1/*	$NetBSD: getopt.c,v 1.1 2006/04/07 14:21:29 cherry 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 * 3. 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/* from: netbsd:lib/libc/stdlib/getopt.c */
33
34#include <lib/libkern/libkern.h>
35#include <lib/libsa/stand.h>
36
37int	opterr = 1,		/* if error message should be printed */
38	optind = 1,		/* index into parent argv vector */
39	optopt,			/* character checked for validity */
40	optreset;		/* reset getopt */
41char	*optarg;		/* argument associated with option */
42
43#define	BADCH	(int)'?'
44#define	BADARG	(int)':'
45#define	EMSG	""
46
47/*
48 * getopt --
49 *	Parse argc/argv argument vector.
50 */
51int
52getopt(int nargc, char * const *nargv, const char *ostr)
53{
54	static char *place = EMSG;		/* option letter processing */
55	char *oli;				/* option letter list index */
56
57	if (optreset || !*place) {		/* update scanning pointer */
58		optreset = 0;
59		if (optind >= nargc || *(place = nargv[optind]) != '-') {
60			place = EMSG;
61			return (-1);
62		}
63		if (place[1] && *++place == '-') {	/* found "--" */
64			++optind;
65			place = EMSG;
66			return (-1);
67		}
68	}					/* option letter okay? */
69	if ((optopt = (int)*place++) == (int)':' ||
70	    !(oli = strchr(ostr, optopt))) {
71		/*
72		 * if the user didn't specify '-' as an option,
73		 * assume it means -1.
74		 */
75		if (optopt == (int)'-')
76			return (-1);
77		if (!*place)
78			++optind;
79		if (opterr && *ostr != ':')
80			printf("illegal option -- %c\n", optopt);
81		return (BADCH);
82	}
83	if (*++oli != ':') {			/* don't need argument */
84		optarg = NULL;
85		if (!*place)
86			++optind;
87	}
88	else {					/* need an argument */
89		if (*place)			/* no white space */
90			optarg = place;
91		else if (nargc <= ++optind) {	/* no arg */
92			place = EMSG;
93			if (*ostr == ':')
94				return (BADARG);
95			if (opterr)
96				printf("option requires an argument -- %c\n",
97				       optopt);
98			return (BADCH);
99		}
100	 	else				/* white space */
101			optarg = nargv[optind];
102		place = EMSG;
103		++optind;
104	}
105	return (optopt);			/* dump back option letter */
106}
107