1 83f0f95a 2022-09-29 op /* $OpenBSD: tree.h,v 1.30 2020/10/10 18:03:41 otto Exp $ */
3 83f0f95a 2022-09-29 op * Copyright 2002 Niels Provos <provos@citi.umich.edu>
4 83f0f95a 2022-09-29 op * All rights reserved.
6 83f0f95a 2022-09-29 op * Redistribution and use in source and binary forms, with or without
7 83f0f95a 2022-09-29 op * modification, are permitted provided that the following conditions
9 83f0f95a 2022-09-29 op * 1. Redistributions of source code must retain the above copyright
10 83f0f95a 2022-09-29 op * notice, this list of conditions and the following disclaimer.
11 83f0f95a 2022-09-29 op * 2. Redistributions in binary form must reproduce the above copyright
12 83f0f95a 2022-09-29 op * notice, this list of conditions and the following disclaimer in the
13 83f0f95a 2022-09-29 op * documentation and/or other materials provided with the distribution.
15 83f0f95a 2022-09-29 op * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 83f0f95a 2022-09-29 op * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 83f0f95a 2022-09-29 op * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 83f0f95a 2022-09-29 op * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 83f0f95a 2022-09-29 op * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 83f0f95a 2022-09-29 op * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 83f0f95a 2022-09-29 op * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 83f0f95a 2022-09-29 op * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 83f0f95a 2022-09-29 op * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 83f0f95a 2022-09-29 op * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 83f0f95a 2022-09-29 op #ifndef _SYS_TREE_H_
28 83f0f95a 2022-09-29 op #define _SYS_TREE_H_
30 83f0f95a 2022-09-29 op #include <stddef.h>
33 83f0f95a 2022-09-29 op * Local modifications:
34 83f0f95a 2022-09-29 op * - dropped __unused
35 83f0f95a 2022-09-29 op * - __inline -> inline
39 83f0f95a 2022-09-29 op * This file defines data structures for different types of trees:
40 83f0f95a 2022-09-29 op * splay trees and red-black trees.
42 83f0f95a 2022-09-29 op * A splay tree is a self-organizing data structure. Every operation
43 83f0f95a 2022-09-29 op * on the tree causes a splay to happen. The splay moves the requested
44 83f0f95a 2022-09-29 op * node to the root of the tree and partly rebalances it.
46 83f0f95a 2022-09-29 op * This has the benefit that request locality causes faster lookups as
47 83f0f95a 2022-09-29 op * the requested nodes move to the top of the tree. On the other hand,
48 83f0f95a 2022-09-29 op * every lookup causes memory writes.
50 83f0f95a 2022-09-29 op * The Balance Theorem bounds the total access time for m operations
51 83f0f95a 2022-09-29 op * and n inserts on an initially empty tree as O((m + n)lg n). The
52 83f0f95a 2022-09-29 op * amortized cost for a sequence of m accesses to a splay tree is O(lg n);
54 83f0f95a 2022-09-29 op * A red-black tree is a binary search tree with the node color as an
55 83f0f95a 2022-09-29 op * extra attribute. It fulfills a set of conditions:
56 83f0f95a 2022-09-29 op * - every search path from the root to a leaf consists of the
57 83f0f95a 2022-09-29 op * same number of black nodes,
58 83f0f95a 2022-09-29 op * - each red node (except for the root) has a black parent,
59 83f0f95a 2022-09-29 op * - each leaf node is black.
61 83f0f95a 2022-09-29 op * Every operation on a red-black tree is bounded as O(lg n).
62 83f0f95a 2022-09-29 op * The maximum height of a red-black tree is 2lg (n+1).
65 83f0f95a 2022-09-29 op #define SPLAY_HEAD(name, type) \
66 83f0f95a 2022-09-29 op struct name { \
67 83f0f95a 2022-09-29 op struct type *sph_root; /* root of the tree */ \
70 83f0f95a 2022-09-29 op #define SPLAY_INITIALIZER(root) \
73 83f0f95a 2022-09-29 op #define SPLAY_INIT(root) do { \
74 83f0f95a 2022-09-29 op (root)->sph_root = NULL; \
77 83f0f95a 2022-09-29 op #define SPLAY_ENTRY(type) \
79 83f0f95a 2022-09-29 op struct type *spe_left; /* left element */ \
80 83f0f95a 2022-09-29 op struct type *spe_right; /* right element */ \
83 83f0f95a 2022-09-29 op #define SPLAY_LEFT(elm, field) (elm)->field.spe_left
84 83f0f95a 2022-09-29 op #define SPLAY_RIGHT(elm, field) (elm)->field.spe_right
85 83f0f95a 2022-09-29 op #define SPLAY_ROOT(head) (head)->sph_root
86 83f0f95a 2022-09-29 op #define SPLAY_EMPTY(head) (SPLAY_ROOT(head) == NULL)
88 83f0f95a 2022-09-29 op /* SPLAY_ROTATE_{LEFT,RIGHT} expect that tmp hold SPLAY_{RIGHT,LEFT} */
89 83f0f95a 2022-09-29 op #define SPLAY_ROTATE_RIGHT(head, tmp, field) do { \
90 83f0f95a 2022-09-29 op SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(tmp, field); \
91 83f0f95a 2022-09-29 op SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
92 83f0f95a 2022-09-29 op (head)->sph_root = tmp; \
95 83f0f95a 2022-09-29 op #define SPLAY_ROTATE_LEFT(head, tmp, field) do { \
96 83f0f95a 2022-09-29 op SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(tmp, field); \
97 83f0f95a 2022-09-29 op SPLAY_LEFT(tmp, field) = (head)->sph_root; \
98 83f0f95a 2022-09-29 op (head)->sph_root = tmp; \
101 83f0f95a 2022-09-29 op #define SPLAY_LINKLEFT(head, tmp, field) do { \
102 83f0f95a 2022-09-29 op SPLAY_LEFT(tmp, field) = (head)->sph_root; \
103 83f0f95a 2022-09-29 op tmp = (head)->sph_root; \
104 83f0f95a 2022-09-29 op (head)->sph_root = SPLAY_LEFT((head)->sph_root, field); \
107 83f0f95a 2022-09-29 op #define SPLAY_LINKRIGHT(head, tmp, field) do { \
108 83f0f95a 2022-09-29 op SPLAY_RIGHT(tmp, field) = (head)->sph_root; \
109 83f0f95a 2022-09-29 op tmp = (head)->sph_root; \
110 83f0f95a 2022-09-29 op (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field); \
113 83f0f95a 2022-09-29 op #define SPLAY_ASSEMBLE(head, node, left, right, field) do { \
114 83f0f95a 2022-09-29 op SPLAY_RIGHT(left, field) = SPLAY_LEFT((head)->sph_root, field); \
115 83f0f95a 2022-09-29 op SPLAY_LEFT(right, field) = SPLAY_RIGHT((head)->sph_root, field);\
116 83f0f95a 2022-09-29 op SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(node, field); \
117 83f0f95a 2022-09-29 op SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(node, field); \
120 83f0f95a 2022-09-29 op /* Generates prototypes and inline functions */
122 83f0f95a 2022-09-29 op #define SPLAY_PROTOTYPE(name, type, field, cmp) \
123 83f0f95a 2022-09-29 op void name##_SPLAY(struct name *, struct type *); \
124 83f0f95a 2022-09-29 op void name##_SPLAY_MINMAX(struct name *, int); \
125 83f0f95a 2022-09-29 op struct type *name##_SPLAY_INSERT(struct name *, struct type *); \
126 83f0f95a 2022-09-29 op struct type *name##_SPLAY_REMOVE(struct name *, struct type *); \
128 83f0f95a 2022-09-29 op /* Finds the node with the same key as elm */ \
129 83f0f95a 2022-09-29 op static inline struct type * \
130 83f0f95a 2022-09-29 op name##_SPLAY_FIND(struct name *head, struct type *elm) \
132 83f0f95a 2022-09-29 op if (SPLAY_EMPTY(head)) \
133 83f0f95a 2022-09-29 op return(NULL); \
134 83f0f95a 2022-09-29 op name##_SPLAY(head, elm); \
135 83f0f95a 2022-09-29 op if ((cmp)(elm, (head)->sph_root) == 0) \
136 83f0f95a 2022-09-29 op return (head->sph_root); \
137 83f0f95a 2022-09-29 op return (NULL); \
140 83f0f95a 2022-09-29 op static inline struct type * \
141 83f0f95a 2022-09-29 op name##_SPLAY_NEXT(struct name *head, struct type *elm) \
143 83f0f95a 2022-09-29 op name##_SPLAY(head, elm); \
144 83f0f95a 2022-09-29 op if (SPLAY_RIGHT(elm, field) != NULL) { \
145 83f0f95a 2022-09-29 op elm = SPLAY_RIGHT(elm, field); \
146 83f0f95a 2022-09-29 op while (SPLAY_LEFT(elm, field) != NULL) { \
147 83f0f95a 2022-09-29 op elm = SPLAY_LEFT(elm, field); \
150 83f0f95a 2022-09-29 op elm = NULL; \
151 83f0f95a 2022-09-29 op return (elm); \
154 83f0f95a 2022-09-29 op static inline struct type * \
155 83f0f95a 2022-09-29 op name##_SPLAY_MIN_MAX(struct name *head, int val) \
157 83f0f95a 2022-09-29 op name##_SPLAY_MINMAX(head, val); \
158 83f0f95a 2022-09-29 op return (SPLAY_ROOT(head)); \
161 83f0f95a 2022-09-29 op /* Main splay operation.
