Remove Plan 9 support
[libav.git] / compat / getopt.c
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1/*
2 * This file is part of Libav.
3 *
4 * Libav 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 * Libav 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 Libav; 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
da8201cc
MS
33#include <stdio.h>
34#include <string.h>
35
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36static int opterr = 1;
37static int optind = 1;
38static int optopt;
39static char *optarg;
40
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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 optopt = c = argv[optind][sp];
f929ab05 56 if (c == ':' || !(cp = strchr(opts, c))) {
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57 fprintf(stderr, ": illegal option -- %c\n", c);
58 if (argv[optind][++sp] == '\0') {
59 optind++;
60 sp = 1;
61 }
62 return '?';
63 }
64 if (*++cp == ':') {
65 if (argv[optind][sp+1] != '\0')
66 optarg = &argv[optind++][sp+1];
67 else if(++optind >= argc) {
68 fprintf(stderr, ": option requires an argument -- %c\n", c);
69 sp = 1;
70 return '?';
71 } else
72 optarg = argv[optind++];
73 sp = 1;
74 } else {
75 if (argv[optind][++sp] == '\0') {
76 sp = 1;
77 optind++;
78 }
79 optarg = NULL;
80 }
81
82 return c;
83}