]> git.meshlink.io Git - meshlink/commitdiff
Remove unused AVL tree library.
authorGuus Sliepen <guus@tinc-vpn.org>
Thu, 31 Dec 2009 12:09:14 +0000 (13:09 +0100)
committerGuus Sliepen <guus@tinc-vpn.org>
Thu, 31 Dec 2009 12:09:14 +0000 (13:09 +0100)
lib/avl_tree.c [deleted file]
lib/avl_tree.h [deleted file]

diff --git a/lib/avl_tree.c b/lib/avl_tree.c
deleted file mode 100644 (file)
index dd21b80..0000000
+++ /dev/null
@@ -1,708 +0,0 @@
-/*
-    avl_tree.c -- avl_ tree and linked list convenience
-    Copyright (C) 1998 Michael H. Buselli
-                  2000-2005 Ivo Timmermans,
-                  2000-2006 Guus Sliepen <guus@tinc-vpn.org>
-                  2000-2005 Wessel Dankers <wsl@tinc-vpn.org>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program 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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
-    Original AVL tree library by Michael H. Buselli <cosine@cosine.org>.
-
-    Modified 2000-11-28 by Wessel Dankers <wsl@tinc-vpn.org> to use counts
-    instead of depths, to add the ->next and ->prev and to generally obfuscate
-    the code. Mail me if you found a bug.
-
-    Cleaned up and incorporated some of the ideas from the red-black tree
-    library for inclusion into tinc (http://www.tinc-vpn.org/) by
-    Guus Sliepen <guus@tinc-vpn.org>.
-*/
-
-#include "system.h"
-
-#include "avl_tree.h"
-#include "xalloc.h"
-
-#ifdef AVL_COUNT
-#define AVL_NODE_COUNT(n)  ((n) ? (n)->count : 0)
-#define AVL_L_COUNT(n)     (AVL_NODE_COUNT((n)->left))
-#define AVL_R_COUNT(n)     (AVL_NODE_COUNT((n)->right))
-#define AVL_CALC_COUNT(n)  (AVL_L_COUNT(n) + AVL_R_COUNT(n) + 1)
-#endif
-
-#ifdef AVL_DEPTH
-#define AVL_NODE_DEPTH(n)  ((n) ? (n)->depth : 0)
-#define L_AVL_DEPTH(n)     (AVL_NODE_DEPTH((n)->left))
-#define R_AVL_DEPTH(n)     (AVL_NODE_DEPTH((n)->right))
-#define AVL_CALC_DEPTH(n)  ((L_AVL_DEPTH(n)>R_AVL_DEPTH(n)?L_AVL_DEPTH(n):R_AVL_DEPTH(n)) + 1)
-#endif
-
-#ifndef AVL_DEPTH
-static int lg(unsigned int u) __attribute__ ((__const__));
-
-static int lg(unsigned int u) {
-       int r = 1;
-
-       if(!u)
-               return 0;
-
-       if(u & 0xffff0000) {
-               u >>= 16;
-               r += 16;
-       }
-
-       if(u & 0x0000ff00) {
-               u >>= 8;
-               r += 8;
-       }
-
-       if(u & 0x000000f0) {
-               u >>= 4;
-               r += 4;
-       }
-
-       if(u & 0x0000000c) {
-               u >>= 2;
-               r += 2;
-       }
-
-       if(u & 0x00000002)
-               r++;
-
-       return r;
-}
-#endif
-
-/* Internal helper functions */
-
-static int avl_check_balance(const avl_node_t *node) {
-#ifdef AVL_DEPTH
-       int d;
-
-       d = R_AVL_DEPTH(node) - L_AVL_DEPTH(node);
-
-       return d < -1 ? -1 : d > 1 ? 1 : 0;
-#else
-/*      int d;
- *      d = lg(AVL_R_COUNT(node)) - lg(AVL_L_COUNT(node));
- *      d = d<-1?-1:d>1?1:0;
- */
-       int pl, r;
-
-       pl = lg(AVL_L_COUNT(node));
-       r = AVL_R_COUNT(node);
-
-       if(r >> pl + 1)
-               return 1;
-
-       if(pl < 2 || r >> pl - 2)
-               return 0;
-
-       return -1;
-#endif
-}
-
-static void avl_rebalance(avl_tree_t *tree, avl_node_t *node) {
-       avl_node_t *child;
-       avl_node_t *gchild;
-       avl_node_t *parent;
-       avl_node_t **superparent;
-
-       parent = node;
-
-       while(node) {
-               parent = node->parent;
-
-               superparent =
-                       parent ? node ==
-                       parent->left ? &parent->left : &parent->right : &tree->root;
-
-               switch (avl_check_balance(node)) {
-                       case -1:
-                               child = node->left;
-#ifdef AVL_DEPTH
-                               if(L_AVL_DEPTH(child) >= R_AVL_DEPTH(child)) {
-#else
-                               if(AVL_L_COUNT(child) >= AVL_R_COUNT(child)) {
-#endif
-                                       node->left = child->right;
-                                       if(node->left)
-                                               node->left->parent = node;
-
-                                       child->right = node;
-                                       node->parent = child;
-                                       *superparent = child;
-                                       child->parent = parent;
-#ifdef AVL_COUNT
