1#include <config.h>
2
3/*
4 * $Id: getopt.c,v 1.4 2005/01/10 19:09:04 snsimon Exp $
5 * Copyright (c) 1987, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "@(#)getopt.c	8.2 (Berkeley) 4/2/94";
39#endif /* LIBC_SCCS and not lint */
40
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44
45int	opterr = 1,		/* if error message should be printed */
46	optind = 1,		/* index into parent argv vector */
47	optopt,			/* character checked for validity */
48	optreset;		/* reset getopt */
49char	*optarg;		/* argument associated with option */
50
51#define	BADCH	(int)'?'
52#define	BADARG	(int)':'
53#define	EMSG	""
54
55/*
56 * getopt --
57 *	Parse argc/argv argument vector.
58 */
59int
60getopt(
61	int nargc,
62	char * const *nargv,
63	const char *ostr)
64{
65	extern char *__progname;
66	static char *place = EMSG;		/* option letter processing */
67	char *oli;				/* option letter list index */
68
69	if (optreset || !*place) {		/* update scanning pointer */
70		optreset = 0;
71		if (optind >= nargc || *(place = nargv[optind]) != '-') {
72			place = EMSG;
73			return (EOF);
74		}
75		if (place[1] && *++place == '-') {	/* found "--" */
76			++optind;
77			place = EMSG;
78			return (EOF);
79		}
80	}					/* option letter okay? */
81	if ((optopt = (int)*place++) == (int)':' ||
82	    !(oli = strchr(ostr, optopt))) {
83		/*
84		 * if the user didn't specify '-' as an option,
85		 * assume it means EOF.
86		 */
87		if (optopt == (int)'-')
88			return (EOF);
89		if (!*place)
90			++optind;
91		if (opterr && *ostr != ':')
92			(void)fprintf(stderr,
93			    "%s: illegal option -- %c\n", __progname, optopt);
94		return (BADCH);
95	}
96	if (*++oli != ':') {			/* don't need argument */
97		optarg = NULL;
98		if (!*place)
99			++optind;
100	}
101	else {					/* need an argument */
102		if (*place)			/* no white space */
103			optarg = place;
104		else if (nargc <= ++optind) {	/* no arg */
105			place = EMSG;
106			if (*ostr == ':')
107				return (BADARG);
108			if (opterr)
109				(void)fprintf(stderr,
110				    "%s: option requires an argument -- %c\n",
111				    __progname, optopt);
112			return (BADCH);
113		}
114	 	else				/* white space */
115			optarg = nargv[optind];
116		place = EMSG;
117		++optind;
118	}
119	return (optopt);			/* dump back option letter */
120}
121