1 /* $NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $ */
2
3 /*
4 * Copyright (c) 1987, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)getopt.c 8.3 (Berkeley) 4/27/95";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 #ifndef FSTACK
37 __FBSDID("$FreeBSD$");
38
39 #include "namespace.h"
40 #endif
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <unistd.h>
45 #ifndef FSTACK
46 #include "un-namespace.h"
47
48 #include "libc_private.h"
49 #else
50 #include "compat.h"
51 #endif
52
53 int opterr = 1, /* if error message should be printed */
54 optind = 1, /* index into parent argv vector */
55 optopt, /* character checked for validity */
56 optreset; /* reset getopt */
57 char *optarg; /* argument associated with option */
58
59 #define BADCH (int)'?'
60 #define BADARG (int)':'
61 #define EMSG ""
62
63 /*
64 * getopt --
65 * Parse argc/argv argument vector.
66 */
67 int
getopt(int nargc,char * const nargv[],const char * ostr)68 getopt(int nargc, char * const nargv[], const char *ostr)
69 {
70 static char *place = EMSG; /* option letter processing */
71 char *oli; /* option letter list index */
72
73 if (optreset || *place == 0) { /* update scanning pointer */
74 optreset = 0;
75 place = nargv[optind];
76 if (optind >= nargc || *place++ != '-') {
77 /* Argument is absent or is not an option */
78 place = EMSG;
79 return (-1);
80 }
81 optopt = *place++;
82 if (optopt == '-' && *place == 0) {
83 /* "--" => end of options */
84 ++optind;
85 place = EMSG;
86 return (-1);
87 }
88 if (optopt == 0) {
89 /* Solitary '-', treat as a '-' option
90 if the program (eg su) is looking for it. */
91 place = EMSG;
92 if (strchr(ostr, '-') == NULL)
93 return (-1);
94 optopt = '-';
95 }
96 } else
97 optopt = *place++;
98
99 /* See if option letter is one the caller wanted... */
100 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
101 if (*place == 0)
102 ++optind;
103 if (opterr && *ostr != ':')
104 (void)fprintf(stderr,
105 #ifndef FSTACK
106 "%s: illegal option -- %c\n", _getprogname(),
107 #else
108 "%s: illegal option -- %c\n", getprogname(),
109 #endif
110 optopt);
111 return (BADCH);
112 }
113
114 /* Does this option need an argument? */
115 if (oli[1] != ':') {
116 /* don't need argument */
117 optarg = NULL;
118 if (*place == 0)
119 ++optind;
120 } else {
121 /* Option-argument is either the rest of this argument or the
122 entire next argument. */
123 if (*place)
124 optarg = place;
125 else if (oli[2] == ':')
126 /*
127 * GNU Extension, for optional arguments if the rest of
128 * the argument is empty, we return NULL
129 */
130 optarg = NULL;
131 else if (nargc > ++optind)
132 optarg = nargv[optind];
133 else {
134 /* option-argument absent */
135 place = EMSG;
136 if (*ostr == ':')
137 return (BADARG);
138 if (opterr)
139 (void)fprintf(stderr,
140 #ifndef FSTACK
141 "%s: option requires an argument -- %c\n",
142 _getprogname(), optopt);
143 #else
144 "%s: option requires an argument -- %c\n",
145 getprogname(), optopt);
146 #endif
147 return (BADCH);
148 }
149 place = EMSG;
150 ++optind;
151 }
152 return (optopt); /* return option letter */
153 }
154