1 /* $NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $ */
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34 #include "namespace.h"
39 #include "un-namespace.h"
41 #include "libc_private.h"
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 */
49 #define BADCH (int)'?'
50 #define BADARG (int)':'
51 static char EMSG[] = "";
54 * Parse argc/argv argument vector.
57 getopt(int nargc, char * const nargv[], const char *ostr)
59 static char *place = EMSG; /* option letter processing */
60 char *oli; /* option letter list index */
62 if (optreset || *place == 0) { /* update scanning pointer */
64 place = nargv[optind];
65 if (optind >= nargc || *place++ != '-') {
66 /* Argument is absent or is not an option */
71 if (optopt == '-' && *place == 0) {
72 /* "--" => end of options */
78 /* Solitary '-', treat as a '-' option
79 if the program (eg su) is looking for it. */
81 if (strchr(ostr, '-') == NULL)
88 /* See if option letter is one the caller wanted... */
89 if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
92 if (opterr && *ostr != ':')
94 "%s: illegal option -- %c\n", _getprogname(),
99 /* Does this option need an argument? */
101 /* don't need argument */
106 /* Option-argument is either the rest of this argument or the
107 entire next argument. */
110 else if (oli[2] == ':')
112 * GNU Extension, for optional arguments if the rest of
113 * the argument is empty, we return NULL
116 else if (nargc > ++optind)
117 optarg = nargv[optind];
119 /* option-argument absent */
124 (void)fprintf(stderr,
125 "%s: option requires an argument -- %c\n",
126 _getprogname(), optopt);
132 return (optopt); /* return option letter */