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
33int
34basename_r(const char* path, char*  buffer, size_t  bufflen)
35{
36    const char *endp, *startp;
37    int         len, result;
38    char        temp[2];
39
40    /* Empty or NULL string gets treated as "." */
41    if (path == NULL || *path == '\0') {
42        startp  = ".";
43        len     = 1;
44        goto Exit;
45    }
46
47    /* Strip trailing slashes */
48    endp = path + strlen(path) - 1;
49    while (endp > path && *endp == '/')
50        endp--;
51
52    /* All slashes becomes "/" */
53    if (endp == path && *endp == '/') {
54        startp = "/";
55        len    = 1;
56        goto Exit;
57    }
58
59    /* Find the start of the base */
60    startp = endp;
61    while (startp > path && *(startp - 1) != '/')
62        startp--;
63
64    len = endp - startp +1;
65
66Exit:
67    result = len;
68    if (buffer == NULL) {
69        return result;
70    }
71    if (len > (int)bufflen-1) {
72        len    = (int)bufflen-1;
73        result = -1;
74        errno  = ERANGE;
75    }
76
77    if (len >= 0) {
78        memcpy( buffer, startp, len );
79        buffer[len] = 0;
80    }
81    return result;
82}
83