You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
493 lines
10 KiB
C
493 lines
10 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
|
|
/*
|
|
* tree.c
|
|
* Copyright (C) 2006, 2013 Alexander Vdolainen <avdolainen@gmail.com>
|
|
* Copyright (C) 2006-2013, 2014 Askele inc. <http://askele.com>
|
|
*
|
|
* libtdata is free software: you can redistribute it and/or modify it
|
|
* under the terms of the GNU Lesser General Public License as published
|
|
* by the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* libtdata 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 for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.";
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <tdata/usrtc.h>
|
|
#include <tdata/macro.h>
|
|
#include <tdata/tree.h>
|
|
|
|
/*local functions prototypes*/
|
|
static void tree_delete(usrtc_t *, usrtc_node_t *);
|
|
|
|
usrtc_functions_t usrtc_tree_fu = {
|
|
usrtc_tree_init,
|
|
usrtc_tree_insert,
|
|
tree_delete,
|
|
usrtc_tree_lookup,
|
|
usrtc_tree_lower_bound,
|
|
usrtc_tree_upper_bound,
|
|
usrtc_tree_first,
|
|
usrtc_tree_last,
|
|
usrtc_tree_next,
|
|
usrtc_tree_prev,
|
|
usrtc_tree_convert_to_list,
|
|
usrtc_tree_convert_from_list,
|
|
usrtc_bst
|
|
};
|
|
|
|
/*implementation*/
|
|
|
|
void usrtc_tree_init(usrtc_t *us)
|
|
{
|
|
us->sentinel.left=&us->sentinel;
|
|
us->sentinel.right=&us->sentinel;
|
|
us->sentinel.parent=&us->sentinel;
|
|
|
|
us->sentinel.impl_specific.usrtc_dummy=0;
|
|
us->sentinel.data=0;
|
|
us->sentinel.key=0;
|
|
}
|
|
|
|
void usrtc_tree_insert(usrtc_t *us,usrtc_node_t *node,const void *key)
|
|
{
|
|
usrtc_node_t *where=tree_root_priv(us);
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *parent=nil;
|
|
long res=-1;
|
|
|
|
node->key=key;
|
|
|
|
while(where!=nil) {
|
|
parent=where;
|
|
res=us->compare(key,where->key);
|
|
|
|
if(us->dupes_allowed && !res) /*trying to put duplicate to the disabled dupe tree*/
|
|
return;
|
|
|
|
if(res<0)
|
|
where=where->left;
|
|
else
|
|
where=where->right;
|
|
}
|
|
|
|
/*assert(where==nil);*/
|
|
|
|
if(res<0)
|
|
parent->left=node;
|
|
else
|
|
parent->right=node;
|
|
|
|
node->parent=parent;
|
|
node->left=nil;
|
|
node->right=nil;
|
|
|
|
us->nodecount++;
|
|
}
|
|
|
|
void usrtc_tree_delete(usrtc_t *us,usrtc_node_t *node,usrtc_node_t **pswap,usrtc_node_t **pchild)
|
|
{
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *child;
|
|
usrtc_node_t *delparent=node->parent;
|
|
usrtc_node_t *next=node;
|
|
usrtc_node_t *nextparent;
|
|
|
|
if(node->left!=nil && node->right!=nil) {
|
|
next=usrtc_tree_next(us,node);
|
|
nextparent=next->parent;
|
|
|
|
/*if(next!=nil && next->parent!=nil && next->parent==nil)
|
|
return;*/
|
|
|
|
child=next->right;
|
|
child->parent=nextparent;
|
|
|
|
if(nextparent->left==next)
|
|
nextparent->left=child;
|
|
else {
|
|
//if(nextparent->right!=next)
|
|
//return;
|
|
nextparent->right=child;
|
|
}
|
|
|
|
next->parent=delparent;
|
|
next->left=node->left;
|
|
next->right=node->right;
|
|
next->left->parent=next;
|
|
next->right->parent=next;
|
|
|
|
if(delparent->left==node) {
|
|
delparent->left=next;
|
|
} else {
|
|
//if(delparent->right!=node)
|
|
// return;
|
|
delparent->right = next;
|
|
}
|
|
|
|
} else {
|
|
/*if(node==nil)
|
|
return;
|
|
if(node->left!=nil && node->right!=nil)
|
|
return;*/
|
|
|
|
child=(node->left!=nil) ? node->left : node->right;
|
|
|
|
child->parent=delparent=node->parent;
|
|
|
|
if(node==delparent->left) {
|
|
delparent->left=child;
|
|
} else {
|
|
/*if(node!=delparent->right)
|
|
return;*/
|
|
delparent->right=child;
|
|
}
|
|
