| 1 | /* Read a directory in reentrant mode. Linux no-LFS version. |
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| 2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <dirent.h> |
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| 20 | |
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| 21 | #if !_DIRENT_MATCHES_DIRENT64 |
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| 22 | /* Read a directory entry from DIRP. */ |
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| 23 | int |
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| 24 | __readdir_r (DIR *dirp, struct dirent *entry, struct dirent **result) |
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| 25 | { |
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| 26 | struct dirent *dp; |
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| 27 | size_t reclen; |
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| 28 | |
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| 29 | __libc_lock_lock (dirp->lock); |
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| 30 | |
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| 31 | while (1) |
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| 32 | { |
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| 33 | dp = __readdir_unlocked (dirp); |
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| 34 | if (dp == NULL) |
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| 35 | break; |
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| 36 | |
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| 37 | reclen = dp->d_reclen; |
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| 38 | if (reclen <= offsetof (struct dirent, d_name) + NAME_MAX + 1) |
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| 39 | break; |
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| 40 | |
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| 41 | /* The record is very long. It could still fit into the caller-supplied |
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| 42 | buffer if we can skip padding at the end. */ |
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| 43 | size_t namelen = _D_EXACT_NAMLEN (dp); |
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| 44 | if (namelen <= NAME_MAX) |
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| 45 | { |
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| 46 | reclen = offsetof (struct dirent, d_name) + namelen + 1; |
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| 47 | break; |
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| 48 | } |
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| 49 | |
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| 50 | /* The name is too long. Ignore this file. */ |
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| 51 | dirp->errcode = ENAMETOOLONG; |
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| 52 | } |
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| 53 | |
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| 54 | if (dp != NULL) |
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| 55 | { |
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| 56 | *result = memcpy (entry, dp, reclen); |
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| 57 | entry->d_reclen = reclen; |
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| 58 | } |
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| 59 | else |
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| 60 | *result = NULL; |
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| 61 | |
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| 62 | __libc_lock_unlock (dirp->lock); |
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| 63 | |
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| 64 | return dp != NULL ? 0 : dirp->errcode; |
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| 65 | } |
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| 66 | |
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| 67 | weak_alias (__readdir_r, readdir_r) |
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| 68 | #endif /* _DIRENT_MATCHES_DIRENT64 */ |
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| 69 | |
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