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	8.3 (Berkeley) 4/27/95";
36#endif /* LIBC_SCCS and not lint */
37
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41
42#include "getopt.h"
43
44int	opterr = 1,		/* if error message should be printed */
45	optind = 1,		/* index into parent argv vector */
46	optopt,			/* character checked for validity */
47	optreset;		/* reset getopt */
48char	*optarg;		/* argument associated with option */
49
50#define	BADCH	(int)'?'
51#define	BADARG	(int)':'
52#define	EMSG	""
53
54/*
55 * getopt --
56 *	Parse argc/argv argument vector.
57 */
58int
59getopt(nargc, nargv, ostr)
60	int nargc;
61	char * const *nargv;
62	const char *ostr;
63{
64	char *cp;
65	static char *__progname;
66	static char *place = EMSG;		/* option letter processing */
67	char *oli;				/* option letter list index */
68
69	if (__progname == NULL) {
70		if ((cp = strrchr(nargv[0], '/')) != NULL)
71			__progname = cp + 1;
72		else
73			__progname = nargv[0];
74	}
75	if (optreset || !*place) {		/* update scanning pointer */
76		optreset = 0;
77		if (optind >= nargc || *(place = nargv[optind]) != '-') {
78			place = EMSG;
79			return (-1);
80		}
81		if (place[1] && *++place == '-') {	/* found "--" */
82			++optind;
83			place = EMSG;
84			return (-1);
85		}
86	}					/* option letter okay? */
87	if ((optopt = (int)*place++) == (int)':' ||
88	    !(oli = strchr(ostr, optopt))) {
89		/*
90		 * if the user didn't specify '-' as an option,
91		 * assume it means -1.
92		 */
93		if (optopt == (int)'-')
94			return (-1);
95		if (!*place)
96			++optind;
97		if (opterr && *ostr != ':')
98			(void)fprintf(stderr,
99			    "%s: illegal option -- %c\n", __progname, optopt);
100		return (BADCH);
101	}
102	if (*++oli != ':') {			/* don't need argument */
103		optarg = NULL;
104		if (!*place)
105			++optind;
106	}
107	else {					/* need an argument */
108		if (*place)			/* no white space */
109			optarg = place;
110		else if (nargc <= ++optind) {	/* no arg */
111			place = EMSG;
112			if (*ostr == ':')
113				return (BADARG);
114			if (opterr)
115				(void)fprintf(stderr,
116				    "%s: option requires an argument -- %c\n",
117				    __progname, optopt);
118			return (BADCH);
119		}
120	 	else				/* white space */
121			optarg = nargv[optind];
122		place = EMSG;
123		++optind;
124	}
125	return (optopt);			/* dump back option letter */
126}
127