objpfx)scanf13.out: $(gen-locales)
> $(objpfx)test-vfprintf.out: $(gen-locales)
> $(objpfx)tst-grouping.out: $(gen-locales)
> +$(objpfx)tst-grouping_iterator.out: $(gen-locales)
> $(objpfx)tst-sprintf.out: $(gen-locales)
> $(objpfx)tst-sscanf.out: $(gen-locales)
> $(objpfx)tst-swprintf.out: $(gen-locales)
Ok.
> diff --git a/stdio-common/grouping_iterator.c b/stdio-common/grouping_iterator.c
> new file mode 100644
> index 0000000000..cc169e2b09
> --- /dev/null
> +++ b/stdio-common/grouping_iterator.c
> @@ -0,0 +1,125 @@
> +/* Iterator for inserting thousands separators into numbers.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <grouping_iterator.h>
> +
> +#include <assert.h>
> +#include <limits.h>
> +#include <locale/localeinfo.h>
> +#include <stdint.h>
> +#include <string.h>
> +
> +/* Initializes *IT with no grouping information for a string of length
> + DIGITS, and return false to indicate no grouping. */
> +bool
> +__grouping_iterator_init_none (struct grouping_iterator *it, size_t digits)
> +{
> + memset (it, 0, sizeof (*it));
> + it->remaining_in_current_group = digits;
> + it->remaining = digits;
> + return false;
> +}
Ok, I would guess compiler will optimize the memset away.
> +
> +static bool
> +grouping_iterator_setup (struct grouping_iterator *it, size_t digits,
> + const char *grouping)
> +{
> + /* We treat all negative values like CHAR_MAX. */
> +
> + if (*grouping == CHAR_MAX || *grouping <= 0)
> + /* No grouping should be done. */
> + return __grouping_iterator_init_none (it, digits);
> +
> + size_t remaining_to_group = digits;
> + size_t non_repeating_groups = 0;
> + size_t groups = 0;
> + while (true)
> + {
> + non_repeating_groups += *grouping;
> + if (remaining_to_group <= (unsigned int) *grouping)
> + break;
> +
> + ++groups;
> + remaining_to_group -= *grouping++;
> +
> + if (*grouping == CHAR_MAX
> +#if CHAR_MIN < 0
> + || *grouping < 0
> +#endif
> + )
> + /* No more grouping should be done. */
> + break;
> + else if (*grouping == 0)
> + {
> + /* Same grouping repeats. */
> + --grouping;
> + non_repeating_groups -= *grouping; /* Over-counted. */
> + size_t repeats = (remaining_to_group - 1) / *grouping;
> + groups += repeats;
> + remaining_to_group -= repeats * *grouping;
> + break;
> + }
> + }
> +
> + it->remaining_in_current_group = remaining_to_group;
> + it->remaining = digits;
> + it->groupings = grouping;
> + it->non_repeating_groups = non_repeating_groups;
> + it->separators = groups;
> + return it->separators > 0;
> +}
> +
> +/* Returns the appropriate grouping item in LOC depending on CATEGORY
> + (which must be LC_MONETARY or LC_NUMERIC). */
> +static const char *
> +get_grouping (int category, locale_t loc)
> +{
> + return _nl_lookup (loc, category,
> + category == LC_MONETARY ? MON_GROUPING : GROUPING);
> +}
> +
> +
> +bool
> +__grouping_iterator_init (struct grouping_iterator *it,
> + int category, locale_t loc, size_t digits)
> +{
> + if (digits <= 1)
> + return __grouping_iterator_init_none (it, digits);
> + else
> + return grouping_iterator_setup (it, digits, get_grouping (category, loc));
> +}
> +
> +bool
> +__grouping_iterator_next (struct grouping_iterator *it)
> +{
> + assert (it->remaining > 0);
> + --it->remaining;
> +
> + if (it->remaining_in_current_group > 0)
> + {
> + --it->remaining_in_current_group;
> + return false;
> + }
> +
> + /* If we are in the non-repeating part, switch group. */
> + if (it->remaining < it->non_repeating_groups)
> + --it->groupings;
> +
> + it->remaining_in_current_group = *it->groupings - 1;
> + return true;
> +}
Ok.
> diff --git a/stdio-common/grouping_iterator.h b/stdio-common/grouping_iterator.h
> new file mode 100644
> index 0000000000..ca41a7fdc1
> --- /dev/null
> +++ b/stdio-common/grouping_iterator.h
> @@ -0,0 +1,65 @@
> +/* Iterator for grouping a number while scanning it forward.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef GROUPING_ITERATOR_H
> +#define GROUPING_ITERATOR_H
> +
> +#include <locale.h>
> +#include <stdbool.h>
> +#include <stddef.h>
> +
> +struct grouping_iterator
> +{
> + /* Number of characters in the current group. If this reaches zero,
> + a thousands separator needs to be emittted. */
> + size_t remaining_in_current_group;
> +
> + /* Number of characters remaining in the number. This is used to
> + detect the start of the non-repeating groups. */
> + size_t remaining;
> +
> + /* Points to the current grouping descriptor. */
> + const char *groupings;
> +
> + /* Total number of characters in the non-repeating groups. */
> + size_t non_repeating_groups;
> +
> + /* Number of separators that will be inserted if the whole number is
> + processed. (Does not change during iteration.) */
> + size_t separators;
> +};
> +
> +struct __locale_data;
> +
> +/* Initializes *IT with the data from LOCDATA (which must be for
> + LC_MONETARY or LC_NUMERIC). DIGITS is the length of the number.
> + Returns true if grouping is active, false if not. */
> +bool __grouping_iterator_init (struct grouping_iterator *it,
> + int category, locale_t loc,
> + size_t digits) attribute_hidden;
> +
> +/* Initializes *IT with no grouping information for a string of length
> + DIGITS, and return false to indicate no grouping. */
> +bool __grouping_iterator_init_none (struct grouping_iterator *it, size_t digits)
> + attribute_hidden;
> +
> +/* Advances to the next character and returns true if a thousands
> + separator should be inserted before emitting it. */
> +bool __grouping_iterator_next (struct grouping_iterator *it);
> +
> +#endif /* GROUPING_ITERATOR_H */
Ok.
> diff --git a/stdio-common/tst-grouping_iterator.c b/stdio-common/tst-grouping_iterator.c
> new file mode 100644
> index 0000000000..97d8f40628
> --- /dev/null
> +++ b/stdio-common/tst-grouping_iterator.c
> @@ -0,0 +1,262 @@
> +/* Test for struct grouping_iterator.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +/* Rebuild the fail to access internal-only functions. */
> +#include <grouping_iterator.c>
> +
> +#include <stdio.h>
> +#include <support/check.h>
> +#include <support/support.h>
> +#include <support/test-driver.h>
> +
> +static void
> +check (int lineno, const char *groupings,
> + const char *input, const char *expected)
> +{
> + if (test_verbose)
> + {
> + printf ("info: %s:%d: \"%s\" via \"", __FILE__, lineno, input);
> + for (const char *p = groupings; *p != 0; ++p)
> + printf ("\\%o", *p & 0xff);
> + printf ("\" to \"%s\"\n", expected);
> + }
> +
> + size_t initial_group = strchrnul (expected, '\'') - expected;
> + size_t separators = 0;
> + for (const char *p = expected; *p != '\0'; ++p)
> + separators += *p == '\'';
> +
> + size_t digits = strlen (input);
> + char *out = xmalloc (2 * digits + 1);
> +
> + struct grouping_iterator it;
> + TEST_COMPARE (grouping_iterator_setup (&it, digits, groupings),
> + strchr (expected, '\'') != NULL);
> + TEST_COMPARE (it.remaining, digits);
> + TEST_COMPARE (it.remaining_in_current_group, initial_group);
> + TEST_COMPARE (it.separators, separators);
> +
> + char *p = out;
> + while (*input != '\0')
> + {
> + if (__grouping_iterator_next (&it))
> + *p++ = '\'';
> + TEST_COMPARE (it.separators, separators);
> + *p++ = *input++;
> + }
> + *p++ = '\0';
> +
> + TEST_COMPARE (it.remaining, 0);
> + TEST_COMPARE (it.remaining_in_current_group, 0);
> +
> + TEST_COMPARE_STRING (out, expected);
> +
> + free (out);
> +}
> +
> +static int
> +do_test (void)
> +{
> + check (__LINE__, "", "1", "1");
> + check (__LINE__, "", "12", "12");
> + check (__LINE__, "", "123", "123");
> + check (__LINE__, "", "1234", "1234");
> +
> + check (__LINE__, "\3", "1", "1");
> + check (__LINE__, "\3", "12", "12");
> + check (__LINE__, "\3", "123", "123");
> + check (__LINE__, "\3", "1234", "1'234");
> + check (__LINE__, "\3", "12345", "12'345");
> + check (__LINE__, "\3", "123456", "123'456");
> + check (__LINE__, "\3", "1234567", "1'234'567");
> + check (__LINE__, "\3", "12345678", "12'345'678");
> + check (__LINE__, "\3", "123456789", "123'456'789");
> + check (__LINE__, "\3", "1234567890", "1'234'567'890");
> +
> + check (__LINE__, "\2\3", "1", "1");
> + check (__LINE__, "\2\3", "12", "12");
> + check (__LINE__, "\2\3", "123", "1'23");
> + check (__LINE__, "\2\3", "1234", "12'34");
> + check (__LINE__, "\2\3", "12345", "123'45");
> + check (__LINE__, "\2\3", "123456", "1'234'56");
> + check (__LINE__, "\2\3", "1234567", "12'345'67");
> + check (__LINE__, "\2\3", "12345678", "123'456'78");
> + check (__LINE__, "\2\3", "123456789", "1'234'567'89");
> + check (__LINE__, "\2\3", "1234567890", "12'345'678'90");
> +
> + check (__LINE__, "\3\2", "1", "1");
> + check (__LINE__, "\3\2", "12", "12");
> + check (__LINE__, "\3\2", "123", "123");
> + check (__LINE__, "\3\2", "1234", "1'234");
> + check (__LINE__, "\3\2", "12345", "12'345");
> + check (__LINE__, "\3\2", "123456", "1'23'456");
> + check (__LINE__, "\3\2", "1234567", "12'34'567");
> + check (__LINE__, "\3\2", "12345678", "1'23'45'678");
> + check (__LINE__, "\3\2", "123456789", "12'34'56'789");
> + check (__LINE__, "\3\2", "1234567890", "1'23'45'67'890");
> +
> + check (__LINE__, "\3\2\1", "1", "1");
> + check (__LINE__, "\3\2\1", "12", "12");
> + check (__LINE__, "\3\2\1", "123", "123");
> + check (__LINE__, "\3\2\1", "1234", "1'234");
> + check (__LINE__, "\3\2\1", "12345", "12'345");
> + check (__LINE__, "\3\2\1", "123456", "1'23'456");
> + check (__LINE__, "\3\2\1", "1234567", "1'2'34'567");
> + check (__LINE__, "\3\2\1", "12345678", "1'2'3'45'678");
> + check (__LINE__, "\3\2\1", "123456789", "1'2'3'4'56'789");
> + check (__LINE__, "\3\2\1", "1234567890", "1'2'3'4'5'67'890");
> +
> + check (__LINE__, "\2\3\1", "1", "1");
> + check (__LINE__, "\2\3\1", "12", "12");
> + check (__LINE__, "\2\3\1", "123", "1'23");
> + check (__LINE__, "\2\3\1", "1234", "12'34");
> + check (__LINE__, "\2\3\1", "12345", "123'45");
> + check (__LINE__, "\2\3\1", "123456", "1'234'56");
> + check (__LINE__, "\2\3\1", "1234567", "1'2'345'67");
> + check (__LINE__, "\2\3\1", "12345678", "1'2'3'456'78");
> + check (__LINE__, "\2\3\1", "123456789", "1'2'3'4'567'89");
> + check (__LINE__, "\2\3\1", "1234567890", "1'2'3'4'5'678'90");
> +
> + /* No repeats. */
> + check (__LINE__, "\3\377", "1", "1");
> + check (__LINE__, "\3\377", "12", "12");
> + check (__LINE__, "\3\377", "123", "123");
> + check (__LINE__, "\3\377", "1234", "1'234");
> + check (__LINE__, "\3\377", "12345", "12'345");
> + check (__LINE__, "\3\377", "123456", "123'456");
> + check (__LINE__, "\3\377", "1234567", "1234'567");
> + check (__LINE__, "\3\377", "12345678", "12345'678");
> +
> + check (__LINE__, "\2\3\377", "1", "1");
> + check (__LINE__, "\2\3\377", "12", "12");
> + check (__LINE__, "\2\3\377", "123", "1'23");
> + check (__LINE__, "\2\3\377", "1234", "12'34");
> + check (__LINE__, "\2\3\377", "12345", "123'45");
> + check (__LINE__, "\2\3\377", "123456", "1'234'56");
> + check (__LINE__, "\2\3\377", "1234567", "12'345'67");
> + check (__LINE__, "\2\3\377", "12345678", "123'456'78");
> + check (__LINE__, "\2\3\377", "123456789", "1234'567'89");
> + check (__LINE__, "\2\3\377", "1234567890", "12345'678'90");
> +
> + check (__LINE__, "\3\2\377", "1", "1");
> + check (__LINE__, "\3\2\377", "12", "12");
> + check (__LINE__, "\3\2\377", "123", "123");
> + check (__LINE__, "\3\2\377", "1234", "1'234");
> + check (__LINE__, "\3\2\377", "12345", "12'345");
> + check (__LINE__, "\3\2\377", "123456", "1'23'456");
> + check (__LINE__, "\3\2\377", "1234567", "12'34'567");
> + check (__LINE__, "\3\2\377", "12345678", "123'45'678");
> + check (__LINE__, "\3\2\377", "123456789", "1234'56'789");
> + check (__LINE__, "\3\2\377", "1234567890", "12345'67'890");
> +
> + /* Locale-based tests. */
> +
> + locale_t loc;
> + struct lc_ctype_data *ctype;
> + struct grouping_iterator it;
> +
> + loc = newlocale (LC_ALL_MASK, "de_DE.UTF-8", 0);
> + TEST_VERIFY_EXIT (loc != 0);
> + ctype = loc->__locales[LC_CTYPE]->private;
> + TEST_VERIFY (!ctype->outdigit_translation_needed);
> + for (int i = 0; i <= 9; ++i)
> + TEST_COMPARE (ctype->outdigit_bytes[i], 1);
> + TEST_COMPARE (ctype->outdigit_bytes_all_equal, 1);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 2);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 3);
> + TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
> + TEST_COMPARE (it.separators, 2);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 2);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 3);
> + TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
> + TEST_COMPARE (it.separators, 2);
> + freelocale (loc);
> +
> + loc = newlocale (LC_ALL_MASK, "tg_TJ.UTF-8", 0);
> + TEST_VERIFY_EXIT (loc != 0);
> + ctype = loc->__locales[LC_CTYPE]->private;
> + TEST_VERIFY (!ctype->outdigit_translation_needed);
> + for (int i = 0; i <= 9; ++i)
> + TEST_COMPARE (ctype->outdigit_bytes[i], 1);
> + TEST_COMPARE (ctype->outdigit_bytes_all_equal, 1);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 2);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 3);
> + TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
> + TEST_COMPARE (it.separators, 2);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 2);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 3);
> + TEST_COMPARE (it.non_repeating_groups, 3); /* Locale duplicates 3. */
> + TEST_COMPARE (it.separators, 2);
> + freelocale (loc);
> +
> + loc = newlocale (LC_ALL_MASK, "hi_IN.UTF-8", 0);
> + TEST_VERIFY_EXIT (loc != 0);
> + ctype = loc->__locales[LC_CTYPE]->private;
> + TEST_VERIFY (ctype->outdigit_translation_needed);
> + for (int i = 0; i <= 9; ++i)
> + /* Locale uses Devanagari digits. */
> + TEST_COMPARE (ctype->outdigit_bytes[i], 3);
> + TEST_COMPARE (ctype->outdigit_bytes_all_equal, 3);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 2);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 3);
> + TEST_COMPARE (it.non_repeating_groups, 0);
> + TEST_COMPARE (it.separators, 2);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 1);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 2);
> + TEST_COMPARE (it.non_repeating_groups, 3);
> + TEST_COMPARE (it.separators, 3);
> + freelocale (loc);
> +
> + loc = newlocale (LC_ALL_MASK, "ps_AF.UTF-8", 0);
> + TEST_VERIFY_EXIT (loc != 0);
> + ctype = loc->__locales[LC_CTYPE]->private;
> + TEST_VERIFY (ctype->outdigit_translation_needed);
> + for (int i = 0; i <= 9; ++i)
> + /* Locale uses non-ASCII digits. */
> + TEST_COMPARE (ctype->outdigit_bytes[i], 2);
> + TEST_COMPARE (ctype->outdigit_bytes_all_equal, 2);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_NUMERIC, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 2);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 3);
> + TEST_COMPARE (it.non_repeating_groups, 0);
> + TEST_COMPARE (it.separators, 2);
> + TEST_COMPARE (__grouping_iterator_init (&it, LC_MONETARY, loc, 8), true);
> + TEST_COMPARE (it.remaining_in_current_group, 2);
> + TEST_COMPARE (it.remaining, 8);
> + TEST_COMPARE (*it.groupings, 3);
> + TEST_COMPARE (it.non_repeating_groups, 0);
> + TEST_COMPARE (it.separators, 2);
> + freelocale (loc);
> +
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
Ok.
