1 /* $NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $ */
4 * SPDX-License-Identifier: BSD-3-Clause
6 * Copyright (c) 1987, 1993, 1994
7 * The Regents of the University of California. All rights reserved.
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10 * modification, are permitted provided that the following conditions
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13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
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17 * 3. Neither the name of the University nor the names of its contributors
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19 * without specific prior written permission.
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
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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("$FreeBSD$");
40 #include "namespace.h"
45 #include "un-namespace.h"
47 #include "libc_private.h"
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 */
55 #define BADCH (int)'?'
56 #define BADARG (int)':'
61 * Parse argc/argv argument vector.
64 getopt(int nargc, char * const nargv[], const char *ostr)
66 static char *place = EMSG; /* option letter processing */
67 char *oli; /* option letter list index */
69 if (optreset || *place == 0) { /* update scanning pointer */
71 place = nargv[optind];
72 if (optind >= nargc || *place++ != '-') {
73 /* Argument is absent or is not an option */
78 if (optopt == '-' && *place == 0) {
79 /* "--" => end of options */
85 /* Solitary '-', treat as a '-' option
86 if the program (eg su) is looking for it. */
88 if (strchr(ostr, '-') == NULL)
95 /* See if option letter is one the caller wanted... */
96 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
99 if (opterr && *ostr != ':')
100 (void)fprintf(stderr,
101 "%s: illegal option -- %c\n", _getprogname(),
106 /* Does this option need an argument? */
108 /* don't need argument */
113 /* Option-argument is either the rest of this argument or the
114 entire next argument. */
117 else if (oli[2] == ':')
119 * GNU Extension, for optional arguments if the rest of
120 * the argument is empty, we return NULL
123 else if (nargc > ++optind)
124 optarg = nargv[optind];
126 /* option-argument absent */
131 (void)fprintf(stderr,
132 "%s: option requires an argument -- %c\n",
133 _getprogname(), optopt);
139 return (optopt); /* return option letter */