-                                       node->count = AVL_CALC_COUNT(node);
-                                       child->count = AVL_CALC_COUNT(child);
-#endif
-#ifdef AVL_DEPTH
-                                       node->depth = AVL_CALC_DEPTH(node);
-                                       child->depth = AVL_CALC_DEPTH(child);
-#endif
-                               } else {
-                                       gchild = child->right;
-                                       node->left = gchild->right;
-
-                                       if(node->left)
-                                               node->left->parent = node;
-                                       child->right = gchild->left;
-
-                                       if(child->right)
-                                               child->right->parent = child;
-                                       gchild->right = node;
-
-                                       if(gchild->right)
-                                               gchild->right->parent = gchild;
-                                       gchild->left = child;
-
-                                       if(gchild->left)
-                                               gchild->left->parent = gchild;
-                                       *superparent = gchild;
-
-                                       gchild->parent = parent;
-#ifdef AVL_COUNT
-                                       node->count = AVL_CALC_COUNT(node);
-                                       child->count = AVL_CALC_COUNT(child);
-                                       gchild->count = AVL_CALC_COUNT(gchild);
-#endif
-#ifdef AVL_DEPTH
-                                       node->depth = AVL_CALC_DEPTH(node);
-                                       child->depth = AVL_CALC_DEPTH(child);
-                                       gchild->depth = AVL_CALC_DEPTH(gchild);
-#endif
-                               }
-                               break;
-
-                       case 1:
-                               child = node->right;
-#ifdef AVL_DEPTH
-                               if(R_AVL_DEPTH(child) >= L_AVL_DEPTH(child)) {
-#else
-                               if(AVL_R_COUNT(child) >= AVL_L_COUNT(child)) {
-#endif
-                                       node->right = child->left;
-                                       if(node->right)
-                                               node->right->parent = node;
-                                       child->left = node;
-                                       node->parent = child;
-                                       *superparent = child;
-                                       child->parent = parent;
-#ifdef AVL_COUNT
-                                       node->count = AVL_CALC_COUNT(node);
-                                       child->count = AVL_CALC_COUNT(child);
-#endif
-#ifdef AVL_DEPTH
-                                       node->depth = AVL_CALC_DEPTH(node);
-                                       child->depth = AVL_CALC_DEPTH(child);
-#endif
-                               } else {
-                                       gchild = child->left;
-                                       node->right = gchild->left;
-
-                                       if(node->right)
-                                               node->right->parent = node;
-                                       child->left = gchild->right;
-
-                                       if(child->left)
-                                               child->left->parent = child;
-                                       gchild->left = node;
-
-                                       if(gchild->left)
-                                               gchild->left->parent = gchild;
-                                       gchild->right = child;
-
-                                       if(gchild->right)
-                                               gchild->right->parent = gchild;
-
-                                       *superparent = gchild;
-                                       gchild->parent = parent;
-#ifdef AVL_COUNT
-                                       node->count = AVL_CALC_COUNT(node);
-                                       child->count = AVL_CALC_COUNT(child);
-                                       gchild->count = AVL_CALC_COUNT(gchild);
-#endif
-#ifdef AVL_DEPTH
