Move common dirent implementation from sysdeps/unix to sysdeps/posix.

1 files changed, 122 insertions, 0 deletions

diff --git a/sysdeps/posix/readdir.c b/sysdeps/posix/readdir.c
new file mode 100644
index 0000000000..be0fcaee9f
--- /dev/null
+++ b/sysdeps/posix/readdir.c
@@ -0,0 +1,122 @@
+/* Copyright (C) 1991-1997,1999,2000,2002,2007 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/>.  */
+
+#include <errno.h>
+#include <limits.h>
+#include <stddef.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <assert.h>
+
+#include <dirstream.h>
+
+#ifndef __READDIR
+# define __READDIR __readdir
+# define __GETDENTS __getdents
+# define DIRENT_TYPE struct dirent
+# define __READDIR_ALIAS
+#endif
+
+/* Read a directory entry from DIRP.  */
+DIRENT_TYPE *
+__READDIR (DIR *dirp)
+{
+  DIRENT_TYPE *dp;
+  int saved_errno = errno;
+
+#ifndef NOT_IN_libc
+  __libc_lock_lock (dirp->lock);
+#endif
+
+  do
+    {
+      size_t reclen;
+
+      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 = __GETDENTS (dirp->fd, dirp->data, maxread);
+	  if (bytes <= 0)
+	    {
+	      /* On some systems getdents fails with ENOENT when the
+		 open directory has been rmdir'd already.  POSIX.1
+		 requires that we treat this condition like normal EOF.  */
+	      if (bytes < 0 && errno == ENOENT)
+		bytes = 0;
+
+	      /* Don't modifiy errno when reaching EOF.  */
+	      if (bytes == 0)
+		__set_errno (saved_errno);
+	      dp = NULL;
+	      break;
+	    }
+	  dirp->size = (size_t) bytes;
+
+	  /* Reset the offset into the buffer.  */
+	  dirp->offset = 0;
+	}
+
+      dp = (DIRENT_TYPE *) &dirp->data[dirp->offset];
+
+#ifdef _DIRENT_HAVE_D_RECLEN
+      reclen = dp->d_reclen;
+#else
+      /* The only version of `struct dirent*' 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 jst 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
+
+      dirp->offset += reclen;
+
+#ifdef _DIRENT_HAVE_D_OFF
+      dirp->filepos = dp->d_off;
+#else
+      dirp->filepos += reclen;
+#endif
+
+      /* Skip deleted files.  */
+    } while (dp->d_ino == 0);
+
+#ifndef NOT_IN_libc
+  __libc_lock_unlock (dirp->lock);
+#endif
+
+  return dp;
+}
+
+#ifdef __READDIR_ALIAS
+weak_alias (__readdir, readdir)
+#endif