libavutil/avstring.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
   3  * Copyright (c) 2007 Mans Rullgard
   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 <stdarg.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25 #include <ctype.h>
  26 #include "avstring.h"
  27
  28 int av_strstart(const char *str, const char *pfx, const char **ptr)
  29 {
  30     while (*pfx && *pfx == *str) {
  31         pfx++;
  32         str++;
  33     }
  34     if (!*pfx && ptr)
  35         *ptr = str;
  36     return !*pfx;
  37 }
  38
  39 int av_stristart(const char *str, const char *pfx, const char **ptr)
  40 {
  41     while (*pfx && toupper((unsigned)*pfx) == toupper((unsigned)*str)) {
  42         pfx++;
  43         str++;
  44     }
  45     if (!*pfx && ptr)
  46         *ptr = str;
  47     return !*pfx;
  48 }
  49
  50 size_t av_strlcpy(char *dst, const char *src, size_t size)
  51 {
  52     size_t len = 0;
  53     while (++len < size && *src)
  54         *dst++ = *src++;
  55     if (len <= size)
  56         *dst = 0;
  57     return len + strlen(src) - 1;
  58 }
  59
  60 size_t av_strlcat(char *dst, const char *src, size_t size)
  61 {
  62     size_t len = strlen(dst);
  63     if (size <= len + 1)
  64         return len + strlen(src);
  65     return len + av_strlcpy(dst + len, src, size - len);
  66 }
  67
  68 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
  69 {
  70     int len = strlen(dst);
  71     va_list vl;
  72
  73     va_start(vl, fmt);
  74     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
  75     va_end(vl);
  76
  77     return len;
  78 }