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 #include "namespace.h"
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <unistd.h>
39 #include "un-namespace.h"
40
41 #include "libc_private.h"
42
43 int opterr = 1, /* if error message should be printed */
44 optind = 1, /* index into parent argv vector */
45 optopt, /* character checked for validity */
46 optreset; /* reset getopt */
47 char *optarg; /* argument associated with option */
48
49 #define BADCH (int)'?'
50 #define BADARG (int)':'
51 static char EMSG[] = "";
52 /*
53 * getopt --
54 * Parse argc/argv argument vector.
55 */
56 int
getopt(int nargc,char * const nargv[],const char * ostr)57 getopt(int nargc, char * const nargv[], const char *ostr)
58 {
59 static char *place = EMSG; /* option letter processing */
60 char *oli; /* option letter list index */
61
62 if (optreset || *place == 0) { /* update scanning pointer */
63 optreset = 0;
64 place = nargv[optind];
65 if (optind >= nargc || *place++ != '-') {
66 /* Argument is absent or is not an option */
67 place = EMSG;
68 return (-1);
69 }
70 optopt = *place++;
71 if (optopt == '-' && *place == 0) {
72 /* "--" => end of options */
73 ++optind;
74 place = EMSG;
75 return (-1);
76 }
77 if (optopt == 0) {
78 /* Solitary '-', treat as a '-' option
79 if the program (eg su) is looking for it. */
80 place = EMSG;
81 if (strchr(ostr, '-') == NULL)
82 return (-1);
83 optopt = '-';
84 }
85 } else
86 optopt = *place++;
87
88 /* See if option letter is one the caller wanted... */
89 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
90 if (*place == 0)
91 ++optind;
92 if (opterr && *ostr != ':')
93 (void)fprintf(stderr,
94 "%s: illegal option -- %c\n", _getprogname(),
95 optopt);
96 return (BADCH);
97 }
98
99 /* Does this option need an argument? */
100 if (oli[1] != ':') {
101 /* don't need argument */
102 optarg = NULL;
103 if (*place == 0)
104 ++optind;
105 } else {
106 /* Option-argument is either the rest of this argument or the
107 entire next argument. */
108 if (*place)
109 optarg = place;
110 else if (oli[2] == ':')
111 /*
112 * GNU Extension, for optional arguments if the rest of
113 * the argument is empty, we return NULL
114 */
115 optarg = NULL;
116 else if (nargc > ++optind)
117 optarg = nargv[optind];
118 else {
119 /* option-argument absent */
120 place = EMSG;
121 if (*ostr == ':')
122 return (BADARG);
123 if (opterr)
124 (void)fprintf(stderr,
125 "%s: option requires an argument -- %c\n",
126 _getprogname(), optopt);
127 return (BADCH);
128 }
129 place = EMSG;
130 ++optind;
131 }
132 return (optopt); /* return option letter */
133 }
134