interesting
/
getdns
mirror of https://github.com/getdnsapi/getdns.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Map rbtree symbols

This commit is contained in:
Willem Toorop 2017-03-08 22:10:22 +01:00
parent 5f3de12644
commit ec685e900d
3 changed files with 316 additions and 260 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

152
src/util/rbtree.c
View File

@ -40,8 +40,8 @@
*/
#include "config.h"
#include "util/log.h"
#include "util/fptr_wlist.h"
#include "log.h"
#include "fptr_wlist.h"
#include "util/rbtree.h"
/** Node colour black */
@ -50,7 +50,7 @@
#define RED 1
/** the NULL node, global alloc */
_getdns_rbnode_t _getdns_rbtree_null_node = {
rbnode_type rbtree_null_node = {
RBTREE_NULL, /* Parent. */
RBTREE_NULL, /* Left. */
RBTREE_NULL, /* Right. */
@ -59,13 +59,14 @@ _getdns_rbnode_t _getdns_rbtree_null_node = {
};
/** rotate subtree left (to preserve redblack property) */
static void _getdns_rbtree_rotate_left(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node);
static void rbtree_rotate_left(rbtree_type *rbtree, rbnode_type *node);
/** rotate subtree right (to preserve redblack property) */
static void _getdns_rbtree_rotate_right(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node);
static void rbtree_rotate_right(rbtree_type *rbtree, rbnode_type *node);
/** Fixup node colours when insert happened */
static void _getdns_rbtree_insert_fixup(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node);
static void rbtree_insert_fixup(rbtree_type *rbtree, rbnode_type *node);
/** Fixup node colours when delete happened */
static void _getdns_rbtree_delete_fixup(_getdns_rbtree_t* rbtree, _getdns_rbnode_t* child, _getdns_rbnode_t* child_parent);
static void rbtree_delete_fixup(rbtree_type* rbtree, rbnode_type* child,
rbnode_type* child_parent);
/*
* Creates a new red black tree, initializes and returns a pointer to it.
@ -73,25 +74,25 @@ static void _getdns_rbtree_delete_fixup(_getdns_rbtree_t* rbtree, _getdns_rbnode
* Return NULL on failure.
*
*/
_getdns_rbtree_t *
_getdns_rbtree_create (int (*cmpf)(const void *, const void *))
rbtree_type *
rbtree_create (int (*cmpf)(const void *, const void *))
{
_getdns_rbtree_t *rbtree;
rbtree_type *rbtree;
/* Allocate memory for it */
rbtree = (_getdns_rbtree_t *) malloc(sizeof(_getdns_rbtree_t));
rbtree = (rbtree_type *) malloc(sizeof(rbtree_type));
if (!rbtree) {
return NULL;
}
/* Initialize it */
_getdns_rbtree_init(rbtree, cmpf);
rbtree_init(rbtree, cmpf);
return rbtree;
}
void
_getdns_rbtree_init(_getdns_rbtree_t *rbtree, int (*cmpf)(const void *, const void *))
rbtree_init(rbtree_type *rbtree, int (*cmpf)(const void *, const void *))
{
/* Initialize it */
rbtree->root = RBTREE_NULL;
@ -104,9 +105,9 @@ _getdns_rbtree_init(_getdns_rbtree_t *rbtree, int (*cmpf)(const void *, const vo
*
*/
static void
_getdns_rbtree_rotate_left(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
rbtree_rotate_left(rbtree_type *rbtree, rbnode_type *node)
{
_getdns_rbnode_t *right = node->right;
rbnode_type *right = node->right;
node->right = right->left;
if (right->left != RBTREE_NULL)
right->left->parent = node;
