rotateLeft.c
1.33 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
/**
* \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 "tr/tree.h"
void
TR_treeRotateLeft(TR_Tree * this, TR_Tree node)
{
TR_Tree rightChild = TR_TREE_RIGHT(node);
TR_Tree rcLeftSub = TR_TREE_RIGHT_LEFT(node);
rightChild->left = node;
rightChild->parent = TR_TREE_PARENT(node);
node->right = rcLeftSub;
if (NULL != rcLeftSub) {
rcLeftSub->parent = node;
}
if (NULL != TR_TREE_PARENT(node)) {
if (TR_TREE_PARENT(node)->left == node) {
TR_TREE_PARENT(node)->left = rightChild;
} else {
TR_TREE_PARENT(node)->right = rightChild;
}
} else {
*this = rightChild;
}
node->parent = rightChild;
}
// vim: set ts=4 sw=4: