193 lines
4.4 KiB
C
193 lines
4.4 KiB
C
/*
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This file is part of libcapwap.
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libcapwap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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libcapwap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file
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* @brief Yet another avl tree implementation!
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*/
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#ifndef __AVLTREE_H
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#define __AVLTREE_H
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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/** Maximum AVL Tree depth.
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The number of nodes is calculated by 2^depth.
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So a value of 32 should be enough for around 4
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billion nodes. */
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#define AVLTREE_MAX_DEPTH 32
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/**
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* Defines the structure of an AVL Node.
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*/
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struct mavlnode {
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void *data;
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struct mavlnode *left;
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struct mavlnode *right;
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int bal;
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};
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/**
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* AVL Tree
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*/
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struct mavl {
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struct mavlnode *root;
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int (*cmp) (const void *, const void *);
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void (*del) (void *);
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int count;
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};
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typedef struct mavl * mavl_t;
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//extern void mavlnode_destroy(struct mavl *t, struct mavlnode *n);
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struct mavl *mavl_create(int (*cmp) (const void *, const void *),
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void (*del) (void *));
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//void mavl_destroy(struct mavl *t);
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void mavl_del_all(struct mavl *t);
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void *mavl_del(struct mavl *t, void *data);
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void *mavl_add(struct mavl *t, void *data);
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void * mavl_get(struct mavl *t ,void *data);
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struct mavlnode *mavl_get_node(struct mavl *t, void *data);
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extern int mavl_foreach_lr(struct mavlnode *n, int (*callback) (void *, void *),
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void *cbpriv);
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extern int mavl_foreach_rl(struct mavlnode *n, int (*callback) (void *, void *),
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void *cbpriv);
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int mavl_foreach_from_lr(struct mavl *t, struct mavlnode *n, void *data,
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int (*callback) (void *, void *), void *cbpriv);
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//extern void mavl_foreach(struct mavl *t, int (*callback)(void *,void*),void *cbpriv,int dir);
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static inline void *mavl_replace_data(struct mavl *t, void *data, int len)
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{
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void *df = mavl_get(t, data);
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if (!df)
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return NULL;
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memcpy(df, data, len);
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return df;
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}
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static inline void *mavl_replace(struct mavl *t,void *data){
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struct mavlnode * node = mavl_get_node(t,data);
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if (node){
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t->del(node->data);
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return node->data=data;
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}
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return mavl_add(t,data);
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}
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static inline void mavl_destroy(struct mavl *t)
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{
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mavl_del_all(t);
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free (t);
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}
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#define mavl_find(t,d) mavl_get(t,d)
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#define mavl_insert(t,d) mavl_add(t,d)
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//#define mavl_walk(t,dir) mavl_foreach(t,dir)
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#define mavl_foreach_asc(t,cb,priv) mavl_foreach_lr((t)->root,cb,priv)
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#define mavl_foreach_desc(t,cb,priv) mavl_foreach_rl((t)->root,cb,priv)
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#define mavl_foreach_from_asc(t,d,cb,priv) mavl_foreach_from_lr(t,(t)->root,d,cb,priv);
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struct mavliter{
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struct mavlnode *stack[AVLTREE_MAX_DEPTH*2];
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struct mavlnode *cur;
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int stack_ptr;
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struct mavlnode * root;
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int (*cmp) (const void *, const void *);
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};
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typedef struct mavliter mavliter_t;
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void * mavliter_next(mavliter_t *i);
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static inline void * mavliter_seek_set(struct mavliter *i)
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{
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i->stack_ptr=0;
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i->cur=i->root;
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return mavliter_next(i);
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}
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/**
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* Init an AVL Tree Iterator.
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*
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* After initialization #mavliter_next would return the first element.
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* The behavior of #mavliter_get would still be undefined.
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* @param i AVL Iterator to initialize
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* @param t correspondending AVL Tree
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*
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* @See mavliter_t,
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*/
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static inline void mavliter_init(mavliter_t *i, mavl_t t){
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i->root = t->root;
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i->stack_ptr=0;
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i->cmp=t->cmp;
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}
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/**
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* Get the element, where AVL Iterator currently is positioned.
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* @param i AVL Iterator
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* @return element or NULL if not found.
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*/
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static inline void * mavliter_get(mavliter_t *i){
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if(!i->cur)
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return NULL;
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return i->cur->data;
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}
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extern void * mavliter_seek(mavliter_t *i,void *d);
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#define DEFINE_MAVLITER(i,t)\
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mavliter_t i; mavliter_init(&i,t)
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#define mavliter_foreach(i)\
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for (mavliter_seek_set(i); NULL != mavliter_get(i); mavliter_next(i))
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#define mavliter_foreach_from(i,from)\
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for (mavliter_seek(i,from); NULL != mavliter_get(i); mavliter_next(i))
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#define mavliter_foreach_asc(iter,val) \
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while(NULL != (val = mavliter_next(iter)))
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#endif
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