getopt.h File Reference

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Functions
int	getopt (int argc, char *const *argv, const char *optstring)

Variables
int	opterr
int	optind
int	optopt
char *	optarg

Function Documentation

getopt()

int getopt	(	int	argc,
		char *const *	argv,
		const char *	optstring
	)

Definition at line 55 of file getopt.c.

{
    static const char *place = EMSG;        /* option letter processing */
    register char *oli;         /* option letter list index */
    char *p;
 
    if (!*place) {              /* update scanning pointer */
        if (optind >= nargc || *(place = nargv[optind]) != '-') {
            place = EMSG;
            return(EOF);
        }
        if (place[1] && *++place == '-') {  /* found "--" */
            ++optind;
            place = EMSG;
            return(EOF);
        }
    }                   /* option letter okay? */
    if ((optopt = (int)*place++) == (int)':' ||
        !(oli = strchr(ostr, optopt))) {
        /*
         * if the user didn't specify '-' as an option,
         * assume it means EOF.
         */
        if (optopt == (int)'-')
            return(EOF);
        if (!*place)
            ++optind;
        if (opterr) {
            if (!(p = strrchr(*nargv, '/')))
                p = *nargv;
            else
                ++p;
            (void)fprintf(stderr, "%s: illegal option -- %c\n",
                p, optopt);
        }
        return(BADCH);
    }
    if (*++oli != ':') {            /* don't need argument */
        optarg = NULL;
        if (!*place)
            ++optind;
    }
    else {                  /* need an argument */
        if (*place)         /* no white space */
            optarg = place;
        else if (nargc <= ++optind) {   /* no arg */
            place = EMSG;
            if (!(p = strrchr(*nargv, '/')))
                p = *nargv;
            else
                ++p;
            if (opterr)
                (void)fprintf(stderr,
                    "%s: option requires an argument -- %c\n",
                    p, optopt);
            return(BADCH);
        }
        else                /* white space */
            optarg = nargv[optind];
        place = EMSG;
        ++optind;
    }
    return(optopt);             /* dump back option letter */
}

Variable Documentation

optarg

char* optarg

extern

Definition at line 49 of file getopt.c.

opterr

int opterr

extern

Definition at line 46 of file getopt.c.

optind

int optind

extern

Definition at line 47 of file getopt.c.

optopt

int optopt

extern

Definition at line 48 of file getopt.c.