getopt.c revision 165903 
159191Skris/*	$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $	*/
259191Skris
359191Skris/*
459191Skris * Copyright (c) 1987, 1993, 1994
5325337Sjkim *	The Regents of the University of California.  All rights reserved.
659191Skris *
759191Skris * Redistribution and use in source and binary forms, with or without
859191Skris * modification, are permitted provided that the following conditions
959191Skris * are met:
1059191Skris * 1. Redistributions of source code must retain the above copyright
1159191Skris *    notice, this list of conditions and the following disclaimer.
1259191Skris * 2. Redistributions in binary form must reproduce the above copyright
1359191Skris *    notice, this list of conditions and the following disclaimer in the
14194206Ssimon *    documentation and/or other materials provided with the distribution.
1559191Skris * 4. Neither the name of the University nor the names of its contributors
1659191Skris *    may be used to endorse or promote products derived from this software
1759191Skris *    without specific prior written permission.
1859191Skris *
1959191Skris * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20109998Smarkm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2159191Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2259191Skris * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2359191Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2459191Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2559191Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2659191Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2759191Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2859191Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2959191Skris * SUCH DAMAGE.
3059191Skris */
3159191Skris
3259191Skris#if defined(LIBC_SCCS) && !defined(lint)
3359191Skrisstatic char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
3459191Skris#endif /* LIBC_SCCS and not lint */
3559191Skris#include <sys/cdefs.h>
3659191Skris__FBSDID("$FreeBSD: head/lib/libc/stdlib/getopt.c 165903 2007-01-09 00:28:16Z imp $");
3759191Skris
3859191Skris#include "namespace.h"
3968651Skris#include <stdio.h>
4059191Skris#include <stdlib.h>
4159191Skris#include <string.h>
4259191Skris#include <unistd.h>
4359191Skris#include "un-namespace.h"
4459191Skris
4559191Skris#include "libc_private.h"
46194206Ssimon
47194206Ssimonint	opterr = 1,		/* if error message should be printed */
48194206Ssimon	optind = 1,		/* index into parent argv vector */
49194206Ssimon	optopt,			/* character checked for validity */
5059191Skris	optreset;		/* reset getopt */
5159191Skrischar	*optarg;		/* argument associated with option */
5259191Skris
5359191Skris#define	BADCH	(int)'?'
5459191Skris#define	BADARG	(int)':'
5559191Skris#define	EMSG	""
5659191Skris
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