projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 15637ed4 RG |
1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. | |
| 3 | * 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) | |
| 35 | static char sccsid[] = "@(#)readdir.c 5.7 (Berkeley) 6/1/90"; | |
| 36 | #endif /* LIBC_SCCS and not lint */ | |
| 37 | ||
| 38 | #include <sys/param.h> | |
| 39 | #include <dirent.h> | |
| 40 | ||
| 41 | /* | |
| 42 | * get next entry in a directory. | |
| 43 | */ | |
| 44 | struct dirent * | |
| 45 | readdir(dirp) | |
| 46 | register DIR *dirp; | |
| 47 | { | |
| 48 | register struct dirent *dp; | |
| 49 | ||
| 50 | for (;;) { | |
| 51 | if (dirp->dd_loc == 0) { | |
| 52 | dirp->dd_size = getdirentries(dirp->dd_fd, | |
| 53 | dirp->dd_buf, dirp->dd_len, &dirp->dd_seek); | |
| 54 | if (dirp->dd_size <= 0) | |
| 55 | return NULL; | |
| 56 | } | |
| 57 | if (dirp->dd_loc >= dirp->dd_size) { | |
| 58 | dirp->dd_loc = 0; | |
| 59 | continue; | |
| 60 | } | |
| 61 | dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); | |
| 62 | if ((int)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 | return (dp); | |
| 71 | } | |
| 72 | } |