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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#if defined(LIBC_SCCS) && !defined(lint)
34static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
35#endif /* LIBC_SCCS and not lint */
36
37#include "stand.h"
38#include <string.h>
39
40int	opterr = 1,		/* if error message should be printed */
41	optind = 1,		/* index into parent argv vector */
42	optopt,			/* character checked for validity */
43	optreset;		/* reset getopt */
44char	*optarg;		/* argument associated with option */
45
46#define	BADCH	(int)'?'
47#define	BADARG	(int)':'
48#define	EMSG	""
49
50/*
51 * getopt --
52 *	Parse argc/argv argument vector.
53 */
54int
55getopt(int nargc, char * const *nargv, const char *ostr)
56{
57	static char *place = EMSG;		/* option letter processing */
58	char *oli;				/* option letter list index */
59
60	if (optreset || !*place) {		/* update scanning pointer */
61		optreset = 0;
62		if (optind >= nargc || *(place = nargv[optind]) != '-') {
63			place = EMSG;
64			return (-1);
65		}
66		if (place[1] && *++place == '-') {	/* found "--" */
67			++optind;
68			place = EMSG;
69			return (-1);
70		}
71	}					/* option letter okay? */
72	if ((optopt = (int)*place++) == (int)':' ||
73	    !(oli = strchr(ostr, optopt))) {
74		/*
75		 * if the user didn't specify '-' as an option,
76		 * assume it means -1.
77		 */
78		if (optopt == (int)'-')
79			return (-1);
80		if (!*place)
81			++optind;
82		if (opterr && *ostr != ':')
83			(void)printf("illegal option -- %c\n", optopt);
84		return (BADCH);
85	}
86	if (*++oli != ':') {			/* don't need argument */
87		optarg = NULL;
88		if (!*place)
89			++optind;
90	}
91	else {					/* need an argument */
92		if (*place)			/* no white space */
93			optarg = place;
94		else if (nargc <= ++optind) {	/* no arg */
95			place = EMSG;
96			if (*ostr == ':')
97				return (BADARG);
98			if (opterr)
99				(void)printf("option requires an argument -- %c\n", optopt);
100			return (BADCH);
101		}
102	 	else				/* white space */
103			optarg = nargv[optind];
104		place = EMSG;
105		++optind;
106	}
107	return (optopt);			/* dump back option letter */
108}
109