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 * 4. 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: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $");
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
47#ifndef BUILDING_VARIANT
48int	opterr = 1,		/* if error message should be printed */
49	optind = 1,		/* index into parent argv vector */
50	optopt,			/* character checked for validity */
51	optreset;		/* reset getopt */
52char	*optarg;		/* argument associated with option */
53#endif /* !BUILDING_VARIANT */
54
55#define	BADCH	(int)'?'
56#define	BADARG	(int)':'
57#define	EMSG	""
58
59#if __DARWIN_UNIX03
60#define PROGNAME nargv[0]
61#else
62#define PROGNAME _getprogname()
63#endif
64
65/*
66 * getopt --
67 *	Parse argc/argv argument vector.
68 */
69int
70getopt(nargc, nargv, ostr)
71	int nargc;
72	char * const nargv[];
73	const char *ostr;
74{
75	static char *place = EMSG;		/* option letter processing */
76	char *oli;				/* option letter list index */
77
78	if (optreset || *place == 0) {		/* update scanning pointer */
79		optreset = 0;
80		place = nargv[optind];
81		if (optind >= nargc || *place++ != '-') {
82			/* Argument is absent or is not an option */
83			place = EMSG;
84			return (-1);
85		}
86		optopt = *place++;
87		if (optopt == '-' && *place == 0) {
88			/* "--" => end of options */
89			++optind;
90			place = EMSG;
91			return (-1);
92		}
93		if (optopt == 0) {
94			/* Solitary '-', treat as a '-' option
95			   if the program (eg su) is looking for it. */
96			place = EMSG;
97			if (strchr(ostr, '-') == NULL)
98				return (-1);
99			optopt = '-';
100		}
101	} else
102		optopt = *place++;
103
104	/* See if option letter is one the caller wanted... */
105	if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
106		if (*place == 0)
107			++optind;
108		if (opterr && *ostr != ':')
109			(void)fprintf(stderr,
110			    "%s: illegal option -- %c\n",
111			    PROGNAME, optopt);
112		return (BADCH);
113	}
114
115	/* Does this option need an argument? */
116	if (oli[1] != ':') {
117		/* don't need argument */
118		optarg = NULL;
119		if (*place == 0)
120			++optind;
121	} else {
122		/* Option-argument is either the rest of this argument or the
123		   entire next argument. */
124		if (*place)
125			optarg = place;
126		else if (nargc > ++optind)
127			optarg = nargv[optind];
128		else {
129			/* option-argument absent */
130#if __DARWIN_UNIX03
131			/* Yes, the standard will put optind past the last
132			   argument */
133			++optind;
134			optarg = NULL;
135#endif /* __DARWIN_UNIX03 */
136			place = EMSG;
137			if (*ostr == ':')
138				return (BADARG);
139			if (opterr)
140				(void)fprintf(stderr,
141				    "%s: option requires an argument -- %c\n",
142				    PROGNAME, optopt);
143			return (BADCH);
144		}
145		place = EMSG;
146		++optind;
147	}
148	return (optopt);			/* return option letter */
149}
150