1 /* avl.h - avl tree definitions */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
5 * Copyright 1998-2009 The OpenLDAP Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
12 * A copy of this license is available in file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
16 /* Portions Copyright (c) 1993 Regents of the University of Michigan.
17 * All rights reserved.
19 * Redistribution and use in source and binary forms are permitted
20 * provided that this notice is preserved and that due credit is given
21 * to the University of Michigan at Ann Arbor. The name of the University
22 * may not be used to endorse or promote products derived from this
23 * software without specific prior written permission. This software
24 * is provided ``as is'' without express or implied warranty.
31 #include <ldap_cdefs.h>
34 * this structure represents a generic avl tree node.
39 typedef struct avlnode Avlnode;
43 struct avlnode *avl_link[2];
48 #define avl_left avl_link[0]
49 #define avl_right avl_link[1]
50 #define avl_lbit avl_bits[0]
51 #define avl_rbit avl_bits[1]
55 #define NULLAVL ((Avlnode *) NULL)
57 /* balance factor values */
62 #define avl_bf2str(bf) ((bf) == -1 ? "LH" : (bf) == 0 ? "EH" : (bf) == 1 ? "RH" : "(unknown)" )
69 #define avl_getone(x) ((x) == 0 ? 0 : (x)->avl_data)
70 #define avl_onenode(x) ((x) == 0 || ((x)->avl_left == 0 && (x)->avl_right == 0))
72 #endif /* AVL_INTERNALS */
74 #define avl_child(x,dir) ((x)->avl_bits[dir]) == AVL_CHILD ? \
75 (x)->avl_link[dir] : NULL
76 #define avl_lchild(x) avl_child(x,0)
77 #define avl_rchild(x) avl_child(x,1)
79 typedef int (*AVL_APPLY) LDAP_P((void *, void*));
80 typedef int (*AVL_CMP) LDAP_P((const void*, const void*));
81 typedef int (*AVL_DUP) LDAP_P((void*, void*));
82 typedef void (*AVL_FREE) LDAP_P((void*));
85 avl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
88 avl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
91 avl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
94 avl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
96 LDAP_AVL_F( Avlnode* )
97 avl_find2 LDAP_P((Avlnode *, const void*, AVL_CMP));
100 avl_find_lin LDAP_P((Avlnode *, const void*, AVL_CMP));
102 #ifdef AVL_NONREENTRANT
104 avl_getfirst LDAP_P((Avlnode *));
107 avl_getnext LDAP_P((void));
111 avl_dup_error LDAP_P((void*, void*));
114 avl_dup_ok LDAP_P((void*, void*));
117 avl_apply LDAP_P((Avlnode *, AVL_APPLY, void*, int, int));
120 avl_prefixapply LDAP_P((Avlnode *, void*, AVL_CMP, void*, AVL_CMP, void*, int));
123 tavl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
126 tavl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
129 tavl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
132 tavl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
134 LDAP_AVL_F( Avlnode* )
135 tavl_find2 LDAP_P((Avlnode *, const void*, AVL_CMP));
137 LDAP_AVL_F( Avlnode* )
138 tavl_find3 LDAP_P((Avlnode *, const void*, AVL_CMP, int *ret));
140 #define TAVL_DIR_LEFT 0
141 #define TAVL_DIR_RIGHT 1
143 LDAP_AVL_F( Avlnode* )
144 tavl_end LDAP_P((Avlnode *, int direction ));
146 LDAP_AVL_F( Avlnode* )
147 tavl_next LDAP_P((Avlnode *, int direction ));
149 /* apply traversal types */
150 #define AVL_PREORDER 1
151 #define AVL_INORDER 2
152 #define AVL_POSTORDER 3
153 /* what apply returns if it ran out of nodes */
154 #define AVL_NOMORE (-6)