-                                       node->depth = AVL_CALC_DEPTH(node);
-                                       child->depth = AVL_CALC_DEPTH(child);
-                                       gchild->depth = AVL_CALC_DEPTH(gchild);
-#endif
-                               }
-                               break;
-
-                       default:
-#ifdef AVL_COUNT
-                               node->count = AVL_CALC_COUNT(node);
-#endif
-#ifdef AVL_DEPTH
-                               node->depth = AVL_CALC_DEPTH(node);
-#endif
-               }
-               node = parent;
-       }
-}
-
-/* (De)constructors */
-
-avl_tree_t *avl_alloc_tree(avl_compare_t compare, avl_action_t delete) {
-       avl_tree_t *tree;
-
-       tree = xmalloc_and_zero(sizeof(avl_tree_t));
-       tree->compare = compare;
-       tree->delete = delete;
-
-       return tree;
-}
-
-void avl_free_tree(avl_tree_t *tree) {
-       free(tree);
-}
-
-avl_node_t *avl_alloc_node(void) {
-       return xmalloc_and_zero(sizeof(avl_node_t));
-}
-
-void avl_free_node(avl_tree_t *tree, avl_node_t *node) {
-       if(node->data && tree->delete)
-               tree->delete(node->data);
-
-       free(node);
-}
-
-/* Searching */
-
-void *avl_search(const avl_tree_t *tree, const void *data) {
-       avl_node_t *node;
-
-       node = avl_search_node(tree, data);
-
-       return node ? node->data : NULL;
-}
-
-void *avl_search_closest(const avl_tree_t *tree, const void *data, int *result) {
-       avl_node_t *node;
-
-       node = avl_search_closest_node(tree, data, result);
-
-       return node ? node->data : NULL;
-}
-
-void *avl_search_closest_smaller(const avl_tree_t *tree, const void *data) {
-       avl_node_t *node;
-
-       node = avl_search_closest_smaller_node(tree, data);
-
-       return node ? node->data : NULL;
-}
-
-void *avl_search_closest_greater(const avl_tree_t *tree, const void *data) {
-       avl_node_t *node;
-
-       node = avl_search_closest_greater_node(tree, data);
-
-       return node ? node->data : NULL;
-}
-
-avl_node_t *avl_search_node(const avl_tree_t *tree, const void *data) {
-       avl_node_t *node;
-       int result;
-
-       node = avl_search_closest_node(tree, data, &result);
-
-       return result ? NULL : node;
-}
-
-avl_node_t *avl_search_closest_node(const avl_tree_t *tree, const void *data,
-                                                                       int *result) {
-       avl_node_t *node;
-       int c;
-
-       node = tree->root;
-
-       if(!node) {
-               if(result)
-                       *result = 0;
-               return NULL;
-       }
-
-       for(;;) {
-               c = tree->compare(data, node->data);
-
-               if(c < 0) {
-                       if(node->left)
-                               node = node->left;
-                       else {
-                               if(result)
-                                       *result = -1;
-                               break;
-                       }
-               } else if(c > 0) {
-                       if(node->right)
-                               node = node->right;
-                       else {
-                               if(result)
-                                       *result = 1;
-                               break;
-                       }
-               } else {
-                       if(result)
-                               *result = 0;
-                       break;
-               }
-       }
-
-       return node;
-}
-
-avl_node_t *avl_search_closest_smaller_node(const avl_tree_t *tree,
-                                                                                       const void *data) {
-       avl_node_t *node;
-       int result;
-
-       node = avl_search_closest_node(tree, data, &result);
-
-       if(result < 0)
-               node = node->prev;
-
-       return node;
-}
-
-avl_node_t *avl_search_closest_greater_node(const avl_tree_t *tree,
-                                                                                       const void *data) {
-       avl_node_t *node;
-       int result;
-
-       node = avl_search_closest_node(tree, data, &result);
-
-       if(result > 0)
-               node = node->next;
-
-       return node;
-}
-
-/* Insertion and deletion */
-
-avl_node_t *avl_insert(avl_tree_t *tree, void *data) {
