1/*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. 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 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/lib/libc/gen/readdir.c 174221 2007-12-03 14:33:51Z des $");
35
36#include "namespace.h"
37#include <sys/param.h>
38#include <dirent.h>
39#include <errno.h>
40#include <string.h>
41#include <pthread.h>
42#include "un-namespace.h"
43
44#include "libc_private.h"
45#include "telldir.h"
46
47/*
48 * get next entry in a directory.
49 */
50struct dirent *
51_readdir_unlocked(dirp)
52 DIR *dirp;
53{
54 struct dirent *dp;
55
56 for (;;) {
57 if (dirp->dd_loc >= dirp->dd_size) {
58 if (dirp->dd_flags & __DTF_READALL)
59 return (NULL);
60 dirp->dd_loc = 0;
61 }
62 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
63 dirp->dd_size = _getdirentries(dirp->dd_fd,
64 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
65 if (dirp->dd_size <= 0)
66 return (NULL);
67 }
68 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
69 if ((long)dp & 03L) /* bogus pointer check */
70 return (NULL);
71 if (dp->d_reclen <= 0 ||
72 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
73 return (NULL);
74 dirp->dd_loc += dp->d_reclen;
75 if (dp->d_ino == 0)
76 continue;
77 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
78 continue;
79 return (dp);
80 }
81}
82
83struct dirent *
84readdir(dirp)
85 DIR *dirp;
86{
87 struct dirent *dp;
88
89 if (__isthreaded) {
90 _pthread_mutex_lock(&dirp->dd_lock);
91 dp = _readdir_unlocked(dirp);
92 _pthread_mutex_unlock(&dirp->dd_lock);
93 }
94 else
95 dp = _readdir_unlocked(dirp);
96 return (dp);
97}
98
99int
100readdir_r(dirp, entry, result)
101 DIR *dirp;
102 struct dirent *entry;
103 struct dirent **result;
104{
105 struct dirent *dp;
106 int saved_errno;
107
108 saved_errno = errno;
109 errno = 0;
110 if (__isthreaded) {
111 _pthread_mutex_lock(&dirp->dd_lock);
112 if ((dp = _readdir_unlocked(dirp)) != NULL)
113 memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
114 _pthread_mutex_unlock(&dirp->dd_lock);
115 }
116 else if ((dp = _readdir_unlocked(dirp)) != NULL)
117 memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
118
119 if (errno != 0) {
120 if (dp == NULL)
121 return (errno);
122 } else
123 errno = saved_errno;
124
125 if (dp != NULL)
126 *result = entry;
127 else
128 *result = NULL;
129
130 return (0);
131}
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. 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 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/lib/libc/gen/readdir.c 174221 2007-12-03 14:33:51Z des $");
35
36#include "namespace.h"
37#include <sys/param.h>
38#include <dirent.h>
39#include <errno.h>
40#include <string.h>
41#include <pthread.h>
42#include "un-namespace.h"
43
44#include "libc_private.h"
45#include "telldir.h"
46
47/*
48 * get next entry in a directory.
49 */
50struct dirent *
51_readdir_unlocked(dirp)
52 DIR *dirp;
53{
54 struct dirent *dp;
55
56 for (;;) {
57 if (dirp->dd_loc >= dirp->dd_size) {
58 if (dirp->dd_flags & __DTF_READALL)
59 return (NULL);
60 dirp->dd_loc = 0;
61 }
62 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
63 dirp->dd_size = _getdirentries(dirp->dd_fd,
64 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
65 if (dirp->dd_size <= 0)
66 return (NULL);
67 }
68 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
69 if ((long)dp & 03L) /* bogus pointer check */
70 return (NULL);
71 if (dp->d_reclen <= 0 ||
72 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
73 return (NULL);
74 dirp->dd_loc += dp->d_reclen;
75 if (dp->d_ino == 0)
76 continue;
77 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
78 continue;
79 return (dp);
80 }
81}
82
83struct dirent *
84readdir(dirp)
85 DIR *dirp;
86{
87 struct dirent *dp;
88
89 if (__isthreaded) {
90 _pthread_mutex_lock(&dirp->dd_lock);
91 dp = _readdir_unlocked(dirp);
92 _pthread_mutex_unlock(&dirp->dd_lock);
93 }
94 else
95 dp = _readdir_unlocked(dirp);
96 return (dp);
97}
98
99int
100readdir_r(dirp, entry, result)
101 DIR *dirp;
102 struct dirent *entry;
103 struct dirent **result;
104{
105 struct dirent *dp;
106 int saved_errno;
107
108 saved_errno = errno;
109 errno = 0;
110 if (__isthreaded) {
111 _pthread_mutex_lock(&dirp->dd_lock);
112 if ((dp = _readdir_unlocked(dirp)) != NULL)
113 memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
114 _pthread_mutex_unlock(&dirp->dd_lock);
115 }
116 else if ((dp = _readdir_unlocked(dirp)) != NULL)
117 memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
118
119 if (errno != 0) {
120 if (dp == NULL)
121 return (errno);
122 } else
123 errno = saved_errno;
124
125 if (dp != NULL)
126 *result = entry;
127 else
128 *result = NULL;
129
130 return (0);
131}