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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Read a directory in reentrant mode. Linux no-LFS version.
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Copyright (C) 2018-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dirent.h>
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#if !_DIRENT_MATCHES_DIRENT64
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/* Read a directory entry from DIRP. */
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int
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__readdir_r (DIR *dirp, struct dirent *entry, struct dirent **result)
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{
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struct dirent *dp;
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size_t reclen;
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int saved_errno = errno;
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__libc_lock_lock (dirp->lock);
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while (1)
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{
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/* If errno is changed from 0, the NULL return value indicates
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an actual error. It overrides a pending ENAMETOOLONG error. */
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__set_errno (0);
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dp = __readdir_unlocked (dirp);
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if (dp == NULL)
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{
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if (errno != 0)
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dirp->errcode = errno;
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break;
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}
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reclen = dp->d_reclen;
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if (reclen <= offsetof (struct dirent, d_name) + NAME_MAX + 1)
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break;
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/* The record is very long. It could still fit into the caller-supplied
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buffer if we can skip padding at the end. */
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size_t namelen = _D_EXACT_NAMLEN (dp);
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if (namelen <= NAME_MAX)
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{
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reclen = offsetof (struct dirent, d_name) + namelen + 1;
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break;
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}
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/* The name is too long. Ignore this file. */
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dirp->errcode = ENAMETOOLONG;
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}
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if (dp != NULL)
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{
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*result = memcpy (entry, dp, reclen);
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entry->d_reclen = reclen;
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}
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else
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*result = NULL;
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__libc_lock_unlock (dirp->lock);
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__set_errno (saved_errno);
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return dp != NULL ? 0 : dirp->errcode;
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}
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weak_alias (__readdir_r, readdir_r)
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#endif /* _DIRENT_MATCHES_DIRENT64 */
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