xref: /netbsd/lib/libc/gen/basename.c (revision c4a72b64)
1 /*	$NetBSD: basename.c,v 1.5 2002/10/17 02:06:04 thorpej Exp $	*/
2 
3 /*-
4  * Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Klaus Klein and Jason R. Thorpe.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *        This product includes software developed by the NetBSD
21  *        Foundation, Inc. and its contributors.
22  * 4. Neither the name of The NetBSD Foundation nor the names of its
23  *    contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36  * POSSIBILITY OF SUCH DAMAGE.
37  */
38 
39 #include <sys/cdefs.h>
40 #if defined(LIBC_SCCS) && !defined(lint)
41 __RCSID("$NetBSD: basename.c,v 1.5 2002/10/17 02:06:04 thorpej Exp $");
42 #endif /* !LIBC_SCCS && !lint */
43 
44 #include "namespace.h"
45 #include <libgen.h>
46 #include <limits.h>
47 #include <string.h>
48 
49 #ifdef __weak_alias
50 __weak_alias(basename,_basename)
51 #endif
52 
53 #if !HAVE_BASENAME
54 char *
55 basename(path)
56 	char *path;
57 {
58 	static char singledot[] = ".";
59 	static char result[PATH_MAX];
60 	char *p, *lastp;
61 	size_t len;
62 
63 	/*
64 	 * If `path' is a null pointer or points to an empty string,
65 	 * return a pointer to the string ".".
66 	 */
67 	if ((path == NULL) || (*path == '\0'))
68 		return (singledot);
69 
70 	/* Strip trailing slashes, if any. */
71 	lastp = path + strlen(path) - 1;
72 	while (lastp != path && *lastp == '/')
73 		lastp--;
74 
75 	/* Now find the beginning of this (final) component. */
76 	p = lastp;
77 	while (p != path && *(p - 1) != '/')
78 		p--;
79 
80 	/* ...and copy the result into the result buffer. */
81 	len = (lastp - p) + 1 /* last char */;
82 	if (len > (PATH_MAX - 1))
83 		len = PATH_MAX - 1;
84 
85 	memcpy(result, p, len);
86 	result[len] = '\0';
87 
88 	return (result);
89 }
90 #endif
91