}
|
|
|
|
node->parent=0;
|
|
node->right=0;
|
|
node->left=0;
|
|
|
|
us->nodecount--;
|
|
|
|
*pswap = next;
|
|
*pchild = child;
|
|
}
|
|
|
|
usrtc_node_t *usrtc_tree_lookup(usrtc_t *us,const void *key)
|
|
{
|
|
usrtc_node_t *root=tree_root_priv(us);
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *saved;
|
|
long res;
|
|
|
|
while (root!=nil) {
|
|
res=us->compare(key,root->key);
|
|
if(res<0)
|
|
root=root->left;
|
|
else if(res>0)
|
|
root=root->right;
|
|
else {
|
|
if(!us->dupes_allowed)
|
|
return root; /*no duplicates*/
|
|
else { /*duplicate, then find left occurence*/
|
|
do {
|
|
saved=root;
|
|
root=root->left;
|
|
while(root!=nil && us->compare(key,root->key))
|
|
root=root->right;
|
|
} while(root!=nil);
|
|
return saved;
|
|
}
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
usrtc_node_t *usrtc_tree_lower_bound(usrtc_t *us,const void *key)
|
|
{
|
|
usrtc_node_t *root=tree_root_priv(us);
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *tentative=NULL;
|
|
long res;
|
|
|
|
while(root!=nil) {
|
|
res=us->compare(key,root->key);
|
|
|
|
if(res>0) {
|
|
root=root->right;
|
|
} else if(res<0) {
|
|
tentative=root;
|
|
root=root->left;
|
|
} else {
|
|
if (!us->dupes_allowed)
|
|
return root;
|
|
else {
|
|
tentative=root;
|
|
root=root->left;
|
|
}
|
|
}
|
|
}
|
|
|
|
return tentative;
|
|
}
|
|
|
|
usrtc_node_t *usrtc_tree_upper_bound(usrtc_t *us,const void *key)
|
|
{
|
|
usrtc_node_t *root=tree_root_priv(us);
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *tentative=NULL;
|
|
long res;
|
|
|
|
while(root!=nil) {
|
|
res=us->compare(key,root->key);
|
|
|
|
if(res>0) {
|
|
root=root->left;
|
|
} else if(res<0) {
|
|
tentative=root;
|
|
root=root->right;
|
|
} else {
|
|
if (!us->dupes_allowed)
|
|
return root;
|
|
else {
|
|
tentative=root;
|
|
root=root->right;
|
|
}
|
|
}
|
|
}
|
|
|
|
return tentative;
|
|
}
|
|
|
|
usrtc_node_t *usrtc_tree_first(usrtc_t *us)
|
|
{
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *root=tree_root_priv(us);
|
|
usrtc_node_t *left;
|
|
|
|
if(root!=nil)
|
|
while((left=root->left)!=nil)
|
|
root=left;
|
|
|
|
return (root==nil) ? NULL : root;
|
|
}
|
|
|
|
usrtc_node_t *usrtc_tree_last(usrtc_t *us)
|
|
{
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *root=tree_root_priv(us);
|
|
usrtc_node_t *right;
|
|
|
|
if(root!=nil)
|
|
while((right=root->right)!=nil)
|
|
root=right;
|
|
|
|
return (root==nil) ? NULL : root;
|
|
}
|
|
|
|
usrtc_node_t *usrtc_tree_next(usrtc_t *us, usrtc_node_t *curr)
|
|
{
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *parent;
|
|
usrtc_node_t *left;
|
|
|
|
if(curr->right!=nil) {
|
|
curr=curr->right;
|
|
while((left=curr->left)!=nil)
|
|
curr=left;
|
|
return curr;
|
|
}
|
|
|
|
parent=curr->parent;
|
|
|
|
while(parent!=nil && curr==parent->right) {
|
|
curr=parent;
|
|
parent=curr->parent;
|
|
}
|
|
|
|
return (parent==nil) ? NULL : parent;
|
|
}
|
|
|
|
usrtc_node_t *usrtc_tree_prev(usrtc_t *us, usrtc_node_t *curr)
|
|
{
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *parent;
|
|
usrtc_node_t *right;
|
|
|
|
if(curr->left!=nil) {
|
|
curr=curr->left;
|
|
while((right=curr->right)!=nil)
|
|
curr=right;
|
|
return curr;
|
|
}
|
|
|
|
parent=curr->parent;
|
|
|
|
while(parent!=nil && curr==parent->left) {
|
|
curr=parent;
|
|
parent=curr->parent;
|
|
}
|
|
|
|
return (parent==nil) ? NULL : parent;
|
|
}
|
|
|
|
/*uff, convertation between trees and lists*/
|
|
void usrtc_tree_convert_to_list(usrtc_t *us)
|
|
{
|
|
usrtc_node_t *node;
|
|
usrtc_node_t tempsentinel;
|
|
usrtc_node_t *nil=&tempsentinel;
|
|
