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error, warn, warnx: Use __fxprintf for wide printing [BZ #23519]

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Also introduce the __vfxprintf function.
This commit is contained in:
Florian Weimer 2018-08-14 13:36:10 +02:00
parent 599cf39766
commit fdb16de387
7 changed files with 129 additions and 145 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2018-08-14 Florian Weimer <fweimer@redhat.com>
[BZ #23519]
* include/stdio.h (__vfxprintf): Declare.
* stdio-common/fxprintf.c (__vfxprintf): New function.
(__fxprintf): Call it.
* misc/err.c (convert_and_print): Remove function.
(vwarnx, vwarn): Call __fxprintf and __vfxprintf.
* misc/error.c [_LIBC] (error_tail): Call __vfxprintf.
* misc/Makefile (tests): Add tst-warn-wide.
* misc/tst-warn-wide.c: New file.
2018-08-14 Wilco Dijkstra <wdijkstr@arm.com>
Szabolcs Nagy <szabolcs.nagy@arm.com>

2
include/stdio.h
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@ -126,6 +126,8 @@ extern int __fxprintf (FILE *__fp, const char *__fmt, ...)
__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
extern int __fxprintf_nocancel (FILE *__fp, const char *__fmt, ...)
__attribute__ ((__format__ (__printf__, 2, 3))) attribute_hidden;
int __vfxprintf (FILE *__fp, const char *__fmt, __gnuc_va_list)
attribute_hidden;
/* Read the next line from FP into BUFFER, of LENGTH bytes. LINE will
include the line terminator and a NUL terminator. On success,

2
misc/Makefile
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@ -84,7 +84,7 @@ tests := tst-dirname tst-tsearch tst-fdset tst-efgcvt tst-mntent tst-hsearch \
tst-error1 tst-pselect tst-insremque tst-mntent2 bug-hsearch1 \
tst-mntent-blank-corrupt tst-mntent-blank-passno bug18240 \
tst-preadvwritev tst-preadvwritev64 tst-makedev tst-empty \
tst-preadvwritev2 tst-preadvwritev64v2
tst-preadvwritev2 tst-preadvwritev64v2 tst-warn-wide
tests-internal := tst-atomic tst-atomic-long tst-allocate_once
tests-static := tst-empty

82
misc/err.c
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@ -37,68 +37,14 @@ extern char *__progname;
va_end (ap); \
}
static void
convert_and_print (const char *format, __gnuc_va_list ap)
{
#define ALLOCA_LIMIT 2000
size_t len;
wchar_t *wformat = NULL;
mbstate_t st;
size_t res;
const char *tmp;
if (format == NULL)
return;
len = strlen (format) + 1;
do
{
if (len < ALLOCA_LIMIT)
wformat = (wchar_t *) alloca (len * sizeof (wchar_t));
else
{
if (wformat != NULL && len / 2 < ALLOCA_LIMIT)
wformat = NULL;
wformat = (wchar_t *) realloc (wformat, len * sizeof (wchar_t));
if (wformat == NULL)
{
fputws_unlocked (L"out of memory\n", stderr);
return;
}
}
memset (&st, '\0', sizeof (st));
tmp =format;
}
while ((res = __mbsrtowcs (wformat, &tmp, len, &st)) == len);
if (res == (size_t) -1)
/* The string cannot be converted. */
wformat = (wchar_t *) L"???";
__vfwprintf (stderr, wformat, ap);
}
void
vwarnx (const char *format, __gnuc_va_list ap)
{
flockfile (stderr);
if (_IO_fwide (stderr, 0) > 0)
{
__fwprintf (stderr, L"%s: ", __progname);
convert_and_print (format, ap);
putwc_unlocked (L'\n', stderr);
}
else
{
fprintf (stderr, "%s: ", __progname);
if (format)
vfprintf (stderr, format, ap);
putc_unlocked ('\n', stderr);
}
__fxprintf (stderr, "%s: ", __progname);
if (format != NULL)
__vfxprintf (stderr, format, ap);
__fxprintf (stderr, "\n");
funlockfile (stderr);
}
libc_hidden_def (vwarnx)
@ -109,27 +55,17 @@ vwarn (const char *format, __gnuc_va_list ap)
int error = errno;
flockfile (stderr);
if (_IO_fwide (stderr, 0) > 0)
if (format != NULL)
{
__fwprintf (stderr, L"%s: ", __progname);
if (format)
{
convert_and_print (format, ap);
fputws_unlocked (L": ", stderr);
}
__fxprintf (stderr, "%s: ", __progname);
__vfxprintf (stderr, format, ap);
__set_errno (error);
__fwprintf (stderr, L"%m\n");
__fxprintf (stderr, ": %m\n");
}
else
{
fprintf (stderr, "%s: ", __progname);
if (format)
{
vfprintf (stderr, format, ap);
fputs_unlocked (": ", stderr);
}
__set_errno (error);
fprintf (stderr, "%m\n");
__fxprintf (stderr, "%s: %m\n", __progname);
}
funlockfile (stderr);
}

