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892e125f1c
Use a scratch_buffer rather than alloca/malloc to avoid potential stack overflow. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
/* Copyright (C) 2005-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <scratch_buffer.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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#include <libioP.h>
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static int
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locked_vfxprintf (FILE *fp, const char *fmt, va_list ap,
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unsigned int mode_flags)
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{
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if (_IO_fwide (fp, 0) <= 0)
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return __vfprintf_internal (fp, fmt, ap, mode_flags);
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/* We must convert the narrow format string to a wide one.
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Each byte can produce at most one wide character. */
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wchar_t *wfmt;
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mbstate_t mbstate;
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int res;
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size_t len = strlen (fmt) + 1;
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struct scratch_buffer buf;
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scratch_buffer_init (&buf);
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if (__glibc_unlikely (len > SIZE_MAX / sizeof (wchar_t)))
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{
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__set_errno (EOVERFLOW);
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return -1;
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}
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if (!scratch_buffer_set_array_size (&buf, sizeof (wchar_t), len))
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return -1;
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wfmt = buf.data;
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memset (&mbstate, 0, sizeof mbstate);
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res = __mbsrtowcs (wfmt, &fmt, len, &mbstate);
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if (res != -1)
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res = __vfwprintf_internal (fp, wfmt, ap, mode_flags);
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scratch_buffer_free (&buf);
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return res;
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}
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int
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__vfxprintf (FILE *fp, const char *fmt, va_list ap,
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unsigned int mode_flags)
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{
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if (fp == NULL)
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fp = stderr;
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_IO_flockfile (fp);
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int res = locked_vfxprintf (fp, fmt, ap, mode_flags);
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_IO_funlockfile (fp);
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return res;
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}
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int
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__fxprintf (FILE *fp, const char *fmt, ...)
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{
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va_list ap;
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va_start (ap, fmt);
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int res = __vfxprintf (fp, fmt, ap, 0);
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va_end (ap);
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return res;
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}
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int
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__fxprintf_nocancel (FILE *fp, const char *fmt, ...)
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{
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if (fp == NULL)
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fp = stderr;
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va_list ap;
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va_start (ap, fmt);
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_IO_flockfile (fp);
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int save_flags2 = fp->_flags2;
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fp->_flags2 |= _IO_FLAGS2_NOTCANCEL;
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int res = locked_vfxprintf (fp, fmt, ap, 0);
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fp->_flags2 = save_flags2;
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_IO_funlockfile (fp);
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va_end (ap);
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return res;
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}
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