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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: egetopt.c,v 1.8 2009/10/27 23:59:41 deraadt Exp $	*/

/*-
 * Copyright (c) 1991 Keith Muller.
 * Copyright (c) 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

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

#include "extern.h"

/*
 * egetopt:	get option letter from argument vector (an extended
 *		version of getopt).
 *
 * Non standard additions to the ostr specs are:
 * 1) '?': immediate value following arg is optional (no white space
 *    between the arg and the value)
 * 2) '#': +/- followed by a number (with an optional sign but
 *    no white space between the arg and the number). The - may be
 *    combined with other options, but the + cannot.
 */

int	eopterr = 1;		/* if error message should be printed */
int	eoptind = 1;		/* index into parent argv vector */
int	eoptopt;		/* character checked for validity */
char	*eoptarg;		/* argument associated with option */

#define	BADCH	(int)'?'
#define	EMSG	""

int
egetopt(int nargc, char * const *nargv, const char *ostr)
{
	static char *place = EMSG;	/* option letter processing */
	char *oli;			/* option letter list index */
	static int delim;		/* which option delimiter */
	char *p;
	static char savec = '\0';

	if (savec != '\0') {
		*place = savec;
		savec = '\0';
	}

	if (!*place) {
		/*
		 * update scanning pointer
		 */
		if ((eoptind >= nargc) ||
		    ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
			place = EMSG;
			return (-1);
		}

		delim = (int)*place;
		if (place[1] && *++place == '-' && !place[1]) {
			/*
			 * found "--"
			 */
			++eoptind;
			place = EMSG;
			return (-1);
		}
	}

	/*
	 * check option letter
	 */
	if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
	    !(oli = strchr(ostr, eoptopt))) {
		/*
		 * if the user didn't specify '-' as an option,
		 * assume it means EOF when by itself.
		 */
		if ((eoptopt == (int)'-') && !*place)
			return (-1);
		if (strchr(ostr, '#') && (isdigit(eoptopt) ||
		    (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
		      isdigit(*place)))) {
			/*
			 * # option: +/- with a number is ok
			 */
			for (p = place; *p != '\0'; ++p) {
				if (!isdigit(*p))
					break;
			}
			eoptarg = place-1;

			if (*p == '\0') {
				place = EMSG;
				++eoptind;
			} else {
				place = p;
				savec = *p;
				*place = '\0';
			}
			return (delim);
		}

		if (!*place)
			++eoptind;
		if (eopterr) {
			if (!(p = strrchr(*nargv, '/')))
				p = *nargv;
			else
				++p;
			(void)fprintf(stderr, "%s: illegal option -- %c\n",
			    p, eoptopt);
		}
		return (BADCH);
	}
	if (delim == (int)'+') {
		/*
		 * '+' is only allowed with numbers
		 */
		if (!*place)
			++eoptind;
		if (eopterr) {
			if (!(p = strrchr(*nargv, '/')))
				p = *nargv;
			else
				++p;
			(void)fprintf(stderr,
				"%s: illegal '+' delimiter with option -- %c\n",
				p, eoptopt);
		}
		return (BADCH);
	}
	++oli;
	if ((*oli != ':') && (*oli != '?')) {
		/*
		 * don't need argument
		 */
		eoptarg = NULL;
		if (!*place)
			++eoptind;
		return (eoptopt);
	}

	if (*place) {
		/*
		 * no white space
		 */
		eoptarg = place;
	} else if (*oli == '?') {
		/*
		 * no arg, but NOT required
		 */
		eoptarg = NULL;
	} else if (nargc <= ++eoptind) {
		/*
		 * no arg, but IS required
		 */
		place = EMSG;
		if (eopterr) {
			if (!(p = strrchr(*nargv, '/')))
				p = *nargv;
			else
				++p;
			(void)fprintf(stderr,
			    "%s: option requires an argument -- %c\n", p,
			    eoptopt);
		}
		return (BADCH);
	} else {
		/*
		 * arg has white space
		 */
		eoptarg = nargv[eoptind];
	}
	place = EMSG;
	++eoptind;
	return (eoptopt);
}