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#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/lib/libstand/getopt.c 84221 2001-09-30 22:28:01Z dillon $");
36
37#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
39#endif /* LIBC_SCCS and not lint */
40
41#include "stand.h"
42#include <string.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 static char *place = EMSG; /* option letter processing */
65 char *oli; /* option letter list index */
66
67 if (optreset || !*place) { /* update scanning pointer */
68 optreset = 0;
69 if (optind >= nargc || *(place = nargv[optind]) != '-') {
70 place = EMSG;
71 return (-1);
72 }
73 if (place[1] && *++place == '-') { /* found "--" */
74 ++optind;
75 place = EMSG;
76 return (-1);
77 }
78 } /* option letter okay? */
79 if ((optopt = (int)*place++) == (int)':' ||
80 !(oli = strchr(ostr, optopt))) {
81 /*
82 * if the user didn't specify '-' as an option,
83 * assume it means -1.
84 */
85 if (optopt == (int)'-')
86 return (-1);
87 if (!*place)
88 ++optind;
89 if (opterr && *ostr != ':')
90 (void)printf("illegal option -- %c\n", 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)printf("option requires an argument -- %c\n", optopt);
107 return (BADCH);
108 }
109 else /* white space */
110 optarg = nargv[optind];
111 place = EMSG;
112 ++optind;
113 }
114 return (optopt); /* dump back option letter */
115}