| 1 | /* |
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| 2 | * Copyright (c) 1983 Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 3. All advertising materials mentioning features or use of this software |
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| 14 | * must display the following acknowledgement: |
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| 15 | * This product includes software developed by the University of |
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| 16 | * California, Berkeley and its contributors. |
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| 17 | * 4. Neither the name of the University nor the names of its contributors |
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| 18 | * may be used to endorse or promote products derived from this software |
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| 19 | * without specific prior written permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 31 | * SUCH DAMAGE. |
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| 32 | */ |
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| 33 | |
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| 34 | /* Modified from newlib/libc/posix/readdir.c */ |
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| 35 | |
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| 36 | #include <dirent.h> |
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| 37 | #include <machine/syscall.h> |
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| 38 | |
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| 39 | #define __NR___getdents64 __NR_getdents64 |
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| 40 | |
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| 41 | static _syscall3(int,__getdents64,int,fd,struct dirent64 *,dirp,unsigned int,count) |
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| 42 | |
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| 43 | /* |
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| 44 | * get next entry in a directory. |
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| 45 | */ |
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| 46 | struct dirent64 * |
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| 47 | __readdir64 (dirp) |
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| 48 | register DIR *dirp; { |
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| 49 | register struct dirent64 *dp; |
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| 50 | |
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| 51 | #ifdef HAVE_DD_LOCK |
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| 52 | __lock_acquire_recursive(dirp->dd_lock); |
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| 53 | #endif |
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| 54 | |
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| 55 | if (dirp->dd_fd == -1) |
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| 56 | return NULL; |
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| 57 | |
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| 58 | for (;;) { |
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| 59 | if (dirp->dd_loc == 0) { |
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| 60 | dirp->dd_size = __getdents64 (dirp->dd_fd, |
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| 61 | (void *)dirp->dd_buf, |
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| 62 | dirp->dd_len); |
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| 63 | |
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| 64 | if (dirp->dd_size <= 0) { |
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| 65 | #ifdef HAVE_DD_LOCK |
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| 66 | __lock_release_recursive(dirp->dd_lock); |
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| 67 | #endif |
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| 68 | return NULL; |
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| 69 | } |
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| 70 | } |
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| 71 | if (dirp->dd_loc >= dirp->dd_size) { |
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| 72 | dirp->dd_loc = 0; |
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| 73 | continue; |
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| 74 | } |
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| 75 | dp = (struct dirent64 *)(dirp->dd_buf + dirp->dd_loc); |
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| 76 | if ((int)dp & 03) { /* bogus pointer check */ |
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| 77 | #ifdef HAVE_DD_LOCK |
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| 78 | __lock_release_recursive(dirp->dd_lock); |
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| 79 | #endif |
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| 80 | return NULL; |
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| 81 | } |
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| 82 | if (dp->d_reclen <= 0 || |
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| 83 | dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) { |
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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 NULL; |
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| 88 | } |
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| 89 | dirp->dd_loc += dp->d_reclen; |
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| 90 | if (dp->d_ino == 0) |
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| 91 | continue; |
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| 92 | #ifdef HAVE_DD_LOCK |
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| 93 | __lock_release_recursive(dirp->dd_lock); |
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| 94 | #endif |
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| 95 | return (dp); |
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| 96 | } |
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| 97 | } |
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