162 83f0f95a 2022-09-29 op * Moves node close to the key of elm to top
164 83f0f95a 2022-09-29 op #define SPLAY_GENERATE(name, type, field, cmp) \
165 83f0f95a 2022-09-29 op struct type * \
166 83f0f95a 2022-09-29 op name##_SPLAY_INSERT(struct name *head, struct type *elm) \
168 83f0f95a 2022-09-29 op if (SPLAY_EMPTY(head)) { \
169 83f0f95a 2022-09-29 op SPLAY_LEFT(elm, field) = SPLAY_RIGHT(elm, field) = NULL; \
171 83f0f95a 2022-09-29 op int __comp; \
172 83f0f95a 2022-09-29 op name##_SPLAY(head, elm); \
173 83f0f95a 2022-09-29 op __comp = (cmp)(elm, (head)->sph_root); \
174 83f0f95a 2022-09-29 op if(__comp < 0) { \
175 83f0f95a 2022-09-29 op SPLAY_LEFT(elm, field) = SPLAY_LEFT((head)->sph_root, field);\
176 83f0f95a 2022-09-29 op SPLAY_RIGHT(elm, field) = (head)->sph_root; \
177 83f0f95a 2022-09-29 op SPLAY_LEFT((head)->sph_root, field) = NULL; \
178 83f0f95a 2022-09-29 op } else if (__comp > 0) { \
179 83f0f95a 2022-09-29 op SPLAY_RIGHT(elm, field) = SPLAY_RIGHT((head)->sph_root, field);\
180 83f0f95a 2022-09-29 op SPLAY_LEFT(elm, field) = (head)->sph_root; \
181 83f0f95a 2022-09-29 op SPLAY_RIGHT((head)->sph_root, field) = NULL; \
183 83f0f95a 2022-09-29 op return ((head)->sph_root); \
185 83f0f95a 2022-09-29 op (head)->sph_root = (elm); \
186 83f0f95a 2022-09-29 op return (NULL); \
189 83f0f95a 2022-09-29 op struct type * \
190 83f0f95a 2022-09-29 op name##_SPLAY_REMOVE(struct name *head, struct type *elm) \
192 83f0f95a 2022-09-29 op struct type *__tmp; \
193 83f0f95a 2022-09-29 op if (SPLAY_EMPTY(head)) \
194 83f0f95a 2022-09-29 op return (NULL); \
195 83f0f95a 2022-09-29 op name##_SPLAY(head, elm); \
196 83f0f95a 2022-09-29 op if ((cmp)(elm, (head)->sph_root) == 0) { \
197 83f0f95a 2022-09-29 op if (SPLAY_LEFT((head)->sph_root, field) == NULL) { \
198 83f0f95a 2022-09-29 op (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field);\
200 83f0f95a 2022-09-29 op __tmp = SPLAY_RIGHT((head)->sph_root, field); \
201 83f0f95a 2022-09-29 op (head)->sph_root = SPLAY_LEFT((head)->sph_root, field);\
202 83f0f95a 2022-09-29 op name##_SPLAY(head, elm); \
203 83f0f95a 2022-09-29 op SPLAY_RIGHT((head)->sph_root, field) = __tmp; \
205 83f0f95a 2022-09-29 op return (elm); \
207 83f0f95a 2022-09-29 op return (NULL); \
211 83f0f95a 2022-09-29 op name##_SPLAY(struct name *head, struct type *elm) \
213 83f0f95a 2022-09-29 op struct type __node, *__left, *__right, *__tmp; \
214 83f0f95a 2022-09-29 op int __comp; \
216 83f0f95a 2022-09-29 op SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\
217 83f0f95a 2022-09-29 op __left = __right = &__node; \
219 83f0f95a 2022-09-29 op while ((__comp = (cmp)(elm, (head)->sph_root))) { \
220 83f0f95a 2022-09-29 op if (__comp < 0) { \
221 83f0f95a 2022-09-29 op __tmp = SPLAY_LEFT((head)->sph_root, field); \
222 83f0f95a 2022-09-29 op if (__tmp == NULL) \
224 83f0f95a 2022-09-29 op if ((cmp)(elm, __tmp) < 0){ \
225 83f0f95a 2022-09-29 op SPLAY_ROTATE_RIGHT(head, __tmp, field); \
226 83f0f95a 2022-09-29 op if (SPLAY_LEFT((head)->sph_root, field) == NULL)\
229 83f0f95a 2022-09-29 op SPLAY_LINKLEFT(head, __right, field); \
230 83f0f95a 2022-09-29 op } else if (__comp > 0) { \
231 83f0f95a 2022-09-29 op __tmp = SPLAY_RIGHT((head)->sph_root, field); \
232 83f0f95a 2022-09-29 op if (__tmp == NULL) \
234 83f0f95a 2022-09-29 op if ((cmp)(elm, __tmp) > 0){ \
235 83f0f95a 2022-09-29 op SPLAY_ROTATE_LEFT(head, __tmp, field); \
236 83f0f95a 2022-09-29 op if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\
239 83f0f95a 2022-09-29 op SPLAY_LINKRIGHT(head, __left, field); \
242 83f0f95a 2022-09-29 op SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
245 83f0f95a 2022-09-29 op /* Splay with either the minimum or the maximum element \
246 83f0f95a 2022-09-29 op * Used to find minimum or maximum element in tree. \
248 83f0f95a 2022-09-29 op void name##_SPLAY_MINMAX(struct name *head, int __comp) \
250 83f0f95a 2022-09-29 op struct type __node, *__left, *__right, *__tmp; \
252 83f0f95a 2022-09-29 op SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\
253 83f0f95a 2022-09-29 op __left = __right = &__node; \
255 83f0f95a 2022-09-29 op while (1) { \
256 83f0f95a 2022-09-29 op if (__comp < 0) { \
257 83f0f95a 2022-09-29 op __tmp = SPLAY_LEFT((head)->sph_root, field); \
258 83f0f95a 2022-09-29 op if (__tmp == NULL) \
260 83f0f95a 2022-09-29 op if (__comp < 0){ \
261 83f0f95a 2022-09-29 op SPLAY_ROTATE_RIGHT(head, __tmp, field); \
262 83f0f95a 2022-09-29 op if (SPLAY_LEFT((head)->sph_root, field) == NULL)\
265 83f0f95a 2022-09-29 op SPLAY_LINKLEFT(head, __right, field); \
266 83f0f95a 2022-09-29 op } else if (__comp > 0) { \
267 83f0f95a 2022-09-29 op __tmp = SPLAY_RIGHT((head)->sph_root, field); \
268 83f0f95a 2022-09-29 op if (__tmp == NULL) \
270 83f0f95a 2022-09-29 op if (__comp > 0) { \
271 83f0f95a 2022-09-29 op SPLAY_ROTATE_LEFT(head, __tmp, field); \
272 83f0f95a 2022-09-29 op if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\
275 83f0f95a 2022-09-29 op SPLAY_LINKRIGHT(head, __left, field); \
278 83f0f95a 2022-09-29 op SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \
281 83f0f95a 2022-09-29 op #define SPLAY_NEGINF -1
282 83f0f95a 2022-09-29 op #define SPLAY_INF 1
284 83f0f95a 2022-09-29 op #define SPLAY_INSERT(name, x, y) name##_SPLAY_INSERT(x, y)
285 83f0f95a 2022-09-29 op #define SPLAY_REMOVE(name, x, y) name##_SPLAY_REMOVE(x, y)
286 83f0f95a 2022-09-29 op #define SPLAY_FIND(name, x, y) name##_SPLAY_FIND(x, y)
287 83f0f95a 2022-09-29 op #define SPLAY_NEXT(name, x, y) name##_SPLAY_NEXT(x, y)
288 83f0f95a 2022-09-29 op #define SPLAY_MIN(name, x) (SPLAY_EMPTY(x) ? NULL \
289 83f0f95a 2022-09-29 op : name##_SPLAY_MIN_MAX(x, SPLAY_NEGINF))
