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libavutil/avstring.c

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00001 /*
00002  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
00003  * Copyright (c) 2007 Mans Rullgard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include <stdarg.h>
00023 #include <stdio.h>
00024 #include <string.h>
00025 #include <ctype.h>
00026 #include "avstring.h"
00027 
00028 int av_strstart(const char *str, const char *pfx, const char **ptr)
00029 {
00030     while (*pfx && *pfx == *str) {
00031         pfx++;
00032         str++;
00033     }
00034     if (!*pfx && ptr)
00035         *ptr = str;
00036     return !*pfx;
00037 }
00038 
00039 int av_stristart(const char *str, const char *pfx, const char **ptr)
00040 {
00041     while (*pfx && toupper((unsigned)*pfx) == toupper((unsigned)*str)) {
00042         pfx++;
00043         str++;
00044     }
00045     if (!*pfx && ptr)
00046         *ptr = str;
00047     return !*pfx;
00048 }
00049 
00050 size_t av_strlcpy(char *dst, const char *src, size_t size)
00051 {
00052     size_t len = 0;
00053     while (++len < size && *src)
00054         *dst++ = *src++;
00055     if (len <= size)
00056         *dst = 0;
00057     return len + strlen(src) - 1;
00058 }
00059 
00060 size_t av_strlcat(char *dst, const char *src, size_t size)
00061 {
00062     size_t len = strlen(dst);
00063     if (size <= len + 1)
00064         return len + strlen(src);
00065     return len + av_strlcpy(dst + len, src, size - len);
00066 }
00067 
00068 size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
00069 {
00070     int len = strlen(dst);
00071     va_list vl;
00072 
00073     va_start(vl, fmt);
00074     len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
00075     va_end(vl);
00076 
00077     return len;
00078 }

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