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Don't call getopt(3) since a) there are not switches and b) '-' is
a perfectly reasonable character to have in a pathname.

/*	$OpenBSD: basename.c,v 1.3 1997/08/17 21:25:01 millert Exp $	*/
/*	$NetBSD: basename.c,v 1.9 1995/09/02 05:29:46 jtc Exp $	*/

/*-
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1991, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
#endif
static char rcsid[] = "$OpenBSD: basename.c,v 1.3 1997/08/17 21:25:01 millert Exp $";
#endif /* not lint */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <unistd.h>

void usage __P((void));

int
main(argc, argv)
	int argc;
	char **argv;
{
	char *p;

	setlocale(LC_ALL, "");

	if (argc != 2 && argc != 3)
		usage();
	argc--;
	argv++;

	/*
	 * (1) If string is // it is implementation defined whether steps (2)
	 *     through (5) are skipped or processed.
	 *
	 * (2) If string consists entirely of slash characters, string shall
	 *     be set to a single slash character.  In this case, skip steps
	 *     (3) through (5).
	 */
	for (p = *argv;; ++p) {
		if (!*p) {
			if (p > *argv)
				(void)putchar('/');
			(void)putchar('\n');
			exit(0);
		}
		if (*p != '/')
			break;
	}

	/*
	 * (3) If there are any trailing slash characters in string, they
	 *     shall be removed.
	 */
	for (; *p; ++p)
		continue;
	while (*--p == '/')
		continue;
	*++p = '\0';

	/*
	 * (4) If there are any slash characters remaining in string, the
	 *     prefix of string up to an including the last slash character
	 *     in string shall be removed.
	 */
	while (--p >= *argv)
		if (*p == '/')
			break;
	++p;

	/*
	 * (5) If the suffix operand is present, is not identical to the
	 *     characters remaining in string, and is identical to a suffix
	 *     of the characters remaining in string, the suffix suffix
	 *     shall be removed from string.
	 */
	if (*++argv) {
		int suffixlen, stringlen, off;

		suffixlen = strlen(*argv);
		stringlen = strlen(p);

		if (suffixlen < stringlen) {
			off = stringlen - suffixlen;
			if (!strcmp(p + off, *argv))
				p[off] = '\0';
		}
	}
	(void)puts(p);
	exit(0);
}

void
usage()
{

	(void)fprintf(stderr, "usage: basename string [suffix]\n");
	exit(1);
}