290 83f0f95a 2022-09-29 op #define SPLAY_MAX(name, x) (SPLAY_EMPTY(x) ? NULL \
291 83f0f95a 2022-09-29 op : name##_SPLAY_MIN_MAX(x, SPLAY_INF))
293 83f0f95a 2022-09-29 op #define SPLAY_FOREACH(x, name, head) \
294 83f0f95a 2022-09-29 op for ((x) = SPLAY_MIN(name, head); \
295 83f0f95a 2022-09-29 op (x) != NULL; \
296 83f0f95a 2022-09-29 op (x) = SPLAY_NEXT(name, head, x))
298 83f0f95a 2022-09-29 op /* Macros that define a red-black tree */
299 83f0f95a 2022-09-29 op #define RB_HEAD(name, type) \
300 83f0f95a 2022-09-29 op struct name { \
301 83f0f95a 2022-09-29 op struct type *rbh_root; /* root of the tree */ \
304 83f0f95a 2022-09-29 op #define RB_INITIALIZER(root) \
307 83f0f95a 2022-09-29 op #define RB_INIT(root) do { \
308 83f0f95a 2022-09-29 op (root)->rbh_root = NULL; \
311 83f0f95a 2022-09-29 op #define RB_BLACK 0
312 83f0f95a 2022-09-29 op #define RB_RED 1
313 83f0f95a 2022-09-29 op #define RB_ENTRY(type) \
315 83f0f95a 2022-09-29 op struct type *rbe_left; /* left element */ \
316 83f0f95a 2022-09-29 op struct type *rbe_right; /* right element */ \
317 83f0f95a 2022-09-29 op struct type *rbe_parent; /* parent element */ \
318 83f0f95a 2022-09-29 op int rbe_color; /* node color */ \
321 83f0f95a 2022-09-29 op #define RB_LEFT(elm, field) (elm)->field.rbe_left
322 83f0f95a 2022-09-29 op #define RB_RIGHT(elm, field) (elm)->field.rbe_right
323 83f0f95a 2022-09-29 op #define RB_PARENT(elm, field) (elm)->field.rbe_parent
324 83f0f95a 2022-09-29 op #define RB_COLOR(elm, field) (elm)->field.rbe_color
325 83f0f95a 2022-09-29 op #define RB_ROOT(head) (head)->rbh_root
326 83f0f95a 2022-09-29 op #define RB_EMPTY(head) (RB_ROOT(head) == NULL)
328 83f0f95a 2022-09-29 op #define RB_SET(elm, parent, field) do { \
329 83f0f95a 2022-09-29 op RB_PARENT(elm, field) = parent; \
330 83f0f95a 2022-09-29 op RB_LEFT(elm, field) = RB_RIGHT(elm, field) = NULL; \
331 83f0f95a 2022-09-29 op RB_COLOR(elm, field) = RB_RED; \
334 83f0f95a 2022-09-29 op #define RB_SET_BLACKRED(black, red, field) do { \
335 83f0f95a 2022-09-29 op RB_COLOR(black, field) = RB_BLACK; \
336 83f0f95a 2022-09-29 op RB_COLOR(red, field) = RB_RED; \
339 83f0f95a 2022-09-29 op #ifndef RB_AUGMENT
340 83f0f95a 2022-09-29 op #define RB_AUGMENT(x) do {} while (0)
343 83f0f95a 2022-09-29 op #define RB_ROTATE_LEFT(head, elm, tmp, field) do { \
344 83f0f95a 2022-09-29 op (tmp) = RB_RIGHT(elm, field); \
345 83f0f95a 2022-09-29 op if ((RB_RIGHT(elm, field) = RB_LEFT(tmp, field))) { \
346 83f0f95a 2022-09-29 op RB_PARENT(RB_LEFT(tmp, field), field) = (elm); \
348 83f0f95a 2022-09-29 op RB_AUGMENT(elm); \
349 83f0f95a 2022-09-29 op if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) { \
350 83f0f95a 2022-09-29 op if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \
351 83f0f95a 2022-09-29 op RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \
353 83f0f95a 2022-09-29 op RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \
355 83f0f95a 2022-09-29 op (head)->rbh_root = (tmp); \
356 83f0f95a 2022-09-29 op RB_LEFT(tmp, field) = (elm); \
357 83f0f95a 2022-09-29 op RB_PARENT(elm, field) = (tmp); \
358 83f0f95a 2022-09-29 op RB_AUGMENT(tmp); \
359 83f0f95a 2022-09-29 op if ((RB_PARENT(tmp, field))) \
360 83f0f95a 2022-09-29 op RB_AUGMENT(RB_PARENT(tmp, field)); \
363 83f0f95a 2022-09-29 op #define RB_ROTATE_RIGHT(head, elm, tmp, field) do { \
364 83f0f95a 2022-09-29 op (tmp) = RB_LEFT(elm, field); \
365 83f0f95a 2022-09-29 op if ((RB_LEFT(elm, field) = RB_RIGHT(tmp, field))) { \
366 83f0f95a 2022-09-29 op RB_PARENT(RB_RIGHT(tmp, field), field) = (elm); \
368 83f0f95a 2022-09-29 op RB_AUGMENT(elm); \
369 83f0f95a 2022-09-29 op if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) { \
370 83f0f95a 2022-09-29 op if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \
371 83f0f95a 2022-09-29 op RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \
373 83f0f95a 2022-09-29 op RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \
375 83f0f95a 2022-09-29 op (head)->rbh_root = (tmp); \
376 83f0f95a 2022-09-29 op RB_RIGHT(tmp, field) = (elm); \
377 83f0f95a 2022-09-29 op RB_PARENT(elm, field) = (tmp); \
378 83f0f95a 2022-09-29 op RB_AUGMENT(tmp); \
379 83f0f95a 2022-09-29 op if ((RB_PARENT(tmp, field))) \
380 83f0f95a 2022-09-29 op RB_AUGMENT(RB_PARENT(tmp, field)); \
383 83f0f95a 2022-09-29 op /* Generates prototypes and inline functions */
384 83f0f95a 2022-09-29 op #define RB_PROTOTYPE(name, type, field, cmp) \
385 83f0f95a 2022-09-29 op RB_PROTOTYPE_INTERNAL(name, type, field, cmp,)
386 83f0f95a 2022-09-29 op #define RB_PROTOTYPE_STATIC(name, type, field, cmp) \
387 83f0f95a 2022-09-29 op RB_PROTOTYPE_INTERNAL(name, type, field, cmp, __attribute__((__unused__)) static)
388 83f0f95a 2022-09-29 op #define RB_PROTOTYPE_INTERNAL(name, type, field, cmp, attr) \
389 83f0f95a 2022-09-29 op attr void name##_RB_INSERT_COLOR(struct name *, struct type *); \
390 83f0f95a 2022-09-29 op attr void name##_RB_REMOVE_COLOR(struct name *, struct type *, struct type *);\
391 83f0f95a 2022-09-29 op attr struct type *name##_RB_REMOVE(struct name *, struct type *); \
392 83f0f95a 2022-09-29 op attr struct type *name##_RB_INSERT(struct name *, struct type *); \
393 83f0f95a 2022-09-29 op attr struct type *name##_RB_FIND(struct name *, struct type *); \
394 83f0f95a 2022-09-29 op attr struct type *name##_RB_NFIND(struct name *, struct type *); \
395 83f0f95a 2022-09-29 op attr struct type *name##_RB_NEXT(struct type *); \
396 83f0f95a 2022-09-29 op attr struct type *name##_RB_PREV(struct type *); \
397 83f0f95a 2022-09-29 op attr struct type *name##_RB_MINMAX(struct name *, int); \
400 83f0f95a 2022-09-29 op /* Main rb operation.
