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. 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) 31 static char rcsid[] = "$OpenBSD: readdir.c,v 1.6 2003/06/02 20:18:34 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/param.h> 35 #include <dirent.h> 36 #include <string.h> 37 #include <errno.h> 38 #include "thread_private.h" 39 40 /* 41 * get next entry in a directory. 42 */ 43 struct dirent * 44 readdir(dirp) 45 register DIR *dirp; 46 { 47 register struct dirent *dp; 48 49 for (;;) { 50 if (dirp->dd_loc >= dirp->dd_size) { 51 if (dirp->dd_flags & __DTF_READALL) 52 return (NULL); 53 dirp->dd_loc = 0; 54 } 55 if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) { 56 dirp->dd_size = getdirentries(dirp->dd_fd, 57 dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); 58 if (dirp->dd_size <= 0) 59 return (NULL); 60 } 61 dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); 62 if ((long)dp & 03) /* bogus pointer check */ 63 return (NULL); 64 if (dp->d_reclen <= 0 || 65 dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) 66 return (NULL); 67 dirp->dd_loc += dp->d_reclen; 68 if (dp->d_ino == 0) 69 continue; 70 if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW)) 71 continue; 72 return (dp); 73 } 74 } 75 76 int 77 readdir_r(dirp, entry, result) 78 DIR *dirp; 79 struct dirent *entry; 80 struct dirent **result; 81 { 82 struct dirent *dp; 83 int ret; 84 85 if (dirp->dd_fd < 0) { 86 return EBADF; 87 } 88 if ((ret = _FD_LOCK(dirp->dd_fd, FD_READ, NULL)) != 0) 89 return ret; 90 errno = 0; 91 dp = readdir(dirp); 92 if (dp == NULL && errno != 0) { 93 _FD_UNLOCK(dirp->dd_fd, FD_READ); 94 return errno; 95 } 96 if (dp != NULL) 97 memcpy(entry, dp, sizeof (struct dirent) - MAXNAMLEN + dp->d_namlen); 98 _FD_UNLOCK(dirp->dd_fd, FD_READ); 99 if (dp != NULL) 100 *result = entry; 101 else 102 *result = NULL; 103 return 0; 104 } 105