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
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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 "namespace.h"
42 #include "un-namespace.h"
44 #include "libc_private.h"
46 int opterr = 1, /* if error message should be printed */
47 optind = 1, /* index into parent argv vector */
48 optopt, /* character checked for validity */
49 optreset; /* reset getopt */
50 char *optarg; /* argument associated with option */
52 #define BADCH (int)'?'
53 #define BADARG (int)':'
54 static char EMSG[] = "";
57 * Parse argc/argv argument vector.
60 getopt(int nargc, char * const nargv[], const char *ostr)
62 static char *place = EMSG; /* option letter processing */
63 char *oli; /* option letter list index */
65 if (optreset || *place == 0) { /* update scanning pointer */
67 place = nargv[optind];
68 if (optind >= nargc || *place++ != '-') {
69 /* Argument is absent or is not an option */
74 if (optopt == '-' && *place == 0) {
75 /* "--" => end of options */
81 /* Solitary '-', treat as a '-' option
82 if the program (eg su) is looking for it. */
84 if (strchr(ostr, '-') == NULL)
91 /* See if option letter is one the caller wanted... */
92 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
95 if (opterr && *ostr != ':')
97 "%s: illegal option -- %c\n", _getprogname(),
102 /* Does this option need an argument? */
104 /* don't need argument */
109 /* Option-argument is either the rest of this argument or the
110 entire next argument. */
113 else if (oli[2] == ':')
115 * GNU Extension, for optional arguments if the rest of
116 * the argument is empty, we return NULL
119 else if (nargc > ++optind)
120 optarg = nargv[optind];
122 /* option-argument absent */
127 (void)fprintf(stderr,
128 "%s: option requires an argument -- %c\n",
129 _getprogname(), optopt);
135 return (optopt); /* return option letter */