getopt.c revision 1305e95ba6ff9fa202d0818caf10405df4b0f648 
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. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/* OPENBSD ORIGINAL: lib/libc/stdlib/getopt.c */
31
32#include "includes.h"
33#if !defined(HAVE_GETOPT) || !defined(HAVE_GETOPT_OPTRESET)
34
35#if defined(LIBC_SCCS) && !defined(lint)
36static char *rcsid = "$OpenBSD: getopt.c,v 1.5 2003/06/02 20:18:37 millert Exp $";
37#endif /* LIBC_SCCS and not lint */
38
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42
43int	BSDopterr = 1,		/* if error message should be printed */
44	BSDoptind = 1,		/* index into parent argv vector */
45	BSDoptopt,		/* character checked for validity */
46	BSDoptreset;		/* reset getopt */
47char	*BSDoptarg;		/* argument associated with option */
48
49#define	BADCH	(int)'?'
50#define	BADARG	(int)':'
51#define	EMSG	""
52
53/*
54 * getopt --
55 *	Parse argc/argv argument vector.
56 */
57int
58BSDgetopt(nargc, nargv, ostr)
59	int nargc;
60	char * const *nargv;
61	const char *ostr;
62{
63	extern char *__progname;
64	static char *place = EMSG;		/* option letter processing */
65	char *oli;				/* option letter list index */
66
67	if (ostr == NULL)
68		return (-1);
69
70	if (BSDoptreset || !*place) {		/* update scanning pointer */
71		BSDoptreset = 0;
72		if (BSDoptind >= nargc || *(place = nargv[BSDoptind]) != '-') {
73			place = EMSG;
74			return (-1);
75		}
76		if (place[1] && *++place == '-') {	/* found "--" */
77			++BSDoptind;
78			place = EMSG;
79			return (-1);
80		}
81	}					/* option letter okay? */
82	if ((BSDoptopt = (int)*place++) == (int)':' ||
83	    !(oli = strchr(ostr, BSDoptopt))) {
84		/*
85		 * if the user didn't specify '-' as an option,
86		 * assume it means -1.
87		 */
88		if (BSDoptopt == (int)'-')
89			return (-1);
90		if (!*place)
91			++BSDoptind;
92		if (BSDopterr && *ostr != ':')
93			(void)fprintf(stderr,
94			    "%s: illegal option -- %c\n", __progname, BSDoptopt);
95		return (BADCH);
96	}
97	if (*++oli != ':') {			/* don't need argument */
98		BSDoptarg = NULL;
99		if (!*place)
100			++BSDoptind;
101	}
102	else {					/* need an argument */
103		if (*place)			/* no white space */
104			BSDoptarg = place;
105		else if (nargc <= ++BSDoptind) {	/* no arg */
106			place = EMSG;
107			if (*ostr == ':')
108				return (BADARG);
109			if (BSDopterr)
110				(void)fprintf(stderr,
111				    "%s: option requires an argument -- %c\n",
112				    __progname, BSDoptopt);
113			return (BADCH);
114		}
115	 	else				/* white space */
116			BSDoptarg = nargv[BSDoptind];
117		place = EMSG;
118		++BSDoptind;
119	}
120	return (BSDoptopt);			/* dump back option letter */
121}
122
123#endif /* !defined(HAVE_GETOPT) || !defined(HAVE_OPTRESET) */
124