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493 lines
10 KiB
C
493 lines
10 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
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/*
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* tree.c
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* Copyright (C) 2006, 2013 Alexander Vdolainen <avdolainen@zoho.com>
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* Copyright (C) 2006-2013, 2014 Askele inc. <http://askele.com>
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*
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* libtdata is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* libtdata is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.";
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*/
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#include <stdlib.h>
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#include <tdata/usrtc.h>
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#include <tdata/macro.h>
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#include <tdata/tree.h>
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/*local functions prototypes*/
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static void tree_delete(usrtc_t *, usrtc_node_t *);
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usrtc_functions_t usrtc_tree_fu = {
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usrtc_tree_init,
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usrtc_tree_insert,
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tree_delete,
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usrtc_tree_lookup,
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usrtc_tree_lower_bound,
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usrtc_tree_upper_bound,
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usrtc_tree_first,
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usrtc_tree_last,
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usrtc_tree_next,
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usrtc_tree_prev,
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usrtc_tree_convert_to_list,
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usrtc_tree_convert_from_list,
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usrtc_bst
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};
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/*implementation*/
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void usrtc_tree_init(usrtc_t *us)
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{
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us->sentinel.left=&us->sentinel;
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us->sentinel.right=&us->sentinel;
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us->sentinel.parent=&us->sentinel;
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us->sentinel.impl_specific.usrtc_dummy=0;
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us->sentinel.data=0;
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us->sentinel.key=0;
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}
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void usrtc_tree_insert(usrtc_t *us,usrtc_node_t *node,const void *key)
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{
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usrtc_node_t *where=tree_root_priv(us);
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *parent=nil;
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long res=-1;
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node->key=key;
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while(where!=nil) {
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parent=where;
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res=us->compare(key,where->key);
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if(us->dupes_allowed && !res) /*trying to put duplicate to the disabled dupe tree*/
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return;
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if(res<0)
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where=where->left;
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else
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where=where->right;
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}
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/*assert(where==nil);*/
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if(res<0)
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parent->left=node;
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else
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parent->right=node;
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node->parent=parent;
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node->left=nil;
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node->right=nil;
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us->nodecount++;
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}
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void usrtc_tree_delete(usrtc_t *us,usrtc_node_t *node,usrtc_node_t **pswap,usrtc_node_t **pchild)
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{
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *child;
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usrtc_node_t *delparent=node->parent;
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usrtc_node_t *next=node;
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usrtc_node_t *nextparent;
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if(node->left!=nil && node->right!=nil) {
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next=usrtc_tree_next(us,node);
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nextparent=next->parent;
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/*if(next!=nil && next->parent!=nil && next->parent==nil)
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return;*/
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child=next->right;
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child->parent=nextparent;
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if(nextparent->left==next)
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nextparent->left=child;
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else {
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//if(nextparent->right!=next)
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//return;
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nextparent->right=child;
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}
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next->parent=delparent;
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next->left=node->left;
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next->right=node->right;
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next->left->parent=next;
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next->right->parent=next;
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if(delparent->left==node) {
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delparent->left=next;
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} else {
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//if(delparent->right!=node)
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// return;
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delparent->right = next;
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}
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} else {
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/*if(node==nil)
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return;
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if(node->left!=nil && node->right!=nil)
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return;*/
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child=(node->left!=nil) ? node->left : node->right;
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child->parent=delparent=node->parent;
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if(node==delparent->left) {
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delparent->left=child;
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} else {
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/*if(node!=delparent->right)
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return;*/
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delparent->right=child;
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}
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}
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node->parent=0;
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node->right=0;
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node->left=0;
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us->nodecount--;
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*pswap = next;
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*pchild = child;
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}
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usrtc_node_t *usrtc_tree_lookup(usrtc_t *us,const void *key)
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{
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usrtc_node_t *root=tree_root_priv(us);
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *saved;
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long res;
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while (root!=nil) {
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res=us->compare(key,root->key);
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if(res<0)
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root=root->left;
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else if(res>0)
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root=root->right;
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else {
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if(!us->dupes_allowed)
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return root; /*no duplicates*/
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else { /*duplicate, then find left occurence*/
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do {
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saved=root;
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root=root->left;
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while(root!=nil && us->compare(key,root->key))
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root=root->right;
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} while(root!=nil);
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return saved;
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}
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}
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}
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return NULL;
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}
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usrtc_node_t *usrtc_tree_lower_bound(usrtc_t *us,const void *key)
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{
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usrtc_node_t *root=tree_root_priv(us);
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *tentative=NULL;
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long res;
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while(root!=nil) {
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res=us->compare(key,root->key);
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if(res>0) {
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root=root->right;
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} else if(res<0) {
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tentative=root;
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root=root->left;
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} else {
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if (!us->dupes_allowed)
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return root;
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else {
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tentative=root;
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root=root->left;
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}
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}
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}
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return tentative;
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}
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usrtc_node_t *usrtc_tree_upper_bound(usrtc_t *us,const void *key)
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{
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usrtc_node_t *root=tree_root_priv(us);
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *tentative=NULL;
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long res;
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while(root!=nil) {
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res=us->compare(key,root->key);
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if(res>0) {
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root=root->left;
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} else if(res<0) {
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tentative=root;
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root=root->right;
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} else {
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if (!us->dupes_allowed)
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return root;
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else {
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tentative=root;
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root=root->right;
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}
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}
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}
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return tentative;
