1/*	$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc 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#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include "namespace.h"
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <unistd.h>
43#include "un-namespace.h"
44
45#include "libc_private.h"
46
47int	opterr = 1,		/* if error message should be printed */
48	optind = 1,		/* index into parent argv vector */
49	optopt,			/* character checked for validity */
50	optreset;		/* reset getopt */
51char	*optarg;		/* argument associated with option */
52
53#define	BADCH	(int)'?'
54#define	BADARG	(int)':'
55#define	EMSG	""
56
57/*
58 * getopt --
59 *	Parse argc/argv argument vector.
60 */
61int
62getopt(nargc, nargv, ostr)
63	int nargc;
64	char * const nargv[];
65	const char *ostr;
66{
67	static char *place = EMSG;		/* option letter processing */
68	char *oli;				/* option letter list index */
69
70	if (optreset || *place == 0) {		/* update scanning pointer */
71		optreset = 0;
72		place = nargv[optind];
73		if (optind >= nargc || *place++ != '-') {
74			/* Argument is absent or is not an option */
75			place = EMSG;
76			return (-1);
77		}
78		optopt = *place++;
79		if (optopt == '-' && *place == 0) {
80			/* "--" => end of options */
81			++optind;
82			place = EMSG;
83			return (-1);
84		}
85		if (optopt == 0) {
86			/* Solitary '-', treat as a '-' option
87			   if the program (eg su) is looking for it. */
88			place = EMSG;
89			if (strchr(ostr, '-') == NULL)
90				return (-1);
91			optopt = '-';
92		}
93	} else
94		optopt = *place++;
95
96	/* See if option letter is one the caller wanted... */
97	if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
98		if (*place == 0)
99			++optind;
100		if (opterr && *ostr != ':')
101			(void)fprintf(stderr,
102			    "%s: illegal option -- %c\n", _getprogname(),
103			    optopt);
104		return (BADCH);
105	}
106
107	/* Does this option need an argument? */
108	if (oli[1] != ':') {
109		/* don't need argument */
110		optarg = NULL;
111		if (*place == 0)
112			++optind;
113	} else {
114		/* Option-argument is either the rest of this argument or the
115		   entire next argument. */
116		if (*place)
117			optarg = place;
118		else if (nargc > ++optind)
119			optarg = nargv[optind];
120		else {
121			/* option-argument absent */
122			place = EMSG;
123			if (*ostr == ':')
124				return (BADARG);
125			if (opterr)
126				(void)fprintf(stderr,
127				    "%s: option requires an argument -- %c\n",
128				    _getprogname(), optopt);
129			return (BADCH);
130		}
131		place = EMSG;
132		++optind;
133	}
134	return (optopt);			/* return option letter */
135}
136