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311 lines
7.3 KiB
C
311 lines
7.3 KiB
C
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 2 -*- */
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/*
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* redblack.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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#define color usrtc_impldata.usrtc_rb_color
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/*function prototypes*/
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static void redblack_init(usrtc_t *);
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static void redblack_insert(usrtc_t *, usrtc_node_t *, const void *);
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static void redblack_delete(usrtc_t *, usrtc_node_t *);
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static void redblack_convert_from_list(usrtc_t *);
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usrtc_functions_t usrtc_redblack_fu = {
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redblack_init,
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redblack_insert,
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redblack_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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redblack_convert_from_list,
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usrtc_bst
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};
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/*implementation*/
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static void redblack_init(usrtc_t *us)
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{
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usrtc_tree_init(us);
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us->sentinel.color = usrtc_black;
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}
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static void redblack_insert(usrtc_t *us, usrtc_node_t *node, const void *key)
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{
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usrtc_node_t *parent;
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/* simple bt insert */
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usrtc_tree_insert(us,node,key);
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/* implementation specific insert */
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node->color = usrtc_red;
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parent=node->parent;
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while(parent->color==usrtc_red) {
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usrtc_node_t *grandpa=parent->parent;
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if(parent==grandpa->left) {
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usrtc_node_t *uncle=grandpa->right;
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if(uncle->color==usrtc_red) { /*red parent->red uncle*/
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parent->color=usrtc_black;
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uncle->color=usrtc_black;
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grandpa->color=usrtc_red;
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node=grandpa;
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parent=grandpa->parent;
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} else { /*red parent->black uncle */
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if(node==parent->right) {
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usrtc_tree_rotate_left(node,parent);
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parent=node;
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if(grandpa!=parent->parent)
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return;
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}
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parent->color=usrtc_black;
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grandpa->color=usrtc_red;
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usrtc_tree_rotate_right(parent,grandpa);
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break;
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}
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} else { /*ooh,parent == parent->parent->right*/
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usrtc_node_t *uncle=grandpa->left;
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if(uncle->color==usrtc_red) {
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parent->color=usrtc_black;
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uncle->color=usrtc_black;
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grandpa->color=usrtc_red;
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node=grandpa;
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parent=grandpa->parent;
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} else {
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if(node==parent->left) {
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usrtc_tree_rotate_right(node,parent);
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parent=node;
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if(grandpa!=parent->parent)
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return;
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}
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parent->color=usrtc_black;
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grandpa->color=usrtc_red;
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usrtc_tree_rotate_left(parent,grandpa);
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break;
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}
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}
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}
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tree_root_priv(us)->color=usrtc_black;
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}
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static void redblack_delete(usrtc_t *us,usrtc_node_t *node)
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{
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usrtc_node_t *swap;
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usrtc_node_t *child;
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usrtc_rb_color_t savecolor;
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/*basic bt delete*/
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usrtc_tree_delete(us,node,&swap,&child);
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/*implementation specific deletion*/
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savecolor=node->color;
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node->color=swap->color;
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swap->color=savecolor;
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if(node->color==usrtc_black) { /*black*/
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usrtc_node_t *parent;
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usrtc_node_t *sister;
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tree_root_priv(us)->color=usrtc_red;
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while(child->color==usrtc_black) {
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parent=child->parent;
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if(child==parent->left) {
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sister=parent->right;
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if(sister==tree_null_priv(us))
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return;
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if(sister->color==usrtc_red) {
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sister->color=usrtc_black;
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parent->color=usrtc_red;
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usrtc_tree_rotate_left(sister,parent);
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sister=parent->right;
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if(sister==tree_null_priv(us))
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return;
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}
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if(sister->left->color==usrtc_black && sister->right->color==usrtc_black) {
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sister->color=usrtc_red;
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child=parent;
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} else {
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if(sister->right->color==usrtc_black) {
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if(sister->left->color!=usrtc_red)
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return;
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sister->left->color=usrtc_black;
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sister->color=usrtc_red;
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usrtc_tree_rotate_right(sister->left,sister);
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sister=parent->right;
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if(sister==tree_null_priv(us))
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return;
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}
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sister->color=parent->color;
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sister->right->color=usrtc_black;
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parent->color=usrtc_black;
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usrtc_tree_rotate_left(sister,parent);
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break;
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}
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} else { /*!child == child->parent->right*/
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if(child!=parent->right)
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return;
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sister=parent->left;
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if(sister==tree_null_priv(us))
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return;
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if(sister->color==usrtc_red) {
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sister->color=usrtc_black;
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parent->color=usrtc_red;
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usrtc_tree_rotate_right(sister,parent);
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sister = parent->left;
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if(sister==tree_null_priv(us))
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return;
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}
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if(sister->right->color==usrtc_black && sister->left->color==usrtc_black) {
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sister->color=usrtc_red;
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child=parent;
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} else {
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if(sister->left->color == usrtc_black) {
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if(sister->right->color!=usrtc_red)
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return;
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sister->right->color=usrtc_black;
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sister->color=usrtc_red;
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usrtc_tree_rotate_left(sister->right, sister);
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sister=parent->left;
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if(sister==tree_null_priv(us))
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return;
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}
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sister->color=parent->color;
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sister->left->color=usrtc_black;
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parent->color=usrtc_black;
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usrtc_tree_rotate_right(sister,parent);
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break;
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}
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}
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}
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child->color=usrtc_black;
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tree_root_priv(us)->color=usrtc_black;
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}
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}
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static void redblack_convert_from_list(usrtc_t *us)
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{
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usrtc_node_t *tree[TREE_DEPTH_MAX] = { NULL };
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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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unsigned int baselevel=0;
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unsigned int level=0;
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unsigned int i;
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if(usrtc_red!=0 && usrtc_black!=1)
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return;
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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]=NULL;
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complete->right=nil;
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while(tree[level]!=0) {
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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++]=NULL;
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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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curr->color=level%2;
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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++]=NULL;
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}
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} else {
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curr->left=complete;
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curr->color=(level+1)%2;
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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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nil->color=usrtc_black;
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complete->parent=nil;
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complete->color=usrtc_black;
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}
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