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Diffstat (limited to 'include/avl.h')
| -rw-r--r-- | include/avl.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/include/avl.h b/include/avl.h new file mode 100644 index 0000000..4c9efec --- /dev/null +++ b/include/avl.h @@ -0,0 +1,158 @@ +/* avl.h - avl tree definitions */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 1998-2018 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 */ |