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 08/14] stdio-common: Convert vfprintf and related functions to buffers
2022-05-23 14:07 ` [PATCH v2 08/14] stdio-common: Convert vfprintf and related functions to buffers Florian Weimer
@ 2022-05-23 20:23 ` Joseph Myers
2022-05-23 20:48 ` Florian Weimer
0 siblings, 1 reply; 36+ messages in thread
From: Joseph Myers @ 2022-05-23 20:23 UTC (permalink / raw)
To: Florian Weimer; +Cc: libc-alpha
On Mon, 23 May 2022, Florian Weimer via Libc-alpha wrote:
> In general, stack buffer usage is greatly reduced, particularly for
> unbuffered input streams. __printf_fp can still use a large buffer
> in binary128 mode for %g, though.
Apart from stack usage (already bounded, I think), there is also the issue
of malloc usage in printf functions for floating point (which ideally
wouldn't be needed at all - all digits beyond the 16494th after the
decimal point are always zero for any supported floating-point format).
Do I understand correctly from this patch that there are still dynamic
allocations depending on the precision (bug 21127) - but that because of
changes to how outdigits are implemented, the specific calculation
described in bug 26201 (that was potentially overflowing on 32-bit systems
before the changes to stop allowing allocations of half the address space
or more) is gone?
--
Joseph S. Myers
joseph@codesourcery.com
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 08/14] stdio-common: Convert vfprintf and related functions to buffers
2022-05-23 20:23 ` Joseph Myers
@ 2022-05-23 20:48 ` Florian Weimer
0 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-23 20:48 UTC (permalink / raw)
To: Joseph Myers; +Cc: libc-alpha
* Joseph Myers:
> On Mon, 23 May 2022, Florian Weimer via Libc-alpha wrote:
>
>> In general, stack buffer usage is greatly reduced, particularly for
>> unbuffered input streams. __printf_fp can still use a large buffer
>> in binary128 mode for %g, though.
>
> Apart from stack usage (already bounded, I think), there is also the issue
> of malloc usage in printf functions for floating point (which ideally
> wouldn't be needed at all - all digits beyond the 16494th after the
> decimal point are always zero for any supported floating-point format).
> Do I understand correctly from this patch that there are still dynamic
> allocations depending on the precision (bug 21127) - but that because of
> changes to how outdigits are implemented, the specific calculation
> described in bug 26201 (that was potentially overflowing on 32-bit systems
> before the changes to stop allowing allocations of half the address space
> or more) is gone?
The code still has
fracdig_min = fracdig_max = info->prec < 0 ? 6 : info->prec;
chars_needed = 1 + 1 + (size_t) fracdig_max + 1 + 1 + 4;
and chars_needed controls the allocation size more or less directly. So
there's still unbounded memory usage depending on precision.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 04/14] locale: Implement struct grouping_iterator
2022-05-23 14:07 ` [PATCH v2 04/14] locale: Implement struct grouping_iterator Florian Weimer
2022-05-23 20:00 ` Adhemerval Zanella
@ 2022-05-24 13:31 ` Andreas Schwab
2022-05-24 14:33 ` Florian Weimer
1 sibling, 1 reply; 36+ messages in thread
From: Andreas Schwab @ 2022-05-24 13:31 UTC (permalink / raw)
To: Florian Weimer via Libc-alpha; +Cc: Florian Weimer
On Mai 23 2022, Florian Weimer via Libc-alpha wrote:
> +struct grouping_iterator
> +{
> + /* Number of characters in the current group. If this reaches zero,
> + a thousands separator needs to be emittted. */
> + size_t remaining_in_current_group;
> +
> + /* Number of characters remaining in the number. This is used to
> + detect the start of the non-repeating groups. */
> + size_t remaining;
> +
> + /* Points to the current grouping descriptor. */
> + const char *groupings;
> +
> + /* Total number of characters in the non-repeating groups. */
> + size_t non_repeating_groups;
> +
> + /* Number of separators that will be inserted if the whole number is
> + processed. (Does not change during iteration.) */
> + size_t separators;
Does that really need the full range of size_t? I think unsigned int
should be enough.
> +};
> +
> +struct __locale_data;
> +
> +/* Initializes *IT with the data from LOCDATA (which must be for
> + LC_MONETARY or LC_NUMERIC). DIGITS is the length of the number.
> + Returns true if grouping is active, false if not. */
> +bool __grouping_iterator_init (struct grouping_iterator *it,
> + int category, locale_t loc,
> + size_t digits) attribute_hidden;
> +
> +/* Initializes *IT with no grouping information for a string of length
> + DIGITS, and return false to indicate no grouping. */
> +bool __grouping_iterator_init_none (struct grouping_iterator *it, size_t digits)
> + attribute_hidden;
Similarily, the digits argument can be unsigned int (format string
lengths are limited by int anyway).
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 04/14] locale: Implement struct grouping_iterator
2022-05-24 13:31 ` Andreas Schwab
@ 2022-05-24 14:33 ` Florian Weimer
0 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-05-24 14:33 UTC (permalink / raw)
To: Andreas Schwab; +Cc: Florian Weimer via Libc-alpha
* Andreas Schwab:
> On Mai 23 2022, Florian Weimer via Libc-alpha wrote:
>
>> +struct grouping_iterator
>> +{
>> + /* Number of characters in the current group. If this reaches zero,
>> + a thousands separator needs to be emittted. */
>> + size_t remaining_in_current_group;
>> +
>> + /* Number of characters remaining in the number. This is used to
>> + detect the start of the non-repeating groups. */
>> + size_t remaining;
>> +
>> + /* Points to the current grouping descriptor. */
>> + const char *groupings;
>> +
>> + /* Total number of characters in the non-repeating groups. */
>> + size_t non_repeating_groups;
>> +
>> + /* Number of separators that will be inserted if the whole number is
>> + processed. (Does not change during iteration.) */
>> + size_t separators;
>
> Does that really need the full range of size_t? I think unsigned int
> should be enough.
>
>> +};
>> +
>> +struct __locale_data;
>> +
>> +/* Initializes *IT with the data from LOCDATA (which must be for
>> + LC_MONETARY or LC_NUMERIC). DIGITS is the length of the number.
>> + Returns true if grouping is active, false if not. */
>> +bool __grouping_iterator_init (struct grouping_iterator *it,
>> + int category, locale_t loc,
>> + size_t digits) attribute_hidden;
>> +
>> +/* Initializes *IT with no grouping information for a string of length
>> + DIGITS, and return false to indicate no grouping. */
>> +bool __grouping_iterator_init_none (struct grouping_iterator *it, size_t digits)
>> + attribute_hidden;
>
> Similarily, the digits argument can be unsigned int (format string
> lengths are limited by int anyway).
Yes, switching to unsigned int should work. I will make the change and
re-test.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-05-23 14:07 ` [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf Florian Weimer
@ 2022-06-02 17:16 ` Adhemerval Zanella
2022-06-02 17:58 ` Florian Weimer
2022-06-02 18:48 ` Adhemerval Zanella
2022-06-07 16:57 ` Paul Eggert
2 siblings, 1 reply; 36+ messages in thread
From: Adhemerval Zanella @ 2022-06-02 17:16 UTC (permalink / raw)
To: Florian Weimer, libc-alpha
On 23/05/2022 11:07, Florian Weimer via Libc-alpha wrote:
> These buffers will eventually be used instead of FILE * objects
> to implement printf functions. The multibyte buffer is struct
> __printf_buffer, the wide buffer is struct __wprintf_buffer.
>
> To enable writing type-generic code, the header files
> printf_buffer-char.h and printf_buffer-wchar_t.h define the
> Xprintf macro differently, enabling Xprintf (buffer) to stand
> for __printf_buffer and __wprintf_buffer as appropriate. For
> common cases, macros like Xprintf_buffer are provided as a more
> syntactically convenient shortcut.
>
> Buffer-specific flush callbacks are implemented with a switch
> statement instead of a function pointer, to avoid hardening issues
> similar to those of libio vtables. struct __printf_buffer_as_file
> is needed to support custom printf specifiers because the public
> interface for that requires passing a FILE *, which is why there
> is a trapdoor back from these buffers to FILE * streams.
>
> Since the immediate user of these interfaces knows when processing
> has finished, there is no flush callback for the end of processing,
> only a flush callback for the intermediate buffer flush.
Some comments below. I am not very found on this approach, it is *another*
layer on our already convoluted libio/stdio code; although I don't have a
better solution. I *really* wish we could move away from libio...
