getoldopt.c revision 1.10 
1/*	$NetBSD: getoldopt.c,v 1.10 2000/07/04 17:17:49 thorpej Exp $	*/
2
3/*
4 * Plug-compatible replacement for getopt() for parsing tar-like
5 * arguments.  If the first argument begins with "-", it uses getopt;
6 * otherwise, it uses the old rules used by tar, dump, and ps.
7 *
8 * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu) and placed
9 * in the Public Domain for your edification and enjoyment.
10 */
11
12#include <sys/cdefs.h>
13#ifndef lint
14__RCSID("$NetBSD: getoldopt.c,v 1.10 2000/07/04 17:17:49 thorpej Exp $");
15#endif /* not lint */
16
17#include <stdio.h>
18#include <string.h>
19#include <unistd.h>
20#include <getopt.h>
21#include <sys/stat.h>
22#include "pax.h"
23#include "extern.h"
24
25int
26getoldopt(argc, argv, optstring, longopts, index)
27	int	argc;
28	char	**argv;
29	const char *optstring;
30	struct option *longopts;
31	int	*index;
32{
33	static char	*key;		/* Points to next keyletter */
34	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
35	char		c;
36	char		*place;
37
38	optarg = NULL;
39
40	if (key == NULL) {		/* First time */
41		if (argc < 2) return -1;
42		key = argv[1];
43		if (*key == '-')
44			use_getopt++;
45		else
46			optind = 2;
47	}
48
49	if (use_getopt)
50		return ((longopts != NULL) ?
51			getopt_long(argc, argv, optstring, longopts, index) :
52			getopt(argc, argv, optstring));
53
54	c = *key++;
55	if (c == '\0') {
56		key--;
57		return -1;
58	}
59	place = strchr(optstring, c);
60
61	if (place == NULL || c == ':') {
62		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
63		return('?');
64	}
65
66	place++;
67	if (*place == ':') {
68		if (optind < argc) {
69			optarg = argv[optind];
70			optind++;
71		} else {
72			fprintf(stderr, "%s: %c argument missing\n",
73				argv[0], c);
74			return('?');
75		}
76	}
77
78	return(c);
79}
80