libavutil/avstring.h

   1 /*
   2  * Copyright (c) 2007 Mans Rullgard
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef FFMPEG_AVSTRING_H
  22 #define FFMPEG_AVSTRING_H
  23
  24 #include <stddef.h>
  25
  26 /**
  27  * Return non-zero if pfx is a prefix of str. If it is, *ptr is set to
  28  * the address of the first character in str after the prefix.
  29  *
  30  * @param str input string
  31  * @param pfx prefix to test
  32  * @param ptr updated after the prefix in str in there is a match
  33  * @return non-zero if the prefix matches, zero otherwise
  34  */
  35 int av_strstart(const char *str, const char *pfx, const char **ptr);
  36
  37 /**
  38  * Return non-zero if pfx is a prefix of str independent of case. If
  39  * it is, *ptr is set to the address of the first character in str
  40  * after the prefix.
  41  *
  42  * @param str input string
  43  * @param pfx prefix to test
  44  * @param ptr updated after the prefix in str in there is a match
  45  * @return non-zero if the prefix matches, zero otherwise
  46  */
  47 int av_stristart(const char *str, const char *pfx, const char **ptr);
  48
  49 /**
  50  * Copy the string src to dst, but no more than size - 1 bytes, and
  51  * null terminate dst.
  52  *
  53  * This function is the same as BSD strlcpy().
  54  *
  55  * @param dst destination buffer
  56  * @param src source string
  57  * @param size size of destination buffer
  58  * @return the length of src
  59  */
  60 size_t av_strlcpy(char *dst, const char *src, size_t size);
  61
  62 /**
  63  * Append the string src to the string dst, but to a total length of
  64  * no more than size - 1 bytes, and null terminate dst.
  65  *
  66  * This function is similar to BSD strlcat(), but differs when
  67  * size <= strlen(dst).
  68  *
  69  * @param dst destination buffer
  70  * @param src source string
  71  * @param size size of destination buffer
  72  * @return the total length of src and dst
  73  */
  74 size_t av_strlcat(char *dst, const char *src, size_t size);
  75
  76 /**
  77  * Append output to a string, according to a format. Never write out of
  78  * the destination buffer, and and always put a terminating 0 within
  79  * the buffer.
  80  * @param dst destination buffer (string to which the output is
  81  *  appended)
  82  * @param size total size of the destination buffer
  83  * @param fmt printf-compatible format string, specifying how the
  84  *  following parameters are used
  85  * @return the length of the string that would have been generated
  86  *  if enough space had been available
  87  */
  88 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...);
  89
  90 #endif /* FFMPEG_AVSTRING_H */