/* $Id$
 * Implementation of RTL_SPLAY_LINKS functions of libcaptive
 * Copyright (C) 2002 Jan Kratochvil <project-captive@jankratochvil.net>
 * 
 * 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; exactly version 2 of June 1991 is required
 * 
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */


#include "config.h"

#include "reactos/ntos/rtltypes.h"	/* self */
#include <glib/gmessages.h>


/**
 * RtlDelete:
 * @Links: Node to delete.
 * %NULL value is forbidden.
 *
 * Deletes the given node from its tree.
 * 
 * Returns: New root of the given tree. It may be %NULL if the tree becomes empty.
 */
PRTL_SPLAY_LINKS RtlDelete(PRTL_SPLAY_LINKS Links)
{
RTL_SPLAY_LINKS *root,**selfp;

	g_return_val_if_fail(Links!=NULL,NULL);

	for (root=Links;root->Parent!=root;) {
		g_assert(root->Parent!=NULL);
		root=root->Parent;
		}
	if (root==Links)
		selfp=&root;
	else if (Links->Parent->LeftChild==Links)
		selfp=&Links->Parent->LeftChild;
	else if (Links->Parent->RightChild==Links)
		selfp=&Links->Parent->RightChild;
	else g_assert_not_reached();	/* should not happen if the structures are valid */

	     if (!Links->LeftChild)
		*selfp=Links->RightChild;
	else if (!Links->RightChild)
		*selfp=Links->LeftChild;
	else g_assert_not_reached();	/* FIXME: NOT IMPLEMENTED YET */

	/* FIXME: rebalance: NOT IMPLEMENTED YET */

	return root;
}


/**
 * RtlSplay:
 * @Links: Root of the tree to rebalance.
 * %NULL value is forbidden.
 *
 * Rebalances the tree for optimal heights and effective operations.
 * FIXME: Currently a NOP in libcaptive.
 *
 * Returns: New root of the rebalanced tree.
 * It may or it may not be equal to the given @Links.
 */
PRTL_SPLAY_LINKS RtlSplay(PRTL_SPLAY_LINKS Links)
{
	g_return_val_if_fail(Links!=NULL,NULL);

	/* FIXME: rebalance: NOT IMPLEMENTED YET */

	return Links;
}