1 /* $NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1987, 1993, 1994
7 * The Regents of the University of California. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. 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)
35 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
36 #endif /* LIBC_SCCS and not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 #include "namespace.h"
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #include "un-namespace.h"
46
47 #include "libc_private.h"
48
49 int opterr = 1, /* if error message should be printed */
50 optind = 1, /* index into parent argv vector */
51 optopt, /* character checked for validity */
52 optreset; /* reset getopt */
53 char *optarg; /* argument associated with option */
54
55 #define BADCH (int)'?'
56 #define BADARG (int)':'
57 #define EMSG ""
58
59 /*
60 * getopt --
61 * Parse argc/argv argument vector.
62 */
63 int
getopt(int nargc,char * const nargv[],const char * ostr)64 getopt(int nargc, char * const nargv[], const char *ostr)
65 {
66 static char *place = EMSG; /* option letter processing */
67 char *oli; /* option letter list index */
68
69 if (optreset || *place == 0) { /* update scanning pointer */
70 optreset = 0;
71 place = nargv[optind];
72 if (optind >= nargc || *place++ != '-') {
73 /* Argument is absent or is not an option */
74 place = EMSG;
75 return (-1);
76 }
77 optopt = *place++;
78 if (optopt == '-' && *place == 0) {
79 /* "--" => end of options */
80 ++optind;
81 place = EMSG;
82 return (-1);
83 }
84 if (optopt == 0) {
85 /* Solitary '-', treat as a '-' option
86 if the program (eg su) is looking for it. */
87 place = EMSG;
88 if (strchr(ostr, '-') == NULL)
89 return (-1);
90 optopt = '-';
91 }
92 } else
93 optopt = *place++;
94
95 /* See if option letter is one the caller wanted... */
96 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
97 if (*place == 0)
98 ++optind;
99 if (opterr && *ostr != ':')
100 (void)fprintf(stderr,
101 "%s: illegal option -- %c\n", _getprogname(),
102 optopt);
103 return (BADCH);
104 }
105
106 /* Does this option need an argument? */
107 if (oli[1] != ':') {
108 /* don't need argument */
109 optarg = NULL;
110 if (*place == 0)
111 ++optind;
112 } else {
113 /* Option-argument is either the rest of this argument or the
114 entire next argument. */
115 if (*place)
116 optarg = place;
117 else if (oli[2] == ':')
118 /*
119 * GNU Extension, for optional arguments if the rest of
120 * the argument is empty, we return NULL
121 */
122 optarg = NULL;
123 else if (nargc > ++optind)
124 optarg = nargv[optind];
125 else {
126 /* option-argument absent */
127 place = EMSG;
128 if (*ostr == ':')
129 return (BADARG);
130 if (opterr)
131 (void)fprintf(stderr,
132 "%s: option requires an argument -- %c\n",
133 _getprogname(), optopt);
134 return (BADCH);
135 }
136 place = EMSG;
137 ++optind;
138 }
139 return (optopt); /* return option letter */
140 }
141