-       avl_node_t *closest, *new;
-       int result;
-
-       if(!tree->root) {
-               new = avl_alloc_node();
-               new->data = data;
-               avl_insert_top(tree, new);
-       } else {
-               closest = avl_search_closest_node(tree, data, &result);
-
-               switch (result) {
-                       case -1:
-                               new = avl_alloc_node();
-                               new->data = data;
-                               avl_insert_before(tree, closest, new);
-                               break;
-
-                       case 1:
-                               new = avl_alloc_node();
-                               new->data = data;
-                               avl_insert_after(tree, closest, new);
-                               break;
-
-                       default:
-                               return NULL;
-               }
-       }
-
-#ifdef AVL_COUNT
-       new->count = 1;
-#endif
-#ifdef AVL_DEPTH
-       new->depth = 1;
-#endif
-
-       return new;
-}
-
-avl_node_t *avl_insert_node(avl_tree_t *tree, avl_node_t *node) {
-       avl_node_t *closest;
-       int result;
-
-       if(!tree->root)
-               avl_insert_top(tree, node);
-       else {
-               closest = avl_search_closest_node(tree, node->data, &result);
-
-               switch (result) {
-                       case -1:
-                               avl_insert_before(tree, closest, node);
-                               break;
-
-                       case 1:
-                               avl_insert_after(tree, closest, node);
-                               break;
-
-                       case 0:
-                               return NULL;
-               }
-       }
-
-#ifdef AVL_COUNT
-       node->count = 1;
-#endif
-#ifdef AVL_DEPTH
-       node->depth = 1;
-#endif
-
-       return node;
-}
-
-void avl_insert_top(avl_tree_t *tree, avl_node_t *node) {
-       node->prev = node->next = node->parent = NULL;
-       tree->head = tree->tail = tree->root = node;
-}
-
-void avl_insert_before(avl_tree_t *tree, avl_node_t *before,
-                                          avl_node_t *node) {
-       if(!before) {
-               if(tree->tail)
-                       avl_insert_after(tree, tree->tail, node);
-               else
-                       avl_insert_top(tree, node);
-               return;
-       }
-
-       node->next = before;
-       node->parent = before;
-       node->prev = before->prev;
-
-       if(before->left) {
-               avl_insert_after(tree, before->prev, node);
-               return;
-       }
-
-       if(before->prev)
-               before->prev->next = node;
-       else
-               tree->head = node;
-
-       before->prev = node;
-       before->left = node;
-
-       avl_rebalance(tree, before);
-}
-
-void avl_insert_after(avl_tree_t *tree, avl_node_t *after, avl_node_t *node) {
-       if(!after) {
-               if(tree->head)
-                       avl_insert_before(tree, tree->head, node);
-               else
-                       avl_insert_top(tree, node);
-               return;
-       }
-
-       if(after->right) {
-               avl_insert_before(tree, after->next, node);
-               return;
-       }
-
-       node->prev = after;
-       node->parent = after;
-       node->next = after->next;
-
-       if(after->next)
-               after->next->prev = node;
-       else
-               tree->tail = node;
-
-       after->next = node;
-       after->right = node;
-
-       avl_rebalance(tree, after);
-}
-
-avl_node_t *avl_unlink(avl_tree_t *tree, void *data) {
-       avl_node_t *node;
-
-       node = avl_search_node(tree, data);
-
-       if(node)
-               avl_unlink_node(tree, node);
-
-       return node;
-}
-
-void avl_unlink_node(avl_tree_t *tree, avl_node_t *node) {
-       avl_node_t *parent;
-       avl_node_t **superparent;
-       avl_node_t *subst, *left, *right;
-       avl_node_t *balnode;
-
-       if(node->prev)
-               node->prev->next = node->next;
-       else
-               tree->head = node->next;
-       if(node->next)
-               node->next->prev = node->prev;
-       else
-               tree->tail = node->prev;
-
-       parent = node->parent;
-
-       superparent =
-               parent ? node ==
