1 /* $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $ */
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31 * @(#)getopt.c 8.3 (Berkeley) 4/27/95
32 * $FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $
35 #include "namespace.h"
40 #include "un-namespace.h"
42 #include "libc_private.h"
44 int opterr = 1, /* if error message should be printed */
45 optind = 1, /* index into parent argv vector */
46 optopt, /* character checked for validity */
47 optreset; /* reset getopt */
48 char *optarg; /* argument associated with option */
50 #define BADCH (int)'?'
51 #define BADARG (int)':'
53 static char EMSG[] = { '\0' };
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 */
66 * Some programs like cvs expect optind = 0 to trigger
72 if (optreset || *place == 0) { /* update scanning pointer */
74 place = nargv[optind];
75 if (optind >= nargc || *place++ != '-') {
76 /* Argument is absent or is not an option */
81 if (optopt == '-' && *place == 0) {
82 /* "--" => end of options */
88 /* Solitary '-', treat as a '-' option
89 if the program (eg su) is looking for it. */
91 if (strchr(ostr, '-') == NULL)
98 /* See if option letter is one the caller wanted... */
99 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
102 if (opterr && *ostr != ':')
104 "%s: illegal option -- %c\n", _getprogname(),
109 /* Does this option need an argument? */
111 /* don't need argument */
116 /* Option-argument is either the rest of this argument or the
117 entire next argument. */
120 else if (oli[2] == ':')
122 * GNU Extension, for optional arguments if the rest of
123 * the argument is empty, we return NULL
126 else if (nargc > ++optind)
127 optarg = nargv[optind];
129 /* option-argument absent */
135 "%s: option requires an argument -- %c\n",
136 _getprogname(), optopt);
142 return (optopt); /* return option letter */