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/*****************************************************************************
Copyright (c) 2007, 2015, Oracle and/or its affiliates. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/******************************************************************//**
@file include/ut0rbt.h
Various utilities
Created 2007-03-20 Sunny Bains
*******************************************************/
#ifndef INNOBASE_UT0RBT_H
#define INNOBASE_UT0RBT_H
#if !defined(IB_RBT_TESTING)
#include "ut0mem.h"
#else
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define ut_malloc malloc
#define ut_free free
#define ulint unsigned long
#define ut_a(c) assert(c)
#define ut_error assert(0)
#define ibool unsigned int
#define TRUE 1
#define FALSE 0
#endif
struct ib_rbt_node_t;
typedef void (*ib_rbt_print_node)(const ib_rbt_node_t* node);
typedef int (*ib_rbt_compare)(const void* p1, const void* p2);
typedef int (*ib_rbt_arg_compare)(const void*, const void* p1, const void* p2);
/** Red black tree color types */
enum ib_rbt_color_t {
IB_RBT_RED,
IB_RBT_BLACK
};
/** Red black tree node */
struct ib_rbt_node_t {
ib_rbt_color_t color; /* color of this node */
ib_rbt_node_t* left; /* points left child */
ib_rbt_node_t* right; /* points right child */
ib_rbt_node_t* parent; /* points parent node */
char value[1]; /* Data value */
};
/** Red black tree instance.*/
struct ib_rbt_t {
ib_rbt_node_t* nil; /* Black colored node that is
used as a sentinel. This is
pre-allocated too.*/
ib_rbt_node_t* root; /* Root of the tree, this is
pre-allocated and the first
data node is the left child.*/
ulint n_nodes; /* Total number of data nodes */
ib_rbt_compare compare; /* Fn. to use for comparison */
ib_rbt_arg_compare
compare_with_arg; /* Fn. to use for comparison
with argument */
ulint sizeof_value; /* Sizeof the item in bytes */
void* cmp_arg; /* Compare func argument */
};
/** The result of searching for a key in the tree, this is useful for
a speedy lookup and insert if key doesn't exist.*/
struct ib_rbt_bound_t {
const ib_rbt_node_t*
last; /* Last node visited */
int result; /* Result of comparing with
the last non-nil node that
was visited */
};
/* Size in elements (t is an rb tree instance) */
#define rbt_size(t) (t->n_nodes)
/* Check whether the rb tree is empty (t is an rb tree instance) */
#define rbt_empty(t) (rbt_size(t) == 0)
/* Get data value (t is the data type, n is an rb tree node instance) */
#define rbt_value(t, n) ((t*) &n->value[0])
/* Compare a key with the node value (t is tree, k is key, n is node)*/
#define rbt_compare(t, k, n) (t->compare(k, n->value))
/**********************************************************************//**
Free an instance of a red black tree */
void
rbt_free(
/*=====*/
ib_rbt_t* tree); /*!< in: rb tree to free */
/**********************************************************************//**
Create an instance of a red black tree
@return rb tree instance */
ib_rbt_t*
rbt_create(
/*=======*/
size_t sizeof_value, /*!< in: size in bytes */
ib_rbt_compare compare); /*!< in: comparator */
/**********************************************************************//**
Create an instance of a red black tree, whose comparison function takes
an argument
@return rb tree instance */
ib_rbt_t*
rbt_create_arg_cmp(
/*===============*/
size_t sizeof_value, /*!< in: size in bytes */
ib_rbt_arg_compare
compare, /*!< in: comparator */
void* cmp_arg); /*!< in: compare fn arg */
/**********************************************************************//**
Delete a node from the red black tree, identified by key */
ibool
rbt_delete(
/*=======*/
/* in: TRUE on success */
ib_rbt_t* tree, /* in: rb tree */
const void* key); /* in: key to delete */
/**********************************************************************//**
Remove a node from the red black tree, NOTE: This function will not delete
the node instance, THAT IS THE CALLERS RESPONSIBILITY.