> ---
> include/printf_buffer.h | 281 ++++++++++++++++++++++++++
> stdio-common/Makefile | 16 ++
> stdio-common/Xprintf_buffer_done.c | 40 ++++
> stdio-common/Xprintf_buffer_flush.c | 72 +++++++
> stdio-common/Xprintf_buffer_pad_1.c | 44 ++++
> stdio-common/Xprintf_buffer_putc_1.c | 29 +++
> stdio-common/Xprintf_buffer_puts_1.c | 37 ++++
> stdio-common/Xprintf_buffer_write.c | 43 ++++
> stdio-common/printf_buffer-char.h | 24 +++
> stdio-common/printf_buffer-wchar_t.h | 24 +++
> stdio-common/printf_buffer_as_file.c | 148 ++++++++++++++
> stdio-common/printf_buffer_as_file.h | 87 ++++++++
> stdio-common/printf_buffer_done.c | 21 ++
> stdio-common/printf_buffer_flush.c | 42 ++++
> stdio-common/printf_buffer_pad_1.c | 21 ++
> stdio-common/printf_buffer_putc_1.c | 21 ++
> stdio-common/printf_buffer_puts_1.c | 21 ++
> stdio-common/printf_buffer_to_file.c | 122 +++++++++++
> stdio-common/printf_buffer_to_file.h | 57 ++++++
> stdio-common/printf_buffer_write.c | 21 ++
> stdio-common/wprintf_buffer_as_file.c | 153 ++++++++++++++
> stdio-common/wprintf_buffer_done.c | 21 ++
> stdio-common/wprintf_buffer_flush.c | 36 ++++
> stdio-common/wprintf_buffer_pad_1.c | 21 ++
> stdio-common/wprintf_buffer_putc_1.c | 21 ++
> stdio-common/wprintf_buffer_puts_1.c | 21 ++
> stdio-common/wprintf_buffer_to_file.c | 55 +++++
> stdio-common/wprintf_buffer_write.c | 21 ++
> 28 files changed, 1520 insertions(+)
> create mode 100644 include/printf_buffer.h
> create mode 100644 stdio-common/Xprintf_buffer_done.c
> create mode 100644 stdio-common/Xprintf_buffer_flush.c
> create mode 100644 stdio-common/Xprintf_buffer_pad_1.c
> create mode 100644 stdio-common/Xprintf_buffer_putc_1.c
> create mode 100644 stdio-common/Xprintf_buffer_puts_1.c
> create mode 100644 stdio-common/Xprintf_buffer_write.c
> create mode 100644 stdio-common/printf_buffer-char.h
> create mode 100644 stdio-common/printf_buffer-wchar_t.h
> create mode 100644 stdio-common/printf_buffer_as_file.c
> create mode 100644 stdio-common/printf_buffer_as_file.h
> create mode 100644 stdio-common/printf_buffer_done.c
> create mode 100644 stdio-common/printf_buffer_flush.c
> create mode 100644 stdio-common/printf_buffer_pad_1.c
> create mode 100644 stdio-common/printf_buffer_putc_1.c
> create mode 100644 stdio-common/printf_buffer_puts_1.c
> create mode 100644 stdio-common/printf_buffer_to_file.c
> create mode 100644 stdio-common/printf_buffer_to_file.h
> create mode 100644 stdio-common/printf_buffer_write.c
> create mode 100644 stdio-common/wprintf_buffer_as_file.c
> create mode 100644 stdio-common/wprintf_buffer_done.c
> create mode 100644 stdio-common/wprintf_buffer_flush.c
> create mode 100644 stdio-common/wprintf_buffer_pad_1.c
> create mode 100644 stdio-common/wprintf_buffer_putc_1.c
> create mode 100644 stdio-common/wprintf_buffer_puts_1.c
> create mode 100644 stdio-common/wprintf_buffer_to_file.c
> create mode 100644 stdio-common/wprintf_buffer_write.c
>
> diff --git a/include/printf_buffer.h b/include/printf_buffer.h
> new file mode 100644
> index 0000000000..6be7723869
> --- /dev/null
> +++ b/include/printf_buffer.h
> @@ -0,0 +1,281 @@
> +/* Multibyte and wide buffers for implementing printf-related functions.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +/* The naming of the multibyte and wide variants is intentionally
> + consistent, so that it is possible to use the Xprintf macro in
> + stdio-common/printf_buffer-char.h and
> + stdio-common/printf_buffer-wchar_t.h to select between them in
> + type-generic code. */
> +
> +#ifndef PRINTF_BUFFER_H
> +#define PRINTF_BUFFER_H
> +
> +#include <stdbool.h>
> +#include <stdint.h>
> +#include <wchar.h>
> +
> +/* <printf_buffer_as_file.h> introduces a way to use struct
> + __printf_buffer objects from FILE * streams. To avoid storing a
> + function pointer (or vtable pointer) in struct __printf_buffer
> + (which would defeat libio vtable hardening), a switch statement
> + over the different flush implementations is used to implement
> + __printf_buffer_flush.
> +
> + __printf_buffer_mode_failed is special: it is the sticky failure
> + indicator. Unlike struct alloc_buffer, this is not folded into
> + write_ptr, so that snprintf and other string-writing functions can
> + discover the end of the string even in the error case, to be able
> + to add the null terminator. */
> +enum __printf_buffer_mode
> + {
> + __printf_buffer_mode_failed,
> + __printf_buffer_mode_to_file,
> + };
Do we really need to use namespace safe names for types as well? I usually
think it is usually clear to use otherwise.
> +
> +/* Buffer for fast character writing with overflow handling.
> + Typically embedded in another struct with further data that is used
> + by the flush function. */
> +struct __printf_buffer
> +{
> + /* These pointer members follow FILE streams. write_ptr and
> + write_end must be initialized to cover the target buffer. See
> + __printf_buffer_init.
> +
> + Data can be written directly to *write_ptr while write_ptr !=
> + write_end, and write_ptr can be advanced accordingly. Note that
> + is not possible to use the apparently-unused part of the buffer
> + as scratch space because sprintf (and snprintf, but that is a bit
> + iffy) must only write the minimum number of characters produced
> + by the format string and its arguments.
> +
> + write_base must be initialized to be equal to write_ptr. The
> + framework uses this pointer to compute the total number of
> + written bytes, together with the written field. See
> + __printf_buffer_done.
> +
> + write_base and write_end are only read by the generic functions
> + after initialization, only the flush implementation called from
> + __printf_buffer_flush might change these pointers. See the
> + comment on Xprintf (buffer_do_flush) in Xprintf_buffer_flush.c
> + for details regarding the flush operation. */
> + char *write_base;
> + char *write_ptr;
> + char *write_end;
> +
> + /* Number of characters written so far (excluding the current
> + buffer). Potentially updated on flush. The actual number of
> + written bytes also inclused the unflushed-but-written buffer
> + part, write_ptr - write_base. A 64-bit value is used to avoid
> + the need for overflow checks. */
> + uint64_t written;
> +
> + /* Identifies the flush callback. */
> + enum __printf_buffer_mode mode;
> +};
> +
> +/* Marks the buffer as failed, so that __printf_buffer_has_failed
> + returns true and future flush operations are no-ops. */
> +static inline void
> +__printf_buffer_mark_failed (struct __printf_buffer *buf)
For other internal interfaces it seems that current pratice is to use
non double underscore static inline function wrappers over the namespace
safe symbols. Maybe we should use the same strategy here.
> +{
> + buf->mode = __printf_buffer_mode_failed;
> +}
> +
> +/* Returns true if the sticky error indicator of the buffer has been
> + set to failed. */
> +static inline bool __attribute_warn_unused_result__
> +__printf_buffer_has_failed (struct __printf_buffer *buf)
> +{
> + return buf->mode == __printf_buffer_mode_failed;
> +}
> +
> +/* Initialization of a buffer, using the memory region from [BASE, BASE +LEN)
> + as the initial buffer contents. LEN can be zero. */
> +static inline void
> +__printf_buffer_init (struct __printf_buffer *buf, char *base, size_t len,
> + enum __printf_buffer_mode mode)
> +{
> + buf->write_base = base;
> + buf->write_ptr = base;
> + buf->write_end = base + len;
> + buf->written = 0;
> + buf->mode = mode;
> +}
> +
> +/* Called by printf_buffer_putc for a full buffer. */
> +void __printf_buffer_putc_1 (struct __printf_buffer *buf, char ch)
> + attribute_hidden;
> +
> +/* Writes CH to BUF. */
> +static inline void
> +__printf_buffer_putc (struct __printf_buffer *buf, char ch)
> +{
> + if (buf->write_ptr != buf->write_end)
> + *buf->write_ptr++ = ch;
> + else
> + __printf_buffer_putc_1 (buf, ch);
> +}
> +
> +/* Writes COUNT repeats of CH to BUF. */
> +void __printf_buffer_pad_1 (struct __printf_buffer *buf,
> + char ch, size_t count) attribute_hidden;
> +
> +/* __printf_buffer_pad with fast path for no padding. COUNT is a
> + long int, to accomodate signed uses in printf and elsewhere. */
> +static inline void
> +__printf_buffer_pad (struct __printf_buffer *buf, char ch, long int count)
> +{
> + if (count > 0)
> + __printf_buffer_pad_1 (buf, ch, count);
> +}
> +
> +/* Write COUNT bytes starting at S to BUF. S must not overlap with
> + the internal buffer. */
Maybe add a overlpa check on Xprintf_buffer_write.c ? Not sure if it is
worth though.
> +void __printf_buffer_write (struct __printf_buffer *buf, const char *s,
> + size_t count) attribute_hidden;
> +
> +/* Write S to BUF. S must not overlap with the internal buffer. */
> +void __printf_buffer_puts_1 (struct __printf_buffer *buf, const char *s)
> + attribute_hidden;
> +static inline void
> +__printf_buffer_puts (struct __printf_buffer *buf, const char *s)
> +{
> + if (__builtin_constant_p (__builtin_strlen (s)))
> + __printf_buffer_write (buf, s, __builtin_strlen (s));
> + else
> + __printf_buffer_puts_1 (buf, s);
> +}
> +
> +/* Returns the number of bytes written through the buffer, or -1 if
> + there was an error (that is, __printf_buffer_has_failed (BUF) is true).
> +
> + The number of written bytes includes pending bytes in the buffer
> + (between BUF->write_base and BUF->write_ptr).
> +
> + If the number is larger than INT_MAX, returns -1 and sets errno to
> + EOVERFLOW. This function does not flush the buffer. If the caller
> + needs the side effect of flushing, it has to do this
> + separately. */
> +int __printf_buffer_done (struct __printf_buffer *buf) attribute_hidden;
> +
> +/* Internally used to call the flush function. This can be called
> + explicitly for certain modes to flush the buffer prematuraly. In
> + such cases, it is often the case that the buffer mode is statically
> + known, and the flush implementation can be called directly. */
> +bool __printf_buffer_flush (struct __printf_buffer *buf) attribute_hidden;
> +
> +/* Wide version of struct __printf_buffer follows. */
> +
> +enum __wprintf_buffer_mode
> + {
> + __wprintf_buffer_mode_failed,
> + __wprintf_buffer_mode_to_file,
> + };
> +
> +struct __wprintf_buffer
> +{
> + wchar_t *write_base;
> + wchar_t *write_ptr;
> + wchar_t *write_end;
> + uint64_t written;
> + enum __wprintf_buffer_mode mode;
> +};
> +
> +static inline void
> +__wprintf_buffer_mark_failed (struct __wprintf_buffer *buf)
> +{
> + buf->mode = __wprintf_buffer_mode_failed;
> +}
> +
> +static inline bool __attribute_warn_unused_result__
> +__wprintf_buffer_has_failed (struct __wprintf_buffer *buf)
> +{
> + return buf->mode == __wprintf_buffer_mode_failed;
> +}
> +
> +static inline void
> +__wprintf_buffer_init (struct __wprintf_buffer *buf,
> + wchar_t *base, size_t len,
> + enum __wprintf_buffer_mode mode)
> +{
> + buf->write_base = base;
> + buf->write_ptr = base;
> + buf->write_end = base + len;
> + buf->written = 0;
> + buf->mode = mode;
> +}
> +
> +void __wprintf_buffer_putc_1 (struct __wprintf_buffer *buf, wchar_t ch)
> + attribute_hidden;
> +
> +static inline void
> +__wprintf_buffer_putc (struct __wprintf_buffer *buf, wchar_t ch)
> +{
> + if (buf->write_ptr != buf->write_end)
> + *buf->write_ptr++ = ch;
> + else
> + __wprintf_buffer_putc_1 (buf, ch);
> +}
> +
> +void __wprintf_buffer_pad_1 (struct __wprintf_buffer *buf,
> + wchar_t ch, size_t count) attribute_hidden;
> +
> +static inline void
> +__wprintf_buffer_pad (struct __wprintf_buffer *buf, char ch, long int count)
> +{
> + if (count > 0)
> + __wprintf_buffer_pad_1 (buf, ch, count);
> +}
> +
> +void __wprintf_buffer_write (struct __wprintf_buffer *buf, const wchar_t *s,
> + size_t count) attribute_hidden;
> +
> +void __wprintf_buffer_puts (struct __wprintf_buffer *buf, const wchar_t *s)
> + attribute_hidden;
> +
> +int __wprintf_buffer_done (struct __wprintf_buffer *buf) attribute_hidden;
> +
> +bool __wprintf_buffer_flush (struct __wprintf_buffer *buf) attribute_hidden;
> +
> +/* Type-generic convenience macros. They are useful if
> + printf_buffer-char.h or printf_buffer-wchar_t.h is included as
> + well. */
> +
> +#define Xprintf_buffer Xprintf (buffer)
> +#define Xprintf_buffer_done Xprintf (buffer_done)
> +#define Xprintf_buffer_flush Xprintf (buffer_flush)
> +#define Xprintf_buffer_has_failed Xprintf (buffer_has_failed)
> +#define Xprintf_buffer_mark_failed Xprintf (buffer_mark_failed)
> +#define Xprintf_buffer_pad Xprintf (buffer_pad)
> +#define Xprintf_buffer_putc Xprintf (buffer_putc)
> +#define Xprintf_buffer_puts Xprintf (buffer_puts)
> +#define Xprintf_buffer_write Xprintf (buffer_write)
> +
> +/* Flush function implementations follow. They are called from
> + __printf_buffer_flush. Generic code should not call these flush
> + functions directly. Some modes have inline implementations. */
> +
> +struct __printf_buffer_to_file;
> +void __printf_buffer_flush_to_file (struct __printf_buffer_to_file *)
> + attribute_hidden;
> +
> +struct __wprintf_buffer_to_file;
> +void __wprintf_buffer_flush_to_file (struct __wprintf_buffer_to_file *)
> + attribute_hidden;
> +
> +#endif /* PRINTF_BUFFER_H */
> diff --git a/stdio-common/Makefile b/stdio-common/Makefile
> index da3a3bc0c9..5ba381fe41 100644
> --- a/stdio-common/Makefile
> +++ b/stdio-common/Makefile
> @@ -53,6 +53,14 @@ routines := \
> perror \
> printf \
> printf-prs \
> + printf_buffer_as_file \
> + printf_buffer_done \
> + printf_buffer_flush \
> + printf_buffer_pad_1 \
> + printf_buffer_putc_1 \
> + printf_buffer_puts_1 \
> + printf_buffer_to_file \
> + printf_buffer_write \
> printf_fp \
> printf_fphex \
> printf_size \
> @@ -85,6 +93,14 @@ routines := \
> vfwscanf \
> vfwscanf-internal \
> vprintf \
> + wprintf_buffer_as_file \
> + wprintf_buffer_done \
> + wprintf_buffer_flush \
> + wprintf_buffer_pad_1 \
> + wprintf_buffer_putc_1 \
> + wprintf_buffer_puts_1 \
> + wprintf_buffer_to_file \
> + wprintf_buffer_write \
> # routines
>
> aux := \
> diff --git a/stdio-common/Xprintf_buffer_done.c b/stdio-common/Xprintf_buffer_done.c
> new file mode 100644
> index 0000000000..c7551979af
> --- /dev/null
> +++ b/stdio-common/Xprintf_buffer_done.c
> @@ -0,0 +1,40 @@
> +/* Final status reporting for struct __*printf_buffer. Generic version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <errno.h>
> +#include <limits.h>
> +#include <stdint.h>
> +
> +int
> +Xprintf_buffer_done (struct Xprintf_buffer *buf)
> +{
> + if (Xprintf_buffer_has_failed (buf))
> + return -1;
> +
> + /* Use uintptr_t to deal with ptrdiff_t overflows (to some degree). */
I am not sure using uintptr_t yield any gain in fact, if
'buf->write_ptr - buf->write_base' can not fit in ptrdiff_t it means the
code already trigger UB in write_ptr update.