@ -131,9 +132,9 @@ _getdns_rbtree_rotate_left(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
*
*/
static void
_getdns_rbtree_rotate_right(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
rbtree_rotate_right(rbtree_type *rbtree, rbnode_type *node)
{
_getdns_rbnode_t *left = node->left;
rbnode_type *left = node->left;
node->left = left->right;
if (left->right != RBTREE_NULL)
left->right->parent = node;
@ -154,9 +155,9 @@ _getdns_rbtree_rotate_right(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
}
static void
_getdns_rbtree_insert_fixup(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
rbtree_insert_fixup(rbtree_type *rbtree, rbnode_type *node)
{
_getdns_rbnode_t *uncle;
rbnode_type *uncle;
/* While not at the root and need fixing... */
while (node != rbtree->root && node->parent->color == RED) {
@ -179,12 +180,12 @@ _getdns_rbtree_insert_fixup(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
/* Are we the right child? */
if (node == node->parent->right) {
node = node->parent;
_getdns_rbtree_rotate_left(rbtree, node);
rbtree_rotate_left(rbtree, node);
}
/* Now we're the left child, repaint and rotate... */
node->parent->color = BLACK;
node->parent->parent->color = RED;
_getdns_rbtree_rotate_right(rbtree, node->parent->parent);
rbtree_rotate_right(rbtree, node->parent->parent);
}
} else {
uncle = node->parent->parent->left;
@ -204,12 +205,12 @@ _getdns_rbtree_insert_fixup(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
/* Are we the right child? */
if (node == node->parent->left) {
node = node->parent;
_getdns_rbtree_rotate_right(rbtree, node);
rbtree_rotate_right(rbtree, node);
}
/* Now we're the right child, repaint and rotate... */
node->parent->color = BLACK;
node->parent->parent->color = RED;
_getdns_rbtree_rotate_left(rbtree, node->parent->parent);
rbtree_rotate_left(rbtree, node->parent->parent);
}
}
}
@ -223,17 +224,17 @@ _getdns_rbtree_insert_fixup(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *node)
* Returns NULL on failure or the pointer to the newly added node
* otherwise.
*/
_getdns_rbnode_t *
_getdns_rbtree_insert (_getdns_rbtree_t *rbtree, _getdns_rbnode_t *data)
rbnode_type *
rbtree_insert (rbtree_type *rbtree, rbnode_type *data)
{
/* XXX Not necessary, but keeps compiler quiet... */
int r = 0;
/* We start at the root of the tree */
_getdns_rbnode_t *node = rbtree->root;
_getdns_rbnode_t *parent = RBTREE_NULL;
rbnode_type *node = rbtree->root;
rbnode_type *parent = RBTREE_NULL;
fptr_ok(fptr_whitelist__getdns_rbtree_cmp(rbtree->cmp));
fptr_ok(fptr_whitelist_rbtree_cmp(rbtree->cmp));
/* Lets find the new parent... */
while (node != RBTREE_NULL) {
/* Compare two keys, do we have a duplicate? */
@ -267,7 +268,7 @@ _getdns_rbtree_insert (_getdns_rbtree_t *rbtree, _getdns_rbnode_t *data)
}
/* Fix up the red-black properties... */
_getdns_rbtree_insert_fixup(rbtree, data);
rbtree_insert_fixup(rbtree, data);
return data;
}
@ -276,12 +277,12 @@ _getdns_rbtree_insert (_getdns_rbtree_t *rbtree, _getdns_rbnode_t *data)
* Searches the red black tree, returns the data if key is found or NULL otherwise.
