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/* Produced by texiweb from libavl.w. */
/* libavl - library for manipulation of binary trees.
Copyright (C) 2004-2011 Han The Thanh, <thanh@pdftex.org>
Modified for pdfTeX, contact pdfTeX maintainers with any problems or
questions, not the original authors.
Copyright (C) 1998-2002, 2004 Free Software Foundation, Inc.
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; either version 2 of the
License, or (at your option) any later version.
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., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
Original author: Ben Pfaff.
*/
#ifndef AVL_H
#define AVL_H 1
#include <stddef.h>
/* Function types. */
typedef int avl_comparison_func (const void *avl_a, const void *avl_b,
void *avl_param);
typedef void avl_item_func (void *avl_item, void *avl_param);
typedef void *avl_copy_func (void *avl_item, void *avl_param);
#ifndef LIBAVL_ALLOCATOR
#define LIBAVL_ALLOCATOR
/* Memory allocator. */
struct libavl_allocator
{
void *(*libavl_malloc) (struct libavl_allocator *, size_t libavl_size);
void (*libavl_free) (struct libavl_allocator *, void *libavl_block);
};
#endif
/* Default memory allocator. */
extern struct libavl_allocator avl_allocator_default;
void *avl_malloc (struct libavl_allocator *, size_t);
void avl_free (struct libavl_allocator *, void *);
/* Maximum AVL height. */
#ifndef AVL_MAX_HEIGHT
#define AVL_MAX_HEIGHT 32
#endif
/* Tree data structure. */
struct avl_table
{
struct avl_node *avl_root; /* Tree's root. */
avl_comparison_func *avl_compare; /* Comparison function. */
void *avl_param; /* Extra argument to |avl_compare|. */
struct libavl_allocator *avl_alloc; /* Memory allocator. */
size_t avl_count; /* Number of items in tree. */
unsigned long avl_generation; /* Generation number. */
};
/* An AVL tree node. */
struct avl_node
{
struct avl_node *avl_link[2]; /* Subtrees. */
void *avl_data; /* Pointer to data. */
signed char avl_balance; /* Balance factor. */
};
/* AVL traverser structure. */
struct avl_traverser
{
struct avl_table *avl_table; /* Tree being traversed. */
struct avl_node *avl_node; /* Current node in tree. */
struct avl_node *avl_stack[AVL_MAX_HEIGHT];
/* All the nodes above |avl_node|. */
size_t avl_height; /* Number of nodes in |avl_parent|. */
unsigned long avl_generation; /* Generation number. */
};
/* Table functions. */
struct avl_table *avl_create (avl_comparison_func *, void *,
struct libavl_allocator *);
struct avl_table *avl_copy (const struct avl_table *, avl_copy_func *,
avl_item_func *, struct libavl_allocator *);
void avl_destroy (struct avl_table *, avl_item_func *);
void **avl_probe (struct avl_table *, void *);
void *avl_insert (struct avl_table *, void *);
void *avl_replace (struct avl_table *, void *);
void *avl_delete (struct avl_table *, const void *);
void *avl_find (const struct avl_table *, const void *);
void avl_assert_insert (struct avl_table *, void *);
void *avl_assert_delete (struct avl_table *, void *);
#define avl_count(table) ((size_t) (table)->avl_count)
/* Table traverser functions. */
void avl_t_init (struct avl_traverser *, struct avl_table *);
void *avl_t_first (struct avl_traverser *, struct avl_table *);
void *avl_t_last (struct avl_traverser *, struct avl_table *);
void *avl_t_find (struct avl_traverser *, struct avl_table *, void *);
void *avl_t_insert (struct avl_traverser *, struct avl_table *, void *);
void *avl_t_copy (struct avl_traverser *, const struct avl_traverser *);
void *avl_t_next (struct avl_traverser *);
void *avl_t_prev (struct avl_traverser *);
void *avl_t_cur (struct avl_traverser *);
void *avl_t_replace (struct avl_traverser *, void *);
#endif /* avl.h */
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