1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/*
20 * This file was copied from the following newsgroup posting:
21 *
22 * Newsgroups: mod.std.unix
23 * Subject: public domain AT&T getopt source
24 * Date: 3 Nov 85 19:34:15 GMT
25 *
26 * Here's something you've all been waiting for:  the AT&T public domain
27 * source for getopt(3).  It is the code which was given out at the 1985
28 * UNIFORUM conference in Dallas.  I obtained it by electronic mail
29 * directly from AT&T.  The people there assure me that it is indeed
30 * in the public domain.
31 */
32
33#include <stdio.h>
34#include <string.h>
35
36static int opterr = 1;
37static int optind = 1;
38static int optopt;
39static char *optarg;
40
41static int getopt(int argc, char *argv[], char *opts)
42{
43    static int sp = 1;
44    int c;
45    char *cp;
46
47    if (sp == 1) {
48        if (optind >= argc ||
49            argv[optind][0] != '-' || argv[optind][1] == '\0')
50            return EOF;
51        else if (!strcmp(argv[optind], "--")) {
52            optind++;
53            return EOF;
54        }
55    }
56    optopt = c = argv[optind][sp];
57    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
58        fprintf(stderr, ": illegal option -- %c\n", c);
59        if (argv[optind][++sp] == '\0') {
60            optind++;
61            sp = 1;
62        }
63        return '?';
64    }
65    if (*++cp == ':') {
66        if (argv[optind][sp+1] != '\0')
67            optarg = &argv[optind++][sp+1];
68        else if(++optind >= argc) {
69            fprintf(stderr, ": option requires an argument -- %c\n", c);
70            sp = 1;
71            return '?';
72        } else
73            optarg = argv[optind++];
74        sp = 1;
75    } else {
76        if (argv[optind][++sp] == '\0') {
77            sp = 1;
78            optind++;
79        }
80        optarg = NULL;
81    }
82
83    return c;
84}
85