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* [binutils-gdb] Make '{putchar, fputc}_unfiltered' use 'fputs_unfiltered'
@ 2020-02-20 21:02 Sergio Durigan Junior
0 siblings, 0 replies; only message in thread
From: Sergio Durigan Junior @ 2020-02-20 21:02 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=3f702acd7d562d3a33c59d6398ae74058438d2c7
commit 3f702acd7d562d3a33c59d6398ae74058438d2c7
Author: Sergio Durigan Junior <sergiodj@redhat.com>
Date: Wed Feb 19 16:40:48 2020 -0500
Make '{putchar,fputc}_unfiltered' use 'fputs_unfiltered'
There is currently a regression when using
'{putchar,fputc}_unfiltered' with 'puts_unfiltered' which was
introduced by one of the commits that reworked the unfiltered print
code.
The regression makes it impossible to use '{putchar,fputc}_unfiltered'
with 'puts_unfiltered', because the former writes directly to the
ui_file stream using 'stream->write', while the latter uses a buffered
mechanism (see 'wrap_buffer') and delays the printing.
If you do a quick & dirty hack on e.g. top.c:show_gdb_datadir:
@@ -2088,6 +2088,13 @@ static void
show_gdb_datadir (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
+ putchar_unfiltered ('\n');
+ puts_unfiltered ("TEST");
+ putchar_unfiltered ('>');
+ puts_unfiltered ("PUTS");
+ putchar_unfiltered ('\n');
rebuild GDB and invoke the "show data-directory" command, you will
see:
(gdb) show data-directory
>
TESTPUTSGDB's data directory is "/usr/local/share/gdb".
Note how the '>' was printed before the output, and "TEST" and "PUTS"
were printed together.
My first attempt to fix this was to always call 'flush_wrap_buffer' at
the end of 'fputs_maybe_filtered', since it seemed to me that the
function should always print what was requested. But I wasn't sure
this was the right thing to do, so I talked to Tom on IRC and he gave
me another, simpler idea: make '{putchar,fputc}_unfiltered' call into
the already existing 'fputs_unfiltered' function.
This patch implements the idea. I regtested it on the Buildbot, and
no regressions were detected.
gdb/ChangeLog:
2020-02-20 Sergio Durigan Junior <sergiodj@redhat.com>
Tom Tromey <tom@tromey.com>
* utils.c (fputs_maybe_filtered): Call 'stream->puts' instead
of 'fputc_unfiltered'.
(putchar_unfiltered): Call 'fputc_unfiltered'.
(fputc_unfiltered): Call 'fputs_unfiltered'.
Diff:
---
gdb/ChangeLog | 8 ++++++++
gdb/utils.c | 25 +++++++++++++++++--------
2 files changed, 25 insertions(+), 8 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 405eecf..40bee39 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,11 @@
+2020-02-20 Sergio Durigan Junior <sergiodj@redhat.com>
+ Tom Tromey <tom@tromey.com>
+
+ * utils.c (fputs_maybe_filtered): Call 'stream->puts' instead
+ of 'fputc_unfiltered'.
+ (putchar_unfiltered): Call 'fputc_unfiltered'.
+ (fputc_unfiltered): Call 'fputs_unfiltered'.
+
2020-02-20 Andrew Burgess <andrew.burgess@embecosm.com>
* config.in: Regenerate.
diff --git a/gdb/utils.c b/gdb/utils.c
index 0200a86..0b47012 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -1776,7 +1776,12 @@ fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
newline -- if chars_per_line is right, we
probably just overflowed anyway; if it's wrong,
let us keep going. */
- fputc_unfiltered ('\n', stream);
+ /* XXX: The ideal thing would be to call
+ 'stream->putc' here, but we can't because it
+ currently calls 'fputc_unfiltered', which ends up
+ calling us, which generates an infinite
+ recursion. */
+ stream->puts ("\n");
}
else
{
@@ -1821,7 +1826,12 @@ fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
wrap_here ((char *) 0); /* Spit out chars, cancel
further wraps. */
lines_printed++;
- fputc_unfiltered ('\n', stream);
+ /* XXX: The ideal thing would be to call
+ 'stream->putc' here, but we can't because it
+ currently calls 'fputc_unfiltered', which ends up
+ calling us, which generates an infinite
+ recursion. */
+ stream->puts ("\n");
lineptr++;
}
}
@@ -1916,10 +1926,7 @@ fputs_highlighted (const char *str, const compiled_regex &highlight,
int
putchar_unfiltered (int c)
{
- char buf = c;
-
- gdb_stdout->write (&buf, 1);
- return c;
+ return fputc_unfiltered (c, gdb_stdout);
}
/* Write character C to gdb_stdout using GDB's paging mechanism and return C.
@@ -1934,9 +1941,11 @@ putchar_filtered (int c)
int
fputc_unfiltered (int c, struct ui_file *stream)
{
- char buf = c;
+ char buf[2];
- stream->write (&buf, 1);
+ buf[0] = c;
+ buf[1] = 0;
+ fputs_unfiltered (buf, stream);
return c;
}
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2020-02-20 21:02 [binutils-gdb] Make '{putchar, fputc}_unfiltered' use 'fputs_unfiltered' Sergio Durigan Junior
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