sys-tree.h revision 106121
1/* $OpenBSD: tree.h,v 1.6 2002/06/11 22:09:52 provos Exp $ */ 2/* 3 * Copyright 2002 Niels Provos <provos@citi.umich.edu> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#ifndef _SYS_TREE_H_ 28#define _SYS_TREE_H_ 29 30/* 31 * This file defines data structures for different types of trees: 32 * splay trees and red-black trees. 33 * 34 * A splay tree is a self-organizing data structure. Every operation 35 * on the tree causes a splay to happen. The splay moves the requested 36 * node to the root of the tree and partly rebalances it. 37 * 38 * This has the benefit that request locality causes faster lookups as 39 * the requested nodes move to the top of the tree. On the other hand, 40 * every lookup causes memory writes. 41 * 42 * The Balance Theorem bounds the total access time for m operations 43 * and n inserts on an initially empty tree as O((m + n)lg n). The 44 * amortized cost for a sequence of m accesses to a splay tree is O(lg n); 45 * 46 * A red-black tree is a binary search tree with the node color as an 47 * extra attribute. It fulfills a set of conditions: 48 * - every search path from the root to a leaf consists of the 49 * same number of black nodes, 50 * - each red node (except for the root) has a black parent, 51 * - each leaf node is black. 52 * 53 * Every operation on a red-black tree is bounded as O(lg n). 54 * The maximum height of a red-black tree is 2lg (n+1). 55 */ 56 57#define SPLAY_HEAD(name, type) \ 58struct name { \ 59 struct type *sph_root; /* root of the tree */ \ 60} 61 62#define SPLAY_INITIALIZER(root) \ 63 { NULL } 64 65#define SPLAY_INIT(root) do { \ 66 (root)->sph_root = NULL; \ 67} while (0) 68 69#define SPLAY_ENTRY(type) \ 70struct { \ 71 struct type *spe_left; /* left element */ \ 72 struct type *spe_right; /* right element */ \ 73} 74 75#define SPLAY_LEFT(elm, field) (elm)->field.spe_left 76#define SPLAY_RIGHT(elm, field) (elm)->field.spe_right 77#define SPLAY_ROOT(head) (head)->sph_root 78#define SPLAY_EMPTY(head) (SPLAY_ROOT(head) == NULL) 79 80/* SPLAY_ROTATE_{LEFT,RIGHT} expect that tmp hold SPLAY_{RIGHT,LEFT} */ 81#define SPLAY_ROTATE_RIGHT(head, tmp, field) do { \ 82 SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(tmp, field); \ 83 SPLAY_RIGHT(tmp, field) = (head)->sph_root; \ 84 (head)->sph_root = tmp; \ 85} while (0) 86 87#define SPLAY_ROTATE_LEFT(head, tmp, field) do { \ 88 SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(tmp, field); \ 89 SPLAY_LEFT(tmp, field) = (head)->sph_root; \ 90 (head)->sph_root = tmp; \ 91} while (0) 92 93#define SPLAY_LINKLEFT(head, tmp, field) do { \ 94 SPLAY_LEFT(tmp, field) = (head)->sph_root; \ 95 tmp = (head)->sph_root; \ 96 (head)->sph_root = SPLAY_LEFT((head)->sph_root, field); \ 97} while (0) 98 99#define SPLAY_LINKRIGHT(head, tmp, field) do { \ 100 SPLAY_RIGHT(tmp, field) = (head)->sph_root; \ 101 tmp = (head)->sph_root; \ 102 (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field); \ 103} while (0) 104 105#define SPLAY_ASSEMBLE(head, node, left, right, field) do { \ 106 SPLAY_RIGHT(left, field) = SPLAY_LEFT((head)->sph_root, field); \ 107 SPLAY_LEFT(right, field) = SPLAY_RIGHT((head)->sph_root, field);\ 108 SPLAY_LEFT((head)->sph_root, field) = SPLAY_RIGHT(node, field); \ 109 SPLAY_RIGHT((head)->sph_root, field) = SPLAY_LEFT(node, field); \ 110} while (0) 111 112/* Generates prototypes and inline functions */ 113 114#define SPLAY_PROTOTYPE(name, type, field, cmp) \ 115void name##_SPLAY(struct name *, struct type *); \ 116void name##_SPLAY_MINMAX(struct name *, int); \ 117struct type *name##_SPLAY_INSERT(struct name *, struct type *); \ 118struct type *name##_SPLAY_REMOVE(struct name *, struct type *); \ 119 \ 120/* Finds the node with the same key as elm */ \ 121static __inline struct type * \ 122name##_SPLAY_FIND(struct name *head, struct type *elm) \ 123{ \ 124 if (SPLAY_EMPTY(head)) \ 125 return(NULL); \ 126 name##_SPLAY(head, elm); \ 127 if ((cmp)(elm, (head)->sph_root) == 0) \ 128 return (head->sph_root); \ 129 return (NULL); \ 130} \ 131 \ 132static __inline struct type * \ 133name##_SPLAY_NEXT(struct name *head, struct type *elm) \ 134{ \ 135 name##_SPLAY(head, elm); \ 136 if (SPLAY_RIGHT(elm, field) != NULL) { \ 137 elm = SPLAY_RIGHT(elm, field); \ 138 while (SPLAY_LEFT(elm, field) != NULL) { \ 139 elm = SPLAY_LEFT(elm, field); \ 140 } \ 141 } else \ 142 elm = NULL; \ 143 return (elm); \ 144} \ 145 \ 146static __inline struct type * \ 147name##_SPLAY_MIN_MAX(struct name *head, int val) \ 148{ \ 149 name##_SPLAY_MINMAX(head, val); \ 150 return (SPLAY_ROOT(head)); \ 151} 152 153/* Main splay operation. 