avstring.c 4.17 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
/*
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
 * Copyright (c) 2007 Mans Rullgard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

22 23
#include <stdarg.h>
#include <stdio.h>
24 25 26
#include <string.h>
#include <ctype.h>
#include "avstring.h"
27
#include "mem.h"
28 29 30

int av_strstart(const char *str, const char *pfx, const char **ptr)
{
31 32 33 34
    while (*pfx && *pfx == *str) {
        pfx++;
        str++;
    }
35 36 37 38 39 40 41
    if (!*pfx && ptr)
        *ptr = str;
    return !*pfx;
}

int av_stristart(const char *str, const char *pfx, const char **ptr)
{
42 43 44 45
    while (*pfx && toupper((unsigned)*pfx) == toupper((unsigned)*str)) {
        pfx++;
        str++;
    }
46 47 48 49 50
    if (!*pfx && ptr)
        *ptr = str;
    return !*pfx;
}

51 52 53 54 55 56 57 58 59 60 61 62 63
char *av_stristr(const char *s1, const char *s2)
{
    if (!*s2)
        return s1;

    do {
        if (av_stristart(s1, s2, NULL))
            return s1;
    } while (*s1++);

    return NULL;
}

64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
size_t av_strlcpy(char *dst, const char *src, size_t size)
{
    size_t len = 0;
    while (++len < size && *src)
        *dst++ = *src++;
    if (len <= size)
        *dst = 0;
    return len + strlen(src) - 1;
}

size_t av_strlcat(char *dst, const char *src, size_t size)
{
    size_t len = strlen(dst);
    if (size <= len + 1)
        return len + strlen(src);
    return len + av_strlcpy(dst + len, src, size - len);
}
81 82 83 84 85 86 87 88 89 90 91 92

size_t av_strlcatf(char *dst, size_t size, const char *fmt, ...)
{
    int len = strlen(dst);
    va_list vl;

    va_start(vl, fmt);
    len += vsnprintf(dst + len, size > len ? size - len : 0, fmt, vl);
    va_end(vl);

    return len;
}
93

94 95
char *av_d2str(double d)
{
96 97 98 99
    char *str= av_malloc(16);
    if(str) snprintf(str, 16, "%f", d);
    return str;
}
100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187

#define WHITESPACES " \n\t"

char *av_get_token(const char **buf, const char *term)
{
    char *out = av_malloc(strlen(*buf) + 1);
    char *ret= out, *end= out;
    const char *p = *buf;
    if (!out) return NULL;
    p += strspn(p, WHITESPACES);

    while(*p && !strspn(p, term)) {
        char c = *p++;
        if(c == '\\' && *p){
            *out++ = *p++;
            end= out;
        }else if(c == '\''){
            while(*p && *p != '\'')
                *out++ = *p++;
            if(*p){
                p++;
                end= out;
            }
        }else{
            *out++ = c;
        }
    }

    do{
        *out-- = 0;
    }while(out >= end && strspn(out, WHITESPACES));

    *buf = p;

    return ret;
}

#ifdef TEST

#undef printf

int main(void)
{
    int i;

    printf("Testing av_get_token()\n");
    {
        const char *strings[] = {
            "''",
            "",
            ":",
            "\\",
            "'",
            "    ''    :",
            "    ''  ''  :",
            "foo   '' :",
            "'foo'",
            "foo     ",
            "  '  foo  '  ",
            "foo\\",
            "foo':  blah:blah",
            "foo\\:  blah:blah",
            "foo\'",
            "'foo :  '  :blahblah",
            "\\ :blah",
            "     foo",
            "      foo       ",
            "      foo     \\ ",
            "foo ':blah",
            " foo   bar    :   blahblah",
            "\\f\\o\\o",
            "'foo : \\ \\  '   : blahblah",
            "'\\fo\\o:': blahblah",
            "\\'fo\\o\\:':  foo  '  :blahblah"
        };

        for (i=0; i < FF_ARRAY_ELEMS(strings); i++) {
            const char *p= strings[i];
            printf("|%s|", p);
            printf(" -> |%s|", av_get_token(&p, ":"));
            printf(" + |%s|\n", p);
        }
    }

    return 0;
}

#endif /* TEST */