-               parent->left ? &parent->left : &parent->right : &tree->root;
-
-       left = node->left;
-       right = node->right;
-       if(!left) {
-               *superparent = right;
-
-               if(right)
-                       right->parent = parent;
-
-               balnode = parent;
-       } else if(!right) {
-               *superparent = left;
-               left->parent = parent;
-               balnode = parent;
-       } else {
-               subst = node->prev;
-
-               if(subst == left) {
-                       balnode = subst;
-               } else {
-                       balnode = subst->parent;
-                       balnode->right = subst->left;
-
-                       if(balnode->right)
-                               balnode->right->parent = balnode;
-
-                       subst->left = left;
-                       left->parent = subst;
-               }
-
-               subst->right = right;
-               subst->parent = parent;
-               right->parent = subst;
-               *superparent = subst;
-       }
-
-       avl_rebalance(tree, balnode);
-
-       node->next = node->prev = node->parent = node->left = node->right = NULL;
-
-#ifdef AVL_COUNT
-       node->count = 0;
-#endif
-#ifdef AVL_DEPTH
-       node->depth = 0;
-#endif
-}
-
-void avl_delete_node(avl_tree_t *tree, avl_node_t *node) {
-       avl_unlink_node(tree, node);
-       avl_free_node(tree, node);
-}
-
-void avl_delete(avl_tree_t *tree, void *data) {
-       avl_node_t *node;
-
-       node = avl_search_node(tree, data);
-
-       if(node)
-               avl_delete_node(tree, node);
-}
-
-/* Fast tree cleanup */
-
-void avl_delete_tree(avl_tree_t *tree) {
-       avl_node_t *node, *next;
-
-       for(node = tree->head; node; node = next) {
-               next = node->next;
-               avl_free_node(tree, node);
-       }
-
-       avl_free_tree(tree);
-}
-
-/* Tree walking */
-
-void avl_foreach(const avl_tree_t *tree, avl_action_t action) {
-       avl_node_t *node, *next;
-
-       for(node = tree->head; node; node = next) {
-               next = node->next;
-               action(node->data);
-       }
-}
-
-void avl_foreach_node(const avl_tree_t *tree, avl_action_t action) {
-       avl_node_t *node, *next;
-
-       for(node = tree->head; node; node = next) {
-               next = node->next;
-               action(node);
-       }
-}
-
-/* Indexing */
-
-#ifdef AVL_COUNT
-unsigned int avl_count(const avl_tree_t *tree) {
-       return AVL_NODE_COUNT(tree->root);
-}
-
-avl_node_t *avl_get_node(const avl_tree_t *tree, unsigned int index) {
-       avl_node_t *node;
-       unsigned int c;
-
-       node = tree->root;
-
-       while(node) {
-               c = AVL_L_COUNT(node);
-
-               if(index < c) {
-                       node = node->left;
-               } else if(index > c) {
-                       node = node->right;
-                       index -= c + 1;
-               } else {
-                       return node;
-               }
-       }
-
-       return NULL;
-}
-
-unsigned int avl_index(const avl_node_t *node) {
-       avl_node_t *next;
-       unsigned int index;
-
-       index = AVL_L_COUNT(node);
-
-       while((next = node->parent)) {
-               if(node == next->right)
-                       index += AVL_L_COUNT(next) + 1;
-               node = next;
-       }
-
-       return index;
-}
-#endif
-#ifdef AVL_DEPTH
-unsigned int avl_depth(const avl_tree_t *tree) {
-       return AVL_NODE_DEPTH(tree->root);
-}
-#endif
diff --git a/lib/avl_tree.h b/lib/avl_tree.h
deleted file mode 100644 (file)
index f442934..0000000
+++ /dev/null
@@ -1,143 +0,0 @@
-/*
-    avl_tree.h -- header file for avl_tree.c
-    Copyright (C) 1998 Michael H. Buselli
-                  2000-2005 Ivo Timmermans,
-                  2000-2006 Guus Sliepen <guus@tinc-vpn.org>
-                  2000-2005 Wessel Dankers <wsl@tinc-vpn.org>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program 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 General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
-    Original AVL tree library by Michael H. Buselli <cosine@cosine.org>.
-
-    Modified 2000-11-28 by Wessel Dankers <wsl@tinc-vpn.org> to use counts
-    instead of depths, to add the ->next and ->prev and to generally obfuscate
-    the code. Mail me if you found a bug.
