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  1. /*
  2.  * C99-compatible snprintf() and vsnprintf() implementations
  3.  * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include <stdio.h>
  23. #include <stdarg.h>
  24. #include <limits.h>
  25. #include <string.h>
  26.  
  27. #include "compat/va_copy.h"
  28. #include "libavutil/error.h"
  29.  
  30. #if defined(__MINGW32__)
  31. #define EOVERFLOW EFBIG
  32. #endif
  33.  
  34. int avpriv_snprintf(char *s, size_t n, const char *fmt, ...)
  35. {
  36.     va_list ap;
  37.     int ret;
  38.  
  39.     va_start(ap, fmt);
  40.     ret = avpriv_vsnprintf(s, n, fmt, ap);
  41.     va_end(ap);
  42.  
  43.     return ret;
  44. }
  45.  
  46. int avpriv_vsnprintf(char *s, size_t n, const char *fmt,
  47.                      va_list ap)
  48. {
  49.     int ret;
  50.     va_list ap_copy;
  51.  
  52.     if (n == 0)
  53.         return _vscprintf(fmt, ap);
  54.     else if (n > INT_MAX)
  55.         return AVERROR(EOVERFLOW);
  56.  
  57.     /* we use n - 1 here because if the buffer is not big enough, the MS
  58.      * runtime libraries don't add a terminating zero at the end. MSDN
  59.      * recommends to provide _snprintf/_vsnprintf() a buffer size that
  60.      * is one less than the actual buffer, and zero it before calling
  61.      * _snprintf/_vsnprintf() to workaround this problem.
  62.      * See http://msdn.microsoft.com/en-us/library/1kt27hek(v=vs.80).aspx */
  63.     memset(s, 0, n);
  64.     va_copy(ap_copy, ap);
  65.     ret = _vsnprintf(s, n - 1, fmt, ap_copy);
  66.     va_end(ap_copy);
  67.     if (ret == -1)
  68.         ret = _vscprintf(fmt, ap);
  69.  
  70.     return ret;
  71. }
  72.