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: src/lib/libc/gen/readdir.c,v 1.15 2008/05/05 14:05:23 kib Exp $"); 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 <unistd.h> 43#include "un-namespace.h" 44 45#include "libc_private.h" 46#include "telldir.h" 47 48/* 49 * get next entry in a directory. 50 */ 51struct dirent * 52_readdir_unlocked(dirp, skip) 53 DIR *dirp; 54 int skip; 55{ 56 struct dirent *dp; 57 58 for (;;) { 59 if (dirp->dd_loc >= dirp->dd_size) { 60 if (dirp->dd_flags & __DTF_READALL) 61 return (NULL); 62 dirp->dd_loc = 0; 63 } 64 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) { 65#if __DARWIN_64_BIT_INO_T 66 dirp->dd_size = __getdirentries64(dirp->dd_fd, 67 dirp->dd_buf, dirp->dd_len, &dirp->dd_td->seekoff); 68#else /* !__DARWIN_64_BIT_INO_T */ 69 dirp->dd_size = _getdirentries(dirp->dd_fd, 70 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 71#endif /* __DARWIN_64_BIT_INO_T */ 72 if (dirp->dd_size <= 0) 73 return (NULL); 74 } 75 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 76 if ((long)dp & 03L) /* bogus pointer check */ 77 return (NULL); 78 if (dp->d_reclen <= 0 || 79 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 80 return (NULL); 81 dirp->dd_loc += dp->d_reclen; 82 if (dp->d_ino == 0 && skip) 83 continue; 84 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW)) 85 continue; 86 return (dp); 87 } 88} 89 90struct dirent * 91readdir(dirp) 92 DIR *dirp; 93{ 94 struct dirent *dp; 95 96 if (__isthreaded) { 97 _pthread_mutex_lock(&dirp->dd_lock); 98 dp = _readdir_unlocked(dirp, 1); 99 _pthread_mutex_unlock(&dirp->dd_lock); 100 } 101 else 102 dp = _readdir_unlocked(dirp, 1); 103 return (dp); 104} 105 106int 107readdir_r(dirp, entry, result) 108 DIR *dirp; 109 struct dirent *entry; 110 struct dirent **result; 111{ 112 struct dirent *dp; 113 int saved_errno; 114 115 saved_errno = errno; 116 errno = 0; 117 if (__isthreaded) { 118 _pthread_mutex_lock(&dirp->dd_lock); 119 if ((dp = _readdir_unlocked(dirp, 1)) != NULL) 120 memcpy(entry, dp, _GENERIC_DIRSIZ(dp)); 121 _pthread_mutex_unlock(&dirp->dd_lock); 122 } 123 else if ((dp = _readdir_unlocked(dirp, 1)) != NULL) 124 memcpy(entry, dp, _GENERIC_DIRSIZ(dp)); 125 126 if (errno != 0) { 127 if (dp == NULL) 128 return (errno); 129 } else 130 errno = saved_errno; 131 132 if (dp != NULL) 133 *result = entry; 134 else 135 *result = NULL; 136 137 return (0); 138} 139