mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-20 00:05:06 +02:00
![Derek Buitenhuis](/assets/img/avatar_default.png)
All versions of MinGW-w64 prior to version 3, as well as all versions of MinGW32 have broken implementations of vsnprintf. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/*
|
|
* C99-compatible snprintf() and vsnprintf() implementations
|
|
* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdarg.h>
|
|
#include <limits.h>
|
|
#include <string.h>
|
|
|
|
#include "compat/va_copy.h"
|
|
#include "libavutil/error.h"
|
|
|
|
#if defined(__MINGW32__)
|
|
#define EOVERFLOW EFBIG
|
|
#endif
|
|
|
|
int avpriv_snprintf(char *s, size_t n, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap, fmt);
|
|
ret = avpriv_vsnprintf(s, n, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int avpriv_vsnprintf(char *s, size_t n, const char *fmt,
|
|
va_list ap)
|
|
{
|
|
int ret;
|
|
va_list ap_copy;
|
|
|
|
if (n == 0)
|
|
return _vscprintf(fmt, ap);
|
|
else if (n > INT_MAX)
|
|
return AVERROR(EOVERFLOW);
|
|
|
|
/* we use n - 1 here because if the buffer is not big enough, the MS
|
|
* runtime libraries don't add a terminating zero at the end. MSDN
|
|
* recommends to provide _snprintf/_vsnprintf() a buffer size that
|
|
* is one less than the actual buffer, and zero it before calling
|
|
* _snprintf/_vsnprintf() to workaround this problem.
|
|
* See http://msdn.microsoft.com/en-us/library/1kt27hek(v=vs.80).aspx */
|
|
memset(s, 0, n);
|
|
va_copy(ap_copy, ap);
|
|
ret = _vsnprintf(s, n - 1, fmt, ap_copy);
|
|
va_end(ap_copy);
|
|
if (ret == -1)
|
|
ret = _vscprintf(fmt, ap);
|
|
|
|
return ret;
|
|
}
|