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ffmpeg / libavfilter / parseutils.c @ 2e032b32

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/*
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 * copyright (c) 2009 Stefano Sabatini
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file libavfilter/parseutils.c
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 * parsing utils
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 */
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#include <string.h>
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#include "libavutil/avutil.h"
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#include "parseutils.h"
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#define WHITESPACES " \n\t"
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char *av_get_token(const char **buf, const char *term)
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{
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    char *out = av_malloc(strlen(*buf) + 1);
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    char *ret= out, *end= out;
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    const char *p = *buf;
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    p += strspn(p, WHITESPACES);
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    while(*p && !strspn(p, term)) {
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        char c = *p++;
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        if(c == '\\' && *p){
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            *out++ = *p++;
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            end= out;
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        }else if(c == '\''){
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            while(*p && *p != '\'')
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                *out++ = *p++;
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            if(*p){
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                p++;
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                end= out;
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            }
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        }else{
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            *out++ = c;
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        }
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    }
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    do{
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        *out-- = 0;
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    }while(out >= end && strspn(out, WHITESPACES));
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    *buf = p;
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    return ret;
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}
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#ifdef TEST
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#undef printf
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int main(void)
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{
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    int i;
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    const char *strings[] = {
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        "''",
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        "",
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        ":",
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        "\\",
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        "'",
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        "    ''    :",
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        "    ''  ''  :",
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        "foo   '' :",
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        "'foo'",
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        "foo     ",
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        "foo\\",
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        "foo':  blah:blah",
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        "foo\\:  blah:blah",
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        "foo\'",
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        "'foo :  '  :blahblah",
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        "\\ :blah",
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        "     foo",
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        "      foo       ",
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        "      foo     \\ ",
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        "foo ':blah",
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        " foo   bar    :   blahblah",
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        "\\f\\o\\o",
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        "'foo : \\ \\  '   : blahblah",
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        "'\\fo\\o:': blahblah",
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        "\\'fo\\o\\:':  foo  '  :blahblah"
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    };
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    for (i=0; i < FF_ARRAY_ELEMS(strings); i++) {
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        const char *p= strings[i];
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        printf("|%s|", p);
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        printf(" -> |%s|", av_get_token(&p, ":"));
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        printf(" + |%s|\n", p);
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    }
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    return 0;
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}
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#endif