getoldopt.c revision 1.19.2.1.2.1 
1/*	$NetBSD: getoldopt.c,v 1.19.2.1.2.1 2005/07/23 17:32:16 snj 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#if HAVE_NBTOOL_CONFIG_H
13#include "nbtool_config.h"
14#endif
15
16#include <sys/cdefs.h>
17#if !defined(lint)
18__RCSID("$NetBSD: getoldopt.c,v 1.19.2.1.2.1 2005/07/23 17:32:16 snj Exp $");
19#endif /* not lint */
20
21#if HAVE_NBTOOL_CONFIG_H
22#include "compat_getopt.h"
23#else
24#include <getopt.h>
25#endif
26#include <stdio.h>
27#include <string.h>
28#include <stdlib.h>
29#include <unistd.h>
30#include <sys/stat.h>
31#include "pax.h"
32#include "extern.h"
33
34int
35getoldopt(int argc, char **argv, const char *optstring,
36	struct option *longopts, int *idx)
37{
38	static char	*key;		/* Points to next keyletter */
39	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
40	char		c;
41	char		*place;
42
43	optarg = NULL;
44
45	if (key == NULL) {		/* First time */
46		if (argc < 2) return -1;
47		key = argv[1];
48		if (*key == '-')
49			use_getopt++;
50		else
51			optind = 2;
52	}
53
54	c = '\0';
55	if (!use_getopt) {
56		c = *key++;
57		if (c == '\0') {
58			key--;
59			use_getopt = 1;
60		}
61	}
62	if (use_getopt) {
63		if (longopts != NULL) {
64			return getopt_long(argc, argv, optstring,
65			    longopts, idx);
66		} else {
67			return getopt(argc, argv, optstring);
68		}
69	}
70
71	place = strchr(optstring, c);
72
73	if (place == NULL || c == ':') {
74		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
75		return('?');
76	}
77
78	place++;
79	if (*place == ':') {
80		if (optind < argc) {
81			optarg = argv[optind];
82			optind++;
83		} else {
84			fprintf(stderr, "%s: %c argument missing\n",
85				argv[0], c);
86			return('?');
87		}
88	}
89
90	return(c);
91}
92