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- #include <stdio.h>
-
- #define index strchr
-
- /*
- * get option letter from argument vector
- */
- int opterr = 1, /* useless, never set or used */
- optind = 1, /* index into parent argv vector */
- optopt; /* character checked for validity */
- char *optarg; /* argument associated with option */
-
- #define BADCH (int)'?'
- #define EMSG ""
- #define tell(s) fputs(*nargv,stderr);fputs(s,stderr); \
- fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);
-
- getopt(nargc,nargv,ostr)
- int nargc;
- char **nargv,
- *ostr;
- {
- static char *place = EMSG; /* option letter processing */
- register char *oli; /* option letter list index */
- char *index();
-
- if(!*place) { /* update scanning pointer */
- if(optind >= nargc || *(place = nargv[optind]) != '-' || !*++place) return(EOF);
- if (*place == '-') { /* found "--" */
- ++optind;
- return(EOF);
- }
- } /* option letter okay? */
- if ((optopt = (int)*place++) == (int)':' || !(oli = index(ostr,optopt))) {
- if(!*place) ++optind;
- tell(": illegal option -- ");
- }
- if (*++oli != ':') { /* don't need argument */
- optarg = NULL;
- if (!*place) ++optind;
- }
- else { /* need an argument */
- if (*place) optarg = place; /* no white space */
- else if (nargc <= ++optind) { /* no arg */
- place = EMSG;
- tell(": option requires an argument -- ");
- }
- else optarg = nargv[optind]; /* white space */
- place = EMSG;
- ++optind;
- }
- return(optopt); /* dump back option letter */
- }
-
-
-
-