401 83f0f95a 2022-09-29 op * Moves node close to the key of elm to top
403 83f0f95a 2022-09-29 op #define RB_GENERATE(name, type, field, cmp) \
404 83f0f95a 2022-09-29 op RB_GENERATE_INTERNAL(name, type, field, cmp,)
405 83f0f95a 2022-09-29 op #define RB_GENERATE_STATIC(name, type, field, cmp) \
406 83f0f95a 2022-09-29 op RB_GENERATE_INTERNAL(name, type, field, cmp, __attribute__((__unused__)) static)
407 83f0f95a 2022-09-29 op #define RB_GENERATE_INTERNAL(name, type, field, cmp, attr) \
409 83f0f95a 2022-09-29 op name##_RB_INSERT_COLOR(struct name *head, struct type *elm) \
411 83f0f95a 2022-09-29 op struct type *parent, *gparent, *tmp; \
412 83f0f95a 2022-09-29 op while ((parent = RB_PARENT(elm, field)) && \
413 83f0f95a 2022-09-29 op RB_COLOR(parent, field) == RB_RED) { \
414 83f0f95a 2022-09-29 op gparent = RB_PARENT(parent, field); \
415 83f0f95a 2022-09-29 op if (parent == RB_LEFT(gparent, field)) { \
416 83f0f95a 2022-09-29 op tmp = RB_RIGHT(gparent, field); \
417 83f0f95a 2022-09-29 op if (tmp && RB_COLOR(tmp, field) == RB_RED) { \
418 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_BLACK; \
419 83f0f95a 2022-09-29 op RB_SET_BLACKRED(parent, gparent, field);\
420 83f0f95a 2022-09-29 op elm = gparent; \
423 83f0f95a 2022-09-29 op if (RB_RIGHT(parent, field) == elm) { \
424 83f0f95a 2022-09-29 op RB_ROTATE_LEFT(head, parent, tmp, field);\
425 83f0f95a 2022-09-29 op tmp = parent; \
426 83f0f95a 2022-09-29 op parent = elm; \
429 83f0f95a 2022-09-29 op RB_SET_BLACKRED(parent, gparent, field); \
430 83f0f95a 2022-09-29 op RB_ROTATE_RIGHT(head, gparent, tmp, field); \
432 83f0f95a 2022-09-29 op tmp = RB_LEFT(gparent, field); \
433 83f0f95a 2022-09-29 op if (tmp && RB_COLOR(tmp, field) == RB_RED) { \
434 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_BLACK; \
435 83f0f95a 2022-09-29 op RB_SET_BLACKRED(parent, gparent, field);\
436 83f0f95a 2022-09-29 op elm = gparent; \
439 83f0f95a 2022-09-29 op if (RB_LEFT(parent, field) == elm) { \
440 83f0f95a 2022-09-29 op RB_ROTATE_RIGHT(head, parent, tmp, field);\
441 83f0f95a 2022-09-29 op tmp = parent; \
442 83f0f95a 2022-09-29 op parent = elm; \
445 83f0f95a 2022-09-29 op RB_SET_BLACKRED(parent, gparent, field); \
446 83f0f95a 2022-09-29 op RB_ROTATE_LEFT(head, gparent, tmp, field); \
449 83f0f95a 2022-09-29 op RB_COLOR(head->rbh_root, field) = RB_BLACK; \
453 83f0f95a 2022-09-29 op name##_RB_REMOVE_COLOR(struct name *head, struct type *parent, struct type *elm) \
455 83f0f95a 2022-09-29 op struct type *tmp; \
456 83f0f95a 2022-09-29 op while ((elm == NULL || RB_COLOR(elm, field) == RB_BLACK) && \
457 83f0f95a 2022-09-29 op elm != RB_ROOT(head)) { \
458 83f0f95a 2022-09-29 op if (RB_LEFT(parent, field) == elm) { \
459 83f0f95a 2022-09-29 op tmp = RB_RIGHT(parent, field); \
460 83f0f95a 2022-09-29 op if (RB_COLOR(tmp, field) == RB_RED) { \
461 83f0f95a 2022-09-29 op RB_SET_BLACKRED(tmp, parent, field); \
462 83f0f95a 2022-09-29 op RB_ROTATE_LEFT(head, parent, tmp, field);\
463 83f0f95a 2022-09-29 op tmp = RB_RIGHT(parent, field); \
465 83f0f95a 2022-09-29 op if ((RB_LEFT(tmp, field) == NULL || \
466 83f0f95a 2022-09-29 op RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\
467 83f0f95a 2022-09-29 op (RB_RIGHT(tmp, field) == NULL || \
468 83f0f95a 2022-09-29 op RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\
469 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_RED; \
470 83f0f95a 2022-09-29 op elm = parent; \
471 83f0f95a 2022-09-29 op parent = RB_PARENT(elm, field); \
473 83f0f95a 2022-09-29 op if (RB_RIGHT(tmp, field) == NULL || \
474 83f0f95a 2022-09-29 op RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK) {\
475 83f0f95a 2022-09-29 op struct type *oleft; \
476 83f0f95a 2022-09-29 op if ((oleft = RB_LEFT(tmp, field)))\
477 83f0f95a 2022-09-29 op RB_COLOR(oleft, field) = RB_BLACK;\
478 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_RED; \
479 83f0f95a 2022-09-29 op RB_ROTATE_RIGHT(head, tmp, oleft, field);\
480 83f0f95a 2022-09-29 op tmp = RB_RIGHT(parent, field); \
482 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_COLOR(parent, field);\
483 83f0f95a 2022-09-29 op RB_COLOR(parent, field) = RB_BLACK; \
484 83f0f95a 2022-09-29 op if (RB_RIGHT(tmp, field)) \
485 83f0f95a 2022-09-29 op RB_COLOR(RB_RIGHT(tmp, field), field) = RB_BLACK;\
486 83f0f95a 2022-09-29 op RB_ROTATE_LEFT(head, parent, tmp, field);\
487 83f0f95a 2022-09-29 op elm = RB_ROOT(head); \
491 83f0f95a 2022-09-29 op tmp = RB_LEFT(parent, field); \
492 83f0f95a 2022-09-29 op if (RB_COLOR(tmp, field) == RB_RED) { \
493 83f0f95a 2022-09-29 op RB_SET_BLACKRED(tmp, parent, field); \
494 83f0f95a 2022-09-29 op RB_ROTATE_RIGHT(head, parent, tmp, field);\
495 83f0f95a 2022-09-29 op tmp = RB_LEFT(parent, field); \
497 83f0f95a 2022-09-29 op if ((RB_LEFT(tmp, field) == NULL || \
498 83f0f95a 2022-09-29 op RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\
499 83f0f95a 2022-09-29 op (RB_RIGHT(tmp, field) == NULL || \
500 83f0f95a 2022-09-29 op RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\
501 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_RED; \
502 83f0f95a 2022-09-29 op elm = parent; \
503 83f0f95a 2022-09-29 op parent = RB_PARENT(elm, field); \
505 83f0f95a 2022-09-29 op if (RB_LEFT(tmp, field) == NULL || \
506 83f0f95a 2022-09-29 op RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) {\
