basename.c revision 1.12 
1/*	$NetBSD: basename.c,v 1.12 2005/02/17 16:57:27 xtraeme 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\n\
35	The Regents of the University of California.  All rights reserved.\n");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)basename.c	8.4 (Berkeley) 5/4/95";
41#endif
42__RCSID("$NetBSD: basename.c,v 1.12 2005/02/17 16:57:27 xtraeme Exp $");
43#endif /* not lint */
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <locale.h>
49#include <unistd.h>
50
51void usage(void);
52
53int
54main(int argc, char **argv)
55{
56	char *p;
57	int ch;
58
59	setlocale(LC_ALL, "");
60
61	while ((ch = getopt(argc, argv, "")) != -1)
62		switch(ch) {
63		case '?':
64		default:
65			usage();
66		}
67	argc -= optind;
68	argv += optind;
69
70	if (argc != 1 && argc != 2)
71		usage();
72
73	/*
74	 * (1) If string is // it is implementation defined whether steps (2)
75	 *     through (5) are skipped or processed.
76	 *
77	 * (2) If string consists entirely of slash characters, string shall
78	 *     be set to a single slash character.  In this case, skip steps
79	 *     (3) through (5).
80	 */
81	for (p = *argv;; ++p) {
82		if (!*p) {
83			if (p > *argv)
84				(void)printf("/\n");
85			else
86				(void)printf("\n");
87			exit(0);
88		}
89		if (*p != '/')
90			break;
91	}
92
93	/*
94	 * (3) If there are any trailing slash characters in string, they
95	 *     shall be removed.
96	 */
97	for (; *p; ++p)
98		continue;
99	while (*--p == '/')
100		continue;
101	*++p = '\0';
102
103	/*
104	 * (4) If there are any slash characters remaining in string, the
105	 *     prefix of string up to an including the last slash character
106	 *     in string shall be removed.
107	 */
108	while (--p >= *argv)
109		if (*p == '/')
110			break;
111	++p;
112
113	/*
114	 * (5) If the suffix operand is present, is not identical to the
115	 *     characters remaining in string, and is identical to a suffix
116	 *     of the characters remaining in string, the suffix suffix
117	 *     shall be removed from string.
118	 */
119	if (*++argv) {
120		int suffixlen, stringlen, off;
121
122		suffixlen = strlen(*argv);
123		stringlen = strlen(p);
124
125		if (suffixlen < stringlen) {
126			off = stringlen - suffixlen;
127			if (!strcmp(p + off, *argv))
128				p[off] = '\0';
129		}
130	}
131	(void)printf("%s\n", p);
132	exit(0);
133}
134
135void
136usage(void)
137{
138
139	(void)fprintf(stderr, "usage: basename string [suffix]\n");
140	exit(1);
141}
142