getopt.c revision 1.1.1.3 
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(int nargc, char * const *nargv, const char *ostr)
60{
61	char *cp;
62	static char *__progname;
63	static char *place = EMSG;		/* option letter processing */
64	char *oli;				/* option letter list index */
65
66	if (__progname == NULL) {
67		if ((cp = strrchr(nargv[0], '/')) != NULL)
68			__progname = cp + 1;
69		else
70			__progname = nargv[0];
71	}
72	if (optreset || !*place) {		/* update scanning pointer */
73		optreset = 0;
74		if (optind >= nargc || *(place = nargv[optind]) != '-') {
75			place = EMSG;
76			return (-1);
77		}
78		if (place[1] && *++place == '-') {	/* found "--" */
79			++optind;
80			place = EMSG;
81			return (-1);
82		}
83	}
84	optopt = (int)*place++;
85	if (optopt == (int)':') {		/* option letter okay? */
86		if (!*place)
87			++optind;
88		if (opterr && *ostr != ':')
89			(void)fprintf(stderr,
90			    "%s: illegal option -- %c\n", __progname, optopt);
91		return (BADCH);
92	}
93	oli = strchr(ostr, optopt);
94	if (!oli) {
95		/*
96		 * if the user didn't specify '-' as an option,
97		 * assume it means -1.
98		 */
99		if (optopt == (int)'-')
100			return (-1);
101		if (!*place)
102			++optind;
103		if (opterr && *ostr != ':')
104			(void)fprintf(stderr,
105			    "%s: illegal option -- %c\n", __progname, optopt);
106		return (BADCH);
107	}
108	if (*++oli != ':') {			/* don't need argument */
109		optarg = NULL;
110		if (!*place)
111			++optind;
112	}
113	else {					/* need an argument */
114		if (*place)			/* no white space */
115			optarg = place;
116		else if (nargc <= ++optind) {	/* no arg */
117			place = EMSG;
118			if (*ostr == ':')
119				return (BADARG);
120			if (opterr)
121				(void)fprintf(stderr,
122				    "%s: option requires an argument -- %c\n",
123				    __progname, optopt);
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