update from main archive 961001

1 files changed, 108 insertions, 0 deletions

diff --git a/sysdeps/unix/readdir_r.c b/sysdeps/unix/readdir_r.c
new file mode 100644
index 0000000000..ef75c36234
--- /dev/null
+++ b/sysdeps/unix/readdir_r.c
@@ -0,0 +1,108 @@
+/* Copyright (C) 1991, 92, 93, 94, 95, 96 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.
+
+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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#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>
+
+
+/* Read a directory entry from DIRP.  */
+int
+__readdir_r (DIR *dirp, struct dirent *entry, struct dirent **result)
+{
+  struct dirent *dp;
+
+  __libc_lock_lock (dirp->lock);
+
+  do
+    {
+      size_t reclen;
+
+      if (dirp->offset >= dirp->size)
+	{
+	  /* We've emptied out our buffer.  Refill it.  */
+
+	  size_t maxread;
+	  off_t base;
+	  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
+
+	  base = dirp->filepos;
+	  bytes = __getdirentries (dirp->fd, dirp->data, maxread, &base);
+	  if (bytes <= 0)
+	    {
+	      dp = NULL;
+	      break;
+	    }
+	  dirp->size = (size_t) bytes;
+
+	  /* Reset the offset into the buffer.  */
+	  dirp->offset = 0;
+	}
+
+      dp = (struct dirent *) &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 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
+
+      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);
+
+  if (dp != NULL)
+    {
+      *entry = *dp;
+      *result = entry;
+    }
+
+  __libc_lock_unlock (dirp->lock);
+
+  return dp != NULL ? 0 : -1;
+}
+weak_alias (__readdir_r, readdir_r)