72
misc/error.c
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@ -203,72 +203,14 @@ static void _GL_ATTRIBUTE_FORMAT_PRINTF (3, 0) _GL_ARG_NONNULL ((3))
error_tail (int status, int errnum, const char *message, va_list args)
{
#if _LIBC
if (_IO_fwide (stderr, 0) > 0)
{
size_t len = strlen (message) + 1;
wchar_t *wmessage = NULL;
mbstate_t st;
size_t res;
const char *tmp;
bool use_malloc = false;
while (1)
{
if (__libc_use_alloca (len * sizeof (wchar_t)))
wmessage = (wchar_t *) alloca (len * sizeof (wchar_t));
else
{
if (!use_malloc)
wmessage = NULL;
wchar_t *p = (wchar_t *) realloc (wmessage,
len * sizeof (wchar_t));
if (p == NULL)
{
free (wmessage);
fputws_unlocked (L"out of memory\n", stderr);
return;
}
wmessage = p;
use_malloc = true;
}
memset (&st, '\0', sizeof (st));
tmp = message;
res = mbsrtowcs (wmessage, &tmp, len, &st);
if (res != len)
break;
if (__builtin_expect (len >= SIZE_MAX / sizeof (wchar_t) / 2, 0))
{
/* This really should not happen if everything is fine. */
res = (size_t) -1;
break;
}
len *= 2;
}
if (res == (size_t) -1)
{
/* The string cannot be converted. */
if (use_malloc)
{
free (wmessage);
use_malloc = false;
}
wmessage = (wchar_t *) L"???";
}
__vfwprintf (stderr, wmessage, args);
if (use_malloc)
free (wmessage);
}
else
int ret = __vfxprintf (stderr, message, args);
if (ret < 0 && errno == ENOMEM && _IO_fwide (stderr, 0) > 0)
/* Leave a trace in case the heap allocation of the message string
failed. */
fputws_unlocked (L"out of memory\n", stderr);
#else
vfprintf (stderr, message, args);
#endif
vfprintf (stderr, message, args);
va_end (args);
++error_message_count;

88
misc/tst-warn-wide.c Normal file
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@ -0,0 +1,88 @@
/* Test wide output conversion for warn.
Copyright (C) 2018 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
<http://www.gnu.org/licenses/>. */
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/xmemstream.h>
#include <wchar.h>
/* Used to trigger the large-string path in __fxprintf. */
#define PADDING \
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
#define LPADDING \
L"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
static void
one_test (const char *message, int error_code, const wchar_t *expected)
{
wchar_t *buffer = NULL;
size_t length = 0;
FILE *fp = open_wmemstream (&buffer, &length);
TEST_VERIFY_EXIT (fp != NULL);
FILE *old_stderr = stderr;
stderr = fp;
errno = error_code;
switch (error_code)
{
case E2BIG:
warn ("%s with padding " PADDING, message);
break;
case EAGAIN:
warn ("%s", message);
break;
case -1:
warnx ("%s", message);
break;
case -2:
warnx ("%s with padding " PADDING, message);
break;
}
stderr = old_stderr;
TEST_VERIFY_EXIT (!ferror (fp));
TEST_COMPARE (fclose (fp), 0);
if (wcscmp (buffer, expected) != 0)
FAIL_EXIT1 ("unexpected output: %ls", buffer);
free (buffer);
}
static int
do_test (void)
{
one_test ("no errno", -1,
L"tst-warn-wide: no errno\n");
one_test ("no errno", -2,
L"tst-warn-wide: no errno with padding " PADDING "\n");
one_test ("with errno", EAGAIN,
L"tst-warn-wide: with errno: Resource temporarily unavailable\n");
one_test ("with errno", E2BIG,
L"tst-warn-wide: with errno with padding " PADDING
": Argument list too long\n");
return 0;
}
#include <support/test-driver.c>

16
stdio-common/fxprintf.c
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@ -62,18 +62,22 @@ locked_vfxprintf (FILE *fp, const char *fmt, va_list ap)
}
int
__fxprintf (FILE *fp, const char *fmt, ...)
__vfxprintf (FILE *fp, const char *fmt, va_list ap)
{
if (fp == NULL)
fp = stderr;
_IO_flockfile (fp);
int res = locked_vfxprintf (fp, fmt, ap);
_IO_funlockfile (fp);
return res;
}
int
__fxprintf (FILE *fp, const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
_IO_flockfile (fp);
int res = locked_vfxprintf (fp, fmt, ap);
_IO_funlockfile (fp);
int res = __vfxprintf (fp, fmt, ap);
va_end (ap);
return res;
}