text: /* $Id: kAvlGet.h 29 2009-07-01 20:30:29Z bird $ */
  /** @file
   * kAvlTmpl - Templated AVL Trees, Get a Node.
   */
  
  /*
   * 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 (does not remove it!)
   *
   * @returns Pointer to the node holding the given key.
   * @param   pRoot       Pointer to the AVL-tree root structure.
   * @param   Key         Key value of the node which is to be found.
   */
  KAVL_DECL(KAVLNODE *) KAVL_FN(Get)(KAVLROOT *pRoot, KAVLKEY Key)
  {
      KAVLNODE *pNode;
  #ifdef KAVL_LOOKTHRU_CACHE
      KAVLTREEPTR *ppEntry;
  #endif
  
      KAVL_READ_LOCK(pRoot);
      if (pRoot->mpRoot == KAVL_NULL)
      {
          KAVL_READ_UNLOCK(pRoot);
          return NULL;
      }
  
  #ifdef KAVL_LOOKTHRU_CACHE
      ppEntry = &pRoot->maLookthru[KAVL_LOOKTHRU_HASH(Key)];
      pNode = KAVL_GET_POINTER_NULL(ppEntry);
      if (!pNode || KAVL_NE(pNode->mKey, Key))
  #endif
      {
          pNode = KAVL_GET_POINTER(&pRoot->mpRoot);
          while (KAVL_NE(pNode->mKey, Key))
          {
              if (KAVL_G(pNode->mKey, Key))
              {
                  if (pNode->mpLeft == KAVL_NULL)
                  {
                      KAVL_READ_UNLOCK(pRoot);
                      return NULL;
                  }
                  pNode = KAVL_GET_POINTER(&pNode->mpLeft);
              }
              else
              {
                  if (pNode->mpRight == KAVL_NULL)
                  {
                      KAVL_READ_UNLOCK(pRoot);
                      return NULL;
                  }
                  pNode = KAVL_GET_POINTER(&pNode->mpRight);
              }
          }
  
  #ifdef KAVL_LOOKTHRU_CACHE
          KAVL_SET_POINTER(ppEntry, pNode);
  #endif
      }
  
      KAVL_READ_UNLOCK(pRoot);
      return pNode;
  }
  
  