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33 * @(#)getopt.c 8.1 (Berkeley) 6/4/93
44 * get option letter from argument vector
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)':'
57 getopt(nargc, nargv, ostr)
62 static char *place = EMSG; /* option letter processing */
63 char *oli; /* option letter list index */
66 if (optreset || !*place) { /* update scanning pointer */
68 if (optind >= nargc || *(place = nargv[optind]) != '-') {
72 if (place[1] && *++place == '-') { /* found "--" */
77 } /* option letter okay? */
78 if ((optopt = (int)*place++) == (int)':' ||
79 !(oli = strchr(ostr, optopt))) {
81 * if the user didn't specify '-' as an option,
82 * assume it means -1 (EOF).
84 if (optopt == (int)'-')
88 if (opterr && *ostr != ':') {
89 if (!(p = strrchr(*nargv, '/')))
93 fprintf(stderr, "%s: illegal option -- %c\n",
98 if (*++oli != ':') { /* don't need argument */
103 else { /* need an argument */
104 if (*place) /* no white space */
106 else if (nargc <= ++optind) { /* no arg */
108 if (!(p = strrchr(*nargv, '/')))
116 "%s: option requires an argument -- %c\n",
120 else /* white space */
121 optarg = nargv[optind];
125 return(optopt); /* dump back option letter */