tree_find.c

来自「C++ 编写的EROS RTOS」· C语言 代码 · 共 39 行

/*
 * Copyright (C) 1998, 1999, Jonathan S. Shapiro.
 *
 * This file is part of the EROS Operating System runtime library.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, 59 Temple Place - Suite 330 Boston, MA 02111-1307, USA.
 */


TREENODE *
tree_find(TREENODE *root, TREEKEY key)
{
  TREENODE *n = root;
  
  while (n != TREE_NIL) {
    int result = tree_compare_key(n,key);
    if (result == 0)
      return n;
    else if (result > 0)
      n = n->left;
    else
      n = n->right;
  }

  return TREE_NIL;
}