> + uintptr_t written_current = buf->write_ptr - buf->write_base;
> + unsigned int written_total;
> + if (__builtin_add_overflow (buf->written, written_current, &written_total)
I think it should use INT_ADD_OVERFLOW since we still support GCC 6.5 and
__builtin_{add,sub}_overflow is not reliable with GCC 6.X [1].
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98269
> + || buf->written > INT_MAX)
> + {
> + __set_errno (EOVERFLOW);
> + return -1;
> + }
> + else
> + return written_total;
> +}
> diff --git a/stdio-common/Xprintf_buffer_flush.c b/stdio-common/Xprintf_buffer_flush.c
> new file mode 100644
> index 0000000000..1368cfe684
> --- /dev/null
> +++ b/stdio-common/Xprintf_buffer_flush.c
> @@ -0,0 +1,72 @@
> +/* Flush wrapper for struct __*printf_buffer. Generic version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +
> +#include <assert.h>
> +#include <stdint.h>
> +
> +/* Xprintf (buffer_do_flush) (BUF) performs the flush operation. The
> + actual implementation is specific to the multibyte and wide
> + variants.
> +
> + If the flush fails, Xprintf_buffer_mark_failed (BUF) must be
> + called, and BUF->write_ptr and BUF->write_end can be left
> + unchanged.
> +
> + The function must not do anything if failure has already occurred,
> + that is, if BUF->mode == Xprintf (buffer_mode_failed).
> +
> + The framework implicitly invokes flush with BUF->write_ptr ==
> + BUF->write_end only. (This is particularly relevant to the
> + __sprintf_chk flush, which just calls __chk_fail.) But in some
> + cases, Xprintf_buffer_flush may be called explicitly (when
> + BUF->mode/the backing function is known). In that case, it is
> + possible that BUF->write_ptr < BUF->write_end is true.
> +
> + If the flush succeeds, the pointers are changed so that
> + BUF->write_ptr < BUF->write_end. It is possible to switch to a
> + completely different buffer here. If the buffer is moved, it may
> + be necessary to updated BUF->write_base and BUF->written from the
> + flush function as well.
> +
> + Note that when chaining buffers, in the flush function for the
> + outer buffer (to which data is written first), it is necessary to
> + check for BUF->next->failed (for the inner buffer) and set
> + BUF->base.failed to true (for the outer buffer). This should come
> + towards the end of the outer flush function. Usually, there is
> + also some unwrapping step afterwards; it has to check the outer
> + buffer (BUF->base.failed) and propagate any error to the inner
> + buffer (BUF->next->failed), so essentially in the other
> + direction. */
> +static void Xprintf (buffer_do_flush) (struct Xprintf_buffer *buf);
> +
> +bool
> +Xprintf_buffer_flush (struct Xprintf_buffer *buf)
> +{
> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
> + return false;
> +
> + Xprintf (buffer_do_flush) (buf);
> + if (Xprintf_buffer_has_failed (buf))
> + return false;
> +
> + /* Ensure that the flush has made available some bytes. */
> + assert (buf->write_ptr != buf->write_end);
> + return true;
> +}
> diff --git a/stdio-common/Xprintf_buffer_pad_1.c b/stdio-common/Xprintf_buffer_pad_1.c
> new file mode 100644
> index 0000000000..2be8270ad2
> --- /dev/null
> +++ b/stdio-common/Xprintf_buffer_pad_1.c
> @@ -0,0 +1,44 @@
> +/* Write repeated characters to struct __*printf_buffer. Generic version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <assert.h>
> +#include <string.h>
> +
> +void
> +Xprintf (buffer_pad_1) (struct Xprintf_buffer *buf, CHAR_T ch, size_t count)
> +{
> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
> + return;
> +
> + do
> + {
> + /* Proactively make room. __*printf_buffer_pad has already
> + checked for a zero-length write, so this function is only
> + called when there is actually data to write. */
> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
> + return;
> + assert (buf->write_ptr != buf->write_end);
> + size_t to_fill = buf->write_end - buf->write_ptr;
> + if (to_fill > count)
> + to_fill = count;
> + MEMSET (buf->write_ptr, ch, to_fill);
> + buf->write_ptr += to_fill;
> + count -= to_fill;
> + }
> + while (count > 0);
> +}
> diff --git a/stdio-common/Xprintf_buffer_putc_1.c b/stdio-common/Xprintf_buffer_putc_1.c
> new file mode 100644
> index 0000000000..3458775a1c
> --- /dev/null
> +++ b/stdio-common/Xprintf_buffer_putc_1.c
> @@ -0,0 +1,29 @@
> +/* Overflow write function for struct __*printf_buffer. Generic version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <assert.h>
> +
> +void
> +Xprintf (buffer_putc_1) (struct Xprintf_buffer *buf, CHAR_T ch)
> +{
> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf))
> + || !Xprintf_buffer_flush (buf))
> + return;
> + assert (buf->write_ptr < buf->write_end);
> + *buf->write_ptr++ = ch;
> +}
> diff --git a/stdio-common/Xprintf_buffer_puts_1.c b/stdio-common/Xprintf_buffer_puts_1.c
> new file mode 100644
> index 0000000000..d8ee7ef47e
> --- /dev/null
> +++ b/stdio-common/Xprintf_buffer_puts_1.c
> @@ -0,0 +1,37 @@
> +/* String write function for struct __*printf_buffer. Generic version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <assert.h>
> +#include <string.h>
> +
> +void
> +Xprintf (buffer_puts_1) (struct Xprintf_buffer *buf, const CHAR_T *s)
> +{
> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
> + return;
> +
> + while (*s != 0)
> + {
> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
> + return;
> + assert (buf->write_ptr != buf->write_end);
> + size_t to_copy = STRNLEN (s, buf->write_end - buf->write_ptr);
> + buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
> + s += to_copy;
> + }
> +}
Does it really need a loop here?
> diff --git a/stdio-common/Xprintf_buffer_write.c b/stdio-common/Xprintf_buffer_write.c
> new file mode 100644
> index 0000000000..fc6ad5fdd1
> --- /dev/null
> +++ b/stdio-common/Xprintf_buffer_write.c
> @@ -0,0 +1,43 @@
> +/* Blob write function for struct __*printf_buffer. Generic version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +
> +#include <assert.h>
> +#include <string.h>
> +
> +void
> +Xprintf_buffer_write (struct Xprintf_buffer *buf,
> + const CHAR_T *s, size_t count)
> +{
> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
> + return;
> +
> + while (count > 0)
> + {
> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
> + return;
> + assert (buf->write_ptr != buf->write_end);
> + size_t to_copy = buf->write_end - buf->write_ptr;
> + if (to_copy > count)
> + to_copy = count;
> + buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
> + s += to_copy;
> + count -= to_copy;
> + }
> +}
As before, I trying to understand why we need a loop here.
> diff --git a/stdio-common/printf_buffer-char.h b/stdio-common/printf_buffer-char.h
> new file mode 100644
> index 0000000000..88eb326a45
> --- /dev/null
> +++ b/stdio-common/printf_buffer-char.h
> @@ -0,0 +1,24 @@
> +/* Macros for the multibyte (char) implementation of struct __printf_buffer.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#define Xprintf(n) __printf_##n
> +
> +#define CHAR_T char
> +#define MEMPCPY __mempcpy
> +#define MEMSET memset
> +#define STRNLEN __strnlen
> diff --git a/stdio-common/printf_buffer-wchar_t.h b/stdio-common/printf_buffer-wchar_t.h
> new file mode 100644
> index 0000000000..7597dc2eab
> --- /dev/null
> +++ b/stdio-common/printf_buffer-wchar_t.h
> @@ -0,0 +1,24 @@
> +/* Macros for wide (wchar_t) implementation of struct __wprintf_buffer.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#define Xprintf(n) __wprintf_##n
> +
> +#define CHAR_T wchar_t
> +#define MEMPCPY __wmempcpy
> +#define MEMSET __wmemset
> +#define STRNLEN __wcsnlen
> diff --git a/stdio-common/printf_buffer_as_file.c b/stdio-common/printf_buffer_as_file.c
> new file mode 100644
> index 0000000000..f27b000d78
> --- /dev/null
> +++ b/stdio-common/printf_buffer_as_file.c
> @@ -0,0 +1,148 @@
> +/* FILE * interface to a struct __printf_buffer. Multibyte version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer_as_file.h>
> +
> +#include <assert.h>
> +#include <printf_buffer.h>
> +
> +/* Commit the data directly written through the stdio stream. */
> +static void
> +__printf_buffer_as_file_commit (struct __printf_buffer_as_file *file)
> +{
> + /* Check that the write pointers in the file stream are consistent
> + with the next buffer. */
> + assert (file->stream._IO_write_ptr >= file->next->write_ptr);
> + assert (file->stream._IO_write_ptr <= file->next->write_end);
> + assert (file->stream._IO_write_base == file->next->write_base);
> + assert (file->stream._IO_write_end == file->next->write_end);
> +
> + file->next->write_ptr = file->stream._IO_write_ptr;
> +}
> +
> +/* Pointer the FILE * write buffer into the active printf_buffer
> + area. */
> +static void
> +__printf_buffer_as_file_switch_to_buffer (struct __printf_buffer_as_file *file)
> +{
> + file->stream._IO_write_base = file->next->write_base;
> + file->stream._IO_write_ptr = file->next->write_ptr;
> + file->stream._IO_write_end = file->next->write_end;
> +}
> +
> +/* Only a small subset of the vtable functions is implemented here,
> + following _IO_obstack_jumps. */
> +
> +static int
> +__printf_buffer_as_file_overflow (FILE *fp, int ch)
> +{
> + struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
> +
> + __printf_buffer_as_file_commit (file);
> +
> + /* EOF means only a flush is requested. */
> + if (ch != EOF)
> + __printf_buffer_putc (file->next, ch);
> +
> + /* Ensure that flushing actually produces room. */
> + if (!__printf_buffer_has_failed (file->next)
> + && file->next->write_ptr == file->next->write_end)
> + __printf_buffer_flush (file->next);
> +
> + __printf_buffer_as_file_switch_to_buffer (file);
> +
> + if (!__printf_buffer_has_failed (file->next))
> + return (unsigned char) ch;
> + else
> + return EOF;
> +}
> +
> +static size_t
> +__printf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
> +{
> + struct __printf_buffer_as_file *file = (struct __printf_buffer_as_file *) fp;
> +
> + __printf_buffer_as_file_commit (file);
> +
> + /* Copy the data. */
> + __printf_buffer_write (file->next, buf, len);
> +
> + __printf_buffer_as_file_switch_to_buffer (file);
> +
> + if (!__printf_buffer_has_failed (file->next))
> + return len;
> + else
> + /* We may actually have written something. But the stream is
> + corrupted in this case anyway, so try not to divine the write
> + count here. */
> + return 0;
> +}
> +
> +static const struct _IO_jump_t _IO_printf_buffer_as_file_jumps libio_vtable =
> +{
> + JUMP_INIT_DUMMY,
> + JUMP_INIT(finish, NULL),
> + JUMP_INIT(overflow, __printf_buffer_as_file_overflow),
> + JUMP_INIT(underflow, NULL),
> + JUMP_INIT(uflow, NULL),
> + JUMP_INIT(pbackfail, NULL),
> + JUMP_INIT(xsputn, __printf_buffer_as_file_xsputn),
> + JUMP_INIT(xsgetn, NULL),
> + JUMP_INIT(seekoff, NULL),
> + JUMP_INIT(seekpos, NULL),
> + JUMP_INIT(setbuf, NULL),
> + JUMP_INIT(sync, NULL),
> + JUMP_INIT(doallocate, NULL),
> + JUMP_INIT(read, NULL),
> + JUMP_INIT(write, NULL),
> + JUMP_INIT(seek, NULL),
> + JUMP_INIT(close, NULL),
> + JUMP_INIT(stat, NULL),
> + JUMP_INIT(showmanyc, NULL),
> + JUMP_INIT(imbue, NULL)
> +};
> +
> +void
> +__printf_buffer_as_file_init (struct __printf_buffer_as_file *file,
> + struct __printf_buffer *next)
> +{
> + file->stream._lock = NULL;
> + _IO_no_init (&file->stream, _IO_USER_LOCK, -1, NULL, NULL);
> + file->vtable = &_IO_printf_buffer_as_file_jumps;
> +
> + /* Set up the write buffer from the next buffer. */
> + file->next = next;
> + __printf_buffer_as_file_switch_to_buffer (file);
> +
> + /* Mark the read area as inactive, by making all pointers equal. */
> + file->stream._IO_read_base = file->stream._IO_write_base;
> + file->stream._IO_read_ptr = file->stream._IO_write_base;
> + file->stream._IO_read_end = file->stream._IO_write_base;
> +}
> +
> +bool
