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/*
* 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
*/

/*
* This file was copied from the following newsgroup posting:
*
* Newsgroups: mod.std.unix
* Subject: public domain AT&T getopt source
* Date: 3 Nov 85 19:34:15 GMT
*
* Here's something you've all been waiting for: the AT&T public domain
* source for getopt(3). It is the code which was given out at the 1985
* UNIFORUM conference in Dallas. I obtained it by electronic mail
* directly from AT&T. The people there assure me that it is indeed
* in the public domain.
*/

#include <stdio.h>
#include <string.h>

static int opterr = 1;
static int optind = 1;
static int optopt;
static char *optarg;

#undef fprintf

static int getopt(int argc, char *argv[], char *opts)
{
    static int sp = 1;
    int c;
    char *cp;

    if (sp == 1)
        if (optind >= argc ||
            argv[optind][0] != '-' || argv[optind][1] == '\0')
            return EOF;
        else if (!strcmp(argv[optind], "--")) {
            optind++;
            return EOF;
        }
    optopt = c = argv[optind][sp];
    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
        fprintf(stderr, ": illegal option -- %c\n", c);
        if (argv[optind][++sp] == '\0') {
            optind++;
            sp = 1;
        }
        return '?';
    }
    if (*++cp == ':') {
        if (argv[optind][sp+1] != '\0')
            optarg = &argv[optind++][sp+1];
        else if(++optind >= argc) {
            fprintf(stderr, ": option requires an argument -- %c\n", c);
            sp = 1;
            return '?';
        } else
            optarg = argv[optind++];
        sp = 1;
    } else {
        if (argv[optind][++sp] == '\0') {
            sp = 1;
            optind++;
        }
        optarg = NULL;
    }

    return c;
}
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