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/*
* Compact Elastic Binary Trees - exported functions operating on mb keys
*
* Copyright (C) 2014-2025 Willy Tarreau - w@1wt.eu
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/* NOTE: this file is only meant to be included from other C files. It will
* use the following private macros that must be defined by the caller:
* - CEB_KEY_TYPE: CEB_KT_IM, CEB_KT_MB
* - CEB_KEY_MEMBER: member of the struct ceb_node holding the key
* - CEB_MKEY_PFX: function name prefix for multi-key
* - CEB_UKEY_PFX: function name prefix for unique keys
*/
#include "cebtree-prv.h"
/*
* Below are the functions that support duplicate keys (_ceb_*)
*/
/*****************************************************************************\
* The declarations below always cause two functions to be declared, one *
* starting with "cebs_*" and one with "cebs_ofs_*" which takes a key offset *
* just after the root. The one without kofs just has this argument omitted *
* from its declaration and replaced with sizeof(struct ceb_node) in the *
* call to the underlying functions. *
\*****************************************************************************/
/* Inserts node <node> into tree <tree> based on its key that immediately
* follows the node and for <len> bytes. Returns the inserted node or the one
* that already contains the same key.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _insert, struct ceb_root **, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
int is_dup;
return _ceb_insert(root, node, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* return the first node or NULL if not found. */
CEB_FDECL3(struct ceb_node *, CEB_MKEY_PFX, _first, struct ceb_root *const *, root, ptrdiff_t, kofs, size_t, len)
{
int is_dup;
return _ceb_first(root, kofs, CEB_KEY_TYPE, len, &is_dup);
}
/* return the last node or NULL if not found. */
CEB_FDECL3(struct ceb_node *, CEB_MKEY_PFX, _last, struct ceb_root *const *, root, ptrdiff_t, kofs, size_t, len)
{
int is_dup;
return _ceb_last(root, kofs, CEB_KEY_TYPE, len, &is_dup);
}
/* look up the specified key <key> of length <len>, and returns either the node
* containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _lookup, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
int is_dup;
return _ceb_lookup(root, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* look up the specified key or the highest below it, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _lookup_le, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
int is_dup;
return _ceb_lookup_le(root, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* look up highest key below the specified one, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _lookup_lt, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
int is_dup;
return _ceb_lookup_lt(root, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* look up the specified key or the smallest above it, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _lookup_ge, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
int is_dup;
return _ceb_lookup_ge(root, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* look up the smallest key above the specified one, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _lookup_gt, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
int is_dup;
return _ceb_lookup_gt(root, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* search for the next node after the specified one, and return it, or NULL if
* not found. The approach consists in looking up that node, recalling the last
* time a left turn was made, and returning the first node along the right
* branch at that fork. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _next_unique, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
int is_dup;
return _ceb_next_unique(root, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* search for the prev node before the specified one, and return it, or NULL if
* not found. The approach consists in looking up that node, recalling the last
* time a right turn was made, and returning the last node along the left
* branch at that fork. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _prev_unique, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
int is_dup;
return _ceb_prev_unique(root, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* search for the next node after the specified one containing the same value,
* and return it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _next_dup, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
return _ceb_next_dup(root, kofs, CEB_KEY_TYPE, 0, len, key, node);
}
/* search for the prev node before the specified one containing the same value,
* and return it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _prev_dup, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
return _ceb_prev_dup(root, kofs, CEB_KEY_TYPE, 0, len, key, node);
}
/* search for the next node after the specified one, and return it, or NULL if
* not found. The approach consists in looking up that node, recalling the last
* time a left turn was made, and returning the first node along the right
* branch at that fork. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _next, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
int is_dup;
return _ceb_next(root, kofs, CEB_KEY_TYPE, 0, len, key, node, &is_dup);
}
/* search for the prev node before the specified one, and return it, or NULL if
* not found. The approach consists in looking up that node, recalling the last
