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159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
/* avl.h - avl tree definitions */
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
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*
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* Copyright 1998-2010 The OpenLDAP Foundation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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/* Portions Copyright (c) 1993 Regents of the University of Michigan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of Michigan at Ann Arbor. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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#ifndef _AVL
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#define _AVL
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#include <ldap_cdefs.h>
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/*
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* this structure represents a generic avl tree node.
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*/
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LDAP_BEGIN_DECL
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typedef struct avlnode Avlnode;
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struct avlnode {
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void* avl_data;
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struct avlnode *avl_link[2];
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char avl_bits[2];
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signed char avl_bf;
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};
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#define avl_left avl_link[0]
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#define avl_right avl_link[1]
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#define avl_lbit avl_bits[0]
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#define avl_rbit avl_bits[1]
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#ifdef AVL_INTERNAL
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#define NULLAVL ((Avlnode *) NULL)
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/* balance factor values */
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#define LH (-1)
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#define EH 0
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#define RH 1
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#define avl_bf2str(bf) ((bf) == -1 ? "LH" : (bf) == 0 ? "EH" : (bf) == 1 ? "RH" : "(unknown)" )
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/* thread bits */
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#define AVL_THREAD 0
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#define AVL_CHILD 1
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/* avl routines */
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#define avl_getone(x) ((x) == 0 ? 0 : (x)->avl_data)
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#define avl_onenode(x) ((x) == 0 || ((x)->avl_left == 0 && (x)->avl_right == 0))
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#endif /* AVL_INTERNALS */
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#define avl_child(x,dir) ((x)->avl_bits[dir]) == AVL_CHILD ? \
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(x)->avl_link[dir] : NULL
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#define avl_lchild(x) avl_child(x,0)
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#define avl_rchild(x) avl_child(x,1)
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typedef int (*AVL_APPLY) LDAP_P((void *, void*));
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typedef int (*AVL_CMP) LDAP_P((const void*, const void*));
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typedef int (*AVL_DUP) LDAP_P((void*, void*));
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typedef void (*AVL_FREE) LDAP_P((void*));
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LDAP_AVL_F( int )
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avl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
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LDAP_AVL_F( int )
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avl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
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LDAP_AVL_F( void* )
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avl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
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LDAP_AVL_F( void* )
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avl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
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LDAP_AVL_F( Avlnode* )
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avl_find2 LDAP_P((Avlnode *, const void*, AVL_CMP));
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LDAP_AVL_F( void* )
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avl_find_lin LDAP_P((Avlnode *, const void*, AVL_CMP));
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#ifdef AVL_NONREENTRANT
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LDAP_AVL_F( void* )
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avl_getfirst LDAP_P((Avlnode *));
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LDAP_AVL_F( void* )
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avl_getnext LDAP_P((void));
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#endif
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LDAP_AVL_F( int )
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avl_dup_error LDAP_P((void*, void*));
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LDAP_AVL_F( int )
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avl_dup_ok LDAP_P((void*, void*));
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LDAP_AVL_F( int )
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avl_apply LDAP_P((Avlnode *, AVL_APPLY, void*, int, int));
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LDAP_AVL_F( int )
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avl_prefixapply LDAP_P((Avlnode *, void*, AVL_CMP, void*, AVL_CMP, void*, int));
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LDAP_AVL_F( int )
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tavl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
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LDAP_AVL_F( int )
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tavl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
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LDAP_AVL_F( void* )
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tavl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
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LDAP_AVL_F( void* )
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tavl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
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LDAP_AVL_F( Avlnode* )
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tavl_find2 LDAP_P((Avlnode *, const void*, AVL_CMP));
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LDAP_AVL_F( Avlnode* )
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tavl_find3 LDAP_P((Avlnode *, const void*, AVL_CMP, int *ret));
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#define TAVL_DIR_LEFT 0
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#define TAVL_DIR_RIGHT 1
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LDAP_AVL_F( Avlnode* )
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tavl_end LDAP_P((Avlnode *, int direction ));
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LDAP_AVL_F( Avlnode* )
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tavl_next LDAP_P((Avlnode *, int direction ));
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/* apply traversal types */
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#define AVL_PREORDER 1
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#define AVL_INORDER 2
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#define AVL_POSTORDER 3
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/* what apply returns if it ran out of nodes */
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#define AVL_NOMORE (-6)
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LDAP_END_DECL
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#endif /* _AVL */
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