Initial import from FreeBSD RELENG_4:
[dragonfly.git] / bin / pax / getoldopt.c
CommitLineData
984263bc
MD
1/* $OpenBSD: getoldopt.c,v 1.4 2000/01/22 20:24:51 deraadt Exp $ */
2/* $NetBSD: getoldopt.c,v 1.3 1995/03/21 09:07:28 cgd Exp $ */
3
4/*
5 * Plug-compatible replacement for getopt() for parsing tar-like
6 * arguments. If the first argument begins with "-", it uses getopt;
7 * otherwise, it uses the old rules used by tar, dump, and ps.
8 *
9 * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
10 * in the Pubic Domain for your edification and enjoyment.
11 */
12
13#ifndef lint
14static const char rcsid[] = "$FreeBSD: src/bin/pax/getoldopt.c,v 1.1.2.1 2001/08/01 05:03:11 obrien Exp $";
15#endif /* not lint */
16
17#include <stdio.h>
18#include <string.h>
19#include <unistd.h>
20
21int
22getoldopt(argc, argv, optstring)
23 int argc;
24 char **argv;
25 char *optstring;
26{
27 static char *key; /* Points to next keyletter */
28 static char use_getopt; /* !=0 if argv[1][0] was '-' */
29 char c;
30 char *place;
31
32 optarg = NULL;
33
34 if (key == NULL) { /* First time */
35 if (argc < 2) return EOF;
36 key = argv[1];
37 if (*key == '-')
38 use_getopt++;
39 else
40 optind = 2;
41 }
42
43 if (use_getopt)
44 return getopt(argc, argv, optstring);
45
46 c = *key++;
47 if (c == '\0') {
48 key--;
49 return EOF;
50 }
51 place = strchr(optstring, c);
52
53 if (place == NULL || c == ':') {
54 fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
55 return('?');
56 }
57
58 place++;
59 if (*place == ':') {
60 if (optind < argc) {
61 optarg = argv[optind];
62 optind++;
63 } else {
64 fprintf(stderr, "%s: %c argument missing\n",
65 argv[0], c);
66 return('?');
67 }
68 }
69
70 return(c);
71}