* time a right turn was made, and returning the last node along the left
* branch at that fork. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _prev, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
int is_dup;
return _ceb_prev(root, kofs, CEB_KEY_TYPE, 0, len, key, node, &is_dup);
}
/* look up the specified node with its key and deletes it if found, and in any
* case, returns the node. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _delete, struct ceb_root **, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
int is_dup;
return _ceb_delete(root, node, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/* look up the specified key, and detaches it and returns it if found, or NULL
* if not found. The <len> field must correspond to the key length in bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_MKEY_PFX, _pick, struct ceb_root **, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
int is_dup;
return _ceb_delete(root, NULL, kofs, CEB_KEY_TYPE, 0, len, key, &is_dup);
}
/*
* Below are the functions that only support unique keys (_cebu_*)
*/
/*****************************************************************************\
* The declarations below always cause two functions to be declared, one *
* starting with "cebub_*" and one with "cebub_ofs_*" which takes a key *
* offset just after the root. The one without kofs just has this argument *
* omitted from its declaration and replaced with sizeof(struct ceb_node) in *
* the call to the underlying functions. *
\*****************************************************************************/
/* Inserts node <node> into unique tree <tree> based on its key that
* immediately follows the node and for <len> bytes. Returns the
* inserted node or the one that already contains the same key.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _insert, struct ceb_root **, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
return _ceb_insert(root, node, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* return the first node or NULL if not found. */
CEB_FDECL3(struct ceb_node *, CEB_UKEY_PFX, _first, struct ceb_root *const *, root, ptrdiff_t, kofs, size_t, len)
{
return _ceb_first(root, kofs, CEB_KEY_TYPE, len, NULL);
}
/* return the last node or NULL if not found. */
CEB_FDECL3(struct ceb_node *, CEB_UKEY_PFX, _last, struct ceb_root *const *, root, ptrdiff_t, kofs, size_t, len)
{
return _ceb_last(root, kofs, CEB_KEY_TYPE, len, NULL);
}
/* look up the specified key <key> of length <len>, and returns either the node
* containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _lookup, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
return _ceb_lookup(root, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* look up the specified key or the highest below it, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _lookup_le, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
return _ceb_lookup_le(root, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* look up highest key below the specified one, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _lookup_lt, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
return _ceb_lookup_lt(root, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* look up the specified key or the smallest above it, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _lookup_ge, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
return _ceb_lookup_ge(root, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* look up the smallest key above the specified one, and returns either the
* node containing it, or NULL if not found.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _lookup_gt, struct ceb_root *const *, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
return _ceb_lookup_gt(root, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* search for the next node after the specified one, and return it, or NULL if
* not found. The approach consists in looking up that node, recalling the last
* time a left turn was made, and returning the first node along the right
* branch at that fork. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _next, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
return _ceb_next_unique(root, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* search for the prev node before the specified one, and return it, or NULL if
* not found. The approach consists in looking up that node, recalling the last
* time a right turn was made, and returning the last node along the left
* branch at that fork. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _prev, struct ceb_root *const *, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
return _ceb_prev_unique(root, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* look up the specified node with its key and deletes it if found, and in any
* case, returns the node. The <len> field must correspond to the key length in
* bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _delete, struct ceb_root **, root, ptrdiff_t, kofs, struct ceb_node *, node, size_t, len)
{
const void *key = NODEK(node, kofs)->CEB_KEY_MEMBER;
return _ceb_delete(root, node, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}
/* look up the specified key, and detaches it and returns it if found, or NULL
* if not found. The <len> field must correspond to the key length in bytes.
*/
CEB_FDECL4(struct ceb_node *, CEB_UKEY_PFX, _pick, struct ceb_root **, root, ptrdiff_t, kofs, const void *, key, size_t, len)
{
return _ceb_delete(root, NULL, kofs, CEB_KEY_TYPE, 0, len, key, NULL);
}