*
*/
_getdns_rbnode_t *
_getdns_rbtree_search (_getdns_rbtree_t *rbtree, const void *key)
rbnode_type *
rbtree_search (rbtree_type *rbtree, const void *key)
{
_getdns_rbnode_t *node;
rbnode_type *node;
if (_getdns_rbtree_find_less_equal(rbtree, key, &node)) {
if (rbtree_find_less_equal(rbtree, key, &node)) {
return node;
} else {
return NULL;
@ -295,13 +296,14 @@ static void swap_int8(uint8_t* x, uint8_t* y)
}
/** helpers for delete: swap node pointers */
static void swap_np(_getdns_rbnode_t** x, _getdns_rbnode_t** y)
static void swap_np(rbnode_type** x, rbnode_type** y)
{
_getdns_rbnode_t* t = *x; *x = *y; *y = t;
rbnode_type* t = *x; *x = *y; *y = t;
}
/** Update parent pointers of child trees of 'parent' */
static void change_parent_ptr(_getdns_rbtree_t* rbtree, _getdns_rbnode_t* parent, _getdns_rbnode_t* old, _getdns_rbnode_t* new)
static void change_parent_ptr(rbtree_type* rbtree, rbnode_type* parent,
rbnode_type* old, rbnode_type* new)
{
if(parent == RBTREE_NULL)
{
@ -315,30 +317,31 @@ static void change_parent_ptr(_getdns_rbtree_t* rbtree, _getdns_rbnode_t* parent
if(parent->right == old) parent->right = new;
}
/** Update parent pointer of a node 'child' */
static void change_child_ptr(_getdns_rbnode_t* child, _getdns_rbnode_t* old, _getdns_rbnode_t* new)
static void change_child_ptr(rbnode_type* child, rbnode_type* old,
rbnode_type* new)
{
if(child == RBTREE_NULL) return;
log_assert(child->parent == old || child->parent == new);
if(child->parent == old) child->parent = new;
}
_getdns_rbnode_t*
_getdns_rbtree_delete(_getdns_rbtree_t *rbtree, const void *key)
rbnode_type*
rbtree_delete(rbtree_type *rbtree, const void *key)
{
_getdns_rbnode_t *to_delete;
_getdns_rbnode_t *child;
if((to_delete = _getdns_rbtree_search(rbtree, key)) == 0) return 0;
rbnode_type *to_delete;
rbnode_type *child;
if((to_delete = rbtree_search(rbtree, key)) == 0) return 0;
rbtree->count--;
/* make sure we have at most one non-leaf child */
if(to_delete->left != RBTREE_NULL && to_delete->right != RBTREE_NULL)
{
/* swap with smallest from right subtree (or largest from left) */
_getdns_rbnode_t *smright = to_delete->right;
rbnode_type *smright = to_delete->right;
while(smright->left != RBTREE_NULL)
smright = smright->left;
/* swap the smright and to_delete elements in the tree,
* but the _getdns_rbnode_t is first part of user data struct
* but the rbnode_type is first part of user data struct
* so cannot just swap the keys and data pointers. Instead
* readjust the pointers left,right,parent */
@ -390,7 +393,7 @@ _getdns_rbtree_delete(_getdns_rbtree_t *rbtree, const void *key)
/* change child to BLACK, removing a RED node is no problem */
if(child!=RBTREE_NULL) child->color = BLACK;
}
else _getdns_rbtree_delete_fixup(rbtree, child, to_delete->parent);
else rbtree_delete_fixup(rbtree, child, to_delete->parent);
/* unlink completely */
to_delete->parent = RBTREE_NULL;
@ -400,9 +403,10 @@ _getdns_rbtree_delete(_getdns_rbtree_t *rbtree, const void *key)
return to_delete;
}
static void _getdns_rbtree_delete_fixup(_getdns_rbtree_t* rbtree, _getdns_rbnode_t* child, _getdns_rbnode_t* child_parent)
static void rbtree_delete_fixup(rbtree_type* rbtree, rbnode_type* child,
rbnode_type* child_parent)
{
_getdns_rbnode_t* sibling;
rbnode_type* sibling;
int go_up = 1;
/* determine sibling to the node that is one-black short */
@ -422,8 +426,8 @@ static void _getdns_rbtree_delete_fixup(_getdns_rbtree_t* rbtree, _getdns_rbnode
child_parent->color = RED;
sibling->color = BLACK;
if(child_parent->right == child)
_getdns_rbtree_rotate_right(rbtree, child_parent);
else _getdns_rbtree_rotate_left(rbtree, child_parent);
rbtree_rotate_right(rbtree, child_parent);
else rbtree_rotate_left(rbtree, child_parent);
/* new sibling after rotation */
if(child_parent->right == child) sibling = child_parent->left;
else sibling = child_parent->right;
@ -468,7 +472,7 @@ static void _getdns_rbtree_delete_fixup(_getdns_rbtree_t* rbtree, _getdns_rbnode
{
sibling->color = RED;
sibling->right->color = BLACK;
