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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)getopt.c	8.2 (Berkeley) 4/2/94";
36#endif /* LIBC_SCCS and not lint */
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41
42#ifndef WIN32
43extern char *__progname;
44#endif
45
46int	opterr = 1,		/* if error message should be printed */
47	optind = 1,		/* index into parent argv vector */
48	optopt,			/* character checked for validity */
49	optreset;		/* reset getopt */
50char	*optarg;		/* argument associated with option */
51
52#define	BADCH	(int)'?'
53#define	BADARG	(int)':'
54#define	EMSG	""
55
56/*
57 * getopt --
58 *	Parse argc/argv argument vector.
59 */
60int
61getopt(nargc, nargv, ostr)
62	int nargc;
63	char * const *nargv;
64	const char *ostr;
65{
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#ifndef WIN32
93			(void)fprintf(stderr,
94			    "%s: illegal option -- %c\n", __progname, optopt);
95#else
96			(void)fprintf(stderr,
97			    "illegal option -- %c\n", optopt);
98#endif
99		return (BADCH);
100	}
101	if (*++oli != ':') {			/* don't need argument */
102		optarg = NULL;
103		if (!*place)
104			++optind;
105	}
106	else {					/* need an argument */
107		if (*place)			/* no white space */
108			optarg = place;
109		else if (nargc <= ++optind) {	/* no arg */
110			place = EMSG;
111			if (*ostr == ':')
112				return (BADARG);
113			if (opterr)
114#ifndef WIN32
115				(void)fprintf(stderr,
116				    "%s: option requires an argument -- %c\n",
117				    __progname, optopt);
118#else
119				(void)fprintf(stderr,
120				    "option requires an argument -- %c\n",
121				    optopt);
122#endif
123
124			return (BADCH);
125		}
126	 	else				/* white space */
127			optarg = nargv[optind];
128		place = EMSG;
129		++optind;
130	}
131	return (optopt);			/* dump back option letter */
132}
133
134
135