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