/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #ifndef _POSIX_SOURCE#include <u.h>#include <libc.h>#else#define _BSD_EXTENSION#include <stdlib.h>#include <unistd.h>#include <string.h>#endif #include	<stdio.h> #define ERR(str, chr)       if(opterr){fprintf(stderr, "%s%s%c\n", argv[0], str, chr);} int     opterr = 1;int     optind = 1;int	optopt;char    *optarg; intgetopt (argc, argv, opts)char **argv, *opts;{	static int sp = 1;	register 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;}