Current File : //backups/router/usr/local/include/iv_avl.h
/*
* ivykis, an event handling library
* Copyright (C) 2010 Lennert Buytenhek
* Dedicated to Marija Kulikova.
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version
* 2.1 as published by the Free Software Foundation.
*
* 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 version 2.1 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License version 2.1 along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __IV_AVL_H
#define __IV_AVL_H
#ifdef __cplusplus
extern "C" {
#endif
#include <inttypes.h>
struct iv_avl_node {
struct iv_avl_node *left;
struct iv_avl_node *right;
struct iv_avl_node *parent;
uint8_t height;
};
struct iv_avl_tree {
int (*compare)(const struct iv_avl_node *a,
const struct iv_avl_node *b);
struct iv_avl_node *root;
};
#define IV_AVL_TREE_INIT(comp) \
{ .compare = comp, .root = NULL }
#define INIT_IV_AVL_TREE(tree, comp) \
do { \
(tree)->compare = (comp); \
(tree)->root = NULL; \
} while (0)
int iv_avl_tree_insert(struct iv_avl_tree *tree, struct iv_avl_node *an);
void iv_avl_tree_delete(struct iv_avl_tree *tree, struct iv_avl_node *an);
struct iv_avl_node *iv_avl_tree_next(struct iv_avl_node *an);
struct iv_avl_node *iv_avl_tree_prev(struct iv_avl_node *an);
static inline int iv_avl_tree_empty(const struct iv_avl_tree *tree)
{
return tree->root == NULL;
}
static inline struct iv_avl_node *
iv_avl_tree_min(const struct iv_avl_tree *tree)
{
if (tree->root != NULL) {
struct iv_avl_node *an;
an = tree->root;
while (an->left != NULL)
an = an->left;
return an;
}
return NULL;
}
static inline struct iv_avl_node *
iv_avl_tree_max(const struct iv_avl_tree *tree)
{
if (tree->root != NULL) {
struct iv_avl_node *an;
an = tree->root;
while (an->right != NULL)
an = an->right;
return an;
}
return NULL;
}
#define iv_avl_tree_for_each(an, tree) \
for (an = iv_avl_tree_min(tree); an != NULL; an = iv_avl_tree_next(an))
static inline struct iv_avl_node *iv_avl_tree_next_safe(struct iv_avl_node *an)
{
return an != NULL ? iv_avl_tree_next(an) : NULL;
}
#define iv_avl_tree_for_each_safe(an, an2, tree) \
for (an = iv_avl_tree_min(tree), an2 = iv_avl_tree_next_safe(an); \
an != NULL; an = an2, an2 = iv_avl_tree_next_safe(an))
#ifdef __cplusplus
}
#endif
#endif
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