3 * Copyright 1998-2000 The OpenLDAP Foundation, Redwood City, California, USA
6 * Redistribution and use in source and binary forms are permitted only
7 * as authorized by the OpenLDAP Public License. A copy of this
8 * license is available at http://www.OpenLDAP.org/license.html or
9 * in file LICENSE in the top-level directory of the distribution.
12 * Copyright (c) 1993 Regents of the University of Michigan.
13 * All rights reserved.
15 * Redistribution and use in source and binary forms are permitted
16 * provided that this notice is preserved and that due credit is given
17 * to the University of Michigan at Ann Arbor. The name of the University
18 * may not be used to endorse or promote products derived from this
19 * software without specific prior written permission. This software
20 * is provided ``as is'' without express or implied warranty.
22 /* avl.h - avl tree definitions */
28 #include <ldap_cdefs.h>
31 * this structure represents a generic avl tree node.
36 typedef struct avlnode Avlnode;
42 struct avlnode *avl_left;
43 struct avlnode *avl_right;
46 #define NULLAVL ((Avlnode *) NULL)
48 /* balance factor values */
54 #define avl_getone(x) ((x) == 0 ? 0 : (x)->avl_data)
55 #define avl_onenode(x) ((x) == 0 || ((x)->avl_left == 0 && (x)->avl_right == 0))
57 #endif /* AVL_INTERNALS */
59 typedef int (*AVL_APPLY) LDAP_P((void *, void*));
60 typedef int (*AVL_CMP) LDAP_P((const void*, const void*));
61 typedef int (*AVL_DUP) LDAP_P((void*, void*));
62 typedef void (*AVL_FREE) LDAP_P((void*));
65 avl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
68 avl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
71 avl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
74 avl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
77 avl_find_lin LDAP_P((Avlnode *, const void*, AVL_CMP));
79 #ifdef AVL_NONREENTRANT
81 avl_getfirst LDAP_P((Avlnode *));
84 avl_getnext LDAP_P((void));
88 avl_dup_error LDAP_P((void*, void*));
91 avl_dup_ok LDAP_P((void*, void*));
94 avl_apply LDAP_P((Avlnode *, AVL_APPLY, void*, int, int));
97 avl_prefixapply LDAP_P((Avlnode *, void*, AVL_CMP, void*, AVL_CMP, void*, int));
99 /* apply traversal types */
100 #define AVL_PREORDER 1
101 #define AVL_INORDER 2
102 #define AVL_POSTORDER 3
103 /* what apply returns if it ran out of nodes */
104 #define AVL_NOMORE (-6)