getoldopt.c revision 1.15 
1/*	$NetBSD: getoldopt.c,v 1.15 2002/10/12 15:39:29 christos 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#if defined(__RCSID) && !defined(lint)
14__RCSID("$NetBSD: getoldopt.c,v 1.15 2002/10/12 15:39:29 christos Exp $");
15#endif /* not lint */
16
17#include <getopt.h>
18#include <stdio.h>
19#include <string.h>
20#include <stdlib.h>
21#include <unistd.h>
22#include <sys/stat.h>
23#include "pax.h"
24#include "extern.h"
25
26int
27getoldopt(int argc, char **argv, const char *optstring,
28	struct option *longopts, int *idx)
29{
30	static char	*key;		/* Points to next keyletter */
31	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
32	char		c;
33	char		*place;
34
35	optarg = NULL;
36
37	if (key == NULL) {		/* First time */
38		if (argc < 2) return -1;
39		key = argv[1];
40		if (*key == '-')
41			use_getopt++;
42		else
43			optind = 2;
44	}
45
46	if (use_getopt) {
47		if (longopts != NULL) {
48			/*
49			 * Setting POSIXLY_CORRECT here, makes getopt_long
50			 * stop argument processing at the first non-option.
51			 */
52			setenv("POSIXLY_CORRECT", "", 0);
53			return getopt_long(argc, argv, optstring,
54			    longopts, idx);
55		} else {
56			return getopt(argc, argv, optstring);
57		}
58	}
59
60	c = *key++;
61	if (c == '\0') {
62		key--;
63		return -1;
64	}
65	place = strchr(optstring, c);
66
67	if (place == NULL || c == ':') {
68		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
69		return('?');
70	}
71
72	place++;
73	if (*place == ':') {
74		if (optind < argc) {
75			optarg = argv[optind];
76			optind++;
77		} else {
78			fprintf(stderr, "%s: %c argument missing\n",
79				argv[0], c);
80			return('?');
81		}
82	}
83
84	return(c);
85}
86