_getdns_rbtree_rotate_left(rbtree, sibling);
rbtree_rotate_left(rbtree, sibling);
/* new sibling after rotation */
if(child_parent->right == child) sibling = child_parent->left;
else sibling = child_parent->right;
@ -480,7 +484,7 @@ static void _getdns_rbtree_delete_fixup(_getdns_rbtree_t* rbtree, _getdns_rbnode
{
sibling->color = RED;
sibling->left->color = BLACK;
_getdns_rbtree_rotate_right(rbtree, sibling);
rbtree_rotate_right(rbtree, sibling);
/* new sibling after rotation */
if(child_parent->right == child) sibling = child_parent->left;
else sibling = child_parent->right;
@ -493,21 +497,22 @@ static void _getdns_rbtree_delete_fixup(_getdns_rbtree_t* rbtree, _getdns_rbnode
{
log_assert(sibling->left->color == RED);
sibling->left->color = BLACK;
_getdns_rbtree_rotate_right(rbtree, child_parent);
rbtree_rotate_right(rbtree, child_parent);
}
else
{
log_assert(sibling->right->color == RED);
sibling->right->color = BLACK;
_getdns_rbtree_rotate_left(rbtree, child_parent);
rbtree_rotate_left(rbtree, child_parent);
}
}
int
_getdns_rbtree_find_less_equal(_getdns_rbtree_t *rbtree, const void *key, _getdns_rbnode_t **result)
rbtree_find_less_equal(rbtree_type *rbtree, const void *key,
rbnode_type **result)
{
int r;
_getdns_rbnode_t *node;
rbnode_type *node;
log_assert(result);
@ -515,7 +520,7 @@ _getdns_rbtree_find_less_equal(_getdns_rbtree_t *rbtree, const void *key, _getdn
node = rbtree->root;
*result = NULL;
fptr_ok(fptr_whitelist__getdns_rbtree_cmp(rbtree->cmp));
fptr_ok(fptr_whitelist_rbtree_cmp(rbtree->cmp));
/* While there are children... */
while (node != RBTREE_NULL) {
@ -540,19 +545,19 @@ _getdns_rbtree_find_less_equal(_getdns_rbtree_t *rbtree, const void *key, _getdn
* Finds the first element in the red black tree
*
*/
_getdns_rbnode_t *
_getdns_rbtree_first (_getdns_rbtree_t *rbtree)
rbnode_type *
rbtree_first (rbtree_type *rbtree)
{
_getdns_rbnode_t *node;
rbnode_type *node;
for (node = rbtree->root; node->left != RBTREE_NULL; node = node->left);
return node;
}
_getdns_rbnode_t *
_getdns_rbtree_last (_getdns_rbtree_t *rbtree)
rbnode_type *
rbtree_last (rbtree_type *rbtree)
{
_getdns_rbnode_t *node;
rbnode_type *node;
for (node = rbtree->root; node->right != RBTREE_NULL; node = node->right);
return node;
@ -562,10 +567,10 @@ _getdns_rbtree_last (_getdns_rbtree_t *rbtree)
* Returns the next node...
*
*/
_getdns_rbnode_t *
_getdns_rbtree_next (_getdns_rbnode_t *node)
rbnode_type *
rbtree_next (rbnode_type *node)
{
_getdns_rbnode_t *parent;
rbnode_type *parent;
if (node->right != RBTREE_NULL) {
/* One right, then keep on going left... */
@ -581,10 +586,10 @@ _getdns_rbtree_next (_getdns_rbnode_t *node)
return node;
}
_getdns_rbnode_t *
_getdns_rbtree_previous(_getdns_rbnode_t *node)
rbnode_type *
rbtree_previous(rbnode_type *node)
{
_getdns_rbnode_t *parent;
rbnode_type *parent;
if (node->left != RBTREE_NULL) {
/* One left, then keep on going right... */
@ -602,19 +607,20 @@ _getdns_rbtree_previous(_getdns_rbnode_t *node)
/** recursive descent traverse */
static void
_getdns_traverse_post(void (*func)(_getdns_rbnode_t*, void*), void* arg, _getdns_rbnode_t* node)
traverse_post(void (*func)(rbnode_type*, void*), void* arg, rbnode_type* node)
{
if(!node || node == RBTREE_NULL)
return;
/* recurse */
_getdns_traverse_post(func, arg, node->left);
_getdns_traverse_post(func, arg, node->right);
traverse_post(func, arg, node->left);
traverse_post(func, arg, node->right);
/* call user func */
(*func)(node, arg);
}
void
_getdns_traverse_postorder(_getdns_rbtree_t* tree, void (*func)(_getdns_rbnode_t*, void*), void* arg)
traverse_postorder(rbtree_type* tree, void (*func)(rbnode_type*, void*),
void* arg)
{
_getdns_traverse_post(func, arg, tree->root);
traverse_post(func, arg, tree->root);
}

232
src/util/rbtree.h
View File

@ -1,192 +1,50 @@
/**
*
* \file rbtree.h
* /brief Alternative symbol names for unbound's rbtree.h
*
*/
/*
* rbtree.h -- generic red-black tree
* Copyright (c) 2017, NLnet Labs, the getdns team
* All rights reserved.
