1 /** @file
2 Get next entry in a directory.
3
4 Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 Copyright (c) 1983, 1993
14 The Regents of the University of California. All rights reserved.
15
16 Redistribution and use in source and binary forms, with or without
17 modification, are permitted provided that the following conditions
18 are met:
19 1. Redistributions of source code must retain the above copyright
20 notice, this list of conditions and the following disclaimer.
21 2. Redistributions in binary form must reproduce the above copyright
22 notice, this list of conditions and the following disclaimer in the
23 documentation and/or other materials provided with the distribution.
24 3. Neither the name of the University nor the names of its contributors
25 may be used to endorse or promote products derived from this software
26 without specific prior written permission.
27
28 THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 SUCH DAMAGE.
39
40 NetBSD: readdir.c,v 1.24 2008/05/04 18:53:26 tonnerre Exp
41 readdir.c 8.3 (Berkeley) 9/29/94
42 */
43 #include <sys/cdefs.h>
44
45 #include <namespace.h>
46 #include <reentrant.h>
47 #include <extern.h>
48 #include <sys/param.h>
49 #include <sys/stdint.h>
50
51 #include <stdio.h>
52 #include <dirent.h>
53 #include <errno.h>
54 #include <string.h>
55 #include <unistd.h>
56
57 /*
58 * get next entry in a directory.
59 */
60 struct dirent *
_readdir_unlocked(DIR * dirp,int skipdeleted)61 _readdir_unlocked(DIR *dirp, int skipdeleted)
62 {
63 struct dirent *dp;
64
65
66 for (;;) {
67 if (dirp->dd_loc >= dirp->dd_size) {
68 if (dirp->dd_flags & __DTF_READALL)
69 return (NULL);
70 dirp->dd_loc = 0;
71 }
72 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
73 dirp->dd_size = (long)read(dirp->dd_fd, dirp->dd_buf, (size_t)dirp->dd_len);
74 if (dirp->dd_size <= 0)
75 return (NULL);
76 }
77 dp = (struct dirent *) (void *)(dirp->dd_buf + (size_t)dirp->dd_loc);
78 if ((intptr_t)dp & _DIRENT_ALIGN(dp))/* bogus pointer check */
79 return (NULL);
80 dirp->dd_loc += (long)dp->Size;
81 if ((dp->Attribute & DT_HIDDEN) && (dirp->dd_flags & DTF_HIDEW))
82 continue;
83 return (dp);
84 }
85 }
86
87 struct dirent *
readdir(DIR * dirp)88 readdir(DIR *dirp)
89 {
90 struct dirent *dp;
91
92 #ifdef _REENTRANT
93 if (__isthreaded) {
94 mutex_lock((mutex_t *)dirp->dd_lock);
95 dp = _readdir_unlocked(dirp, 1);
96 mutex_unlock((mutex_t *)dirp->dd_lock);
97 }
98 else
99 #endif
100 dp = _readdir_unlocked(dirp, 1);
101 return (dp);
102 }
103
104 int
readdir_r(DIR * dirp,struct dirent * entry,struct dirent ** result)105 readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result)
106 {
107 struct dirent *dp;
108 int saved_errno;
109
110 saved_errno = errno;
111 errno = 0;
112 #ifdef _REENTRANT
113 if (__isthreaded) {
114 mutex_lock((mutex_t *)dirp->dd_lock);
115 if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
116 memcpy(entry, dp, (size_t)_DIRENT_SIZE(dp));
117 mutex_unlock((mutex_t *)dirp->dd_lock);
118 }
119 else
120 #endif
121 if ((dp = _readdir_unlocked(dirp, 1)) != NULL)
122 memcpy(entry, dp, (size_t)_DIRENT_SIZE(dp));
123
124 if (errno != 0) {
125 if (dp == NULL)
126 return (errno);
127 } else
128 errno = saved_errno;
129
130 if (dp != NULL)
131 *result = entry;
132 else
133 *result = NULL;
134
135 return (0);
136 }
137