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
28int 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
39int 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
50size_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
60size_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
68size_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}
79