507 83f0f95a 2022-09-29 op struct type *oright; \
508 83f0f95a 2022-09-29 op if ((oright = RB_RIGHT(tmp, field)))\
509 83f0f95a 2022-09-29 op RB_COLOR(oright, field) = RB_BLACK;\
510 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_RED; \
511 83f0f95a 2022-09-29 op RB_ROTATE_LEFT(head, tmp, oright, field);\
512 83f0f95a 2022-09-29 op tmp = RB_LEFT(parent, field); \
514 83f0f95a 2022-09-29 op RB_COLOR(tmp, field) = RB_COLOR(parent, field);\
515 83f0f95a 2022-09-29 op RB_COLOR(parent, field) = RB_BLACK; \
516 83f0f95a 2022-09-29 op if (RB_LEFT(tmp, field)) \
517 83f0f95a 2022-09-29 op RB_COLOR(RB_LEFT(tmp, field), field) = RB_BLACK;\
518 83f0f95a 2022-09-29 op RB_ROTATE_RIGHT(head, parent, tmp, field);\
519 83f0f95a 2022-09-29 op elm = RB_ROOT(head); \
525 83f0f95a 2022-09-29 op RB_COLOR(elm, field) = RB_BLACK; \
528 83f0f95a 2022-09-29 op attr struct type * \
529 83f0f95a 2022-09-29 op name##_RB_REMOVE(struct name *head, struct type *elm) \
531 83f0f95a 2022-09-29 op struct type *child, *parent, *old = elm; \
533 83f0f95a 2022-09-29 op if (RB_LEFT(elm, field) == NULL) \
534 83f0f95a 2022-09-29 op child = RB_RIGHT(elm, field); \
535 83f0f95a 2022-09-29 op else if (RB_RIGHT(elm, field) == NULL) \
536 83f0f95a 2022-09-29 op child = RB_LEFT(elm, field); \
538 83f0f95a 2022-09-29 op struct type *left; \
539 83f0f95a 2022-09-29 op elm = RB_RIGHT(elm, field); \
540 83f0f95a 2022-09-29 op while ((left = RB_LEFT(elm, field))) \
541 83f0f95a 2022-09-29 op elm = left; \
542 83f0f95a 2022-09-29 op child = RB_RIGHT(elm, field); \
543 83f0f95a 2022-09-29 op parent = RB_PARENT(elm, field); \
544 83f0f95a 2022-09-29 op color = RB_COLOR(elm, field); \
546 83f0f95a 2022-09-29 op RB_PARENT(child, field) = parent; \
547 83f0f95a 2022-09-29 op if (parent) { \
548 83f0f95a 2022-09-29 op if (RB_LEFT(parent, field) == elm) \
549 83f0f95a 2022-09-29 op RB_LEFT(parent, field) = child; \
551 83f0f95a 2022-09-29 op RB_RIGHT(parent, field) = child; \
552 83f0f95a 2022-09-29 op RB_AUGMENT(parent); \
554 83f0f95a 2022-09-29 op RB_ROOT(head) = child; \
555 83f0f95a 2022-09-29 op if (RB_PARENT(elm, field) == old) \
556 83f0f95a 2022-09-29 op parent = elm; \
557 83f0f95a 2022-09-29 op (elm)->field = (old)->field; \
558 83f0f95a 2022-09-29 op if (RB_PARENT(old, field)) { \
559 83f0f95a 2022-09-29 op if (RB_LEFT(RB_PARENT(old, field), field) == old)\
560 83f0f95a 2022-09-29 op RB_LEFT(RB_PARENT(old, field), field) = elm;\
562 83f0f95a 2022-09-29 op RB_RIGHT(RB_PARENT(old, field), field) = elm;\
563 83f0f95a 2022-09-29 op RB_AUGMENT(RB_PARENT(old, field)); \
565 83f0f95a 2022-09-29 op RB_ROOT(head) = elm; \
566 83f0f95a 2022-09-29 op RB_PARENT(RB_LEFT(old, field), field) = elm; \
567 83f0f95a 2022-09-29 op if (RB_RIGHT(old, field)) \
568 83f0f95a 2022-09-29 op RB_PARENT(RB_RIGHT(old, field), field) = elm; \
569 83f0f95a 2022-09-29 op if (parent) { \
570 83f0f95a 2022-09-29 op left = parent; \
572 83f0f95a 2022-09-29 op RB_AUGMENT(left); \
573 83f0f95a 2022-09-29 op } while ((left = RB_PARENT(left, field))); \
575 83f0f95a 2022-09-29 op goto color; \
577 83f0f95a 2022-09-29 op parent = RB_PARENT(elm, field); \
578 83f0f95a 2022-09-29 op color = RB_COLOR(elm, field); \
580 83f0f95a 2022-09-29 op RB_PARENT(child, field) = parent; \
581 83f0f95a 2022-09-29 op if (parent) { \
582 83f0f95a 2022-09-29 op if (RB_LEFT(parent, field) == elm) \
583 83f0f95a 2022-09-29 op RB_LEFT(parent, field) = child; \
585 83f0f95a 2022-09-29 op RB_RIGHT(parent, field) = child; \
586 83f0f95a 2022-09-29 op RB_AUGMENT(parent); \
588 83f0f95a 2022-09-29 op RB_ROOT(head) = child; \
590 83f0f95a 2022-09-29 op if (color == RB_BLACK) \
591 83f0f95a 2022-09-29 op name##_RB_REMOVE_COLOR(head, parent, child); \
592 83f0f95a 2022-09-29 op return (old); \
595 83f0f95a 2022-09-29 op /* Inserts a node into the RB tree */ \
596 83f0f95a 2022-09-29 op attr struct type * \
597 83f0f95a 2022-09-29 op name##_RB_INSERT(struct name *head, struct type *elm) \
599 83f0f95a 2022-09-29 op struct type *tmp; \
600 83f0f95a 2022-09-29 op struct type *parent = NULL; \
601 83f0f95a 2022-09-29 op int comp = 0; \
602 83f0f95a 2022-09-29 op tmp = RB_ROOT(head); \
603 83f0f95a 2022-09-29 op while (tmp) { \
604 83f0f95a 2022-09-29 op parent = tmp; \
605 83f0f95a 2022-09-29 op comp = (cmp)(elm, parent); \
606 83f0f95a 2022-09-29 op if (comp < 0) \
607 83f0f95a 2022-09-29 op tmp = RB_LEFT(tmp, field); \
608 83f0f95a 2022-09-29 op else if (comp > 0) \
609 83f0f95a 2022-09-29 op tmp = RB_RIGHT(tmp, field); \
611 83f0f95a 2022-09-29 op return (tmp); \
613 83f0f95a 2022-09-29 op RB_SET(elm, parent, field); \
614 83f0f95a 2022-09-29 op if (parent != NULL) { \
615 83f0f95a 2022-09-29 op if (comp < 0) \
616 83f0f95a 2022-09-29 op RB_LEFT(parent, field) = elm; \
618 83f0f95a 2022-09-29 op RB_RIGHT(parent, field) = elm; \
619 83f0f95a 2022-09-29 op RB_AUGMENT(parent); \
621 83f0f95a 2022-09-29 op RB_ROOT(head) = elm; \
622 83f0f95a 2022-09-29 op name##_RB_INSERT_COLOR(head, elm); \
623 83f0f95a 2022-09-29 op return (NULL); \
626 83f0f95a 2022-09-29 op /* Finds the node with the same key as elm */ \
627 83f0f95a 2022-09-29 op attr struct type * \
628 83f0f95a 2022-09-29 op name##_RB_FIND(struct name *head, struct type *elm) \
630 83f0f95a 2022-09-29 op struct type *tmp = RB_ROOT(head); \
