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