usrtc_node_t *tail,*next;
|
|
usrtc_node_t *treenil=tree_null_priv(us);
|
|
|
|
if(us->nodecount==0) /* no nodes */
|
|
return;
|
|
|
|
tempsentinel.next=nil;
|
|
tempsentinel.prev=nil;
|
|
|
|
/* two passes */
|
|
for(tail=nil,node=usrtc_tree_first(us);node!=0;tail=node,node=next) {
|
|
next=usrtc_tree_next(us,node);
|
|
node->prev=tail;
|
|
}
|
|
|
|
nil->prev=tail;
|
|
|
|
for(tail=nil,node=nil->prev;node!=nil;tail=node,node=node->prev)
|
|
node->next=tail;
|
|
|
|
nil->next=tail;
|
|
|
|
us->sentinel.next=tempsentinel.next;
|
|
us->sentinel.prev=tempsentinel.prev;
|
|
us->sentinel.next->prev=treenil;
|
|
us->sentinel.prev->next=treenil;
|
|
}
|
|
|
|
void usrtc_tree_convert_from_list(usrtc_t *us)
|
|
{
|
|
usrtc_node_t *tree[TREE_DEPTH_MAX]={ 0 };
|
|
usrtc_node_t *curr;
|
|
usrtc_node_t *nil=tree_null_priv(us);
|
|
usrtc_node_t *next;
|
|
usrtc_node_t *complete=NULL;
|
|
usrtc_count_t fullcount=(usrtc_count_t)USRTC_COUNT_T_MAX;
|
|
usrtc_count_t nodecount=us->nodecount;
|
|
usrtc_count_t botrowcount;
|
|
int baselevel=0;
|
|
int level=0;
|
|
int i=0;
|
|
|
|
while (fullcount>=nodecount && fullcount) /* calc */
|
|
fullcount>>=1;
|
|
|
|
botrowcount=nodecount-fullcount;
|
|
|
|
for(curr=nil->next;curr!=nil;curr=next) {
|
|
next=curr->next;
|
|
|
|
if(complete==NULL && botrowcount-- ==0) {
|
|
baselevel=level=1;
|
|
complete=tree[0];
|
|
|
|
if(complete!=NULL) {
|
|
tree[0]=0;
|
|
complete->right=nil;
|
|
while(tree[level]!=NULL) {
|
|
tree[level]->right=complete;
|
|
complete->parent=tree[level];
|
|
complete=tree[level];
|
|
tree[level++]=0;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(complete==NULL) {
|
|
curr->left=nil;
|
|
curr->right=nil;
|
|
complete=curr;
|
|
|
|
if(level!=baselevel)
|
|
return;
|
|
while(tree[level]!=NULL) {
|
|
tree[level]->right=complete;
|
|
complete->parent=tree[level];
|
|
complete=tree[level];
|
|
tree[level++]=0;
|
|
}
|
|
} else {
|
|
curr->left=complete;
|
|
complete->parent=curr;
|
|
tree[level]=curr;
|
|
complete=NULL;
|
|
level=baselevel;
|
|
}
|
|
}
|
|
|
|
if(complete==NULL)
|
|
complete=nil;
|
|
|
|
for(i=0;i<TREE_DEPTH_MAX;i++) {
|
|
if(tree[i]!=NULL) {
|
|
tree[i]->right=complete;
|
|
complete->parent=tree[i];
|
|
complete=tree[i];
|
|
}
|
|
}
|
|
|
|
nil->right=nil;
|
|
nil->left=complete;
|
|
complete->parent=nil;
|
|
|
|
}
|
|
|
|
void usrtc_tree_rotate_left(usrtc_node_t *child,usrtc_node_t *parent)
|
|
{
|
|
usrtc_node_t *leftgrandchild;
|
|
usrtc_node_t *grandpa;
|
|
|
|
if(parent->right!=child)
|
|
return;
|
|
|
|
child=parent->right;
|
|
parent->right=leftgrandchild=child->left;
|
|
leftgrandchild->parent=parent;
|
|
|
|
child->parent=grandpa=parent->parent;
|
|
|
|
if(parent==grandpa->left) {
|
|
grandpa->left=child;
|
|
} else {
|
|
if(parent!=grandpa->right)
|
|
return;
|
|
grandpa->right=child;
|
|
}
|
|
|
|
child->left=parent;
|
|
parent->parent=child;
|
|
}
|
|
|
|
void usrtc_tree_rotate_right(usrtc_node_t *child,usrtc_node_t *parent)
|
|
{
|
|
usrtc_node_t *rightgrandchild;
|
|
usrtc_node_t *grandpa;
|
|
|
|
if(parent->left!=child)
|
|
return;
|
|
|
|
parent->left=rightgrandchild=child->right;
|
|
rightgrandchild->parent=parent;
|
|
|
|
child->parent=grandpa=parent->parent;
|
|
|
|
if(parent==grandpa->right) {
|
|
grandpa->right=child;
|
|
} else {
|
|
if(parent!=grandpa->left)
|
|
return;
|
|
grandpa->left=child;
|
|
}
|
|
|
|
child->right=parent;
|
|
parent->parent=child;
|
|
}
|
|
|
|
/* local functions */
|
|
static void tree_delete(usrtc_t *us, usrtc_node_t *node)
|
|
{
|
|
usrtc_node_t *dummy;
|
|
|
|
usrtc_tree_delete(us, node, &dummy, &dummy);
|
|
}
|
|
|