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      1 /*	$NetBSD: basename.c,v 1.16 2019/02/01 08:29:04 mrg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\
     35  The Regents of the University of California.  All rights reserved.");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
     41 #endif
     42 __RCSID("$NetBSD: basename.c,v 1.16 2019/02/01 08:29:04 mrg Exp $");
     43 #endif /* not lint */
     44 
     45 #include <err.h>
     46 #include <libgen.h>
     47 #include <locale.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <unistd.h>
     52 
     53 __dead static void usage(void);
     54 
     55 int
     56 main(int argc, char **argv)
     57 {
     58 	char *p;
     59 	int ch;
     60 
     61 	setlocale(LC_ALL, "");
     62 
     63 	while ((ch = getopt(argc, argv, "")) != -1)
     64 		switch (ch) {
     65 		case '?':
     66 		default:
     67 			usage();
     68 		}
     69 	argc -= optind;
     70 	argv += optind;
     71 
     72 	if (argc != 1 && argc != 2)
     73 		usage();
     74 
     75 	if (**argv == '\0') {
     76 		(void)printf("\n");
     77 		exit(0);
     78 	}
     79 	if ((p = basename(*argv)) == NULL)
     80 		err(1, "%s", *argv);
     81 	if (*++argv != NULL) {
     82 		int suffixlen, stringlen, off;
     83 
     84 		suffixlen = strlen(*argv);
     85 		stringlen = strlen(p);
     86 
     87 		if (suffixlen < stringlen) {
     88 			off = stringlen - suffixlen;
     89 			if (strcmp(p + off, *argv) == 0)
     90 				p[off] = '\0';
     91 		}
     92 	}
     93 	(void)printf("%s\n", p);
     94 	exit(0);
     95 }
     96 
     97 static void
     98 usage(void)
     99 {
    100 
    101 	(void)fprintf(stderr, "usage: basename string [suffix]\n");
    102 	exit(1);
    103 }
    104