basename.c revision 1.6 
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#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1991, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41/*static char sccsid[] = "from: @(#)basename.c	8.3 (Berkeley) 4/2/94";*/
42static char rcsid[] = "$Id: basename.c,v 1.6 1994/09/26 01:57:09 glass Exp $";
43#endif /* not lint */
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <locale.h>
49
50void usage __P((void));
51
52int
53main(argc, argv)
54	int argc;
55	char **argv;
56{
57	char *p;
58	int ch;
59
60	setlocale(LC_ALL, "");
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	/*
75	 * (1) If string is // it is implementation defined whether steps (2)
76	 *     through (5) are skipped or processed.
77	 *
78	 * (2) If string consists entirely of slash characters, string shall
79	 *     be set to a single slash character.  In this case, skip steps
80	 *     (3) through (5).
81	 */
82	for (p = *argv;; ++p) {
83		if (!*p) {
84			if (p > *argv)
85				(void)printf("/\n");
86			else
87				(void)printf("\n");
88			exit(0);
89		}
90		if (*p != '/')
91			break;
92	}
93
94	/*
95	 * (3) If there are any trailing slash characters in string, they
96	 *     shall be removed.
97	 */
98	for (; *p; ++p);
99	while (*--p == '/');
100	*++p = '\0';
101
102	/*
103	 * (4) If there are any slash characters remaining in string, the
104	 *     prefix of string up to an including the last slash character
105	 *     in string shall be removed.
106	 */
107	while (--p >= *argv)
108		if (*p == '/')
109			break;
110	++p;
111
112	/*
113	 * (5) If the suffix operand is present, is not identical to the
114	 *     characters remaining in string, and is identical to a suffix
115	 *     of the characters remaining in string, the suffix suffix
116	 *     shall be removed from string.
117	 */
118	if (*++argv) {
119		int suffixlen, stringlen, off;
120
121		suffixlen = strlen(*argv);
122		stringlen = strlen(p);
123
124		if (suffixlen < stringlen) {
125			off = stringlen - suffixlen;
126			if (!strcmp(p + off, *argv))
127				p[off] = '\0';
128		}
129	}
130	(void)printf("%s\n", p);
131	exit(0);
132}
133
134void
135usage()
136{
137
138	(void)fprintf(stderr, "usage: basename string [suffix]\n");
139	exit(1);
140}
141