Consolidate getdirentries{64} implementation

This patch consolidates Linux getdirentries{64} implementation on just
the default sysdeps/unix/sysv/linux/getdirentries{64} ones.  The default
implementation handles the Linux requirements:

  * getdirentries is only built for _DIRENT_MATCHES_DIRENT64 being 0.

  * getdirentries64 is always built and aliased to getdents for ABIs
    that define _DIRENT_MATCHES_DIRENT64 to 1.

Checked on aarch64-linux-gnu, x86_64-linux-gnu, i686-linux-gnu,
sparcv9-linux-gnu, sparc64-linux-gnu, powerpc-linux-gnu, and
powerpc64le-linux-gnu.

	* sysdeps/unix/sysv/linux/getdirentries.c (getdirentries): Build iff
	_DIRENT_MATCHES_DIRENT64 is not defined.
	* sysdeps/unix/sysv/linux/getdirentries64.c (getdirentries64): Open
	implementation and alias to getdirentries if _DIRENT_MATCHES_DIRENT64
	is defined.
	* sysdeps/unix/sysv/linux/wordsize-64/getdirentries.c: Remove file.
	* sysdeps/unix/sysv/linux/wordsize-64/getdirentries64.c: Remove file.

1 files changed, 39 insertions, 3 deletions

diff --git a/sysdeps/unix/sysv/linux/getdirentries64.c b/sysdeps/unix/sysv/linux/getdirentries64.c
index e486a36..532f2fc 100644
--- a/sysdeps/unix/sysv/linux/getdirentries64.c
+++ b/sysdeps/unix/sysv/linux/getdirentries64.c
@@ -1,3 +1,39 @@
-#define GETDIRENTRIES getdirentries64
-#define __GETDENTS __getdents64
-#include "getdirentries.c"
+/* Get directory entries in a filesystem-independent format.  LFS version.
+   Copyright (C) 1993-2018 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 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
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#define getdirentries __no_getdirentries_decl
+#include <dirent.h>
+#undef getdirentries
+#include <unistd.h>
+
+ssize_t
+getdirentries64 (int fd, char *buf, size_t nbytes, off64_t *basep)
+{
+  off64_t base = __lseek64 (fd, (off_t) 0, SEEK_CUR);
+
+  ssize_t result = __getdents64 (fd, buf, nbytes);
+
+  if (result != -1)
+    *basep = base;
+
+  return result;
+}
+
+#if _DIRENT_MATCHES_DIRENT64
+weak_alias (getdirentries64, getdirentries)
+#endif