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    Length: 1521 (0x5f1)
    Types: TextFile
    Names: »getopt.c«

└─⟦b20c6495f⟧ Bits:30007238 EUUGD18: Wien-båndet, efterår 1987
    └─⟦this⟧ »EUUGD18/General/Sonnet/getopt.c« 

TextFile

/*
**  Return options and their values from the command line.
**  This comes from the AT&T public-domain getopt published in mod.sources.
*/
#include <stdio.h>

/* Pick one */
#define IDX	index		/* .. */
/*#define IDX	strchr		/* .. */

#define TYPE	int

#define ERR(s, c)					\
    if (opterr) {					\
	char buff[2];					\
	buff[0] = c; buff[1] = '\n';			\
	(void)write(2, av[0], (TYPE)strlen(av[0]));	\
	(void)write(2, s, (TYPE)strlen(s));		\
	(void)write(2, buff, 2);			\
    }

int	 opterr = 1;
int	 optind = 1;
int	 optopt;
char	*optarg;

int
getopt(ac, av, opts)
    int			 ac;
    char		*av[];
    char		*opts;
{
    static int		 i = 1;
    register char	*p;

    /* Move to next value from argv? */
    if (i == 1) {
	if (optind >= ac || av[optind][0] != '-' || av[optind][1] == '\0')
	    return EOF;
	if (strcmp(av[optind], "--") == 0) {
	    optind++;
	    return EOF;
	}
    }

    /* Get next option character. */
    if ((optopt = av[optind][i]) == ':' || (p = IDX(opts,  optopt)) == NULL) {
	ERR(": illegal option -- ", optopt);
	if (av[optind][++i] == '\0') {
	    optind++;
	    i = 1;
	}
	return '?';
    }

    /* Snarf argument? */
    if (*++p == ':') {
	if (av[optind][i + 1] != '\0')
	    optarg = &av[optind++][i + 1];
	else {
	    if (++optind >= ac) {
		ERR(": option requires an argument -- ", optopt);
		i = 1;
		return '?';
	    }
	    optarg = av[optind++];
	}
	i = 1;
    }
    else {
	if (av[optind][++i] == '\0') {
	    i = 1;
	    optind++;
	}
	optarg = NULL;
    }

    return optopt;
}