85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
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/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef _tree_h
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#define _tree_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define MAX_TREE_HIGHT 40 /* = max 1048576 leafs in tree */
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#define ELEMENT_KEY(tree,element)\
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(tree->offset_to_key ? (void*)((byte*) element+tree->offset_to_key) :\
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*((void**) (element+1)))
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#define tree_set_pointer(element,ptr) *((byte **) (element+1))=((byte*) (ptr))
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typedef enum { left_root_right, right_root_left } TREE_WALK;
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typedef uint32 element_count;
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typedef int (*tree_walk_action)(void *,element_count,void *);
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typedef enum { free_init, free_free, free_end } TREE_FREE;
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typedef void (*tree_element_free)(void*, TREE_FREE, void *);
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#ifdef MSDOS
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typedef struct st_tree_element {
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struct st_tree_element *left,*right;
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unsigned long count;
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uchar colour; /* black is marked as 1 */
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} TREE_ELEMENT;
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#else
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typedef struct st_tree_element {
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struct st_tree_element *left,*right;
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uint32 count:31,
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colour:1; /* black is marked as 1 */
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} TREE_ELEMENT;
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#endif /* MSDOS */
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typedef struct st_tree {
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TREE_ELEMENT *root,null_element;
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TREE_ELEMENT **parents[MAX_TREE_HIGHT];
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uint offset_to_key,elements_in_tree,size_of_element,memory_limit,allocated;
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qsort_cmp2 compare;
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void* custom_arg;
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MEM_ROOT mem_root;
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my_bool with_delete;
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tree_element_free free;
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} TREE;
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/* Functions on whole tree */
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void init_tree(TREE *tree, uint default_alloc_size, uint memory_limit,
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int size, qsort_cmp2 compare, my_bool with_delete,
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tree_element_free free_element, void *custom_arg);
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void delete_tree(TREE*);
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void reset_tree(TREE*);
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/* similar to delete tree, except we do not my_free() blocks in mem_root
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*/
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#define is_tree_inited(tree) ((tree)->root != 0)
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/* Functions on leafs */
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TREE_ELEMENT *tree_insert(TREE *tree,void *key,uint key_size);
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void *tree_search(TREE *tree,void *key);
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int tree_walk(TREE *tree,tree_walk_action action,
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void *argument, TREE_WALK visit);
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int tree_delete(TREE *tree,void *key);
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#define TREE_ELEMENT_EXTRA_SIZE (sizeof(TREE_ELEMENT) + sizeof(void*))
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#ifdef __cplusplus
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}
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#endif
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#endif
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