-
-    Cleaned up and incorporated some of the ideas from the red-black tree
-    library for inclusion into tinc (http://www.tinc-vpn.org/) by
-    Guus Sliepen <guus@tinc-vpn.org>.
-*/
-
-
-#ifndef __AVL_TREE_H__
-#define __AVL_TREE_H__
-
-#ifndef AVL_DEPTH
-#ifndef AVL_COUNT
-#define AVL_DEPTH
-#endif
-#endif
-
-typedef struct avl_node_t {
-
-       /* Linked list part */
-
-       struct avl_node_t *next;
-       struct avl_node_t *prev;
-
-       /* Tree part */
-
-       struct avl_node_t *parent;
-       struct avl_node_t *left;
-       struct avl_node_t *right;
-
-#ifdef AVL_COUNT
-       unsigned int count;
-#endif
-#ifdef AVL_DEPTH
-       unsigned char depth;
-#endif
-
-       /* Payload */
-
-       void *data;
-
-} avl_node_t;
-
-typedef int (*avl_compare_t)(const void *, const void *);
-typedef void (*avl_action_t)(const void *);
-typedef void (*avl_action_node_t)(const avl_node_t *);
-
-typedef struct avl_tree_t {
-
-       /* Linked list part */
-
-       avl_node_t *head;
-       avl_node_t *tail;
-
-       /* Tree part */
-
-       avl_node_t *root;
-
-       avl_compare_t compare;
-       avl_action_t delete;
-
-} avl_tree_t;
-
-/* (De)constructors */
-
-extern avl_tree_t *avl_alloc_tree(avl_compare_t, avl_action_t);
-extern void avl_free_tree(avl_tree_t *);
-
-extern avl_node_t *avl_alloc_node(void);
-extern void avl_free_node(avl_tree_t *tree, avl_node_t *);
-
-/* Insertion and deletion */
-
-extern avl_node_t *avl_insert(avl_tree_t *, void *);
-extern avl_node_t *avl_insert_node(avl_tree_t *, avl_node_t *);
-
-extern void avl_insert_top(avl_tree_t *, avl_node_t *);
-extern void avl_insert_before(avl_tree_t *, avl_node_t *, avl_node_t *);
-extern void avl_insert_after(avl_tree_t *, avl_node_t *, avl_node_t *);
-
-extern avl_node_t *avl_unlink(avl_tree_t *, void *);
-extern void avl_unlink_node(avl_tree_t *tree, avl_node_t *);
-extern void avl_delete(avl_tree_t *, void *);
-extern void avl_delete_node(avl_tree_t *, avl_node_t *);
-
-/* Fast tree cleanup */
-
-extern void avl_delete_tree(avl_tree_t *);
-
-/* Searching */
-
-extern void *avl_search(const avl_tree_t *, const void *);
-extern void *avl_search_closest(const avl_tree_t *, const void *, int *);
-extern void *avl_search_closest_smaller(const avl_tree_t *, const void *);
-extern void *avl_search_closest_greater(const avl_tree_t *, const void *);
-
-extern avl_node_t *avl_search_node(const avl_tree_t *, const void *);
-extern avl_node_t *avl_search_closest_node(const avl_tree_t *, const void *, int *);
-extern avl_node_t *avl_search_closest_smaller_node(const avl_tree_t *, const void *);
-extern avl_node_t *avl_search_closest_greater_node(const avl_tree_t *, const void *);
-
-/* Tree walking */
-
-extern void avl_foreach(const avl_tree_t *, avl_action_t);
-extern void avl_foreach_node(const avl_tree_t *, avl_action_t);
-
-/* Indexing */
-
-#ifdef AVL_COUNT
-extern unsigned int avl_count(const avl_tree_t *);
-extern avl_node_t *avl_get_node(const avl_tree_t *, unsigned int);
-extern unsigned int avl_index(const avl_node_t *);
-#endif
-#ifdef AVL_DEPTH
-extern unsigned int avl_depth(const avl_tree_t *);
-#endif
-
-#endif                                                 /* __AVL_TREE_H__ */