basename.c revision 87258 
1/*-
2 * Copyright (c) 1991, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/basename/basename.c 87258 2001-12-03 01:15:28Z markm $");
37
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1991, 1993, 1994\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif
43
44#ifndef lint
45static const char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
46#endif /* not lint */
47
48#include <err.h>
49#include <libgen.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54
55int main __P((int, char **));
56void usage __P((void));
57
58int
59main(argc, argv)
60	int argc;
61	char **argv;
62{
63	char *p, *q;
64	int ch;
65
66	while ((ch = getopt(argc, argv, "")) != -1)
67		switch(ch) {
68		case '?':
69		default:
70			usage();
71		}
72	argc -= optind;
73	argv += optind;
74
75	if (argc != 1 && argc != 2)
76		usage();
77
78	if (!*argv[0]) {
79		printf("\n");
80		exit(0);
81	}
82	if ((p = basename(argv[0])) == NULL)
83		err(1, "%s", argv[0]);
84	if (*++argv && (q = strchr(p, '\0') - strlen(*argv)) > p &&
85	    strcmp(*argv, q) == 0)
86			*q = '\0';
87	(void)printf("%s\n", p);
88	exit(0);
89}
90
91void
92usage()
93{
94
95	(void)fprintf(stderr, "usage: basename string [suffix]\n");
96	exit(1);
97}
98