2 * Copyright 1998,1999 The OpenLDAP Foundation, Redwood City, California, USA
5 * Redistribution and use in source and binary forms are permitted only
6 * as authorized by the OpenLDAP Public License. A copy of this
7 * license is available at http://www.OpenLDAP.org/license.html or
8 * in file LICENSE in the top-level directory of the distribution.
11 * Copyright (c) 1993 Regents of the University of Michigan.
12 * All rights reserved.
14 * Redistribution and use in source and binary forms are permitted
15 * provided that this notice is preserved and that due credit is given
16 * to the University of Michigan at Ann Arbor. The name of the University
17 * may not be used to endorse or promote products derived from this
18 * software without specific prior written permission. This software
19 * is provided ``as is'' without express or implied warranty.
21 /* avl.h - avl tree definitions */
27 #include <ldap_cdefs.h>
30 * this structure represents a generic avl tree node.
35 typedef struct avlnode Avlnode;
41 struct avlnode *avl_left;
42 struct avlnode *avl_right;
45 #define NULLAVL ((Avlnode *) NULL)
47 /* balance factor values */
53 #define avl_getone(x) ((x) == 0 ? 0 : (x)->avl_data)
54 #define avl_onenode(x) ((x) == 0 || ((x)->avl_left == 0 && (x)->avl_right == 0))
56 #endif /* AVL_INTERNALS */
58 typedef int (*AVL_APPLY) LDAP_P((void *, void*));
59 typedef int (*AVL_CMP) LDAP_P((const void*, const void*));
60 typedef int (*AVL_DUP) LDAP_P((void*, void*));
61 typedef void (*AVL_FREE) LDAP_P((void*));
64 avl_free LDAP_P(( Avlnode *root, AVL_FREE dfree ));
67 avl_insert LDAP_P((Avlnode **, void*, AVL_CMP, AVL_DUP));
70 avl_delete LDAP_P((Avlnode **, void*, AVL_CMP));
73 avl_find LDAP_P((Avlnode *, const void*, AVL_CMP));
76 avl_find_lin LDAP_P((Avlnode *, const void*, AVL_CMP));
78 #ifdef AVL_NONREENTRANT
80 avl_getfirst LDAP_P((Avlnode *));
83 avl_getnext LDAP_P((void));
87 avl_dup_error LDAP_P((void*, void*));
90 avl_dup_ok LDAP_P((void*, void*));
93 avl_apply LDAP_P((Avlnode *, AVL_APPLY, void*, int, int));
96 avl_prefixapply LDAP_P((Avlnode *, void*, AVL_CMP, void*, AVL_CMP, void*, int));
98 /* apply traversal types */
99 #define AVL_PREORDER 1
100 #define AVL_INORDER 2
101 #define AVL_POSTORDER 3
102 /* what apply returns if it ran out of nodes */
103 #define AVL_NOMORE (-6)