1/*	$NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $	*/
2
3/*
4 * Copyright (c) 1987, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifdef HAVE_CONFIG_H
33# include "config.h"
34#endif
35#if !defined(HAVE_GETOPT) || defined(WANT_GETOPT_LONG) || defined(BROKEN_GETOPT)
36#include <sys/cdefs.h>
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41
42
43#define	BADCH	(int)'?'
44#define	BADARG	(int)':'
45#define	EMSG	""
46
47int	opterr = 1,		/* if error message should be printed */
48	optind = 1,		/* index into parent argv vector */
49	optopt = BADCH,		/* character checked for validity */
50	optreset;		/* reset getopt */
51char	*optarg;		/* argument associated with option */
52
53/*
54 * getopt --
55 *	Parse argc/argv argument vector.
56 */
57int
58getopt(int nargc, char * const nargv[], const char *ostr)
59{
60	extern char *__progname;
61	static const char *place = EMSG; 	/* option letter processing */
62	char *oli;				/* option letter list index */
63
64#ifndef BSD4_4
65	if (!__progname) {
66		if (__progname = strrchr(nargv[0], '/'))
67			++__progname;
68		else
69			__progname = nargv[0];
70	}
71#endif
72
73	if (optreset || *place == 0) {		/* update scanning pointer */
74		optreset = 0;
75		place = nargv[optind];
76		if (optind >= nargc || *place++ != '-') {
77			/* Argument is absent or is not an option */
78			place = EMSG;
79			return (-1);
80		}
81		optopt = *place++;
82		if (optopt == '-' && *place == 0) {
83			/* "--" => end of options */
84			++optind;
85			place = EMSG;
86			return (-1);
87		}
88		if (optopt == 0) {
89			/* Solitary '-', treat as a '-' option
90			   if the program (eg su) is looking for it. */
91			place = EMSG;
92			if (strchr(ostr, '-') == NULL)
93				return -1;
94			optopt = '-';
95		}
96	} else
97		optopt = *place++;
98
99	/* See if option letter is one the caller wanted... */
100	if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
101		if (*place == 0)
102			++optind;
103		if (opterr && *ostr != ':')
104			(void)fprintf(stderr,
105			    "%s: unknown option -- %c\n", __progname, optopt);
106		return (BADCH);
107	}
108
109	/* Does this option need an argument? */
110	if (oli[1] != ':') {
111		/* don't need argument */
112		optarg = NULL;
113		if (*place == 0)
114			++optind;
115	} else {
116		/* Option-argument is either the rest of this argument or the
117		   entire next argument. */
118		if (*place)
119			optarg = __UNCONST(place);
120		else if (oli[2] == ':')
121			/*
122			 * GNU Extension, for optional arguments if the rest of
123			 * the argument is empty, we return NULL
124			 */
125			optarg = NULL;
126		else if (nargc > ++optind)
127			optarg = nargv[optind];
128		else {
129			/* option-argument absent */
130			place = EMSG;
131			if (*ostr == ':')
132				return (BADARG);
133			if (opterr)
134				(void)fprintf(stderr,
135				    "%s: option requires an argument -- %c\n",
136				    __progname, optopt);
137			return (BADCH);
138		}
139		place = EMSG;
140		++optind;
141	}
142	return (optopt);			/* return option letter */
143}
144#endif
145#ifdef MAIN
146#ifndef BSD4_4
147char *__progname;
148#endif
149
150int
151main(argc, argv)
152	int argc;
153	char *argv[];
154{
155	int c;
156	char *opts = argv[1];
157
158	--argc;
159	++argv;
160
161	while ((c = getopt(argc, argv, opts)) != EOF) {
162		switch (c) {
163		case '-':
164			if (optarg)
165				printf("--%s ", optarg);
166			break;
167		case '?':
168			exit(1);
169			break;
170		default:
171			if (optarg)
172				printf("-%c %s ", c, optarg);
173			else
174				printf("-%c ", c);
175			break;
176		}
177	}
178
179	if (optind < argc) {
180		printf("-- ");
181		for (; optind < argc; ++optind) {
182			printf("%s ", argv[optind]);
183		}
184	}
185	printf("\n");
186	exit(0);
187}
188#endif
189