> +__printf_buffer_as_file_terminate (struct __printf_buffer_as_file *file)
> +{
> + if (file->stream._flags & _IO_ERR_SEEN)
> + return false;
> + else
> + {
> + __printf_buffer_as_file_commit (file);
> + return true;
> + }
> +}
> diff --git a/stdio-common/printf_buffer_as_file.h b/stdio-common/printf_buffer_as_file.h
> new file mode 100644
> index 0000000000..ab7fa44144
> --- /dev/null
> +++ b/stdio-common/printf_buffer_as_file.h
> @@ -0,0 +1,87 @@
> +/* FILE * interface to a struct __*printf_buffer.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +/* Registered printf format specifier callbacks produce data via a
> + FILE * stream. struct __printf_buffer_as_file enables vfprintf to
> + create a suitable stdio stream. Likewise struct
> + __wprintf_buffer_as_file for vfwprintf. */
> +
> +#ifndef PRINTF_BUFFER_AS_FILE_H
> +#define PRINTF_BUFFER_AS_FILE_H
> +
> +#include <libio/libioP.h>
> +
> +struct __printf_buffer;
> +
> +struct __printf_buffer_as_file
> +{
> + /* Interface to libio. */
> + FILE stream;
> + const struct _IO_jump_t *vtable;
> +
> + /* Pointer to the underlying buffer. */
> + struct __printf_buffer *next;
> +};
> +
> +/* Initialization *FP so that data written to its FILE * stream ends
> + up in NEXT. */
> +void __printf_buffer_as_file_init (struct __printf_buffer_as_file *fp,
> + struct __printf_buffer *next)
> + attribute_hidden;
> +
> +/* Returns the FILE * that can be used to write data to the
> + buffer. */
> +static inline FILE *
> +__printf_buffer_as_file_get (struct __printf_buffer_as_file *file)
> +{
> + return &file->stream;
> +}
> +
> +/* Transfers all pending data from the FILE * to the underlying
> + buffer. Returns true if there have been no errors. */
> +bool __printf_buffer_as_file_terminate (struct __printf_buffer_as_file *)
> + attribute_hidden;
> +
> +/* Wide variant follows. */
> +
> +struct __wprintf_buffer;
> +struct __wprintf_buffer_as_file
> +{
> + /* Interface to libio. */
> + FILE stream;
> + const struct _IO_jump_t *vtable;
> + struct _IO_wide_data wide_stream;
> +
> + /* Pointer to the underlying buffer. */
> + struct __wprintf_buffer *next;
> +};
> +
> +void __wprintf_buffer_as_file_init (struct __wprintf_buffer_as_file *fp,
> + struct __wprintf_buffer *next)
> + attribute_hidden;
> +
> +static inline FILE *
> +__wprintf_buffer_as_file_get (struct __wprintf_buffer_as_file *file)
> +{
> + return &file->stream;
> +}
> +
> +bool __wprintf_buffer_as_file_terminate (struct __wprintf_buffer_as_file *)
> + attribute_hidden;
> +
> +#endif /* PRINTF_BUFFER_AS_FILE_H */
> diff --git a/stdio-common/printf_buffer_done.c b/stdio-common/printf_buffer_done.c
> new file mode 100644
> index 0000000000..5f3df1daad
> --- /dev/null
> +++ b/stdio-common/printf_buffer_done.c
> @@ -0,0 +1,21 @@
> +/* Final status reporting for struct __printf_buffer. Multibyte version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-char.h"
> +#include "Xprintf_buffer_done.c"
> diff --git a/stdio-common/printf_buffer_flush.c b/stdio-common/printf_buffer_flush.c
> new file mode 100644
> index 0000000000..9b25c0fde5
> --- /dev/null
> +++ b/stdio-common/printf_buffer_flush.c
> @@ -0,0 +1,42 @@
> +/* Flush a struct __printf_buffer. Multibyte version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +
> +#include "printf_buffer-char.h"
> +#include "Xprintf_buffer_flush.c"
> +
> +/* The __printf_buffer_flush_* functions are defined together with
> + functions that are pulled in by strong references. */
> +#ifndef SHARED
> +# pragma weak __printf_buffer_flush_to_file
> +#endif /* !SHARED */
Is is an optimization to avoid pulling __printf_buffer_flush_to_file?
> +
> +static void
> +__printf_buffer_do_flush (struct __printf_buffer *buf)
> +{
> + switch (buf->mode)
> + {
> + case __printf_buffer_mode_failed:
> + return;
> + case __printf_buffer_mode_to_file:
> + __printf_buffer_flush_to_file ((struct __printf_buffer_to_file *) buf);
> + return;
> + }
> + __builtin_trap ();
> +}
> diff --git a/stdio-common/printf_buffer_pad_1.c b/stdio-common/printf_buffer_pad_1.c
> new file mode 100644
> index 0000000000..c4b9a7af56
> --- /dev/null
> +++ b/stdio-common/printf_buffer_pad_1.c
> @@ -0,0 +1,21 @@
> +/* Write repeated characters to struct __printf_buffer. Multibyte version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-char.h"
> +#include "Xprintf_buffer_pad_1.c"
> diff --git a/stdio-common/printf_buffer_putc_1.c b/stdio-common/printf_buffer_putc_1.c
> new file mode 100644
> index 0000000000..a15e8d16d1
> --- /dev/null
> +++ b/stdio-common/printf_buffer_putc_1.c
> @@ -0,0 +1,21 @@
> +/* Overflow character write function for struct __printf_buffer.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-char.h"
> +#include "Xprintf_buffer_putc_1.c"
> diff --git a/stdio-common/printf_buffer_puts_1.c b/stdio-common/printf_buffer_puts_1.c
> new file mode 100644
> index 0000000000..ed97fd6b3f
> --- /dev/null
> +++ b/stdio-common/printf_buffer_puts_1.c
> @@ -0,0 +1,21 @@
> +/* String write function for struct __printf_buffer. Multibyte version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-char.h"
> +#include "Xprintf_buffer_puts_1.c"
> diff --git a/stdio-common/printf_buffer_to_file.c b/stdio-common/printf_buffer_to_file.c
> new file mode 100644
> index 0000000000..6aeb954509
> --- /dev/null
> +++ b/stdio-common/printf_buffer_to_file.c
> @@ -0,0 +1,122 @@
> +/* Multibyte printf buffers writing data to a FILE * stream.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer_to_file.h>
> +
> +#include <assert.h>
> +#include <array_length.h>
> +#include <libio/libioP.h>
> +
> +/* Switch to the file buffer if possible. If the file has write_ptr
> + == write_end, use the stage buffer instead. */
> +void
> +__printf_buffer_to_file_switch (struct __printf_buffer_to_file *buf)
> +{
> + if (buf->fp->_IO_write_ptr < buf->fp->_IO_write_end)
> + {
> + /* buf->fp has a buffer associated with it, so write directly to
> + it from now on. */
> + buf->base.write_ptr = buf->fp->_IO_write_ptr;
> + buf->base.write_end = buf->fp->_IO_write_end;
> + }
> + else
> + {
> + /* Use the staging area if no buffer is available in buf->fp. */
> + buf->base.write_ptr = buf->stage;
> + buf->base.write_end = array_end (buf->stage);
> + }
> +
> + buf->base.write_base = buf->base.write_ptr;
> +}
> +
> +void
> +__printf_buffer_flush_to_file (struct __printf_buffer_to_file *buf)
> +{
> + /* The bytes in the buffer are always consumed. */
> + buf->base.written += buf->base.write_ptr - buf->base.write_base;
> +
> + if (buf->base.write_end == array_end (buf->stage))
> + {
> + /* If the stage buffer is used, make a copy into the file. The
> + stage buffer is always consumed fully, even if just partially
> + written, to ensure that the file stream has all the data. */
> + size_t count = buf->base.write_ptr - buf->stage;
> + if ((size_t) _IO_sputn (buf->fp, buf->stage, count) != count)
> + {
> + __printf_buffer_mark_failed (&buf->base);
> + return;
> + }
> + /* buf->fp may have a buffer now. */
> + __printf_buffer_to_file_switch (buf);
> + return;
> + }
> + else if (buf->base.write_end == buf->stage + 1)
> + {
> + /* Special one-character buffer case. This is used to avoid
> + flush-only overflow below. */
> + if (buf->base.write_ptr == buf->base.write_end)
> + {
> + if (__overflow (buf->fp, (unsigned char) *buf->stage) == EOF)
> + {
> + __printf_buffer_mark_failed (&buf->base);
> + return;
> + }
> + __printf_buffer_to_file_switch (buf);
> + }
> + /* Else there is nothing to write. */
> + return;
> + }
> +
> + /* We have written directly into the buf->fp buffer. */
> + assert (buf->base.write_end == buf->fp->_IO_write_end);
> +
> + /* Mark the bytes as written. */
> + buf->fp->_IO_write_ptr = buf->base.write_ptr;
> +
> + if (buf->base.write_ptr == buf->base.write_end)
> + {
> + /* The buffer in buf->fp has been filled. This should just call
> + __overflow (buf->fp, EOF), but flush-only overflow is obscure
> + and not always correctly implemented. See bug 28949. Be
> + conservative and switch to a one-character buffer instead, to
> + obtain one more character for a regular __overflow call. */
> + buf->base.write_ptr = buf->stage;
> + buf->base.write_end = buf->stage + 1;
> + }
> + /* The bytes in the file stream were already marked as written above. */
> +
> + buf->base.write_base = buf->base.write_ptr;
> +}
> +
> +void
> +__printf_buffer_to_file_init (struct __printf_buffer_to_file *buf, FILE *fp)
> +{
> + __printf_buffer_init (&buf->base, buf->stage, array_length (buf->stage),
> + __printf_buffer_mode_to_file);
> + buf->fp = fp;
> + __printf_buffer_to_file_switch (buf);
> +}
> +
> +int
> +__printf_buffer_to_file_done (struct __printf_buffer_to_file *buf)
> +{
> + if (__printf_buffer_has_failed (&buf->base))
> + return -1;
> + __printf_buffer_flush_to_file (buf);
> + return __printf_buffer_done (&buf->base);
> +}
> diff --git a/stdio-common/printf_buffer_to_file.h b/stdio-common/printf_buffer_to_file.h
> new file mode 100644
> index 0000000000..97ec1d6d95
> --- /dev/null
> +++ b/stdio-common/printf_buffer_to_file.h
> @@ -0,0 +1,57 @@
> +/* Multibyte and wide printf buffers writing data to a FILE * stream.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef PRINTF_BUFFER_TO_FILE_H
> +#define PRINTF_BUFFER_TO_FILE_H
> +
> +#include <bits/types/FILE.h>
> +#include <printf_buffer.h>
> +
> +struct __printf_buffer_to_file
> +{
> + struct __printf_buffer base;
> + FILE *fp;
> +
> + /* Staging buffer. All data goes through this buffer before
> + reaching the fp stream. (Any buffer in fp is not yet used.) */
> + char stage[128];
> +};
> +
> +/* Initializes *BUF to write data to FP. */
> +void __printf_buffer_to_file_init (struct __printf_buffer_to_file *buf,
> + FILE *fp) attribute_hidden;
> +
> +/* Transfers any pending data in BUF to BUF->FP. The return value
> + follows the printf convention (number bytes written; or -1 for error). */
> +int __printf_buffer_to_file_done (struct __printf_buffer_to_file *buf)
> + attribute_hidden;
> +
> +/* Wide version below. */
> +
> +struct __wprintf_buffer_to_file
> +{
> + struct __wprintf_buffer base;
> + FILE *fp;
> + wchar_t stage[128];
> +};
> +void __wprintf_buffer_to_file_init (struct __wprintf_buffer_to_file *buf,
> + FILE *fp) attribute_hidden;
> +int __wprintf_buffer_to_file_done (struct __wprintf_buffer_to_file *buf)
> + attribute_hidden;
> +
> +#endif /* PRINTF_BUFFER_TO_FILE_H */
> diff --git a/stdio-common/printf_buffer_write.c b/stdio-common/printf_buffer_write.c
> new file mode 100644
> index 0000000000..1038f69063
> --- /dev/null
> +++ b/stdio-common/printf_buffer_write.c
> @@ -0,0 +1,21 @@
> +/* Blob write function for struct __printf_buffer. Multibyte version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-char.h"
> +#include "Xprintf_buffer_write.c"
> diff --git a/stdio-common/wprintf_buffer_as_file.c b/stdio-common/wprintf_buffer_as_file.c
> new file mode 100644
> index 0000000000..cd48a7d42a
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_as_file.c
> @@ -0,0 +1,153 @@
> +/* FILE * interface to a struct __wprintf_buffer. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer_as_file.h>
> +
> +#include <assert.h>
> +#include <printf_buffer.h>
> +
> +/* Commit the data directly written through the stdio stream. */
> +static void
> +__wprintf_buffer_as_file_commit (struct __wprintf_buffer_as_file *file)
> +{
> + /* Check that the write pointers in the file stream are consistent
> + with the next buffer. */
> + assert (file->wide_stream._IO_write_ptr >= file->next->write_ptr);
> + assert (file->wide_stream._IO_write_ptr <= file->next->write_end);
> + assert (file->wide_stream._IO_write_base == file->next->write_base);
> + assert (file->wide_stream._IO_write_end == file->next->write_end);
> +
