[glibc] stdio: Split __get_errname definition from errlist.c

[glibc] stdio: Split __get_errname definition from errlist.c

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=592b6d00aaaf435efd687e99b5985852dffb4c80

commit 592b6d00aaaf435efd687e99b5985852dffb4c80
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Apr 6 11:46:46 2022 -0300

    stdio: Split __get_errname definition from errlist.c
    
    The loader does not need to pull all __get_errlist definitions
    and its size is decreased:
    
    Before:
    $ size elf/ld.so
       text    data     bss     dec     hex filename
     197774   11024     456  209254   33166 elf/ld.so
    
    After:
    $ size elf/ld.so
       text    data     bss     dec     hex filename
     191510    9936     456  201902   314ae elf/ld.so
    
    Checked on x86_64-linux-gnu.

Diff:
---
 stdio-common/Makefile       |  1 +
 stdio-common/errlist.c      | 38 ++--------------------------
 stdio-common/errname.c      | 61 +++++++++++++++++++++++++++++++++++++++++++++
 sysdeps/mach/hurd/errname.c | 21 ++++++++++++++++
 4 files changed, 85 insertions(+), 36 deletions(-)

diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 435cd8904f..a1603e82fe 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -88,6 +88,7 @@ routines := \
 
 aux := \
   errlist \
+  errname \
   fxprintf \
   printf-parsemb \
   printf-parsewc \
diff --git a/stdio-common/errlist.c b/stdio-common/errlist.c
index 310b858e31..1c09a31a7a 100644
--- a/stdio-common/errlist.c
+++ b/stdio-common/errlist.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
+/* Internal errno names mapping definition.
+   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
@@ -40,39 +41,4 @@ __get_errlist (int errnum)
   return NULL;
 }
 
-static const union sys_errname_t
-{
-  struct
-  {
-#define MSGSTRFIELD1(line) str##line
-#define MSGSTRFIELD(line)  MSGSTRFIELD1(line)
-#define _S(n, str)         char MSGSTRFIELD(__LINE__)[sizeof(#n)];
-#include <errlist.h>
-#undef _S
-  };
-  char str[0];
-} _sys_errname = { {
-#define _S(n, s) #n,
-#include <errlist.h>
-#undef _S
-} };
-
-static const unsigned short _sys_errnameidx[] =
-{
-#define _S(n, s) \
-  [ERR_MAP(n)] = offsetof(union sys_errname_t, MSGSTRFIELD(__LINE__)),
-#include <errlist.h>
-#undef _S
-};
-
-const char *
-__get_errname (int errnum)
-{
-  int mapped = ERR_MAP (errnum);
-  if (mapped < 0 || mapped >= array_length (_sys_errnameidx)
-      || (mapped > 0 && _sys_errnameidx[mapped] == 0))
-    return NULL;
-  return _sys_errname.str + _sys_errnameidx[mapped];
-}
-
 #include <errlist-compat.c>
diff --git a/stdio-common/errname.c b/stdio-common/errname.c
new file mode 100644
index 0000000000..08e4cecbd1
--- /dev/null
+++ b/stdio-common/errname.c
@@ -0,0 +1,61 @@
+/* Internal errno names mapping definition.
+   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 <stdio.h>
+#include <errno.h>
+#include <libintl.h>
+#include <array_length.h>
+
+#ifndef ERR_MAP
+# define ERR_MAP(n) n
+#endif
+
+static const union sys_errname_t
+{
+  struct
+  {
+#define MSGSTRFIELD1(line) str##line
+#define MSGSTRFIELD(line)  MSGSTRFIELD1(line)
+#define _S(n, str)         char MSGSTRFIELD(__LINE__)[sizeof(#n)];
+#include <errlist.h>
+#undef _S
+  };
+  char str[0];
+} _sys_errname = { {
+#define _S(n, s) #n,
+#include <errlist.h>
+#undef _S
+} };
+
+static const unsigned short _sys_errnameidx[] =
+{
+#define _S(n, s) \
+  [ERR_MAP(n)] = offsetof(union sys_errname_t, MSGSTRFIELD(__LINE__)),
+#include <errlist.h>
+#undef _S
+};
+
+const char *
+__get_errname (int errnum)
+{
+  int mapped = ERR_MAP (errnum);
+  if (mapped < 0 || mapped >= array_length (_sys_errnameidx)
+      || (mapped > 0 && _sys_errnameidx[mapped] == 0))
+    return NULL;
+  return _sys_errname.str + _sys_errnameidx[mapped];
+}
diff --git a/sysdeps/mach/hurd/errname.c b/sysdeps/mach/hurd/errname.c
new file mode 100644
index 0000000000..09ddb49478
--- /dev/null
+++ b/sysdeps/mach/hurd/errname.c
@@ -0,0 +1,21 @@
+/* Copyright (C) 1998-2022 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 <mach/error.h>
+
+#define ERR_MAP(value) err_get_code (value)
+#include <stdio-common/errname.c>