File: getopt.c

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/* ::[[ @(#) getopt.c 1.5 89/03/11 05:40:23 ]]:: */
#ifndef LINT
static const char Id[] = "$Id: getopt.c,v 1.1 2002/11/22 22:06:46 tom Exp $";
#endif

/*
 * Here's something you've all been waiting for:  the AT&T public domain
 * source for getopt(3).  It is the code which was given out at the 1985
 * UNIFORUM conference in Dallas.  I obtained it by electronic mail
 * directly from AT&T.  The people there assure me that it is indeed
 * in the public domain.
 *
 * There is no manual page.  That is because the one they gave out at
 * UNIFORUM was slightly different from the current System V Release 2
 * manual page.  The difference apparently involved a note about the
 * famous rules 5 and 6, recommending using white space between an option
 * and its first argument, and not grouping options that have arguments.
 * Getopt itself is currently lenient about both of these things White
 * space is allowed, but not mandatory, and the last option in a group can
 * have an argument.  That particular version of the man page evidently
 * has no official existence, and my source at AT&T did not send a copy.
 * The current SVR2 man page reflects the actual behavor of this getopt.
 * However, I am not about to post a copy of anything licensed by AT&T.
 */

#include <stdio.h>
#include <string.h>

#define ERR(szz,czz) if(opterr){fprintf(stderr,"%s%s%c\n",argv[0],szz,czz);}

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

int
getopt(int argc, char **argv, char *opts)
{
    static int sp = 1;
    register int c;
    register char *cp;

    if (sp == 1) {
	if (optind >= argc ||
	    argv[optind][0] != '-' || argv[optind][1] == '\0')
	    return (EOF);
	else if (strcmp(argv[optind], "--") == 0) {
	    optind++;
	    return (EOF);
	}
    }
    optopt = c = argv[optind][sp];
    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
	ERR(": illegal option -- ", c);
	if (argv[optind][++sp] == '\0') {
	    optind++;
	    sp = 1;
	}
	return ('?');
    }
    if (*++cp == ':') {
	if (argv[optind][sp + 1] != '\0')
	    optarg = &argv[optind++][sp + 1];
	else if (++optind >= argc) {
	    ERR(": option requires an argument -- ", c);
	    sp = 1;
	    return ('?');
	} else
	    optarg = argv[optind++];
	sp = 1;
    } else {
	if (argv[optind][++sp] == '\0') {
	    sp = 1;
	    optind++;
	}
	optarg = NULL;
    }
    return (c);
}