632 83f0f95a 2022-09-29 op while (tmp) { \
633 83f0f95a 2022-09-29 op comp = cmp(elm, tmp); \
634 83f0f95a 2022-09-29 op if (comp < 0) \
635 83f0f95a 2022-09-29 op tmp = RB_LEFT(tmp, field); \
636 83f0f95a 2022-09-29 op else if (comp > 0) \
637 83f0f95a 2022-09-29 op tmp = RB_RIGHT(tmp, field); \
639 83f0f95a 2022-09-29 op return (tmp); \
641 83f0f95a 2022-09-29 op return (NULL); \
644 83f0f95a 2022-09-29 op /* Finds the first node greater than or equal to the search key */ \
645 83f0f95a 2022-09-29 op attr struct type * \
646 83f0f95a 2022-09-29 op name##_RB_NFIND(struct name *head, struct type *elm) \
648 83f0f95a 2022-09-29 op struct type *tmp = RB_ROOT(head); \
649 83f0f95a 2022-09-29 op struct type *res = NULL; \
651 83f0f95a 2022-09-29 op while (tmp) { \
652 83f0f95a 2022-09-29 op comp = cmp(elm, tmp); \
653 83f0f95a 2022-09-29 op if (comp < 0) { \
655 83f0f95a 2022-09-29 op tmp = RB_LEFT(tmp, field); \
657 83f0f95a 2022-09-29 op else if (comp > 0) \
658 83f0f95a 2022-09-29 op tmp = RB_RIGHT(tmp, field); \
660 83f0f95a 2022-09-29 op return (tmp); \
662 83f0f95a 2022-09-29 op return (res); \
665 83f0f95a 2022-09-29 op /* ARGSUSED */ \
666 83f0f95a 2022-09-29 op attr struct type * \
667 83f0f95a 2022-09-29 op name##_RB_NEXT(struct type *elm) \
669 83f0f95a 2022-09-29 op if (RB_RIGHT(elm, field)) { \
670 83f0f95a 2022-09-29 op elm = RB_RIGHT(elm, field); \
671 83f0f95a 2022-09-29 op while (RB_LEFT(elm, field)) \
672 83f0f95a 2022-09-29 op elm = RB_LEFT(elm, field); \
674 83f0f95a 2022-09-29 op if (RB_PARENT(elm, field) && \
675 83f0f95a 2022-09-29 op (elm == RB_LEFT(RB_PARENT(elm, field), field))) \
676 83f0f95a 2022-09-29 op elm = RB_PARENT(elm, field); \
678 83f0f95a 2022-09-29 op while (RB_PARENT(elm, field) && \
679 83f0f95a 2022-09-29 op (elm == RB_RIGHT(RB_PARENT(elm, field), field)))\
680 83f0f95a 2022-09-29 op elm = RB_PARENT(elm, field); \
681 83f0f95a 2022-09-29 op elm = RB_PARENT(elm, field); \
684 83f0f95a 2022-09-29 op return (elm); \
687 83f0f95a 2022-09-29 op /* ARGSUSED */ \
688 83f0f95a 2022-09-29 op attr struct type * \
689 83f0f95a 2022-09-29 op name##_RB_PREV(struct type *elm) \
691 83f0f95a 2022-09-29 op if (RB_LEFT(elm, field)) { \
692 83f0f95a 2022-09-29 op elm = RB_LEFT(elm, field); \
693 83f0f95a 2022-09-29 op while (RB_RIGHT(elm, field)) \
694 83f0f95a 2022-09-29 op elm = RB_RIGHT(elm, field); \
696 83f0f95a 2022-09-29 op if (RB_PARENT(elm, field) && \
697 83f0f95a 2022-09-29 op (elm == RB_RIGHT(RB_PARENT(elm, field), field))) \
698 83f0f95a 2022-09-29 op elm = RB_PARENT(elm, field); \
700 83f0f95a 2022-09-29 op while (RB_PARENT(elm, field) && \
701 83f0f95a 2022-09-29 op (elm == RB_LEFT(RB_PARENT(elm, field), field)))\
702 83f0f95a 2022-09-29 op elm = RB_PARENT(elm, field); \
703 83f0f95a 2022-09-29 op elm = RB_PARENT(elm, field); \
706 83f0f95a 2022-09-29 op return (elm); \
709 83f0f95a 2022-09-29 op attr struct type * \
710 83f0f95a 2022-09-29 op name##_RB_MINMAX(struct name *head, int val) \
712 83f0f95a 2022-09-29 op struct type *tmp = RB_ROOT(head); \
713 83f0f95a 2022-09-29 op struct type *parent = NULL; \
714 83f0f95a 2022-09-29 op while (tmp) { \
715 83f0f95a 2022-09-29 op parent = tmp; \
716 83f0f95a 2022-09-29 op if (val < 0) \
717 83f0f95a 2022-09-29 op tmp = RB_LEFT(tmp, field); \
719 83f0f95a 2022-09-29 op tmp = RB_RIGHT(tmp, field); \
721 83f0f95a 2022-09-29 op return (parent); \
724 83f0f95a 2022-09-29 op #define RB_NEGINF -1
725 83f0f95a 2022-09-29 op #define RB_INF 1
727 83f0f95a 2022-09-29 op #define RB_INSERT(name, x, y) name##_RB_INSERT(x, y)
728 83f0f95a 2022-09-29 op #define RB_REMOVE(name, x, y) name##_RB_REMOVE(x, y)
729 83f0f95a 2022-09-29 op #define RB_FIND(name, x, y) name##_RB_FIND(x, y)
730 83f0f95a 2022-09-29 op #define RB_NFIND(name, x, y) name##_RB_NFIND(x, y)
731 83f0f95a 2022-09-29 op #define RB_NEXT(name, x, y) name##_RB_NEXT(y)
732 83f0f95a 2022-09-29 op #define RB_PREV(name, x, y) name##_RB_PREV(y)
733 83f0f95a 2022-09-29 op #define RB_MIN(name, x) name##_RB_MINMAX(x, RB_NEGINF)
734 83f0f95a 2022-09-29 op #define RB_MAX(name, x) name##_RB_MINMAX(x, RB_INF)
736 83f0f95a 2022-09-29 op #define RB_FOREACH(x, name, head) \
737 83f0f95a 2022-09-29 op for ((x) = RB_MIN(name, head); \
738 83f0f95a 2022-09-29 op (x) != NULL; \
739 83f0f95a 2022-09-29 op (x) = name##_RB_NEXT(x))
741 83f0f95a 2022-09-29 op #define RB_FOREACH_SAFE(x, name, head, y) \
742 83f0f95a 2022-09-29 op for ((x) = RB_MIN(name, head); \
743 83f0f95a 2022-09-29 op ((x) != NULL) && ((y) = name##_RB_NEXT(x), 1); \
746 83f0f95a 2022-09-29 op #define RB_FOREACH_REVERSE(x, name, head) \
747 83f0f95a 2022-09-29 op for ((x) = RB_MAX(name, head); \
748 83f0f95a 2022-09-29 op (x) != NULL; \
749 83f0f95a 2022-09-29 op (x) = name##_RB_PREV(x))
751 83f0f95a 2022-09-29 op #define RB_FOREACH_REVERSE_SAFE(x, name, head, y) \
752 83f0f95a 2022-09-29 op for ((x) = RB_MAX(name, head); \
753 83f0f95a 2022-09-29 op ((x) != NULL) && ((y) = name##_RB_PREV(x), 1); \
758 83f0f95a 2022-09-29 op * Copyright (c) 2016 David Gwynne <dlg@openbsd.org>
760 83f0f95a 2022-09-29 op * Permission to use, copy, modify, and distribute this software for any
761 83f0f95a 2022-09-29 op * purpose with or without fee is hereby granted, provided that the above
762 83f0f95a 2022-09-29 op * copyright notice and this permission notice appear in all copies.