*
* Copyright (c) 2001-2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the names of the copyright holders nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL Verisign, Inc. BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
* Red black tree. Implementation taken from NSD 3.0.5, adjusted for use
* in unbound (memory allocation, logging and so on).
*/
#ifndef UTIL_RBTREE_H_
#define UTIL_RBTREE_H_
/**
* This structure must be the first member of the data structure in
* the rbtree. This allows easy casting between an _getdns_rbnode_t and the
* user data (poor man's inheritance).
*/
typedef struct _getdns_rbnode_t _getdns_rbnode_t;
/**
* The _getdns_rbnode_t struct definition.
*/
struct _getdns_rbnode_t {
/** parent in rbtree, RBTREE_NULL for root */
_getdns_rbnode_t *parent;
/** left node (smaller items) */
_getdns_rbnode_t *left;
/** right node (larger items) */
_getdns_rbnode_t *right;
/** pointer to sorting key */
const void *key;
/** colour of this node */
uint8_t color;
};
/** The nullpointer, points to empty node */
#define RBTREE_NULL &_getdns_rbtree_null_node
/** the global empty node */
extern _getdns_rbnode_t _getdns_rbtree_null_node;
/** An entire red black tree */
typedef struct _getdns_rbtree_t _getdns_rbtree_t;
/** definition for tree struct */
struct _getdns_rbtree_t {
/** The root of the red-black tree */
_getdns_rbnode_t *root;
/** The number of the nodes in the tree */
size_t count;
/**
* Key compare function. <0,0,>0 like strcmp.
* Return 0 on two NULL ptrs.
*/
int (*cmp) (const void *, const void *);
};
/**
* Create new tree (malloced) with given key compare function.
* @param cmpf: compare function (like strcmp) takes pointers to two keys.
* @return: new tree, empty.
*/
_getdns_rbtree_t *_getdns_rbtree_create(int (*cmpf)(const void *, const void *));
/**
* Init a new tree (malloced by caller) with given key compare function.
* @param rbtree: uninitialised memory for new tree, returned empty.
* @param cmpf: compare function (like strcmp) takes pointers to two keys.
*/
void _getdns_rbtree_init(_getdns_rbtree_t *rbtree, int (*cmpf)(const void *, const void *));
/**
* Insert data into the tree.
* @param rbtree: tree to insert to.
* @param data: element to insert.
* @return: data ptr or NULL if key already present.
*/
_getdns_rbnode_t *_getdns_rbtree_insert(_getdns_rbtree_t *rbtree, _getdns_rbnode_t *data);
/**
* Delete element from tree.
* @param rbtree: tree to delete from.
* @param key: key of item to delete.
* @return: node that is now unlinked from the tree. User to delete it.
* returns 0 if node not present
*/
_getdns_rbnode_t *_getdns_rbtree_delete(_getdns_rbtree_t *rbtree, const void *key);
/**
* Find key in tree. Returns NULL if not found.
* @param rbtree: tree to find in.
* @param key: key that must match.
* @return: node that fits or NULL.
*/
_getdns_rbnode_t *_getdns_rbtree_search(_getdns_rbtree_t *rbtree, const void *key);
/**
* Find, but match does not have to be exact.
