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ddf900a0ce
The support for duplicates is necessary for various use cases related
to config names, so let's upgrade to the latest version which brings
this support. This updates the cebtree code to commit 808ed67 (tag
0.5.0). A few tiny adaptations were needed:
- replace a few ceb_node** with ceb_root** since pointers are now
tagged ;
- replace cebu*.h with ceb*.h since both are now merged in the same
include file. This way we can drop the unused cebu*.h files from
cebtree that are provided only for compatibility.
- rename immediate storage functions to cebXX_imm_XXX() as per the API
change in 0.5 that makes immediate explicit rather than implicit.
This only affects vars and tools.c:copy_file_name().
The tests continue to work.
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
/*
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* Compact Elastic Binary Trees - exported functions operating on node's address
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*
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* Copyright (C) 2014-2024 Willy Tarreau - w@1wt.eu
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _CEBTREE_H
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#define _CEBTREE_H
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#include <stddef.h>
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/* offsetof() is provided as a builtin starting with gcc-4.1 */
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#ifndef offsetof
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# if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
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# define offsetof(type, field) __builtin_offsetof(type, field)
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# else
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# define offsetof(type, field) ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
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# endif
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#endif
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/* Linux-like "container_of". It returns a pointer to the structure of type
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* <type> which has its member <name> stored at address <ptr>.
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*/
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#ifndef container_of
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#define container_of(ptr, type, name) ((type *)(((char *)(ptr)) - offsetof(type, name)))
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#endif
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/* returns a pointer to the structure of type <type> which has its member <name>
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* stored at address <ptr>, unless <ptr> is 0, in which case 0 is returned.
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*/
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#ifndef container_of_safe
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#define container_of_safe(ptr, type, name) \
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({ void *__p = (ptr); \
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__p ? container_of(__p, type, name) : (type *)0; \
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})
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#endif
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/* This is what a tagged pointer points to, as found on the root or any branch.
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* It's only a forward declaration so that it is never directly dereferenced.
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*/
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struct ceb_root;
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/* Standard node when using absolute pointers */
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struct ceb_node {
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struct ceb_root *b[2]; /* branches: 0=left, 1=right */
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};
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/* initializes a root as an empty tree */
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static inline void ceb_init_root(struct ceb_root **root)
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{
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*root = NULL;
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}
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/* initializes a node as not belonging to a tree */
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static inline void ceb_init_node(struct ceb_node *node)
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{
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node->b[0] = NULL;
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}
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/* indicates whether a valid node is in a tree or not */
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static inline int ceb_intree(const struct ceb_node *node)
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{
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return !!node->b[0];
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}
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/* indicates whether a root is empty or not */
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static inline int ceb_isempty(struct ceb_root * const*root)
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{
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return !*root;
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}
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/* returns a pointer to the key from the node and offset, where node is
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* assumed to be non-null.
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*/
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static inline void *_ceb_key_ptr(const struct ceb_node *node, ptrdiff_t kofs)
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{
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return (void*)((char *)node + kofs);
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}
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/* returns a pointer to the key from the node and offset if node is non-null,
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* otherwise null. I.e. this is made to safely return a pointer to the key
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* location from the return of a lookup operation.
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*/
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static inline void *ceb_key_ptr(const struct ceb_node *node, ptrdiff_t kofs)
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{
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return node ? _ceb_key_ptr(node, kofs) : NULL;
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}
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#endif /* _CEBTREE_H */
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