764 83f0f95a 2022-09-29 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
765 83f0f95a 2022-09-29 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
766 83f0f95a 2022-09-29 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
767 83f0f95a 2022-09-29 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
768 83f0f95a 2022-09-29 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
769 83f0f95a 2022-09-29 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
770 83f0f95a 2022-09-29 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
773 83f0f95a 2022-09-29 op struct rb_type {
774 83f0f95a 2022-09-29 op int (*t_compare)(const void *, const void *);
775 83f0f95a 2022-09-29 op void (*t_augment)(void *);
776 83f0f95a 2022-09-29 op unsigned int t_offset; /* offset of rb_entry in type */
779 83f0f95a 2022-09-29 op struct rb_tree {
780 83f0f95a 2022-09-29 op struct rb_entry *rbt_root;
783 83f0f95a 2022-09-29 op struct rb_entry {
784 83f0f95a 2022-09-29 op struct rb_entry *rbt_parent;
785 83f0f95a 2022-09-29 op struct rb_entry *rbt_left;
786 83f0f95a 2022-09-29 op struct rb_entry *rbt_right;
787 83f0f95a 2022-09-29 op unsigned int rbt_color;
790 83f0f95a 2022-09-29 op #define RBT_HEAD(_name, _type) \
791 83f0f95a 2022-09-29 op struct _name { \
792 83f0f95a 2022-09-29 op struct rb_tree rbh_root; \
795 83f0f95a 2022-09-29 op #define RBT_ENTRY(_type) struct rb_entry
797 83f0f95a 2022-09-29 op static inline void
798 83f0f95a 2022-09-29 op _rb_init(struct rb_tree *rbt)
800 83f0f95a 2022-09-29 op rbt->rbt_root = NULL;
803 83f0f95a 2022-09-29 op static inline int
804 83f0f95a 2022-09-29 op _rb_empty(struct rb_tree *rbt)
806 83f0f95a 2022-09-29 op return (rbt->rbt_root == NULL);
809 83f0f95a 2022-09-29 op void *_rb_insert(const struct rb_type *, struct rb_tree *, void *);
810 83f0f95a 2022-09-29 op void *_rb_remove(const struct rb_type *, struct rb_tree *, void *);
811 83f0f95a 2022-09-29 op void *_rb_find(const struct rb_type *, struct rb_tree *, const void *);
812 83f0f95a 2022-09-29 op void *_rb_nfind(const struct rb_type *, struct rb_tree *, const void *);
813 83f0f95a 2022-09-29 op void *_rb_root(const struct rb_type *, struct rb_tree *);
814 83f0f95a 2022-09-29 op void *_rb_min(const struct rb_type *, struct rb_tree *);
815 83f0f95a 2022-09-29 op void *_rb_max(const struct rb_type *, struct rb_tree *);
816 83f0f95a 2022-09-29 op void *_rb_next(const struct rb_type *, void *);
817 83f0f95a 2022-09-29 op void *_rb_prev(const struct rb_type *, void *);
818 83f0f95a 2022-09-29 op void *_rb_left(const struct rb_type *, void *);
819 83f0f95a 2022-09-29 op void *_rb_right(const struct rb_type *, void *);
820 83f0f95a 2022-09-29 op void *_rb_parent(const struct rb_type *, void *);
821 83f0f95a 2022-09-29 op void _rb_set_left(const struct rb_type *, void *, void *);
822 83f0f95a 2022-09-29 op void _rb_set_right(const struct rb_type *, void *, void *);
823 83f0f95a 2022-09-29 op void _rb_set_parent(const struct rb_type *, void *, void *);
824 83f0f95a 2022-09-29 op void _rb_poison(const struct rb_type *, void *, unsigned long);
825 83f0f95a 2022-09-29 op int _rb_check(const struct rb_type *, void *, unsigned long);
827 83f0f95a 2022-09-29 op #define RBT_INITIALIZER(_head) { { NULL } }
829 83f0f95a 2022-09-29 op #define RBT_PROTOTYPE(_name, _type, _field, _cmp) \
830 83f0f95a 2022-09-29 op extern const struct rb_type *const _name##_RBT_TYPE; \
832 83f0f95a 2022-09-29 op static inline void \
833 83f0f95a 2022-09-29 op _name##_RBT_INIT(struct _name *head) \
835 83f0f95a 2022-09-29 op _rb_init(&head->rbh_root); \
838 83f0f95a 2022-09-29 op static inline struct _type * \
839 83f0f95a 2022-09-29 op _name##_RBT_INSERT(struct _name *head, struct _type *elm) \
841 83f0f95a 2022-09-29 op return _rb_insert(_name##_RBT_TYPE, &head->rbh_root, elm); \
844 83f0f95a 2022-09-29 op static inline struct _type * \
845 83f0f95a 2022-09-29 op _name##_RBT_REMOVE(struct _name *head, struct _type *elm) \
847 83f0f95a 2022-09-29 op return _rb_remove(_name##_RBT_TYPE, &head->rbh_root, elm); \
850 83f0f95a 2022-09-29 op static inline struct _type * \
851 83f0f95a 2022-09-29 op _name##_RBT_FIND(struct _name *head, const struct _type *key) \
853 83f0f95a 2022-09-29 op return _rb_find(_name##_RBT_TYPE, &head->rbh_root, key); \
856 83f0f95a 2022-09-29 op static inline struct _type * \
857 83f0f95a 2022-09-29 op _name##_RBT_NFIND(struct _name *head, const struct _type *key) \
859 83f0f95a 2022-09-29 op return _rb_nfind(_name##_RBT_TYPE, &head->rbh_root, key); \
862 83f0f95a 2022-09-29 op static inline struct _type * \
863 83f0f95a 2022-09-29 op _name##_RBT_ROOT(struct _name *head) \
865 83f0f95a 2022-09-29 op return _rb_root(_name##_RBT_TYPE, &head->rbh_root); \
868 83f0f95a 2022-09-29 op static inline int \
869 83f0f95a 2022-09-29 op _name##_RBT_EMPTY(struct _name *head) \
871 83f0f95a 2022-09-29 op return _rb_empty(&head->rbh_root); \
874 83f0f95a 2022-09-29 op static inline struct _type * \
875 83f0f95a 2022-09-29 op _name##_RBT_MIN(struct _name *head) \
877 83f0f95a 2022-09-29 op return _rb_min(_name##_RBT_TYPE, &head->rbh_root); \
880 83f0f95a 2022-09-29 op static inline struct _type * \
881 83f0f95a 2022-09-29 op _name##_RBT_MAX(struct _name *head) \
883 83f0f95a 2022-09-29 op return _rb_max(_name##_RBT_TYPE, &head->rbh_root); \
886 83f0f95a 2022-09-29 op static inline struct _type * \
887 83f0f95a 2022-09-29 op _name##_RBT_NEXT(struct _type *elm) \
889 83f0f95a 2022-09-29 op return _rb_next(_name##_RBT_TYPE, elm); \
892 83f0f95a 2022-09-29 op static inline struct _type * \
893 83f0f95a 2022-09-29 op _name##_RBT_PREV(struct _type *elm) \
