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
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/* $Id: kRbGetWithParent.h 35 2009-11-08 19:39:03Z bird $ */
/** @file
* kRbTmpl - Templated Red-Black Trees, Get Node With Parent.
*/
/*
* Copyright (c) 1999-2009 Knut St. Osmundsen <bird-kStuff-spamix@anduin.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* Gets a node from the tree and its parent node (if any).
* The tree remains unchanged.
*
* @returns Pointer to the node holding the given key.
* @param pRoot Pointer to the Red-Back tree's root structure.
* @param ppParent Pointer to a variable which will hold the pointer to the partent node on
* return. When no node is found, this will hold the last searched node.
* @param Key Key value of the node which is to be found.
*/
KRB_DECL(KRBNODE *) KRB_FN(GetWithParent)(KRBROOT *pRoot, KRBNODE **ppParent, KRBKEY Key)
{
register KRBNODE *pNode;
register KRBNODE *pParent;
KRB_READ_LOCK(pRoot);
pParent = NULL;
pNode = KRB_GET_POINTER_NULL(&pRoot->mpRoot);
while ( pNode != NULL
&& KRB_CMP_NE(pNode->mKey, Key))
{
pParent = pNode;
if (KRB_CMP_G(pNode->mKey, Key))
pNode = KRB_GET_POINTER_NULL(&pNode->mpLeft);
else
pNode = KRB_GET_POINTER_NULL(&pNode->mpRight);
}
KRB_READ_UNLOCK(pRoot);
*ppParent = pParent;
return pNode;
}
|
