reactos/lib/rtl/splaytree.c

   1 /*
   2  *  ReactOS kernel
   3  *  Copyright (C) 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * COPYRIGHT:         See COPYING in the top level directory
  22  * PROJECT:           ReactOS system libraries
  23  * PURPOSE:           Splay-Tree implementation
  24  * FILE:              lib/rtl/splaytree.c
  25  */
  26
  27 #include <ddk/ntddk.h>
  28
  29 #define NDEBUG
  30 #include <debug.h>
  31
  32
  33 /* FUNCTIONS *****************************************************************/
  34
  35 /*
  36 * @unimplemented
  37 */
  38 PRTL_SPLAY_LINKS
  39 STDCALL
  40 RtlDelete (
  41         PRTL_SPLAY_LINKS Links
  42         )
  43 {
  44         UNIMPLEMENTED;
  45         return 0;
  46 }
  47
  48 /*
  49 * @unimplemented
  50 */
  51 VOID
  52 STDCALL
  53 RtlDeleteNoSplay (
  54         PRTL_SPLAY_LINKS Links,
  55         PRTL_SPLAY_LINKS *Root
  56         )
  57 {
  58         UNIMPLEMENTED;
  59 }
  60
  61
  62 /*
  63 * @unimplemented
  64 */
  65 PRTL_SPLAY_LINKS
  66 STDCALL
  67 RtlRealPredecessor (
  68         PRTL_SPLAY_LINKS Links
  69         )
  70 {
  71         UNIMPLEMENTED;
  72         return 0;
  73 }
  74
  75 /*
  76 * @unimplemented
  77 */
  78 PRTL_SPLAY_LINKS
  79 STDCALL
  80 RtlRealSuccessor (
  81         PRTL_SPLAY_LINKS Links
  82         )
  83 {
  84         UNIMPLEMENTED;
  85         return 0;
  86 }
  87
  88 /*
  89 * @unimplemented
  90 */
  91 PRTL_SPLAY_LINKS
  92 STDCALL
  93 RtlSplay (
  94         PRTL_SPLAY_LINKS Links
  95         )
  96 {
  97         UNIMPLEMENTED;
  98         return 0;
  99 }
 100
 101
 102 /*
 103 * @implemented
 104 */
 105 PRTL_SPLAY_LINKS STDCALL
 106 RtlSubtreePredecessor (IN PRTL_SPLAY_LINKS Links)
 107 {
 108    PRTL_SPLAY_LINKS Child;
 109
 110    Child = Links->RightChild;
 111    if (Child == NULL)
 112       return NULL;
 113
 114    if (Child->LeftChild == NULL)
 115       return Child;
 116
 117    /* Get left-most child */
 118    while (Child->LeftChild != NULL)
 119       Child = Child->LeftChild;
 120
 121    return Child;
 122 }
 123
 124 /*
 125 * @implemented
 126 */
 127 PRTL_SPLAY_LINKS STDCALL
 128 RtlSubtreeSuccessor (IN PRTL_SPLAY_LINKS Links)
 129 {
 130    PRTL_SPLAY_LINKS Child;
 131
 132    Child = Links->LeftChild;
 133    if (Child == NULL)
 134       return NULL;
 135
 136    if (Child->RightChild == NULL)
 137       return Child;
 138
 139    /* Get right-most child */
 140    while (Child->RightChild != NULL)
 141       Child = Child->RightChild;
 142
 143    return Child;
 144 }
 145
 146 /* EOF */