getopt.c revision 93399 
1/*
2 * Copyright (c) 1987, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/stdlib/getopt.c 93399 2002-03-29 22:43:43Z markm $");
39
40#include "namespace.h"
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include "un-namespace.h"
45
46#include "libc_private.h"
47
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
54#define	BADCH	(int)'?'
55#define	BADARG	(int)':'
56#define	EMSG	""
57
58/*
59 * getopt --
60 *	Parse argc/argv argument vector.
61 */
62int
63getopt(nargc, nargv, ostr)
64	int nargc;
65	char * const *nargv;
66	const char *ostr;
67{
68	static char *place = EMSG;		/* option letter processing */
69	char *oli;				/* option letter list index */
70
71	if (optreset || !*place) {		/* update scanning pointer */
72		optreset = 0;
73		if (optind >= nargc || *(place = nargv[optind]) != '-') {
74			place = EMSG;
75			return (-1);
76		}
77		if (place[1] && *++place == '-') {	/* found "--" */
78			++optind;
79			place = EMSG;
80			return (-1);
81		}
82	}					/* option letter okay? */
83	if ((optopt = (int)*place++) == (int)':' ||
84	    !(oli = strchr(ostr, optopt))) {
85		/*
86		 * if the user didn't specify '-' as an option,
87		 * assume it means -1.
88		 */
89		if (optopt == (int)'-')
90			return (-1);
91		if (!*place)
92			++optind;
93		if (opterr && *ostr != ':' && optopt != BADCH)
94			(void)fprintf(stderr, "%s: illegal option -- %c\n",
95			    _getprogname(), optopt);
96		return (BADCH);
97	}
98	if (*++oli != ':') {			/* don't need argument */
99		optarg = NULL;
100		if (!*place)
101			++optind;
102	}
103	else {					/* need an argument */
104		if (*place)			/* no white space */
105			optarg = place;
106		else if (nargc <= ++optind) {	/* no arg */
107			place = EMSG;
108			if (*ostr == ':')
109				return (BADARG);
110			if (opterr)
111				(void)fprintf(stderr,
112				    "%s: option requires an argument -- %c\n",
113				    _getprogname(), optopt);
114			return (BADCH);
115		}
116	 	else				/* white space */
117			optarg = nargv[optind];
118		place = EMSG;
119		++optind;
120	}
121	return (optopt);			/* dump back option letter */
122}
123