basename.c revision 65508 
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 * $FreeBSD: head/usr.bin/basename/basename.c 65508 2000-09-06 07:28:02Z des $
34 */
35
36#ifndef lint
37static const char copyright[] =
38"@(#) Copyright (c) 1991, 1993, 1994\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif /* not lint */
41
42#ifndef lint
43static const char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
44#endif /* not lint */
45
46#include <err.h>
47#include <libgen.h>
48#include <stdio.h>
49#include <string.h>
50#include <unistd.h>
51
52void usage __P((void));
53
54int
55main(argc, argv)
56	int argc;
57	char **argv;
58{
59	char *p, *q;
60	int ch;
61
62	while ((ch = getopt(argc, argv, "")) != -1)
63		switch(ch) {
64		case '?':
65		default:
66			usage();
67		}
68	argc -= optind;
69	argv += optind;
70
71	if (argc != 1 && argc != 2)
72		usage();
73
74	if ((p = basename(argv[0])) == NULL)
75		err(1, "%s", argv[0]);
76	if (*++argv && (q = strstr(p, *argv)) && strcmp(q, *argv) == 0)
77		*q = '\0';
78	(void)printf("%s\n", p);
79	exit(0);
80}
81
82void
83usage()
84{
85
86	(void)fprintf(stderr, "usage: basename string [suffix]\n");
87	exit(1);
88}
89