update for HEAD-2003091401

[reactos.git] / lib / ntdll / rtl / splaytree.c

diff --git a/lib/ntdll/rtl/splaytree.c b/lib/ntdll/rtl/splaytree.c
new file mode 100644 (file)
index 0000000..69dbb24
--- /dev/null
+++ b/lib/ntdll/rtl/splaytree.c
@@ -0,0 +1,70 @@
+/*
+ *  ReactOS kernel
+ *  Copyright (C) 2003 ReactOS Team
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/* $Id$
+ *
+ * COPYRIGHT:         See COPYING in the top level directory
+ * PROJECT:           ReactOS system libraries
+ * PURPOSE:           Splay-Tree implementation
+ * FILE:              lib/ntdll/rtl/splaytree.c
+ */
+
+#include <ddk/ntddk.h>
+
+/* FUNCTIONS *****************************************************************/
+
+PRTL_SPLAY_LINKS STDCALL
+RtlSubtreePredecessor (IN PRTL_SPLAY_LINKS Links)
+{
+  PRTL_SPLAY_LINKS Child;
+
+  Child = Links->RightChild;
+  if (Child == NULL)
+    return NULL;
+
+  if (Child->LeftChild == NULL)
+    return Child;
+
+  /* Get left-most child */
+  while (Child->LeftChild != NULL)
+    Child = Child->LeftChild;
+
+  return Child;
+}
+
+
+PRTL_SPLAY_LINKS STDCALL
+RtlSubtreeSuccessor (IN PRTL_SPLAY_LINKS Links)
+{
+  PRTL_SPLAY_LINKS Child;
+
+  Child = Links->LeftChild;
+  if (Child == NULL)
+    return NULL;
+
+  if (Child->RightChild == NULL)
+    return Child;
+
+  /* Get right-most child */
+  while (Child->RightChild != NULL)
+    Child = Child->RightChild;
+
+  return Child;
+}
+
+/* EOF */