michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: /*
michael@0:  * Copyright (c) 1987 Regents of the University of California.
michael@0:  * All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms are permitted
michael@0:  * provided that: (1) source distributions retain this entire copyright
michael@0:  * notice and comment, and (2) distributions including binaries display
michael@0:  * the following acknowledgement:  ``This product includes software
michael@0:  * developed by the University of California, Berkeley and its contributors''
michael@0:  * in the documentation or other materials provided with the distribution
michael@0:  * and in all advertising materials mentioning features or use of this
michael@0:  * software. Neither the name of the University nor the names of its
michael@0:  * contributors may be used to endorse or promote products derived
michael@0:  * from this software without specific prior written permission.
michael@0:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
michael@0:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
michael@0:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
michael@0:  */
michael@0: 
michael@0: #if defined(LIBC_SCCS) && !defined(lint)
michael@0: static char sccsid[] = "@(#)getopt.c    4.12 (Berkeley) 6/1/90";
michael@0: #endif /* LIBC_SCCS and not lint */
michael@0: 
michael@0: #include <stdio.h>
michael@0: #include <string.h>
michael@0: #define index strchr
michael@0: #define rindex strrchr
michael@0: 
michael@0: /*
michael@0:  * get option letter from argument vector
michael@0:  */
michael@0: int     opterr = 1,             /* if error message should be printed */
michael@0: 	optind = 1,             /* index into parent argv vector */
michael@0: 	optopt;                 /* character checked for validity */
michael@0: char    *optarg;                /* argument associated with option */
michael@0: 
michael@0: #define BADCH   (int)'?'
michael@0: #define EMSG    ""
michael@0: 
michael@0: int getopt(int nargc, char **nargv, char *ostr)
michael@0: {
michael@0: 	static char *place = EMSG;              /* option letter processing */
michael@0: 	register char *oli;                     /* option letter list index */
michael@0: 	char *p;
michael@0: 
michael@0: 	if (!*place) {                          /* update scanning pointer */
michael@0: 		if (optind >= nargc || *(place = nargv[optind]) != '-') {
michael@0: 			place = EMSG;
michael@0: 			return(EOF);
michael@0: 		}
michael@0: 		if (place[1] && *++place == '-') {      /* found "--" */
michael@0: 			++optind;
michael@0: 			place = EMSG;
michael@0: 			return(EOF);
michael@0: 		}
michael@0: 	}                                       /* option letter okay? */
michael@0: 	if ((optopt = (int)*place++) == (int)':' ||
michael@0: 	    !(oli = index(ostr, optopt))) {
michael@0: 		/*
michael@0: 		 * if the user didn't specify '-' as an option,
michael@0: 		 * assume it means EOF.
michael@0: 		 */
michael@0: 		if (optopt == (int)'-')
michael@0: 			return(EOF);
michael@0: 		if (!*place)
michael@0: 			++optind;
michael@0: 		if (opterr) {
michael@0: 			if (!(p = rindex(*nargv, '/')))
michael@0: 				p = *nargv;
michael@0: 			else
michael@0: 				++p;
michael@0: 			(void)fprintf(stderr, "%s: illegal option -- %c\n",
michael@0: 			    p, optopt);
michael@0: 		}
michael@0: 		return(BADCH);
michael@0: 	}
michael@0: 	if (*++oli != ':') {                    /* don't need argument */
michael@0: 		optarg = NULL;
michael@0: 		if (!*place)
michael@0: 			++optind;
michael@0: 	}
michael@0: 	else {                                  /* need an argument */
michael@0: 		if (*place)                     /* no white space */
michael@0: 			optarg = place;
michael@0: 		else if (nargc <= ++optind) {   /* no arg */
michael@0: 			place = EMSG;
michael@0: 			if (!(p = rindex(*nargv, '/')))
michael@0: 				p = *nargv;
michael@0: 			else
michael@0: 				++p;
michael@0: 			if (opterr)
michael@0: 				(void)fprintf(stderr,
michael@0: 				    "%s: option requires an argument -- %c\n",
michael@0: 				    p, optopt);
michael@0: 			return(BADCH);
michael@0: 		}
michael@0: 		else                            /* white space */
michael@0: 			optarg = nargv[optind];
michael@0: 		place = EMSG;
michael@0: 		++optind;
michael@0: 	}
michael@0: 	return(optopt);                         /* dump back option letter */
michael@0: }