> + file->next->write_ptr = file->wide_stream._IO_write_ptr;
> +}
> +
> +/* Pointer the FILE * write buffer into the active struct __wprintf_buffer
> + area. */
> +static void
> +__wprintf_buffer_as_file_switch_to_buffer (struct __wprintf_buffer_as_file *file)
> +{
> + file->wide_stream._IO_write_base = file->next->write_base;
> + file->wide_stream._IO_write_ptr = file->next->write_ptr;
> + file->wide_stream._IO_write_end = file->next->write_end;
> +}
> +
> +/* Only a small subset of the vtable functions is implemented here,
> + following _IO_obstack_jumps. */
> +
> +static wint_t
> +__wprintf_buffer_as_file_overflow (FILE *fp, int ch)
> +{
> + struct __wprintf_buffer_as_file *file
> + = (struct __wprintf_buffer_as_file *) fp;
> +
> + __wprintf_buffer_as_file_commit (file);
> +
> + /* EOF means only a flush is requested. */
> + if (ch != WEOF)
> + __wprintf_buffer_putc (file->next, ch);
> + else
> + ch = 0;
> +
> + /* Ensure that flushing actually produces room. */
> + if (!__wprintf_buffer_has_failed (file->next)
> + && file->next->write_ptr == file->next->write_end)
> + __wprintf_buffer_flush (file->next);
> +
> + __wprintf_buffer_as_file_switch_to_buffer (file);
> +
> + if (!__wprintf_buffer_has_failed (file->next))
> + return (unsigned char) ch;
> + else
> + return WEOF;
> +}
> +
> +static size_t
> +__wprintf_buffer_as_file_xsputn (FILE *fp, const void *buf, size_t len)
> +{
> + struct __wprintf_buffer_as_file *file
> + = (struct __wprintf_buffer_as_file *) fp;
> +
> + __wprintf_buffer_as_file_commit (file);
> +
> + /* Copy the data. */
> + __wprintf_buffer_write (file->next, buf, len);
> +
> + __wprintf_buffer_as_file_switch_to_buffer (file);
> +
> + if (!__wprintf_buffer_has_failed (file->next))
> + return len;
> + else
> + /* We may actually have written something. But the stream is
> + corrupted in this case anyway, so try not to divine the write
> + count here. */
> + return 0;
> +}
> +
> +static const struct _IO_jump_t _IO_wprintf_buffer_as_file_jumps libio_vtable =
> +{
> + JUMP_INIT_DUMMY,
> + JUMP_INIT(finish, NULL),
> + JUMP_INIT(overflow, (_IO_overflow_t) __wprintf_buffer_as_file_overflow),
> + JUMP_INIT(underflow, NULL),
> + JUMP_INIT(uflow, NULL),
> + JUMP_INIT(pbackfail, NULL),
> + JUMP_INIT(xsputn, __wprintf_buffer_as_file_xsputn),
> + JUMP_INIT(xsgetn, NULL),
> + JUMP_INIT(seekoff, NULL),
> + JUMP_INIT(seekpos, NULL),
> + JUMP_INIT(setbuf, NULL),
> + JUMP_INIT(sync, NULL),
> + JUMP_INIT(doallocate, NULL),
> + JUMP_INIT(read, NULL),
> + JUMP_INIT(write, NULL),
> + JUMP_INIT(seek, NULL),
> + JUMP_INIT(close, NULL),
> + JUMP_INIT(stat, NULL),
> + JUMP_INIT(showmanyc, NULL),
> + JUMP_INIT(imbue, NULL)
> +};
> +
> +void
> +__wprintf_buffer_as_file_init (struct __wprintf_buffer_as_file *file,
> + struct __wprintf_buffer *next)
> +{
> + file->stream._lock = NULL;
> + _IO_no_init (&file->stream, _IO_USER_LOCK, 0, &file->wide_stream,
> + &_IO_wprintf_buffer_as_file_jumps);
> + _IO_fwide (&file->stream, 1);
> +
> + /* Set up the write buffer from the next buffer. */
> + file->next = next;
> + __wprintf_buffer_as_file_switch_to_buffer (file);
> +
> + /* Mark the read area as inactive, by making all pointers equal. */
> + file->stream._IO_read_base = file->stream._IO_write_base;
> + file->stream._IO_read_ptr = file->stream._IO_write_base;
> + file->stream._IO_read_end = file->stream._IO_write_base;
> +}
> +
> +bool
> +__wprintf_buffer_as_file_terminate (struct __wprintf_buffer_as_file *file)
> +{
> + if (file->stream._flags & _IO_ERR_SEEN)
> + return false;
> + else
> + {
> + __wprintf_buffer_as_file_commit (file);
> + return true;
> + }
> +}
> diff --git a/stdio-common/wprintf_buffer_done.c b/stdio-common/wprintf_buffer_done.c
> new file mode 100644
> index 0000000000..60eac03955
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_done.c
> @@ -0,0 +1,21 @@
> +/* Final status reporting for struct __wprintf_buffer. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-wchar_t.h"
> +#include "Xprintf_buffer_done.c"
> diff --git a/stdio-common/wprintf_buffer_flush.c b/stdio-common/wprintf_buffer_flush.c
> new file mode 100644
> index 0000000000..2d91095cca
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_flush.c
> @@ -0,0 +1,36 @@
> +/* Flush a struct __wprintf_buffer. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +
> +#include "printf_buffer-wchar_t.h"
> +#include "Xprintf_buffer_flush.c"
> +
> +static void
> +__wprintf_buffer_do_flush (struct __wprintf_buffer *buf)
> +{
> + switch (buf->mode)
> + {
> + case __wprintf_buffer_mode_failed:
> + return;
> + case __wprintf_buffer_mode_to_file:
> + __wprintf_buffer_flush_to_file ((struct __wprintf_buffer_to_file *) buf);
> + return;
> + }
> + __builtin_trap ();
> +}
> diff --git a/stdio-common/wprintf_buffer_pad_1.c b/stdio-common/wprintf_buffer_pad_1.c
> new file mode 100644
> index 0000000000..9c91126f42
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_pad_1.c
> @@ -0,0 +1,21 @@
> +/* Write repeated characters to struct __wprintf_buffer. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-wchar_t.h"
> +#include "Xprintf_buffer_pad_1.c"
> diff --git a/stdio-common/wprintf_buffer_putc_1.c b/stdio-common/wprintf_buffer_putc_1.c
> new file mode 100644
> index 0000000000..b1af68e721
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_putc_1.c
> @@ -0,0 +1,21 @@
> +/* Overflow character write function for struct __wprintf_buffer. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-wchar_t.h"
> +#include "Xprintf_buffer_putc_1.c"
> diff --git a/stdio-common/wprintf_buffer_puts_1.c b/stdio-common/wprintf_buffer_puts_1.c
> new file mode 100644
> index 0000000000..039aebb56e
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_puts_1.c
> @@ -0,0 +1,21 @@
> +/* String write function struct __wprintf_buffer. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-wchar_t.h"
> +#include "Xprintf_buffer_puts_1.c"
> diff --git a/stdio-common/wprintf_buffer_to_file.c b/stdio-common/wprintf_buffer_to_file.c
> new file mode 100644
> index 0000000000..ac936fab6c
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_to_file.c
> @@ -0,0 +1,55 @@
> +/* Wide printf buffers writing data to a FILE *.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +/* This implementation is not optimized (unlikely the multibyte
> + implementation) and always writes to the temporary buffer first. */
> +
> +#include <printf_buffer_to_file.h>
> +
> +#include <array_length.h>
> +#include <libio/libioP.h>
> +
> +void
> +__wprintf_buffer_flush_to_file (struct __wprintf_buffer_to_file *buf)
> +{
> + size_t count = buf->base.write_ptr - buf->stage;
> + if ((size_t) _IO_sputn (buf->fp, buf->stage, count) != count)
> + {
> + __wprintf_buffer_mark_failed (&buf->base);
> + return;
> + }
> + buf->base.written += count;
> + buf->base.write_ptr = buf->stage;
> +}
> +
> +void
> +__wprintf_buffer_to_file_init (struct __wprintf_buffer_to_file *buf, FILE *fp)
> +{
> + __wprintf_buffer_init (&buf->base, buf->stage, array_length (buf->stage),
> + __wprintf_buffer_mode_to_file);
> + buf->fp = fp;
> +}
> +
> +int
> +__wprintf_buffer_to_file_done (struct __wprintf_buffer_to_file *buf)
> +{
> + if (__wprintf_buffer_has_failed (&buf->base))
> + return -1;
> + __wprintf_buffer_flush_to_file (buf);
> + return __wprintf_buffer_done (&buf->base);
> +}
> diff --git a/stdio-common/wprintf_buffer_write.c b/stdio-common/wprintf_buffer_write.c
> new file mode 100644
> index 0000000000..06b53c74c3
> --- /dev/null
> +++ b/stdio-common/wprintf_buffer_write.c
> @@ -0,0 +1,21 @@
> +/* Blob write function for struct __wprintf_buffer. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf_buffer.h>
> +#include "printf_buffer-wchar_t.h"
> +#include "Xprintf_buffer_write.c"
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 17:16 ` Adhemerval Zanella
@ 2022-06-02 17:58 ` Florian Weimer
2022-06-02 18:35 ` Adhemerval Zanella
` (2 more replies)
0 siblings, 3 replies; 36+ messages in thread
From: Florian Weimer @ 2022-06-02 17:58 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
* Adhemerval Zanella:
> Some comments below. I am not very found on this approach, it is *another*
> layer on our already convoluted libio/stdio code; although I don't have a
> better solution. I *really* wish we could move away from libio...
On the plus side, it completely eliminates libio for sprintf, strfromd,
strfmon.
>> +/* <printf_buffer_as_file.h> introduces a way to use struct
>> + __printf_buffer objects from FILE * streams. To avoid storing a
>> + function pointer (or vtable pointer) in struct __printf_buffer
>> + (which would defeat libio vtable hardening), a switch statement
>> + over the different flush implementations is used to implement
>> + __printf_buffer_flush.
>> +
>> + __printf_buffer_mode_failed is special: it is the sticky failure
>> + indicator. Unlike struct alloc_buffer, this is not folded into
>> + write_ptr, so that snprintf and other string-writing functions can
>> + discover the end of the string even in the error case, to be able
>> + to add the null terminator. */
>> +enum __printf_buffer_mode
>> + {
>> + __printf_buffer_mode_failed,
>> + __printf_buffer_mode_to_file,
>> + };
>
> Do we really need to use namespace safe names for types as well? I usually
> think it is usually clear to use otherwise.
It's needed to enable the type-generic implementations.
stdio-common/Xprintf_buffer_flush.c uses Xprintf (buffer_mode_failed).
I used to have two macros (Xprintf and __Xprintf), but I moved away from
this because using __printf_ everywhere seemed more consistent.
>> +/* Marks the buffer as failed, so that __printf_buffer_has_failed
>> + returns true and future flush operations are no-ops. */
>> +static inline void
>> +__printf_buffer_mark_failed (struct __printf_buffer *buf)
>
> For other internal interfaces it seems that current pratice is to use
> non double underscore static inline function wrappers over the namespace
> safe symbols. Maybe we should use the same strategy here.
Same reason as above.
>
>> +/* Write COUNT bytes starting at S to BUF. S must not overlap with
>> + the internal buffer. */
>
> Maybe add a overlpa check on Xprintf_buffer_write.c ? Not sure if it is
> worth though.
We actually can't because for sprintf, the target buffer (as specified)
extends to the end of the address space, it's unbounded.
>> +int
>> +Xprintf_buffer_done (struct Xprintf_buffer *buf)
>> +{
>> + if (Xprintf_buffer_has_failed (buf))
>> + return -1;
>> +
>> + /* Use uintptr_t to deal with ptrdiff_t overflows (to some degree). */
>
> I am not sure using uintptr_t yield any gain in fact, if
> 'buf->write_ptr - buf->write_base' can not fit in ptrdiff_t it means the
> code already trigger UB in write_ptr update.
I should probably remove that.
>> + uintptr_t written_current = buf->write_ptr - buf->write_base;
>> + unsigned int written_total;
>> + if (__builtin_add_overflow (buf->written, written_current, &written_total)
>
> I think it should use INT_ADD_OVERFLOW since we still support GCC 6.5 and
> __builtin_{add,sub}_overflow is not reliable with GCC 6.X [1].
>
> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98269
We require GCC 7.1 on s390x, see 844b4d8b4b937fe6943d2c0c80ce7d871cdb1eb5.
I'm not sure if INT_ADD_OVERFLOW deals correctly with mixed types.
>> +void
>> +Xprintf (buffer_puts_1) (struct Xprintf_buffer *buf, const CHAR_T *s)
>> +{
>> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
>> + return;
>> +
>> + while (*s != 0)
>> + {
>> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
>> + return;
>> + assert (buf->write_ptr != buf->write_end);
>> + size_t to_copy = STRNLEN (s, buf->write_end - buf->write_ptr);
>> + buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
>> + s += to_copy;
>> + }
>> +}
>
> Does it really need a loop here?
