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/* avl.h - avl tree definitions */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2021 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* Portions Copyright (c) 1993 Regents of the University of Michigan.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of Michigan at Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#ifndef _AVL
#define _AVL
#include <ldap_cdefs.h>
/*
* this structure represents a generic avl tree node.
*/
LDAP_BEGIN_DECL
typedef struct avlnode Avlnode;
struct avlnode {
void* avl_data;
struct avlnode *avl_link[2];
char avl_bits[2];
signed char avl_bf;
};
#define avl_left avl_link[0]
#define avl_right avl_link[1]
#define avl_lbit avl_bits[0]
#define avl_rbit avl_bits[1]
#ifdef AVL_INTERNAL
#define NULLAVL ((Avlnode *) NULL)
/* balance factor values */
#define LH (-1)
#define EH 0
#define RH 1
#define avl_bf2str(bf) ((bf) == -1 ? "LH" : (bf) == 0 ? "EH" : (bf) == 1 ? "RH" : "(unknown)" )
/* thread bits */
#define AVL_THREAD 0
#define AVL_CHILD 1
/* avl routines */
#define avl_getone(x) ((x) == 0 ? 0 : (x)->avl_data)
#define avl_onenode(x) ((x) == 0 || ((x)->avl_left == 0 && (x)->avl_right == 0))
#endif /* AVL_INTERNALS */
#define avl_child(x,dir) ((x)->avl_bits[dir]) == AVL_CHILD ? \
(x)->avl_link[dir] : NULL
#define avl_lchild(x) avl_child(x,0)
#define avl_rchild(x) avl_child(x,1)
typedef int (*AVL_APPLY) LDAP_P((void *, void*));
typedef int (*AVL_CMP) LDAP_P((const void*, const void*));
typedef int (*AVL_DUP) LDAP_P((void*, void*));
typedef void (*AVL_FREE) LDAP_P((void*));
LDAP_AVL_F( int )
avl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
LDAP_AVL_F( int )
avl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
LDAP_AVL_F( void* )
avl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
LDAP_AVL_F( void* )
avl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
LDAP_AVL_F( Avlnode* )
avl_find2 LDAP_P((Avlnode *, const void*, AVL_CMP));
LDAP_AVL_F( void* )
avl_find_lin LDAP_P((Avlnode *, const void*, AVL_CMP));
#ifdef AVL_NONREENTRANT
LDAP_AVL_F( void* )
avl_getfirst LDAP_P((Avlnode *));
LDAP_AVL_F( void* )
avl_getnext LDAP_P((void));
#endif
LDAP_AVL_F( int )
avl_dup_error LDAP_P((void*, void*));
LDAP_AVL_F( int )
avl_dup_ok LDAP_P((void*, void*));
LDAP_AVL_F( int )
avl_apply LDAP_P((Avlnode *, AVL_APPLY, void*, int, int));
LDAP_AVL_F( int )
avl_prefixapply LDAP_P((Avlnode *, void*, AVL_CMP, void*, AVL_CMP, void*, int));
LDAP_AVL_F( int )
tavl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
LDAP_AVL_F( int )
tavl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
LDAP_AVL_F( void* )
tavl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
LDAP_AVL_F( void* )
tavl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
LDAP_AVL_F( Avlnode* )
tavl_find2 LDAP_P((Avlnode *, const void*, AVL_CMP));
LDAP_AVL_F( Avlnode* )
tavl_find3 LDAP_P((Avlnode *, const void*, AVL_CMP, int *ret));
#define TAVL_DIR_LEFT 0
#define TAVL_DIR_RIGHT 1
LDAP_AVL_F( Avlnode* )
tavl_end LDAP_P((Avlnode *, int direction ));
LDAP_AVL_F( Avlnode* )
tavl_next LDAP_P((Avlnode *, int direction ));
/* apply traversal types */
#define AVL_PREORDER 1
#define AVL_INORDER 2
#define AVL_POSTORDER 3
/* what apply returns if it ran out of nodes */
#define AVL_NOMORE (-6)
LDAP_END_DECL
#endif /* _AVL */
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