1/*	$NetBSD: getopt.c,v 1.1.1.1 2021/04/07 02:43:15 christos Exp $	*/
2/*	NetBSD: getopt.c,v 1.16 1999/12/02 13:15:56 kleink Exp 	*/
3
4/*
5 * Copyright (c) 1987, 1993, 1994, 1995
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. Neither the names of the copyright holders nor the names of its
17 *    contributors may be used to endorse or promote products derived from
18 *    this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
21 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#if 0
34static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
35#endif
36
37#include <assert.h>
38#include <errno.h>
39#include <stdio.h>
40#include <string.h>
41
42#define __P(x) x
43#define _DIAGASSERT(x) assert(x)
44
45#ifdef __weak_alias
46__weak_alias(getopt,_getopt);
47#endif
48
49
50int	opterr = 1,		/* if error message should be printed */
51	optind = 1,		/* index into parent argv vector */
52	optopt,			/* character checked for validity */
53	optreset;		/* reset getopt */
54char	*optarg;		/* argument associated with option */
55
56static char * _progname __P((char *));
57int getopt_internal __P((int, char * const *, const char *));
58
59static char *
60_progname(nargv0)
61	char * nargv0;
62{
63	char * tmp;
64
65	_DIAGASSERT(nargv0 != NULL);
66
67	tmp = strrchr(nargv0, '/');
68	if (tmp)
69		tmp++;
70	else
71		tmp = nargv0;
72	return(tmp);
73}
74
75#define	BADCH	(int)'?'
76#define	BADARG	(int)':'
77#define	EMSG	""
78
79/*
80 * getopt --
81 *	Parse argc/argv argument vector.
82 */
83int
84getopt(nargc, nargv, ostr)
85	int nargc;
86	char * const nargv[];
87	const char *ostr;
88{
89	static char *__progname = 0;
90	static char *place = EMSG;		/* option letter processing */
91	char *oli;				/* option letter list index */
92        __progname = __progname?__progname:_progname(*nargv);
93
94	_DIAGASSERT(nargv != NULL);
95	_DIAGASSERT(ostr != NULL);
96
97	if (optreset || !*place) {		/* update scanning pointer */
98		optreset = 0;
99		if (optind >= nargc || *(place = nargv[optind]) != '-') {
100			place = EMSG;
101			return (-1);
102		}
103		if (place[1] && *++place == '-'	/* found "--" */
104		    && place[1] == '\0') {
105			++optind;
106			place = EMSG;
107			return (-1);
108		}
109	}					/* option letter okay? */
110	if ((optopt = (int)*place++) == (int)':' ||
111	    !(oli = strchr(ostr, optopt))) {
112		/*
113		 * if the user didn't specify '-' as an option,
114		 * assume it means -1.
115		 */
116		if (optopt == (int)'-')
117			return (-1);
118		if (!*place)
119			++optind;
120		if (opterr && *ostr != ':')
121			(void)fprintf(stderr,
122			    "%s: illegal option -- %c\n", __progname, optopt);
123		return (BADCH);
124	}
125	if (*++oli != ':') {			/* don't need argument */
126		optarg = NULL;
127		if (!*place)
128			++optind;
129	}
130	else {					/* need an argument */
131		if (*place)			/* no white space */
132			optarg = place;
133		else if (nargc <= ++optind) {	/* no arg */
134			place = EMSG;
135			if (*ostr == ':')
136				return (BADARG);
137			if (opterr)
138				(void)fprintf(stderr,
139				    "%s: option requires an argument -- %c\n",
140				    __progname, optopt);
141			return (BADCH);
142		}
143	 	else				/* white space */
144			optarg = nargv[optind];
145		place = EMSG;
146		++optind;
147	}
148	return (optopt);			/* dump back option letter */
149}
150
151