Yes, we might reach the end of the buffer with data left to write, so we
have to flush it. This can happen with asprintf and of course in the
FILE * case.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 17:58 ` Florian Weimer
@ 2022-06-02 18:35 ` Adhemerval Zanella
2022-06-02 18:41 ` Florian Weimer
2022-06-07 14:30 ` Florian Weimer
2022-06-07 16:55 ` Paul Eggert
2 siblings, 1 reply; 36+ messages in thread
From: Adhemerval Zanella @ 2022-06-02 18:35 UTC (permalink / raw)
To: Florian Weimer; +Cc: libc-alpha
On 02/06/2022 14:58, Florian Weimer wrote:
> * Adhemerval Zanella:
>
>> Some comments below. I am not very found on this approach, it is *another*
>> layer on our already convoluted libio/stdio code; although I don't have a
>> better solution. I *really* wish we could move away from libio...
>
> On the plus side, it completely eliminates libio for sprintf, strfromd,
> strfmon.
>
>>> +/* <printf_buffer_as_file.h> introduces a way to use struct
>>> + __printf_buffer objects from FILE * streams. To avoid storing a
>>> + function pointer (or vtable pointer) in struct __printf_buffer
>>> + (which would defeat libio vtable hardening), a switch statement
>>> + over the different flush implementations is used to implement
>>> + __printf_buffer_flush.
>>> +
>>> + __printf_buffer_mode_failed is special: it is the sticky failure
>>> + indicator. Unlike struct alloc_buffer, this is not folded into
>>> + write_ptr, so that snprintf and other string-writing functions can
>>> + discover the end of the string even in the error case, to be able
>>> + to add the null terminator. */
>>> +enum __printf_buffer_mode
>>> + {
>>> + __printf_buffer_mode_failed,
>>> + __printf_buffer_mode_to_file,
>>> + };
>>
>> Do we really need to use namespace safe names for types as well? I usually
>> think it is usually clear to use otherwise.
>
> It's needed to enable the type-generic implementations.
> stdio-common/Xprintf_buffer_flush.c uses Xprintf (buffer_mode_failed).
> I used to have two macros (Xprintf and __Xprintf), but I moved away from
> this because using __printf_ everywhere seemed more consistent.
Ok.
>
>>> +/* Marks the buffer as failed, so that __printf_buffer_has_failed
>>> + returns true and future flush operations are no-ops. */
>>> +static inline void
>>> +__printf_buffer_mark_failed (struct __printf_buffer *buf)
>>
>> For other internal interfaces it seems that current pratice is to use
>> non double underscore static inline function wrappers over the namespace
>> safe symbols. Maybe we should use the same strategy here.
>
> Same reason as above.
>>
>>> +/* Write COUNT bytes starting at S to BUF. S must not overlap with
>>> + the internal buffer. */
>>
>> Maybe add a overlpa check on Xprintf_buffer_write.c ? Not sure if it is
>> worth though.
>
> We actually can't because for sprintf, the target buffer (as specified)
> extends to the end of the address space, it's unbounded.
>
>>> +int
>>> +Xprintf_buffer_done (struct Xprintf_buffer *buf)
>>> +{
>>> + if (Xprintf_buffer_has_failed (buf))
>>> + return -1;
>>> +
>>> + /* Use uintptr_t to deal with ptrdiff_t overflows (to some degree). */
>>
>> I am not sure using uintptr_t yield any gain in fact, if
>> 'buf->write_ptr - buf->write_base' can not fit in ptrdiff_t it means the
>> code already trigger UB in write_ptr update.
>
> I should probably remove that.
>
>>> + uintptr_t written_current = buf->write_ptr - buf->write_base;
>>> + unsigned int written_total;
>>> + if (__builtin_add_overflow (buf->written, written_current, &written_total)
>>
>> I think it should use INT_ADD_OVERFLOW since we still support GCC 6.5 and
>> __builtin_{add,sub}_overflow is not reliable with GCC 6.X [1].
>>
>> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98269
>
> We require GCC 7.1 on s390x, see 844b4d8b4b937fe6943d2c0c80ce7d871cdb1eb5.
>
> I'm not sure if INT_ADD_OVERFLOW deals correctly with mixed types.
I think it does have some drawbacks for some usages. As a side note, I wonder
if should just create another header with just what we use from intprops.h
(TYPE_MINIMUM, TYPE_MAXIMUM, INT_BUFSIZE_BOUND) so we don't need to keep with
extra unused overflow/wraps macros. And it is one *less* thing we need to
keep in sync with gnulib.
>
>>> +void
>>> +Xprintf (buffer_puts_1) (struct Xprintf_buffer *buf, const CHAR_T *s)
>>> +{
>>> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
>>> + return;
>>> +
>>> + while (*s != 0)
>>> + {
>>> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
>>> + return;
>>> + assert (buf->write_ptr != buf->write_end);
>>> + size_t to_copy = STRNLEN (s, buf->write_end - buf->write_ptr);
>>> + buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
>>> + s += to_copy;
>>> + }
>>> +}
>>
>> Does it really need a loop here?
>
> Yes, we might reach the end of the buffer with data left to write, so we
> have to flush it. This can happen with asprintf and of course in the
> FILE * case.
>
But in this case case you will just return right? I am trying to understand
where the loop will be executed twice in this case.
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 18:35 ` Adhemerval Zanella
@ 2022-06-02 18:41 ` Florian Weimer
2022-06-02 18:55 ` Adhemerval Zanella
0 siblings, 1 reply; 36+ messages in thread
From: Florian Weimer @ 2022-06-02 18:41 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
* Adhemerval Zanella:
>>>> +void
>>>> +Xprintf (buffer_puts_1) (struct Xprintf_buffer *buf, const CHAR_T *s)
>>>> +{
>>>> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
>>>> + return;
>>>> +
>>>> + while (*s != 0)
>>>> + {
>>>> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
>>>> + return;
>>>> + assert (buf->write_ptr != buf->write_end);
>>>> + size_t to_copy = STRNLEN (s, buf->write_end - buf->write_ptr);
>>>> + buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
>>>> + s += to_copy;
>>>> + }
>>>> +}
>>>
>>> Does it really need a loop here?
>>
>> Yes, we might reach the end of the buffer with data left to write, so we
>> have to flush it. This can happen with asprintf and of course in the
>> FILE * case.
>>
>
> But in this case case you will just return right? I am trying to understand
> where the loop will be executed twice in this case.
No, the return happens only if we need to flush (==, no room in the
buffer) and the flush fails, e.g. due to a write system call failure, or
maybe because we have reached the end of the buffer for snprintf.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-05-23 14:07 ` [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf Florian Weimer
2022-06-02 17:16 ` Adhemerval Zanella
@ 2022-06-02 18:48 ` Adhemerval Zanella
2022-06-02 18:54 ` Florian Weimer
2022-06-07 16:57 ` Paul Eggert
2 siblings, 1 reply; 36+ messages in thread
From: Adhemerval Zanella @ 2022-06-02 18:48 UTC (permalink / raw)
To: Florian Weimer, libc-alpha
On 23/05/2022 11:07, Florian Weimer via Libc-alpha wrote:
> +
> +void
> +__printf_buffer_flush_to_file (struct __printf_buffer_to_file *buf)
> +{
> + /* The bytes in the buffer are always consumed. */
> + buf->base.written += buf->base.write_ptr - buf->base.write_base;
> +
> + if (buf->base.write_end == array_end (buf->stage))
> + {
> + /* If the stage buffer is used, make a copy into the file. The
> + stage buffer is always consumed fully, even if just partially
> + written, to ensure that the file stream has all the data. */
> + size_t count = buf->base.write_ptr - buf->stage;
> + if ((size_t) _IO_sputn (buf->fp, buf->stage, count) != count)
> + {
> + __printf_buffer_mark_failed (&buf->base);
> + return;
> + }
Indentation seems off here.
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 18:48 ` Adhemerval Zanella
@ 2022-06-02 18:54 ` Florian Weimer
0 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-06-02 18:54 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
* Adhemerval Zanella:
> On 23/05/2022 11:07, Florian Weimer via Libc-alpha wrote:
>> +
>> +void
>> +__printf_buffer_flush_to_file (struct __printf_buffer_to_file *buf)
>> +{
>> + /* The bytes in the buffer are always consumed. */
>> + buf->base.written += buf->base.write_ptr - buf->base.write_base;
>> +
>> + if (buf->base.write_end == array_end (buf->stage))
>> + {
>> + /* If the stage buffer is used, make a copy into the file. The
>> + stage buffer is always consumed fully, even if just partially
>> + written, to ensure that the file stream has all the data. */
>> + size_t count = buf->base.write_ptr - buf->stage;
>> + if ((size_t) _IO_sputn (buf->fp, buf->stage, count) != count)
>> + {
>> + __printf_buffer_mark_failed (&buf->base);
>> + return;
>> + }
>
> Indentation seems off here.
Right, fixed locally.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 18:41 ` Florian Weimer
@ 2022-06-02 18:55 ` Adhemerval Zanella
2022-06-02 19:12 ` Florian Weimer
0 siblings, 1 reply; 36+ messages in thread
From: Adhemerval Zanella @ 2022-06-02 18:55 UTC (permalink / raw)
To: Florian Weimer; +Cc: libc-alpha
On 02/06/2022 15:41, Florian Weimer wrote:
> * Adhemerval Zanella:
>
>>>>> +void
>>>>> +Xprintf (buffer_puts_1) (struct Xprintf_buffer *buf, const CHAR_T *s)
>>>>> +{
>>>>> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
>>>>> + return;
>>>>> +
>>>>> + while (*s != 0)
>>>>> + {
>>>>> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
>>>>> + return;
>>>>> + assert (buf->write_ptr != buf->write_end);
>>>>> + size_t to_copy = STRNLEN (s, buf->write_end - buf->write_ptr);
>>>>> + buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
>>>>> + s += to_copy;
>>>>> + }
>>>>> +}
>>>>
>>>> Does it really need a loop here?
>>>
>>> Yes, we might reach the end of the buffer with data left to write, so we
>>> have to flush it. This can happen with asprintf and of course in the
>>> FILE * case.
>>>
>>
>> But in this case case you will just return right? I am trying to understand
>> where the loop will be executed twice in this case.
>
> No, the return happens only if we need to flush (==, no room in the
> buffer) and the flush fails, e.g. due to a write system call failure, or
> maybe because we have reached the end of the buffer for snprintf.
>
Sigh, I forgot about the stage buffer you keep for printf_buffer_to_file.
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 18:55 ` Adhemerval Zanella
@ 2022-06-02 19:12 ` Florian Weimer
0 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-06-02 19:12 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
* Adhemerval Zanella:
> On 02/06/2022 15:41, Florian Weimer wrote:
>> * Adhemerval Zanella:
>>
>>>>>> +void
>>>>>> +Xprintf (buffer_puts_1) (struct Xprintf_buffer *buf, const CHAR_T *s)
>>>>>> +{
>>>>>> + if (__glibc_unlikely (Xprintf_buffer_has_failed (buf)))
>>>>>> + return;
>>>>>> +
>>>>>> + while (*s != 0)
>>>>>> + {
>>>>>> + if (buf->write_ptr == buf->write_end && !Xprintf_buffer_flush (buf))
>>>>>> + return;
>>>>>> + assert (buf->write_ptr != buf->write_end);
>>>>>> + size_t to_copy = STRNLEN (s, buf->write_end - buf->write_ptr);
>>>>>> + buf->write_ptr = MEMPCPY (buf->write_ptr, s, to_copy);
>>>>>> + s += to_copy;
>>>>>> + }
>>>>>> +}
>>>>>
>>>>> Does it really need a loop here?
>>>>
>>>> Yes, we might reach the end of the buffer with data left to write, so we
>>>> have to flush it. This can happen with asprintf and of course in the
>>>> FILE * case.
>>>>
>>>
>>> But in this case case you will just return right? I am trying to understand
>>> where the loop will be executed twice in this case.
>>
>> No, the return happens only if we need to flush (==, no room in the
>> buffer) and the flush fails, e.g. due to a write system call failure, or
>> maybe because we have reached the end of the buffer for snprintf.
>>
>
> Sigh, I forgot about the stage buffer you keep for printf_buffer_to_file.
This buffer is also used for asprintf, obstack_printf, dprintf. It's
not just the FILE * interfaces that can produce arbitrary-sized output.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 06/14] stdio-common: Add __printf_function_invoke
2022-05-23 14:07 ` [PATCH v2 06/14] stdio-common: Add __printf_function_invoke Florian Weimer
@ 2022-06-03 13:51 ` Adhemerval Zanella
0 siblings, 0 replies; 36+ messages in thread
From: Adhemerval Zanella @ 2022-06-03 13:51 UTC (permalink / raw)
To: Florian Weimer, libc-alpha
On 23/05/2022 11:07, Florian Weimer via Libc-alpha wrote:
> And __wprintf_function_invoke. These functions will be used to
> to call registered printf specifier callbacks on printf buffers
> after vfprintf and vfwprintf have been converted to buffers.
