1/*	$OpenBSD: getoldopt.c,v 1.8 2003/07/02 21:19:33 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 Public Domain for your edification and enjoyment.
11 */
12
13#include <sys/cdefs.h>
14#ifndef lint
15__used static const char rcsid[] = "$OpenBSD: getoldopt.c,v 1.8 2003/07/02 21:19:33 deraadt Exp $";
16#endif /* not lint */
17
18#include <sys/types.h>
19#include <sys/stat.h>
20#include <stdio.h>
21#include <string.h>
22#include <unistd.h>
23#include "pax.h"
24#include "extern.h"
25
26int
27getoldopt(int argc, char **argv, const char *optstring)
28{
29	static char	*key;		/* Points to next keyletter */
30	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
31	char		c;
32	char		*place;
33
34	optarg = NULL;
35
36	if (key == NULL) {		/* First time */
37		if (argc < 2)
38			return (-1);
39		key = argv[1];
40		if (*key == '-')
41			use_getopt++;
42		else
43			optind = 2;
44	}
45
46	if (use_getopt)
47		return (getopt(argc, argv, optstring));
48
49	c = *key++;
50	if (c == '\0') {
51		key--;
52		return (-1);
53	}
54	place = strchr(optstring, c);
55
56	if (place == NULL || c == ':') {
57		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
58		return ('?');
59	}
60
61	place++;
62	if (*place == ':') {
63		if (optind < argc) {
64			optarg = argv[optind];
65			optind++;
66		} else {
67			fprintf(stderr, "%s: %c argument missing\n",
68				argv[0], c);
69			return ('?');
70		}
71	}
72
73	return (c);
74}
75