tinc-vpn.org Git - tinc/blob - splay_tree.h

   1 #ifndef TINC_SPLAY_TREE_H
   2 #define TINC_SPLAY_TREE_H
   3
   4 /*
   5     splay_tree.h -- header file for splay_tree.c
   6     Copyright (C) 2004-2013 Guus Sliepen <guus@tinc-vpn.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License along
  19     with this program; if not, write to the Free Software Foundation, Inc.,
  20     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21 */
  22
  23 typedef struct splay_node_t {
  24
  25         /* Linked list part */
  26
  27         struct splay_node_t *next;
  28         struct splay_node_t *prev;
  29
  30         /* Tree part */
  31
  32         struct splay_node_t *parent;
  33         struct splay_node_t *left;
  34         struct splay_node_t *right;
  35
  36         /* Payload */
  37
  38         void *data;
  39
  40 } splay_node_t;
  41
  42 typedef int (*splay_compare_t)(const void *data1, const void *data2);
  43 typedef void (*splay_action_t)(const void *data);
  44
  45 typedef struct splay_tree_t {
  46
  47         /* Linked list part */
  48
  49         splay_node_t *head;
  50         splay_node_t *tail;
  51
  52         /* Tree part */
  53
  54         splay_node_t *root;
  55
  56         splay_compare_t compare;
  57         splay_action_t delete;
  58
  59         unsigned int count;
  60         unsigned int generation;
  61
  62 } splay_tree_t;
  63
  64 /* (De)constructors */
  65
  66 extern splay_tree_t *splay_alloc_tree(splay_compare_t compare, splay_action_t delete) ATTR_MALLOC;
  67 extern void splay_free_tree(splay_tree_t *tree);
  68
  69 extern splay_node_t *splay_alloc_node(void) ATTR_MALLOC;
  70 extern void splay_free_node(splay_tree_t *tree, splay_node_t *node);
  71
  72 /* Insertion and deletion */
  73
  74 extern splay_node_t *splay_insert(splay_tree_t *tree, void *data);
  75 extern splay_node_t *splay_insert_node(splay_tree_t *tree, splay_node_t *node);
  76
  77 extern void splay_insert_top(splay_tree_t *tree, splay_node_t *node);
  78 extern void splay_insert_before(splay_tree_t *tree, splay_node_t *before, splay_node_t *node);
  79 extern void splay_insert_after(splay_tree_t *tree, splay_node_t *after, splay_node_t *node);
  80
  81 extern splay_node_t *splay_unlink(splay_tree_t *tree, void *data);
  82 extern void splay_unlink_node(splay_tree_t *tree, splay_node_t *node);
  83 extern void splay_delete(splay_tree_t *tree, void *data);
  84 extern void splay_delete_node(splay_tree_t *tree, splay_node_t *node);
  85
  86 /* Fast tree cleanup */
  87
  88 extern void splay_empty_tree(splay_tree_t *tree);
  89 extern void splay_delete_tree(splay_tree_t *tree);
  90
  91 /* Searching */
  92
  93 extern void *splay_search(splay_tree_t *tree, const void *data);
  94 extern void *splay_search_closest(splay_tree_t *tree, const void *data, int *result);
  95 extern void *splay_search_closest_smaller(splay_tree_t *tree, const void *data);
  96 extern void *splay_search_closest_greater(splay_tree_t *tree, const void *data);
  97
  98 extern splay_node_t *splay_search_node(splay_tree_t *tree, const void *data);
  99 extern splay_node_t *splay_search_closest_node(splay_tree_t *tree, const void *data, int *result);
 100 extern splay_node_t *splay_search_closest_node_nosplay(const splay_tree_t *tree, const void *data, int *result);
 101 extern splay_node_t *splay_search_closest_smaller_node(splay_tree_t *tree, const void *data);
 102 extern splay_node_t *splay_search_closest_greater_node(splay_tree_t *tree, const void *data);
 103
 104 /* Tree walking */
 105
 106 extern void splay_foreach(const splay_tree_t *tree, splay_action_t action);
 107 extern void splay_foreach_node(const splay_tree_t *tree, splay_action_t action);
 108
 109 /*
 110    Iterates over a tree.
 111
 112    CAUTION: while this construct supports deleting the current item,
 113    it does *not* support deleting *other* nodes while iterating on the tree.
 114  */
 115 #define splay_each(type, item, tree) (type *item = (type *)1; item; item = NULL) for(splay_node_t *node = (tree)->head, *next; item = node ? node->data : NULL, next = node ? node->next : NULL, node; node = next)
 116
 117 #endif