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#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/stdlib/getopt.c 92986 2002-03-22 21:53:29Z obrien $");
39
40#include <stdio.h>
41#include <stdlib.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 extern char *__progname;
65 static char *place = EMSG; /* option letter processing */
66 char *oli; /* option letter list index */
67
68 if (optreset || !*place) { /* update scanning pointer */
69 optreset = 0;
70 if (optind >= nargc || *(place = nargv[optind]) != '-') {
71 place = EMSG;
72 return (-1);
73 }
74 if (place[1] && *++place == '-') { /* found "--" */
75 ++optind;
76 place = EMSG;
77 return (-1);
78 }
79 } /* option letter okay? */
80 if ((optopt = (int)*place++) == (int)':' ||
81 !(oli = strchr(ostr, optopt))) {
82 /*
83 * if the user didn't specify '-' as an option,
84 * assume it means -1.
85 */
86 if (optopt == (int)'-')
87 return (-1);
88 if (!*place)
89 ++optind;
90 if (opterr && *ostr != ':' && optopt != BADCH)
91 (void)fprintf(stderr,
92 "%s: illegal option -- %c\n", __progname, optopt);
93 return (BADCH);
94 }
95 if (*++oli != ':') { /* don't need argument */
96 optarg = NULL;
97 if (!*place)
98 ++optind;
99 }
100 else { /* need an argument */
101 if (*place) /* no white space */
102 optarg = place;
103 else if (nargc <= ++optind) { /* no arg */
104 place = EMSG;
105 if (*ostr == ':')
106 return (BADARG);
107 if (opterr)
108 (void)fprintf(stderr,
109 "%s: option requires an argument -- %c\n",
110 __progname, optopt);
111 return (BADCH);
112 }
113 else /* white space */
114 optarg = nargv[optind];
115 place = EMSG;
116 ++optind;
117 }
118 return (optopt); /* dump back option letter */
119}