/*      $OpenBSD: basename.c,v 1.14 2016/10/28 07:22:59 schwarze 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. 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 <err.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static void __dead usage(void);

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

        if (pledge("stdio", NULL) == -1)
                err(1, "pledge");

        while ((ch = getopt(argc, argv, "")) != -1) {
                switch (ch) {
                default:
                        usage();
                }
        }
        argc -= optind;
        argv += optind;

        if (argc != 1 && argc != 2)
                usage();

        if (**argv == '\0') {
                (void)puts("");
                return 0;
        }
        p = basename(*argv);
        if (p == NULL)
                err(1, "%s", *argv);
        /*
         * 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) {
                size_t 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);
        return 0;
}

extern char *__progname;

static void __dead
usage(void)
{

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