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 static char EMSG[] = "";
58 /*
59 * getopt --
60 * Parse argc/argv argument vector.
61 */
62 int
getopt(int nargc,char * const nargv[],const char * ostr)63 getopt(int nargc, char * const nargv[], const char *ostr)
64 {
65 static char *place = EMSG; /* option letter processing */
66 char *oli; /* option letter list index */
67
68 if (optreset || *place == 0) { /* update scanning pointer */
69 optreset = 0;
70 place = nargv[optind];
71 if (optind >= nargc || *place++ != '-') {
72 /* Argument is absent or is not an option */
73 place = EMSG;
74 return (-1);
75 }
76 optopt = *place++;
77 if (optopt == '-' && *place == 0) {
78 /* "--" => end of options */
79 ++optind;
80 place = EMSG;
81 return (-1);
82 }
83 if (optopt == 0) {
84 /* Solitary '-', treat as a '-' option
85 if the program (eg su) is looking for it. */
86 place = EMSG;
87 if (strchr(ostr, '-') == NULL)
88 return (-1);
89 optopt = '-';
90 }
91 } else
92 optopt = *place++;
93
94 /* See if option letter is one the caller wanted... */
95 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
96 if (*place == 0)
97 ++optind;
98 if (opterr && *ostr != ':')
99 (void)fprintf(stderr,
100 "%s: illegal option -- %c\n", _getprogname(),
101 optopt);
102 return (BADCH);
103 }
104
105 /* Does this option need an argument? */
106 if (oli[1] != ':') {
107 /* don't need argument */
108 optarg = NULL;
109 if (*place == 0)
110 ++optind;
111 } else {
112 /* Option-argument is either the rest of this argument or the
113 entire next argument. */
114 if (*place)
115 optarg = place;
116 else if (oli[2] == ':')
117 /*
118 * GNU Extension, for optional arguments if the rest of
119 * the argument is empty, we return NULL
120 */
121 optarg = NULL;
122 else if (nargc > ++optind)
123 optarg = nargv[optind];
124 else {
125 /* option-argument absent */
126 place = EMSG;
127 if (*ostr == ':')
128 return (BADARG);
129 if (opterr)
130 (void)fprintf(stderr,
131 "%s: option requires an argument -- %c\n",
132 _getprogname(), optopt);
133 return (BADCH);
134 }
135 place = EMSG;
136 ++optind;
137 }
138 return (optopt); /* return option letter */
139 }
140