> ---
> include/printf.h | 10 ++++++
> stdio-common/Makefile | 2 ++
> stdio-common/Xprintf_function_invoke.c | 42 ++++++++++++++++++++++++++
> stdio-common/printf_function_invoke.c | 22 ++++++++++++++
> stdio-common/wprintf_function_invoke.c | 22 ++++++++++++++
> 5 files changed, 98 insertions(+)
> create mode 100644 stdio-common/Xprintf_function_invoke.c
> create mode 100644 stdio-common/printf_function_invoke.c
> create mode 100644 stdio-common/wprintf_function_invoke.c
>
> diff --git a/include/printf.h b/include/printf.h
> index 78accaab6d..8f064149d3 100644
> --- a/include/printf.h
> +++ b/include/printf.h
> @@ -41,6 +41,16 @@ union printf_arg
> void *pa_user;
> };
>
> +/* Invoke a registered printf callback. Called from vfprintf and vfwprintf. */
> +int __printf_function_invoke (void *, printf_function callback,
> + union printf_arg *args_value,
> + size_t ndata_args,
> + struct printf_info *info) attribute_hidden;
> +int __wprintf_function_invoke (void *, printf_function callback,
> + union printf_arg *args_value,
> + size_t ndata_args,
> + struct printf_info *info) attribute_hidden;
> +
> #include <bits/types/locale_t.h>
>
> /* Now define the internal interfaces. */
> diff --git a/stdio-common/Makefile b/stdio-common/Makefile
> index 5ba381fe41..9195b209cd 100644
> --- a/stdio-common/Makefile
> +++ b/stdio-common/Makefile
> @@ -63,6 +63,7 @@ routines := \
> printf_buffer_write \
> printf_fp \
> printf_fphex \
> + printf_function_invoke \
> printf_size \
> psiginfo \
> psignal \
> @@ -101,6 +102,7 @@ routines := \
> wprintf_buffer_puts_1 \
> wprintf_buffer_to_file \
> wprintf_buffer_write \
> + wprintf_function_invoke \
> # routines
>
> aux := \
> diff --git a/stdio-common/Xprintf_function_invoke.c b/stdio-common/Xprintf_function_invoke.c
> new file mode 100644
> index 0000000000..f631469ba9
> --- /dev/null
> +++ b/stdio-common/Xprintf_function_invoke.c
> @@ -0,0 +1,42 @@
> +/* Invoke a printf specifier handler. Generic version.
> + Copyright (C) 1991-2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +int
> +Xprintf (function_invoke) (void *buf,
> + printf_function callback,
> + union printf_arg *args_value,
> + size_t ndata_args,
> + struct printf_info *info)
> +{
> + const void *args[ndata_args];
> + for (unsigned int i = 0; i < ndata_args; ++i)
> + args[i] = &args_value[i];
Do we really a VLA here? My understanding is we are trying to move away to
alloca/VLA within glibc in favor to fixed size stack data structures (such
as scratch_buffer and dynarray).
> +
> + struct Xprintf (buffer_as_file) s;
> + Xprintf (buffer_as_file_init) (&s, buf);
> +
> + /* Call the function. */
> + int done = callback (Xprintf (buffer_as_file_get) (&s), info, args);
> +
> + if (!Xprintf (buffer_as_file_terminate) (&s))
> + /* Low-level error. */
> + return -1;
> +
> + /* Potential error from the callback function. */
> + return done;
> +}
> diff --git a/stdio-common/printf_function_invoke.c b/stdio-common/printf_function_invoke.c
> new file mode 100644
> index 0000000000..8919b892ca
> --- /dev/null
> +++ b/stdio-common/printf_function_invoke.c
> @@ -0,0 +1,22 @@
> +/* Invoke a printf specifier handler. Multibyte version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf.h>
> +#include <printf_buffer_as_file.h>
> +#include "printf_buffer-char.h"
> +#include "Xprintf_function_invoke.c"
> diff --git a/stdio-common/wprintf_function_invoke.c b/stdio-common/wprintf_function_invoke.c
> new file mode 100644
> index 0000000000..29a6b4e073
> --- /dev/null
> +++ b/stdio-common/wprintf_function_invoke.c
> @@ -0,0 +1,22 @@
> +/* Invoke a printf specifier handler. Wide version.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <printf.h>
> +#include <printf_buffer_as_file.h>
> +#include "printf_buffer-wchar_t.h"
> +#include "Xprintf_function_invoke.c"
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 17:58 ` Florian Weimer
2022-06-02 18:35 ` Adhemerval Zanella
@ 2022-06-07 14:30 ` Florian Weimer
2022-06-07 16:55 ` Paul Eggert
2 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-06-07 14:30 UTC (permalink / raw)
To: Florian Weimer via Libc-alpha
* Florian Weimer via Libc-alpha:
>> I am not sure using uintptr_t yield any gain in fact, if
>> 'buf->write_ptr - buf->write_base' can not fit in ptrdiff_t it means the
>> code already trigger UB in write_ptr update.
>
> I should probably remove that.
I'm instead going with this
/* Use uintptr_t here because for sprintf, the buffer range may
cover more than half of the address space+. */
uintptr_t written_current = buf->write_ptr - buf->write_base;
>>> + uintptr_t written_current = buf->write_ptr - buf->write_base;
>>> + unsigned int written_total;
>>> + if (__builtin_add_overflow (buf->written, written_current, &written_total)
>>
>> I think it should use INT_ADD_OVERFLOW since we still support GCC 6.5 and
>> __builtin_{add,sub}_overflow is not reliable with GCC 6.X [1].
>>
>> [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98269
>
> We require GCC 7.1 on s390x, see 844b4d8b4b937fe6943d2c0c80ce7d871cdb1eb5.
>
> I'm not sure if INT_ADD_OVERFLOW deals correctly with mixed types.
I'll keep __builtin_add_overflow.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-02 17:58 ` Florian Weimer
2022-06-02 18:35 ` Adhemerval Zanella
2022-06-07 14:30 ` Florian Weimer
@ 2022-06-07 16:55 ` Paul Eggert
2022-06-07 17:11 ` Florian Weimer
2 siblings, 1 reply; 36+ messages in thread
From: Paul Eggert @ 2022-06-07 16:55 UTC (permalink / raw)
To: Florian Weimer, Adhemerval Zanella; +Cc: libc-alpha
On 6/2/22 10:58, Florian Weimer via Libc-alpha wrote:
> I'm not sure if INT_ADD_OVERFLOW deals correctly with mixed types.
It works with any integer types - though as (I think) Florian mentioned,
if you can assume GCC 7 you can just use __builtin_add_overflow.
By the way if you want to use __builtin_mul_overflow you'll need at
least GCC 8.4+, 9.3+ or 10+, due to GCC bug 91450. intprops.h's
INT_MULTIPLY_WRAPV works around that bug and (like INT_ADD_WRAPV) deals
with any combination of integer types.
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-05-23 14:07 ` [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf Florian Weimer
2022-06-02 17:16 ` Adhemerval Zanella
2022-06-02 18:48 ` Adhemerval Zanella
@ 2022-06-07 16:57 ` Paul Eggert
2022-06-07 17:33 ` Florian Weimer
2 siblings, 1 reply; 36+ messages in thread
From: Paul Eggert @ 2022-06-07 16:57 UTC (permalink / raw)
To: Florian Weimer; +Cc: libc-alpha
On 5/23/22 07:07, Florian Weimer via Libc-alpha wrote:
> + /* Use uintptr_t to deal with ptrdiff_t overflows (to some degree). */
> + uintptr_t written_current = buf->write_ptr - buf->write_base;
> + unsigned int written_total;
> + if (__builtin_add_overflow (buf->written, written_current, &written_total)
> + || buf->written > INT_MAX)
> + {
Simpler is to declare written_total to be of type 'int'. Then
__builtin_add_overflow will do the right thing, with no need to compare
against INT_MAX.
buf->write_ptr - buf->write_base is of type ptrdiff_t and should never
be negative, so I don't see why it should be converted to an unsigned
type. glibc shouldn't allocate objects larger than PTRDIFF_MAX. Any
attempt by a user to create or use a buffer larger than that should be
rejected anyway (too many opportunities for user error or glibc internal
error).
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-07 16:55 ` Paul Eggert
@ 2022-06-07 17:11 ` Florian Weimer
2022-06-07 17:41 ` Paul Eggert
0 siblings, 1 reply; 36+ messages in thread
From: Florian Weimer @ 2022-06-07 17:11 UTC (permalink / raw)
To: Paul Eggert; +Cc: Adhemerval Zanella, libc-alpha
* Paul Eggert:
> On 6/2/22 10:58, Florian Weimer via Libc-alpha wrote:
>> I'm not sure if INT_ADD_OVERFLOW deals correctly with mixed types.
(That should be INT_ADD_WRAPV because INT_ADD_OVERFLOW does not know
about the result type.)
> It works with any integer types
Is this actually true? I don't see how exactly things are layered, but
there is this requirement for INT_ADD_RANGE_OVERFLOW:
| The arithmetic arguments (including the MIN and MAX arguments) must be
| of the same integer type after the usual arithmetic conversions, and
| the type must have minimum value MIN and maximum MAX.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-07 16:57 ` Paul Eggert
@ 2022-06-07 17:33 ` Florian Weimer
0 siblings, 0 replies; 36+ messages in thread
From: Florian Weimer @ 2022-06-07 17:33 UTC (permalink / raw)
To: Paul Eggert; +Cc: libc-alpha
* Paul Eggert:
> On 5/23/22 07:07, Florian Weimer via Libc-alpha wrote:
>> + /* Use uintptr_t to deal with ptrdiff_t overflows (to some degree). */
>> + uintptr_t written_current = buf->write_ptr - buf->write_base;
>> + unsigned int written_total;
>> + if (__builtin_add_overflow (buf->written, written_current, &written_total)
>> + || buf->written > INT_MAX)
>> + {
>
> Simpler is to declare written_total to be of type 'int'. Then
> __builtin_add_overflow will do the right thing, with no need to
> compare against INT_MAX.
Right, I'm going tom make the change and re-test.
> buf->write_ptr - buf->write_base is of type ptrdiff_t and should never
> be negative, so I don't see why it should be converted to an unsigned
> type. glibc shouldn't allocate objects larger than PTRDIFF_MAX. Any
> attempt by a user to create or use a buffer larger than that should be
> rejected anyway (too many opportunities for user error or glibc
> internal error).
I think that's not how the specified maximum size for __sprintf_chk
works. It can be so large that there is address space wraparound.
Thanks,
Florian
^ permalink raw reply [flat|nested] 36+ messages in thread
* Re: [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf
2022-06-07 17:11 ` Florian Weimer
@ 2022-06-07 17:41 ` Paul Eggert
0 siblings, 0 replies; 36+ messages in thread
From: Paul Eggert @ 2022-06-07 17:41 UTC (permalink / raw)
To: Florian Weimer; +Cc: Adhemerval Zanella, libc-alpha
On 6/7/22 10:11, Florian Weimer wrote:
> Is this actually true? I don't see how exactly things are layered, but
> there is this requirement for INT_ADD_RANGE_OVERFLOW:
Yes, it's true.
INT_ADD_RANGE_OVERFLOW has more restrictions, I don't recommend it for
casual use, and INT_ADD_WRAPV doesn't use INT_ADD_RANGE_OVERFLOW. With
older compilers INT_ADD_WRAPV uses _GL_INT_ADD_RANGE_OVERFLOW and does
so safely.
Please use INT_ADD_WRAPV instead; it works like __builtin_add_overflow
regardless of GCC version (and works for non-GCC too, but glibc doesn't
care about that).
^ permalink raw reply [flat|nested] 36+ messages in thread
end of thread, other threads:[~2022-06-07 17:41 UTC | newest]
Thread overview: 36+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-05-23 14:06 [PATCH v2 00/14] vfprintf rework to remove vtables Florian Weimer
2022-05-23 14:07 ` [PATCH v2 01/14] stdio-common: Add printf specifier registry to <printf.h> Florian Weimer
2022-05-23 14:37 ` Andreas Schwab
2022-05-23 14:07 ` [PATCH v2 02/14] stdio-common: Move union printf_arg int <printf.h> Florian Weimer
2022-05-23 14:07 ` [PATCH v2 03/14] stdio-common: Simplify printf_unknown interface in vfprintf-internal.c Florian Weimer
2022-05-23 14:07 ` [PATCH v2 04/14] locale: Implement struct grouping_iterator Florian Weimer
2022-05-23 20:00 ` Adhemerval Zanella
2022-05-24 13:31 ` Andreas Schwab
2022-05-24 14:33 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 05/14] stdio-common: Introduce buffers for implementing printf Florian Weimer
2022-06-02 17:16 ` Adhemerval Zanella
2022-06-02 17:58 ` Florian Weimer
2022-06-02 18:35 ` Adhemerval Zanella
2022-06-02 18:41 ` Florian Weimer
2022-06-02 18:55 ` Adhemerval Zanella
2022-06-02 19:12 ` Florian Weimer
2022-06-07 14:30 ` Florian Weimer
2022-06-07 16:55 ` Paul Eggert
2022-06-07 17:11 ` Florian Weimer
2022-06-07 17:41 ` Paul Eggert
2022-06-02 18:48 ` Adhemerval Zanella
2022-06-02 18:54 ` Florian Weimer
2022-06-07 16:57 ` Paul Eggert
2022-06-07 17:33 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 06/14] stdio-common: Add __printf_function_invoke Florian Weimer
2022-06-03 13:51 ` Adhemerval Zanella
2022-05-23 14:07 ` [PATCH v2 07/14] stdio-common: Add __translated_number_width Florian Weimer
2022-05-23 14:07 ` [PATCH v2 08/14] stdio-common: Convert vfprintf and related functions to buffers Florian Weimer
2022-05-23 20:23 ` Joseph Myers
2022-05-23 20:48 ` Florian Weimer
2022-05-23 14:07 ` [PATCH v2 09/14] stdio-common: Add lock optimization to vfprintf and vfwprintf Florian Weimer
2022-05-23 14:07 ` [PATCH v2 10/14] libio: Convert __vsprintf_internal to buffers Florian Weimer
2022-05-23 14:07 ` [PATCH v2 11/14] libio: Convert __vasprintf_internal " Florian Weimer
2022-05-23 14:08 ` [PATCH v2 12/14] libio: Convert __vdprintf_internal " Florian Weimer
2022-05-23 14:08 ` [PATCH v2 13/14] libio: Convert __obstack_vprintf_internal to buffers (bug 27124) Florian Weimer
2022-05-23 14:08 ` [PATCH v2 14/14] libio: Convert __vswprintf_internal to buffers (bug 27857) Florian Weimer
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