1/*	$NetBSD: getopt.c,v 1.16 1999/12/02 13:15:56 kleink 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#if 0
37static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
38#endif
39
40#include <assert.h>
41#include <errno.h>
42#include <stdio.h>
43#include <string.h>
44
45#define __P(x) x
46#define _DIAGASSERT(x) assert(x)
47
48#ifdef __weak_alias
49__weak_alias(getopt,_getopt);
50#endif
51
52
53int	opterr = 1,		/* if error message should be printed */
54	optind = 1,		/* index into parent argv vector */
55	optopt,			/* character checked for validity */
56	optreset;		/* reset getopt */
57char	*optarg;		/* argument associated with option */
58
59static char * _progname __P((char *));
60int getopt_internal __P((int, char * const *, const char *));
61
62static char *
63_progname(nargv0)
64	char * nargv0;
65{
66	char * tmp;
67
68	_DIAGASSERT(nargv0 != NULL);
69
70	tmp = strrchr(nargv0, '/');
71	if (tmp)
72		tmp++;
73	else
74		tmp = nargv0;
75	return(tmp);
76}
77
78#define	BADCH	(int)'?'
79#define	BADARG	(int)':'
80#define	EMSG	""
81
82/*
83 * getopt --
84 *	Parse argc/argv argument vector.
85 */
86int
87getopt(nargc, nargv, ostr)
88	int nargc;
89	char * const nargv[];
90	const char *ostr;
91{
92	static char *__progname = 0;
93	static char *place = EMSG;		/* option letter processing */
94	char *oli;				/* option letter list index */
95        __progname = __progname?__progname:_progname(*nargv);
96
97	_DIAGASSERT(nargv != NULL);
98	_DIAGASSERT(ostr != NULL);
99
100	if (optreset || !*place) {		/* update scanning pointer */
101		optreset = 0;
102		if (optind >= nargc || *(place = nargv[optind]) != '-') {
103			place = EMSG;
104			return (-1);
105		}
106		if (place[1] && *++place == '-'	/* found "--" */
107		    && place[1] == '\0') {
108			++optind;
109			place = EMSG;
110			return (-1);
111		}
112	}					/* option letter okay? */
113	if ((optopt = (int)*place++) == (int)':' ||
114	    !(oli = strchr(ostr, optopt))) {
115		/*
116		 * if the user didn't specify '-' as an option,
117		 * assume it means -1.
118		 */
119		if (optopt == (int)'-')
120			return (-1);
121		if (!*place)
122			++optind;
123		if (opterr && *ostr != ':')
124			(void)fprintf(stderr,
125			    "%s: illegal option -- %c\n", __progname, optopt);
126		return (BADCH);
127	}
128	if (*++oli != ':') {			/* don't need argument */
129		optarg = NULL;
130		if (!*place)
131			++optind;
132	}
133	else {					/* need an argument */
134		if (*place)			/* no white space */
135			optarg = place;
136		else if (nargc <= ++optind) {	/* no arg */
137			place = EMSG;
138			if (*ostr == ':')
139				return (BADARG);
140			if (opterr)
141				(void)fprintf(stderr,
142				    "%s: option requires an argument -- %c\n",
143				    __progname, optopt);
144			return (BADCH);
145		}
146	 	else				/* white space */
147			optarg = nargv[optind];
148		place = EMSG;
149		++optind;
150	}
151	return (optopt);			/* dump back option letter */
152}
153
154