1 /* $NetBSD: basename.c,v 1.12 2023/01/18 08:07:22 simonb 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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: basename.c,v 1.12 2023/01/18 08:07:22 simonb Exp $");
35 #endif /* !LIBC_SCCS && !lint */
36
37 #include "namespace.h"
38 #include <sys/param.h>
39 #include <libgen.h>
40 #include <string.h>
41 #include <limits.h>
42 #include <string.h>
43
44 #ifdef __weak_alias
__weak_alias(basename,_basename)45 __weak_alias(basename,_basename)
46 #endif
47
48 static size_t
49 xbasename_r(const char *path, char *buf, size_t buflen)
50 {
51 const char *startp, *endp;
52 size_t len;
53
54 /*
55 * If `path' is a null pointer or points to an empty string,
56 * return a pointer to the string ".".
57 */
58 if (path == NULL || *path == '\0') {
59 startp = ".";
60 len = 1;
61 goto out;
62 }
63
64 /* Strip trailing slashes, if any. */
65 endp = path + strlen(path) - 1;
66 while (endp != path && *endp == '/')
67 endp--;
68
69 /* Only slashes -> "/" */
70 if (endp == path && *endp == '/') {
71 startp = "/";
72 len = 1;
73 goto out;
74 }
75
76 /* Now find the beginning of this (final) component. */
77 for (startp = endp; startp > path && *(startp - 1) != '/'; startp--)
78 continue;
79
80 /* ...and copy the result into the result buffer. */
81 len = (endp - startp) + 1 /* last char */;
82 out:
83 if (buf != NULL && buflen != 0) {
84 buflen = MIN(len, buflen - 1);
85 memcpy(buf, startp, buflen);
86 buf[buflen] = '\0';
87 }
88 return len;
89 }
90
91 #if !HAVE_BASENAME
92
93 char *
basename(char * path)94 basename(char *path)
95 {
96 static char result[PATH_MAX];
97
98 (void)xbasename_r(path, result, sizeof(result));
99 return result;
100 }
101
102 #endif
103