* @param rbtree: tree to find in.
* @param key: key to find position of.
* @param result: set to the exact node if present, otherwise to element that
* precedes the position of key in the tree. NULL if no smaller element.
* @return: true if exact match in result. Else result points to <= element,
* or NULL if key is smaller than the smallest key.
*/
int _getdns_rbtree_find_less_equal(_getdns_rbtree_t *rbtree, const void *key,
_getdns_rbnode_t **result);
/**
* Returns first (smallest) node in the tree
* @param rbtree: tree
* @return: smallest element or NULL if tree empty.
*/
_getdns_rbnode_t *_getdns_rbtree_first(_getdns_rbtree_t *rbtree);
/**
* Returns last (largest) node in the tree
* @param rbtree: tree
* @return: largest element or NULL if tree empty.
*/
_getdns_rbnode_t *_getdns_rbtree_last(_getdns_rbtree_t *rbtree);
/**
* Returns next larger node in the tree
* @param rbtree: tree
* @return: next larger element or NULL if no larger in tree.
*/
_getdns_rbnode_t *_getdns_rbtree_next(_getdns_rbnode_t *rbtree);
/**
* Returns previous smaller node in the tree
* @param rbtree: tree
* @return: previous smaller element or NULL if no previous in tree.
*/
_getdns_rbnode_t *_getdns_rbtree_previous(_getdns_rbnode_t *rbtree);
/**
* Call with node=variable of struct* with _getdns_rbnode_t as first element.
* with type is the type of a pointer to that struct.
*/
#define RBTREE_FOR(node, type, rbtree) \
for(node=(type)_getdns_rbtree_first(rbtree); \
(_getdns_rbnode_t*)node != RBTREE_NULL; \
node = (type)_getdns_rbtree_next((_getdns_rbnode_t*)node))
/**
* Call function for all elements in the redblack tree, such that
* leaf elements are called before parent elements. So that all
* elements can be safely free()d.
* Note that your function must not remove the nodes from the tree.
* Since that may trigger rebalances of the rbtree.
* @param tree: the tree
* @param func: function called with element and user arg.
* The function must not alter the rbtree.
* @param arg: user argument.
*/
void _getdns_traverse_postorder(_getdns_rbtree_t* tree, void (*func)(_getdns_rbnode_t*, void*),
void* arg);
#endif /* UTIL_RBTREE_H_ */
#ifndef RBTREE_H_SYMBOLS
#define RBTREE_H_SYMBOLS
#define rbnode_type _getdns_rbnode_t
#define rbtree_null_node _getdns_rbtree_null_node
#define rbtree_type _getdns_rbtree_t
#define rbtree_create _getdns_rbtree_create
#define rbtree_init _getdns_rbtree_init
#define rbtree_insert _getdns_rbtree_insert
#define rbtree_delete _getdns_rbtree_delete
#define rbtree_search _getdns_rbtree_search
#define rbtree_find_less_equal _getdns_rbtree_find_less_equal
#define rbtree_first _getdns_rbtree_first
#define rbtree_last _getdns_rbtree_last
#define rbtree_next _getdns_rbtree_next
#define rbtree_previous _getdns_rbtree_previous
#define traverse_postorder _getdns_traverse_postorder
#include "util/ub/rbtree.h"
#endif

192
src/util/ub/rbtree.h Normal file
View File

@ -0,0 +1,192 @@
/*
* rbtree.h -- generic red-black tree
*
* Copyright (c) 2001-2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/**
* \file
* Red black tree. Implementation taken from NSD 3.0.5, adjusted for use
* in unbound (memory allocation, logging and so on).
*/
#ifndef UTIL_RBTREE_H_
#define UTIL_RBTREE_H_
/**
* This structure must be the first member of the data structure in
* the rbtree. This allows easy casting between an rbnode_type and the
* user data (poor man's inheritance).
*/
typedef struct rbnode_type rbnode_type;
/**
* The rbnode_type struct definition.