@return the deleted node with the const. */
ib_rbt_node_t*
rbt_remove_node(
/*============*/
ib_rbt_t* tree, /*!< in: rb tree */
const ib_rbt_node_t*
node); /*!< in: node to delete, this
is a fudge and declared const
because the caller has access
only to const nodes.*/
/**********************************************************************//**
Add data to the red black tree, identified by key (no dups yet!)
@return inserted node */
const ib_rbt_node_t*
rbt_insert(
/*=======*/
ib_rbt_t* tree, /*!< in: rb tree */
const void* key, /*!< in: key for ordering */
const void* value); /*!< in: data that will be
copied to the node.*/
/**********************************************************************//**
Add a new node to the tree, useful for data that is pre-sorted.
@return appended node */
const ib_rbt_node_t*
rbt_add_node(
/*=========*/
ib_rbt_t* tree, /*!< in: rb tree */
ib_rbt_bound_t* parent, /*!< in: parent */
const void* value); /*!< in: this value is copied
to the node */
/**********************************************************************//**
Return the left most data node in the tree
@return left most node */
const ib_rbt_node_t*
rbt_first(
/*======*/
const ib_rbt_t* tree); /*!< in: rb tree */
/**********************************************************************//**
Return the right most data node in the tree
@return right most node */
const ib_rbt_node_t*
rbt_last(
/*=====*/
const ib_rbt_t* tree); /*!< in: rb tree */
/**********************************************************************//**
Return the next node from current.
@return successor node to current that is passed in. */
const ib_rbt_node_t*
rbt_next(
/*=====*/
const ib_rbt_t* tree, /*!< in: rb tree */
const ib_rbt_node_t* /* in: current node */
current);
/**********************************************************************//**
Return the prev node from current.
@return precedessor node to current that is passed in */
const ib_rbt_node_t*
rbt_prev(
/*=====*/
const ib_rbt_t* tree, /*!< in: rb tree */
const ib_rbt_node_t* /* in: current node */
current);
/**********************************************************************//**
Search for the key, a node will be retuned in parent.last, whether it
was found or not. If not found then parent.last will contain the
parent node for the possibly new key otherwise the matching node.
@return result of last comparison */
int
rbt_search(
/*=======*/
const ib_rbt_t* tree, /*!< in: rb tree */
ib_rbt_bound_t* parent, /*!< in: search bounds */
const void* key); /*!< in: key to search */
/**********************************************************************//**
Search for the key, a node will be retuned in parent.last, whether it
was found or not. If not found then parent.last will contain the
parent node for the possibly new key otherwise the matching node.
@return result of last comparison */
int
rbt_search_cmp(
/*===========*/
const ib_rbt_t* tree, /*!< in: rb tree */
ib_rbt_bound_t* parent, /*!< in: search bounds */
const void* key, /*!< in: key to search */
ib_rbt_compare compare, /*!< in: comparator */
ib_rbt_arg_compare
arg_compare); /*!< in: fn to compare items
with argument */
/**********************************************************************//**
Merge the node from dst into src. Return the number of nodes merged.
@return no. of recs merged */
ulint
rbt_merge_uniq(
/*===========*/
ib_rbt_t* dst, /*!< in: dst rb tree */
const ib_rbt_t* src); /*!< in: src rb tree */
#if defined UNIV_DEBUG || defined IB_RBT_TESTING
/**********************************************************************//**
Verify the integrity of the RB tree. For debugging. 0 failure else height
of tree (in count of black nodes).
@return TRUE if OK FALSE if tree invalid. */
ibool
rbt_validate(
/*=========*/
const ib_rbt_t* tree); /*!< in: tree to validate */
#endif /* UNIV_DEBUG || IB_RBT_TESTING */
#endif /* INNOBASE_UT0RBT_H */
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