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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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: src/lib/libc/gen/readdir.c,v 1.11 2002/02/26 21:39:32 alfred Exp $");
39
40#include "namespace.h"
41#include <sys/param.h>
42#include <dirent.h>
43#include <errno.h>
44#include <string.h>
45#include <pthread.h>
46#include <unistd.h>
47#include "un-namespace.h"
48
49#include "telldir.h"
50#include "libc_private.h"
51
52/*
53 * get next entry in a directory.
54 */
55struct dirent *
56_readdir_unlocked(dirp)
57 DIR *dirp;
58{
59 struct dirent *dp;
60
61 for (;;) {
62 if (dirp->dd_loc >= dirp->dd_size) {
63 if (dirp->dd_flags & __DTF_READALL)
64 return (NULL);
65 dirp->dd_loc = 0;
66 }
67 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
68#if __DARWIN_64_BIT_INO_T
69 dirp->dd_size = __getdirentries64(dirp->dd_fd,
70 dirp->dd_buf, dirp->dd_len, &dirp->dd_td->seekoff);
71#else /* !__DARWIN_64_BIT_INO_T */
72 dirp->dd_size = _getdirentries(dirp->dd_fd,
73 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
74#endif /* __DARWIN_64_BIT_INO_T */
75 if (dirp->dd_size <= 0)
76 return (NULL);
77 }
78 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
79 if ((long)dp & 03L) /* bogus pointer check */
80 return (NULL);
81 if (dp->d_reclen <= 0 ||
82 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
83 return (NULL);
84 dirp->dd_loc += dp->d_reclen;
85 if (dp->d_ino == 0)
86 continue;
87 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
88 continue;
89 return (dp);
90 }
91}
92
93struct dirent *
94readdir(dirp)
95 DIR *dirp;
96{
97 struct dirent *dp;
98
99 if (__isthreaded) {
100 _pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
101 dp = _readdir_unlocked(dirp);
102 _pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
103 }
104 else
105 dp = _readdir_unlocked(dirp);
106 return (dp);
107}
108
109int
110readdir_r(dirp, entry, result)
111 DIR *dirp;
112 struct dirent *entry;
113 struct dirent **result;
114{
115 struct dirent *dp;
116 int saved_errno;
117
118 saved_errno = errno;
119 errno = 0;
120 if (__isthreaded) {
121 _pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
122 if ((dp = _readdir_unlocked(dirp)) != NULL)
123 memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
124 _pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
125 }
126 else if ((dp = _readdir_unlocked(dirp)) != NULL)
127 memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
128
129 if (errno != 0) {
130 if (dp == NULL)
131 return (errno);
132 } else
133 errno = saved_errno;
134
135 if (dp != NULL)
136 *result = entry;
137 else
138 *result = NULL;
139
140 return (0);
141}