-/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
+/* Read a directory in reentrant mode. Linux LFS version.
+ Copyright (C) 1997-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If not,
- write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-#include <errno.h>
-#include <limits.h>
-#include <stddef.h>
-#include <string.h>
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* When _DIRENT_MATCHES_DIRENT64 is defined we can alias 'readdir64' to
+ 'readdir'. However the function signatures are not equal due
+ different return types, so we need to suppress {__}readdir so weak
+ and strong alias do not throw conflicting types errors. */
+#define readdir_r __no_readdir_r_decl
+#define __readdir_r __no___readdir_r_decl
#include <dirent.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <assert.h>
-
-#include <dirstream.h>
-
-/* Read a directory entry from DIRP, store result in ENTRY and return
- pointer to result in *RESULT. */
-int
-readdir64_r (DIR *dirp, struct dirent64 *entry, struct dirent64 **result)
-{
- struct dirent64 *dp;
- size_t reclen;
-
- __libc_lock_lock (dirp->lock);
-
- do
- {
- if (dirp->offset >= dirp->size)
- {
- /* We've emptied out our buffer. Refill it. */
-
- size_t maxread;
- ssize_t bytes;
-
-#ifndef _DIRENT_HAVE_D_RECLEN
- /* Fixed-size struct; must read one at a time (see below). */
- maxread = sizeof *dp;
-#else
- maxread = dirp->allocation;
-#endif
-
- bytes = __getdents64 (dirp->fd, dirp->data, maxread);
- if (bytes <= 0)
- {
- dp = NULL;
- /* Reclen != 0 signals that an error occurred. */
- reclen = bytes != 0;
- break;
- }
- dirp->size = (size_t) bytes;
- /* Reset the offset into the buffer. */
- dirp->offset = 0;
- }
+#define __READDIR_R __readdir64_r
+#define __GETDENTS __getdents64
+#define DIRENT_TYPE struct dirent64
- dp = (struct dirent64 *) &dirp->data[dirp->offset];
-
-#ifdef _DIRENT_HAVE_D_RECLEN
- reclen = dp->d_reclen;
-#else
- /* The only version of `struct dirent64' that lacks `d_reclen'
- is fixed-size. */
- assert (sizeof dp->d_name > 1);
- reclen = sizeof *dp;
- /* The name is not terminated if it is the largest possible size.
- Clobber the following byte to ensure proper null termination. We
- read just one entry at a time above so we know that byte will not
- be used later. */
- dp->d_name[sizeof dp->d_name] = '\0';
-#endif
+#include <sysdeps/posix/readdir_r.c>
- dirp->offset += reclen;
+#undef __readdir_r
+#undef readdir_r
-#ifdef _DIRENT_HAVE_D_OFF
- dirp->filepos = dp->d_off;
+#if _DIRENT_MATCHES_DIRENT64
+strong_alias (__readdir64_r, __readdir_r)
+weak_alias (__readdir64_r, readdir_r)
+weak_alias (__readdir64_r, readdir64_r)
#else
- dirp->filepos += reclen;
-#endif
-
- /* Skip deleted files. */
- }
- while (dp->d_ino == 0);
-
- if (dp != NULL)
- *result = memcpy (entry, dp, reclen);
- else
- *result = NULL;
-
- __libc_lock_unlock (dirp->lock);
-
- return dp != NULL ? 0 : reclen ? errno : 0;
-}
+/* The compat code expects the 'struct direct' with d_ino being a __ino_t
+ instead of __ino64_t. */
+# include <shlib-compat.h>
+versioned_symbol (libc, __readdir64_r, readdir64_r, GLIBC_2_2);
+# if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
+# include <olddirent.h>
+# define __READDIR_R attribute_compat_text_section __old_readdir64_r
+# define __GETDENTS __old_getdents64
+# define DIRENT_TYPE struct __old_dirent64
+# include <sysdeps/posix/readdir_r.c>
+compat_symbol (libc, __old_readdir64_r, readdir64_r, GLIBC_2_1);
+# endif /* SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2) */
+#endif /* _DIRENT_MATCHES_DIRENT64 */
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