1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * 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 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #include <libgen.h>
29 #include <errno.h>
30 #include <string.h>
31 #include <sys/param.h>
32
33 int
dirname_r(const char * path,char * buffer,size_t bufflen)34 dirname_r(const char* path, char* buffer, size_t bufflen)
35 {
36 const char *endp;
37 int result, len;
38
39 /* Empty or NULL string gets treated as "." */
40 if (path == NULL || *path == '\0') {
41 path = ".";
42 len = 1;
43 goto Exit;
44 }
45
46 /* Strip trailing slashes */
47 endp = path + strlen(path) - 1;
48 while (endp > path && *endp == '/')
49 endp--;
50
51 /* Find the start of the dir */
52 while (endp > path && *endp != '/')
53 endp--;
54
55 /* Either the dir is "/" or there are no slashes */
56 if (endp == path) {
57 path = (*endp == '/') ? "/" : ".";
58 len = 1;
59 goto Exit;
60 }
61
62 do {
63 endp--;
64 } while (endp > path && *endp == '/');
65
66 len = endp - path +1;
67
68 Exit:
69 result = len;
70 if (len+1 > MAXPATHLEN) {
71 errno = ENAMETOOLONG;
72 return -1;
73 }
74 if (buffer == NULL)
75 return result;
76
77 if (len > (int)bufflen-1) {
78 len = (int)bufflen-1;
79 result = -1;
80 errno = ERANGE;
81 }
82
83 if (len >= 0) {
84 memcpy( buffer, path, len );
85 buffer[len] = 0;
86 }
87 return result;
88 }
89