*/
struct rbnode_type {
/** parent in rbtree, RBTREE_NULL for root */
rbnode_type *parent;
/** left node (smaller items) */
rbnode_type *left;
/** right node (larger items) */
rbnode_type *right;
/** pointer to sorting key */
const void *key;
/** colour of this node */
uint8_t color;
};
/** The nullpointer, points to empty node */
#define RBTREE_NULL &rbtree_null_node
/** the global empty node */
extern rbnode_type rbtree_null_node;
/** An entire red black tree */
typedef struct rbtree_type rbtree_type;
/** definition for tree struct */
struct rbtree_type {
/** The root of the red-black tree */
rbnode_type *root;
/** The number of the nodes in the tree */
size_t count;
/**
* Key compare function. <0,0,>0 like strcmp.
* Return 0 on two NULL ptrs.
*/
int (*cmp) (const void *, const void *);
};
/**
* Create new tree (malloced) with given key compare function.
* @param cmpf: compare function (like strcmp) takes pointers to two keys.
* @return: new tree, empty.
*/
rbtree_type *rbtree_create(int (*cmpf)(const void *, const void *));
/**
* Init a new tree (malloced by caller) with given key compare function.
* @param rbtree: uninitialised memory for new tree, returned empty.
* @param cmpf: compare function (like strcmp) takes pointers to two keys.
*/
void rbtree_init(rbtree_type *rbtree, int (*cmpf)(const void *, const void *));
/**
* Insert data into the tree.
* @param rbtree: tree to insert to.
* @param data: element to insert.
* @return: data ptr or NULL if key already present.
*/
rbnode_type *rbtree_insert(rbtree_type *rbtree, rbnode_type *data);
/**
* Delete element from tree.
* @param rbtree: tree to delete from.
* @param key: key of item to delete.
* @return: node that is now unlinked from the tree. User to delete it.
* returns 0 if node not present
*/
rbnode_type *rbtree_delete(rbtree_type *rbtree, const void *key);
/**
* Find key in tree. Returns NULL if not found.
* @param rbtree: tree to find in.
* @param key: key that must match.
* @return: node that fits or NULL.
*/
rbnode_type *rbtree_search(rbtree_type *rbtree, const void *key);
/**
* Find, but match does not have to be exact.
* @param rbtree: tree to find in.
* @param key: key to find position of.
* @param result: set to the exact node if present, otherwise to element that
* precedes the position of key in the tree. NULL if no smaller element.
* @return: true if exact match in result. Else result points to <= element,
* or NULL if key is smaller than the smallest key.
*/
int rbtree_find_less_equal(rbtree_type *rbtree, const void *key,
rbnode_type **result);
/**
* Returns first (smallest) node in the tree
* @param rbtree: tree
* @return: smallest element or NULL if tree empty.
*/
rbnode_type *rbtree_first(rbtree_type *rbtree);
/**
* Returns last (largest) node in the tree
* @param rbtree: tree
* @return: largest element or NULL if tree empty.
*/
rbnode_type *rbtree_last(rbtree_type *rbtree);
/**
* Returns next larger node in the tree
* @param rbtree: tree
* @return: next larger element or NULL if no larger in tree.
*/
rbnode_type *rbtree_next(rbnode_type *rbtree);
/**
* Returns previous smaller node in the tree
* @param rbtree: tree
* @return: previous smaller element or NULL if no previous in tree.
*/
rbnode_type *rbtree_previous(rbnode_type *rbtree);
/**
* Call with node=variable of struct* with rbnode_type as first element.
* with type is the type of a pointer to that struct.
*/
#define RBTREE_FOR(node, type, rbtree) \
for(node=(type)rbtree_first(rbtree); \
(rbnode_type*)node != RBTREE_NULL; \
node = (type)rbtree_next((rbnode_type*)node))
/**
* Call function for all elements in the redblack tree, such that
* leaf elements are called before parent elements. So that all
* elements can be safely free()d.
* Note that your function must not remove the nodes from the tree.
* Since that may trigger rebalances of the rbtree.
* @param tree: the tree
* @param func: function called with element and user arg.
* The function must not alter the rbtree.
* @param arg: user argument.
*/
void traverse_postorder(rbtree_type* tree, void (*func)(rbnode_type*, void*),
void* arg);
#endif /* UTIL_RBTREE_H_ */