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