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2b5702030d
Sometimes it's very useful to visit duplicates of a same node, but doing so from the application is not convenient because keys have to be compared, while all the information is available during the next/prev steps. Let's introduce a couple of new eb_next_dup/eb_prev_dup functions to visit only duplicates of the current node and return NULL once it's done. Now we have all 3 combinations : - next : returns next node in the tree - next_dup : returns next dup in the sub-tree - next_unique : returns next value after skipping dups (cherry picked from commit 3327b8ae6866f3878322a1a29e70b450226d216d)
178 lines
5.8 KiB
C
178 lines
5.8 KiB
C
/*
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* Elastic Binary Trees - macros and structures for operations on pointer nodes.
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* Version 6.0.6
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* (C) 2002-2011 - Willy Tarreau <w@1wt.eu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _EBPTTREE_H
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#define _EBPTTREE_H
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#include "ebtree.h"
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#include "eb32tree.h"
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#include "eb64tree.h"
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/* Return the structure of type <type> whose member <member> points to <ptr> */
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#define ebpt_entry(ptr, type, member) container_of(ptr, type, member)
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#define EBPT_ROOT EB_ROOT
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#define EBPT_TREE_HEAD EB_TREE_HEAD
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/* on *almost* all platforms, a pointer can be cast into a size_t which is unsigned */
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#ifndef PTR_INT_TYPE
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#define PTR_INT_TYPE size_t
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#endif
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typedef PTR_INT_TYPE ptr_t;
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/* This structure carries a node, a leaf, and a key. It must start with the
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* eb_node so that it can be cast into an eb_node. We could also have put some
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* sort of transparent union here to reduce the indirection level, but the fact
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* is, the end user is not meant to manipulate internals, so this is pointless.
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* Internally, it is automatically cast as an eb32_node or eb64_node.
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*/
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struct ebpt_node {
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struct eb_node node; /* the tree node, must be at the beginning */
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void *key;
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};
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/*
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* Exported functions and macros.
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* Many of them are always inlined because they are extremely small, and
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* are generally called at most once or twice in a program.
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*/
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/* Return leftmost node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_first(struct eb_root *root)
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{
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return ebpt_entry(eb_first(root), struct ebpt_node, node);
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}
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/* Return rightmost node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_last(struct eb_root *root)
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{
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return ebpt_entry(eb_last(root), struct ebpt_node, node);
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}
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/* Return next node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_next(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_next(&ebpt->node), struct ebpt_node, node);
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}
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/* Return previous node in the tree, or NULL if none */
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static forceinline struct ebpt_node *ebpt_prev(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_prev(&ebpt->node), struct ebpt_node, node);
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}
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/* Return next leaf node within a duplicate sub-tree, or NULL if none. */
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static inline struct ebpt_node *ebpt_next_dup(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_next_dup(&ebpt->node), struct ebpt_node, node);
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}
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/* Return previous leaf node within a duplicate sub-tree, or NULL if none. */
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static inline struct ebpt_node *ebpt_prev_dup(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_prev_dup(&ebpt->node), struct ebpt_node, node);
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}
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/* Return next node in the tree, skipping duplicates, or NULL if none */
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static forceinline struct ebpt_node *ebpt_next_unique(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_next_unique(&ebpt->node), struct ebpt_node, node);
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}
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/* Return previous node in the tree, skipping duplicates, or NULL if none */
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static forceinline struct ebpt_node *ebpt_prev_unique(struct ebpt_node *ebpt)
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{
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return ebpt_entry(eb_prev_unique(&ebpt->node), struct ebpt_node, node);
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}
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/* Delete node from the tree if it was linked in. Mark the node unused. Note
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* that this function relies on a non-inlined generic function: eb_delete.
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*/
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static forceinline void ebpt_delete(struct ebpt_node *ebpt)
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{
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eb_delete(&ebpt->node);
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}
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/*
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* The following functions are inlined but derived from the integer versions.
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*/
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static forceinline struct ebpt_node *ebpt_lookup(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_lookup(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)eb64_lookup(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *ebpt_lookup_le(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_lookup_le(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)eb64_lookup_le(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *ebpt_lookup_ge(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_lookup_ge(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)eb64_lookup_ge(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *ebpt_insert(struct eb_root *root, struct ebpt_node *new)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)eb32_insert(root, (struct eb32_node *)new);
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else
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return (struct ebpt_node *)eb64_insert(root, (struct eb64_node *)new);
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}
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/*
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* The following functions are less likely to be used directly, because
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* their code is larger. The non-inlined version is preferred.
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*/
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/* Delete node from the tree if it was linked in. Mark the node unused. */
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static forceinline void __ebpt_delete(struct ebpt_node *ebpt)
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{
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__eb_delete(&ebpt->node);
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}
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static forceinline struct ebpt_node *__ebpt_lookup(struct eb_root *root, void *x)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)__eb32_lookup(root, (u32)(PTR_INT_TYPE)x);
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else
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return (struct ebpt_node *)__eb64_lookup(root, (u64)(PTR_INT_TYPE)x);
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}
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static forceinline struct ebpt_node *__ebpt_insert(struct eb_root *root, struct ebpt_node *new)
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{
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if (sizeof(void *) == 4)
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return (struct ebpt_node *)__eb32_insert(root, (struct eb32_node *)new);
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else
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return (struct ebpt_node *)__eb64_insert(root, (struct eb64_node *)new);
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}
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#endif /* _EBPT_TREE_H */
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