rotateLeft.c

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/**
 * \file
 *
 * \author  Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "tree.h"

void
treeRotateLeft(Tree * this, Tree node)
{
    Tree rightChild = TREE_RIGHT(node);
    Tree rcLeftSub  = TREE_RIGHT_LEFT(node);

    rightChild->left   = node;
    rightChild->parent = TREE_PARENT(node);
    node->right        = rcLeftSub;
    if (NULL != rcLeftSub) {
        rcLeftSub->parent  = node;
    }   

    if (NULL != TREE_PARENT(node)) {
        if (TREE_PARENT(node)->left == node) {
            TREE_PARENT(node)->left = rightChild;
        } else {
            TREE_PARENT(node)->right = rightChild;
        }   
    } else {
        *this = rightChild;
    }   

    node->parent = rightChild;
}

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