getoldopt.c revision 1.8 
1/*	$NetBSD: getoldopt.c,v 1.8 2000/02/17 03:12:25 itohy 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 1.8 2000/02/17 03:12:25 itohy Exp $");
15#endif /* not lint */
16
17#include <stdio.h>
18#include <string.h>
19#include <unistd.h>
20#include <sys/stat.h>
21#include "pax.h"
22#include "extern.h"
23
24int
25getoldopt(argc, argv, optstring)
26	int	argc;
27	char	**argv;
28	char	*optstring;
29{
30	extern char	*optarg;	/* Points to next arg */
31	extern int	optind;		/* Global argv index */
32	static char	*key;		/* Points to next keyletter */
33	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
34	char		c;
35	char		*place;
36
37	optarg = NULL;
38
39	if (key == NULL) {		/* First time */
40		if (argc < 2) return -1;
41		key = argv[1];
42		if (*key == '-')
43			use_getopt++;
44		else
45			optind = 2;
46	}
47
48	if (use_getopt)
49		return getopt(argc, argv, optstring);
50
51	c = *key++;
52	if (c == '\0') {
53		key--;
54		return -1;
55	}
56	place = strchr(optstring, c);
57
58	if (place == NULL || c == ':') {
59		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
60		return('?');
61	}
62
63	place++;
64	if (*place == ':') {
65		if (optind < argc) {
66			optarg = argv[optind];
67			optind++;
68		} else {
69			fprintf(stderr, "%s: %c argument missing\n",
70				argv[0], c);
71			return('?');
72		}
73	}
74
75	return(c);
76}
77