| 1 | #ifndef HAVE_OPENDIR |
|---|
| 2 | |
|---|
| 3 | /* |
|---|
| 4 | * Copyright (c) 1983 Regents of the University of California. |
|---|
| 5 | * All rights reserved. |
|---|
| 6 | * |
|---|
| 7 | * Redistribution and use in source and binary forms, with or without |
|---|
| 8 | * modification, are permitted provided that the following conditions |
|---|
| 9 | * are met: |
|---|
| 10 | * 1. Redistributions of source code must retain the above copyright |
|---|
| 11 | * notice, this list of conditions and the following disclaimer. |
|---|
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
|---|
| 13 | * notice, this list of conditions and the following disclaimer in the |
|---|
| 14 | * documentation and/or other materials provided with the distribution. |
|---|
| 15 | * 3. All advertising materials mentioning features or use of this software |
|---|
| 16 | * must display the following acknowledgement: |
|---|
| 17 | * This product includes software developed by the University of |
|---|
| 18 | * California, Berkeley and its contributors. |
|---|
| 19 | * 4. Neither the name of the University nor the names of its contributors |
|---|
| 20 | * may be used to endorse or promote products derived from this software |
|---|
| 21 | * without specific prior written permission. |
|---|
| 22 | * |
|---|
| 23 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
|---|
| 24 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|---|
| 25 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|---|
| 26 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
|---|
| 27 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
|---|
| 28 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
|---|
| 29 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
|---|
| 30 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|---|
| 31 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
|---|
| 32 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
|---|
| 33 | * SUCH DAMAGE. |
|---|
| 34 | */ |
|---|
| 35 | |
|---|
| 36 | #if defined(LIBC_SCCS) && !defined(lint) |
|---|
| 37 | static char sccsid[] = "@(#)readdir.c 5.7 (Berkeley) 6/1/90"; |
|---|
| 38 | #endif /* LIBC_SCCS and not lint */ |
|---|
| 39 | |
|---|
| 40 | #include <dirent.h> |
|---|
| 41 | |
|---|
| 42 | extern int getdents (int fd, void *dp, int count); |
|---|
| 43 | |
|---|
| 44 | /* |
|---|
| 45 | * get next entry in a directory. |
|---|
| 46 | */ |
|---|
| 47 | struct dirent * |
|---|
| 48 | readdir (register DIR *dirp) |
|---|
| 49 | { |
|---|
| 50 | register struct dirent *dp; |
|---|
| 51 | |
|---|
| 52 | #ifdef HAVE_DD_LOCK |
|---|
| 53 | __lock_acquire_recursive(dirp->dd_lock); |
|---|
| 54 | #endif |
|---|
| 55 | |
|---|
| 56 | for (;;) { |
|---|
| 57 | if (dirp->dd_loc == 0) { |
|---|
| 58 | dirp->dd_size = getdents (dirp->dd_fd, |
|---|
| 59 | dirp->dd_buf, |
|---|
| 60 | dirp->dd_len); |
|---|
| 61 | |
|---|
| 62 | if (dirp->dd_size <= 0) { |
|---|
| 63 | #ifdef HAVE_DD_LOCK |
|---|
| 64 | __lock_release_recursive(dirp->dd_lock); |
|---|
| 65 | #endif |
|---|
| 66 | return NULL; |
|---|
| 67 | } |
|---|
| 68 | } |
|---|
| 69 | if (dirp->dd_loc >= dirp->dd_size) { |
|---|
| 70 | dirp->dd_loc = 0; |
|---|
| 71 | continue; |
|---|
| 72 | } |
|---|
| 73 | dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); |
|---|
| 74 | if (dp->d_reclen <= 0 || |
|---|
| 75 | dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) { |
|---|
| 76 | #ifdef HAVE_DD_LOCK |
|---|
| 77 | __lock_release_recursive(dirp->dd_lock); |
|---|
| 78 | #endif |
|---|
| 79 | return NULL; |
|---|
| 80 | } |
|---|
| 81 | dirp->dd_loc += dp->d_reclen; |
|---|
| 82 | if (dp->d_ino == 0) |
|---|
| 83 | continue; |
|---|
| 84 | #ifdef HAVE_DD_LOCK |
|---|
| 85 | __lock_release_recursive(dirp->dd_lock); |
|---|
| 86 | #endif |
|---|
| 87 | return (dp); |
|---|
| 88 | } |
|---|
| 89 | } |
|---|
| 90 | |
|---|
| 91 | #endif /* ! HAVE_OPENDIR */ |
|---|