895 83f0f95a 2022-09-29 op return _rb_prev(_name##_RBT_TYPE, elm); \
898 83f0f95a 2022-09-29 op static inline struct _type * \
899 83f0f95a 2022-09-29 op _name##_RBT_LEFT(struct _type *elm) \
901 83f0f95a 2022-09-29 op return _rb_left(_name##_RBT_TYPE, elm); \
904 83f0f95a 2022-09-29 op static inline struct _type * \
905 83f0f95a 2022-09-29 op _name##_RBT_RIGHT(struct _type *elm) \
907 83f0f95a 2022-09-29 op return _rb_right(_name##_RBT_TYPE, elm); \
910 83f0f95a 2022-09-29 op static inline struct _type * \
911 83f0f95a 2022-09-29 op _name##_RBT_PARENT(struct _type *elm) \
913 83f0f95a 2022-09-29 op return _rb_parent(_name##_RBT_TYPE, elm); \
916 83f0f95a 2022-09-29 op static inline void \
917 83f0f95a 2022-09-29 op _name##_RBT_SET_LEFT(struct _type *elm, struct _type *left) \
919 83f0f95a 2022-09-29 op _rb_set_left(_name##_RBT_TYPE, elm, left); \
922 83f0f95a 2022-09-29 op static inline void \
923 83f0f95a 2022-09-29 op _name##_RBT_SET_RIGHT(struct _type *elm, struct _type *right) \
925 83f0f95a 2022-09-29 op _rb_set_right(_name##_RBT_TYPE, elm, right); \
928 83f0f95a 2022-09-29 op static inline void \
929 83f0f95a 2022-09-29 op _name##_RBT_SET_PARENT(struct _type *elm, struct _type *parent) \
931 83f0f95a 2022-09-29 op _rb_set_parent(_name##_RBT_TYPE, elm, parent); \
934 83f0f95a 2022-09-29 op static inline void \
935 83f0f95a 2022-09-29 op _name##_RBT_POISON(struct _type *elm, unsigned long poison) \
937 83f0f95a 2022-09-29 op _rb_poison(_name##_RBT_TYPE, elm, poison); \
940 83f0f95a 2022-09-29 op static inline int \
941 83f0f95a 2022-09-29 op _name##_RBT_CHECK(struct _type *elm, unsigned long poison) \
943 83f0f95a 2022-09-29 op return _rb_check(_name##_RBT_TYPE, elm, poison); \
946 83f0f95a 2022-09-29 op #define RBT_GENERATE_INTERNAL(_name, _type, _field, _cmp, _aug) \
948 83f0f95a 2022-09-29 op _name##_RBT_COMPARE(const void *lptr, const void *rptr) \
950 83f0f95a 2022-09-29 op const struct _type *l = lptr, *r = rptr; \
951 83f0f95a 2022-09-29 op return _cmp(l, r); \
953 83f0f95a 2022-09-29 op static const struct rb_type _name##_RBT_INFO = { \
954 83f0f95a 2022-09-29 op _name##_RBT_COMPARE, \
956 83f0f95a 2022-09-29 op offsetof(struct _type, _field), \
958 83f0f95a 2022-09-29 op const struct rb_type *const _name##_RBT_TYPE = &_name##_RBT_INFO
960 83f0f95a 2022-09-29 op #define RBT_GENERATE_AUGMENT(_name, _type, _field, _cmp, _aug) \
961 83f0f95a 2022-09-29 op static void \
962 83f0f95a 2022-09-29 op _name##_RBT_AUGMENT(void *ptr) \
964 83f0f95a 2022-09-29 op struct _type *p = ptr; \
965 83f0f95a 2022-09-29 op return _aug(p); \
967 83f0f95a 2022-09-29 op RBT_GENERATE_INTERNAL(_name, _type, _field, _cmp, _name##_RBT_AUGMENT)
969 83f0f95a 2022-09-29 op #define RBT_GENERATE(_name, _type, _field, _cmp) \
970 83f0f95a 2022-09-29 op RBT_GENERATE_INTERNAL(_name, _type, _field, _cmp, NULL)
972 83f0f95a 2022-09-29 op #define RBT_INIT(_name, _head) _name##_RBT_INIT(_head)
973 83f0f95a 2022-09-29 op #define RBT_INSERT(_name, _head, _elm) _name##_RBT_INSERT(_head, _elm)
974 83f0f95a 2022-09-29 op #define RBT_REMOVE(_name, _head, _elm) _name##_RBT_REMOVE(_head, _elm)
975 83f0f95a 2022-09-29 op #define RBT_FIND(_name, _head, _key) _name##_RBT_FIND(_head, _key)
976 83f0f95a 2022-09-29 op #define RBT_NFIND(_name, _head, _key) _name##_RBT_NFIND(_head, _key)
977 83f0f95a 2022-09-29 op #define RBT_ROOT(_name, _head) _name##_RBT_ROOT(_head)
978 83f0f95a 2022-09-29 op #define RBT_EMPTY(_name, _head) _name##_RBT_EMPTY(_head)
979 83f0f95a 2022-09-29 op #define RBT_MIN(_name, _head) _name##_RBT_MIN(_head)
980 83f0f95a 2022-09-29 op #define RBT_MAX(_name, _head) _name##_RBT_MAX(_head)
981 83f0f95a 2022-09-29 op #define RBT_NEXT(_name, _elm) _name##_RBT_NEXT(_elm)
982 83f0f95a 2022-09-29 op #define RBT_PREV(_name, _elm) _name##_RBT_PREV(_elm)
983 83f0f95a 2022-09-29 op #define RBT_LEFT(_name, _elm) _name##_RBT_LEFT(_elm)
984 83f0f95a 2022-09-29 op #define RBT_RIGHT(_name, _elm) _name##_RBT_RIGHT(_elm)
985 83f0f95a 2022-09-29 op #define RBT_PARENT(_name, _elm) _name##_RBT_PARENT(_elm)
986 83f0f95a 2022-09-29 op #define RBT_SET_LEFT(_name, _elm, _l) _name##_RBT_SET_LEFT(_elm, _l)
987 83f0f95a 2022-09-29 op #define RBT_SET_RIGHT(_name, _elm, _r) _name##_RBT_SET_RIGHT(_elm, _r)
988 83f0f95a 2022-09-29 op #define RBT_SET_PARENT(_name, _elm, _p) _name##_RBT_SET_PARENT(_elm, _p)
989 83f0f95a 2022-09-29 op #define RBT_POISON(_name, _elm, _p) _name##_RBT_POISON(_elm, _p)
990 83f0f95a 2022-09-29 op #define RBT_CHECK(_name, _elm, _p) _name##_RBT_CHECK(_elm, _p)
992 83f0f95a 2022-09-29 op #define RBT_FOREACH(_e, _name, _head) \
993 83f0f95a 2022-09-29 op for ((_e) = RBT_MIN(_name, (_head)); \
994 83f0f95a 2022-09-29 op (_e) != NULL; \
995 83f0f95a 2022-09-29 op (_e) = RBT_NEXT(_name, (_e)))
997 83f0f95a 2022-09-29 op #define RBT_FOREACH_SAFE(_e, _name, _head, _n) \
998 83f0f95a 2022-09-29 op for ((_e) = RBT_MIN(_name, (_head)); \
999 83f0f95a 2022-09-29 op (_e) != NULL && ((_n) = RBT_NEXT(_name, (_e)), 1); \
1000 83f0f95a 2022-09-29 op (_e) = (_n))
1002 83f0f95a 2022-09-29 op #define RBT_FOREACH_REVERSE(_e, _name, _head) \
1003 83f0f95a 2022-09-29 op for ((_e) = RBT_MAX(_name, (_head)); \
1004 83f0f95a 2022-09-29 op (_e) != NULL; \
1005 83f0f95a 2022-09-29 op (_e) = RBT_PREV(_name, (_e)))
1007 83f0f95a 2022-09-29 op #define RBT_FOREACH_REVERSE_SAFE(_e, _name, _head, _n) \
1008 83f0f95a 2022-09-29 op for ((_e) = RBT_MAX(_name, (_head)); \
1009 83f0f95a 2022-09-29 op (_e) != NULL && ((_n) = RBT_PREV(_name, (_e)), 1); \
1010 83f0f95a 2022-09-29 op (_e) = (_n))
1012 83f0f95a 2022-09-29 op #endif /* _SYS_TREE_H_ */
