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/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas <matt@3am-software.com>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Based on NetBSD: rb.h,v 1.13 2009/08/16 10:57:01 yamt Exp
*/
#ifndef ARCHIVE_RB_H_INCLUDED
#define ARCHIVE_RB_H_INCLUDED
struct archive_rb_node {
struct archive_rb_node *rb_nodes[2];
/*
* rb_info contains the two flags and the parent back pointer.
* We put the two flags in the low two bits since we know that
* rb_node will have an alignment of 4 or 8 bytes.
*/
uintptr_t rb_info;
};
#define ARCHIVE_RB_DIR_LEFT 0
#define ARCHIVE_RB_DIR_RIGHT 1
#define ARCHIVE_RB_TREE_MIN(T) \
__archive_rb_tree_iterate((T), NULL, ARCHIVE_RB_DIR_LEFT)
#define ARCHIVE_RB_TREE_MAX(T) \
__archive_rb_tree_iterate((T), NULL, ARCHIVE_RB_DIR_RIGHT)
#define ARCHIVE_RB_TREE_NEXT(T, N) \
__archive_rb_tree_iterate((T), (N), ARCHIVE_RB_DIR_RIGHT)
#define ARCHIVE_RB_TREE_PREV(T, N) \
__archive_rb_tree_iterate((T), (N), ARCHIVE_RB_DIR_LEFT)
#define ARCHIVE_RB_TREE_FOREACH(N, T) \
for ((N) = ARCHIVE_RB_TREE_MIN(T); (N); \
(N) = ARCHIVE_RB_TREE_NEXT((T), (N)))
#define ARCHIVE_RB_TREE_FOREACH_REVERSE(N, T) \
for ((N) = ARCHIVE_RB_TREE_MAX(T); (N); \
(N) = ARCHIVE_RB_TREE_PREV((T), (N)))
#define ARCHIVE_RB_TREE_FOREACH_SAFE(N, T, S) \
for ((N) = ARCHIVE_RB_TREE_MIN(T); \
(N) && ((S) = ARCHIVE_RB_TREE_NEXT((T), (N)), 1); \
(N) = (S))
#define ARCHIVE_RB_TREE_FOREACH_REVERSE_SAFE(N, T, S) \
for ((N) = ARCHIVE_RB_TREE_MAX(T); \
(N) && ((S) = ARCHIVE_RB_TREE_PREV((T), (N)), 1); \
(N) = (S))
/*
* archive_rbto_compare_nodes_fn:
* return a positive value if the first node < the second node.
* return a negative value if the first node > the second node.
* return 0 if they are considered same.
*
* archive_rbto_compare_key_fn:
* return a positive value if the node < the key.
* return a negative value if the node > the key.
* return 0 if they are considered same.
*/
typedef signed int (*const archive_rbto_compare_nodes_fn)(const struct archive_rb_node *,
const struct archive_rb_node *);
typedef signed int (*const archive_rbto_compare_key_fn)(const struct archive_rb_node *,
const void *);
struct archive_rb_tree_ops {
archive_rbto_compare_nodes_fn rbto_compare_nodes;
archive_rbto_compare_key_fn rbto_compare_key;
};
struct archive_rb_tree {
struct archive_rb_node *rbt_root;
const struct archive_rb_tree_ops *rbt_ops;
};
void __archive_rb_tree_init(struct archive_rb_tree *,
const struct archive_rb_tree_ops *);
int __archive_rb_tree_insert_node(struct archive_rb_tree *,
struct archive_rb_node *);
struct archive_rb_node *
__archive_rb_tree_find_node(struct archive_rb_tree *, const void *);
struct archive_rb_node *
__archive_rb_tree_find_node_geq(struct archive_rb_tree *, const void *);
struct archive_rb_node *
__archive_rb_tree_find_node_leq(struct archive_rb_tree *, const void *);
void __archive_rb_tree_remove_node(struct archive_rb_tree *, struct archive_rb_node *);
struct archive_rb_node *
__archive_rb_tree_iterate(struct archive_rb_tree *,
struct archive_rb_node *, const unsigned int);
#endif /* ARCHIVE_RB_H_*/
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