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}
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usrtc_node_t *usrtc_tree_first(usrtc_t *us)
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{
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *root=tree_root_priv(us);
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usrtc_node_t *left;
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if(root!=nil)
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while((left=root->left)!=nil)
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root=left;
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return (root==nil) ? NULL : root;
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}
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usrtc_node_t *usrtc_tree_last(usrtc_t *us)
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{
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *root=tree_root_priv(us);
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usrtc_node_t *right;
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if(root!=nil)
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while((right=root->right)!=nil)
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root=right;
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return (root==nil) ? NULL : root;
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}
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usrtc_node_t *usrtc_tree_next(usrtc_t *us, usrtc_node_t *curr)
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{
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *parent;
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usrtc_node_t *left;
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if(curr->right!=nil) {
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curr=curr->right;
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while((left=curr->left)!=nil)
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curr=left;
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return curr;
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}
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parent=curr->parent;
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while(parent!=nil && curr==parent->right) {
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curr=parent;
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parent=curr->parent;
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}
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return (parent==nil) ? NULL : parent;
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}
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usrtc_node_t *usrtc_tree_prev(usrtc_t *us, usrtc_node_t *curr)
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{
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *parent;
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usrtc_node_t *right;
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if(curr->left!=nil) {
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curr=curr->left;
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while((right=curr->right)!=nil)
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curr=right;
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return curr;
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}
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parent=curr->parent;
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while(parent!=nil && curr==parent->left) {
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curr=parent;
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parent=curr->parent;
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}
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return (parent==nil) ? NULL : parent;
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}
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/*uff, convertation between trees and lists*/
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void usrtc_tree_convert_to_list(usrtc_t *us)
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{
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usrtc_node_t *node;
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usrtc_node_t tempsentinel;
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usrtc_node_t *nil=&tempsentinel;
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usrtc_node_t *tail,*next;
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usrtc_node_t *treenil=tree_null_priv(us);
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if(us->nodecount==0) /* no nodes */
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return;
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tempsentinel.next=nil;
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tempsentinel.prev=nil;
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/* two passes */
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for(tail=nil,node=usrtc_tree_first(us);node!=0;tail=node,node=next) {
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next=usrtc_tree_next(us,node);
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node->prev=tail;
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}
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nil->prev=tail;
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for(tail=nil,node=nil->prev;node!=nil;tail=node,node=node->prev)
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node->next=tail;
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nil->next=tail;
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us->sentinel.next=tempsentinel.next;
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us->sentinel.prev=tempsentinel.prev;
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us->sentinel.next->prev=treenil;
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us->sentinel.prev->next=treenil;
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}
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void usrtc_tree_convert_from_list(usrtc_t *us)
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{
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usrtc_node_t *tree[TREE_DEPTH_MAX]={ 0 };
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usrtc_node_t *curr;
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usrtc_node_t *nil=tree_null_priv(us);
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usrtc_node_t *next;
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usrtc_node_t *complete=NULL;
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usrtc_count_t fullcount=(usrtc_count_t)USRTC_COUNT_T_MAX;
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usrtc_count_t nodecount=us->nodecount;
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usrtc_count_t botrowcount;
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int baselevel=0;
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int level=0;
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int i=0;
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while (fullcount>=nodecount && fullcount) /* calc */
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fullcount>>=1;
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botrowcount=nodecount-fullcount;
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for(curr=nil->next;curr!=nil;curr=next) {
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next=curr->next;
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if(complete==NULL && botrowcount-- ==0) {
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baselevel=level=1;
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complete=tree[0];
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if(complete!=NULL) {
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tree[0]=0;
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complete->right=nil;
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while(tree[level]!=NULL) {
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tree[level]->right=complete;
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complete->parent=tree[level];
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complete=tree[level];
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tree[level++]=0;
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}
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}
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}
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if(complete==NULL) {
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curr->left=nil;
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curr->right=nil;
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complete=curr;
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if(level!=baselevel)
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return;
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while(tree[level]!=NULL) {
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tree[level]->right=complete;
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complete->parent=tree[level];
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complete=tree[level];
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tree[level++]=0;
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}
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} else {
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curr->left=complete;
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complete->parent=curr;
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tree[level]=curr;
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complete=NULL;
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level=baselevel;
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}
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}
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if(complete==NULL)
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complete=nil;
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for(i=0;i<TREE_DEPTH_MAX;i++) {
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if(tree[i]!=NULL) {
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tree[i]->right=complete;
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complete->parent=tree[i];
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complete=tree[i];
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}
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}
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nil->right=nil;
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nil->left=complete;
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complete->parent=nil;
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}
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void usrtc_tree_rotate_left(usrtc_node_t *child,usrtc_node_t *parent)
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{
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usrtc_node_t *leftgrandchild;
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usrtc_node_t *grandpa;
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if(parent->right!=child)
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return;
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child=parent->right;
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parent->right=leftgrandchild=child->left;
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leftgrandchild->parent=parent;
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child->parent=grandpa=parent->parent;
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if(parent==grandpa->left) {
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grandpa->left=child;
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} else {
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if(parent!=grandpa->right)
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return;
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grandpa->right=child;
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}
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child->left=parent;
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parent->parent=child;
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}
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void usrtc_tree_rotate_right(usrtc_node_t *child,usrtc_node_t *parent)
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{
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usrtc_node_t *rightgrandchild;
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usrtc_node_t *grandpa;
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if(parent->left!=child)
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return;
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parent->left=rightgrandchild=child->right;
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rightgrandchild->parent=parent;
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child->parent=grandpa=parent->parent;
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if(parent==grandpa->right) {
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grandpa->right=child;
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} else {
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if(parent!=grandpa->left)
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return;
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grandpa->left=child;
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}
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child->right=parent;
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parent->parent=child;
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}
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/* local functions */
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static void tree_delete(usrtc_t *us, usrtc_node_t *node)
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{
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usrtc_node_t *dummy;
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usrtc_tree_delete(us, node, &dummy, &dummy);
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}
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