154 * Moves node close to the key of elm to top 155 */ 156#define SPLAY_GENERATE(name, type, field, cmp) \ 157struct type * \ 158name##_SPLAY_INSERT(struct name *head, struct type *elm) \ 159{ \ 160 if (SPLAY_EMPTY(head)) { \ 161 SPLAY_LEFT(elm, field) = SPLAY_RIGHT(elm, field) = NULL; \ 162 } else { \ 163 int __comp; \ 164 name##_SPLAY(head, elm); \ 165 __comp = (cmp)(elm, (head)->sph_root); \ 166 if(__comp < 0) { \ 167 SPLAY_LEFT(elm, field) = SPLAY_LEFT((head)->sph_root, field);\ 168 SPLAY_RIGHT(elm, field) = (head)->sph_root; \ 169 SPLAY_LEFT((head)->sph_root, field) = NULL; \ 170 } else if (__comp > 0) { \ 171 SPLAY_RIGHT(elm, field) = SPLAY_RIGHT((head)->sph_root, field);\ 172 SPLAY_LEFT(elm, field) = (head)->sph_root; \ 173 SPLAY_RIGHT((head)->sph_root, field) = NULL; \ 174 } else \ 175 return ((head)->sph_root); \ 176 } \ 177 (head)->sph_root = (elm); \ 178 return (NULL); \ 179} \ 180 \ 181struct type * \ 182name##_SPLAY_REMOVE(struct name *head, struct type *elm) \ 183{ \ 184 struct type *__tmp; \ 185 if (SPLAY_EMPTY(head)) \ 186 return (NULL); \ 187 name##_SPLAY(head, elm); \ 188 if ((cmp)(elm, (head)->sph_root) == 0) { \ 189 if (SPLAY_LEFT((head)->sph_root, field) == NULL) { \ 190 (head)->sph_root = SPLAY_RIGHT((head)->sph_root, field);\ 191 } else { \ 192 __tmp = SPLAY_RIGHT((head)->sph_root, field); \ 193 (head)->sph_root = SPLAY_LEFT((head)->sph_root, field);\ 194 name##_SPLAY(head, elm); \ 195 SPLAY_RIGHT((head)->sph_root, field) = __tmp; \ 196 } \ 197 return (elm); \ 198 } \ 199 return (NULL); \ 200} \ 201 \ 202void \ 203name##_SPLAY(struct name *head, struct type *elm) \ 204{ \ 205 struct type __node, *__left, *__right, *__tmp; \ 206 int __comp; \ 207\ 208 SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\ 209 __left = __right = &__node; \ 210\ 211 while ((__comp = (cmp)(elm, (head)->sph_root))) { \ 212 if (__comp < 0) { \ 213 __tmp = SPLAY_LEFT((head)->sph_root, field); \ 214 if (__tmp == NULL) \ 215 break; \ 216 if ((cmp)(elm, __tmp) < 0){ \ 217 SPLAY_ROTATE_RIGHT(head, __tmp, field); \ 218 if (SPLAY_LEFT((head)->sph_root, field) == NULL)\ 219 break; \ 220 } \ 221 SPLAY_LINKLEFT(head, __right, field); \ 222 } else if (__comp > 0) { \ 223 __tmp = SPLAY_RIGHT((head)->sph_root, field); \ 224 if (__tmp == NULL) \ 225 break; \ 226 if ((cmp)(elm, __tmp) > 0){ \ 227 SPLAY_ROTATE_LEFT(head, __tmp, field); \ 228 if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\ 229 break; \ 230 } \ 231 SPLAY_LINKRIGHT(head, __left, field); \ 232 } \ 233 } \ 234 SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \ 235} \ 236 \ 237/* Splay with either the minimum or the maximum element \ 238 * Used to find minimum or maximum element in tree. \ 239 */ \ 240void name##_SPLAY_MINMAX(struct name *head, int __comp) \ 241{ \ 242 struct type __node, *__left, *__right, *__tmp; \ 243\ 244 SPLAY_LEFT(&__node, field) = SPLAY_RIGHT(&__node, field) = NULL;\ 245 __left = __right = &__node; \ 246\ 247 while (1) { \ 248 if (__comp < 0) { \ 249 __tmp = SPLAY_LEFT((head)->sph_root, field); \ 250 if (__tmp == NULL) \ 251 break; \ 252 if (__comp < 0){ \ 253 SPLAY_ROTATE_RIGHT(head, __tmp, field); \ 254 if (SPLAY_LEFT((head)->sph_root, field) == NULL)\ 255 break; \ 256 } \ 257 SPLAY_LINKLEFT(head, __right, field); \ 258 } else if (__comp > 0) { \ 259 __tmp = SPLAY_RIGHT((head)->sph_root, field); \ 260 if (__tmp == NULL) \ 261 break; \ 262 if (__comp > 0) { \ 263 SPLAY_ROTATE_LEFT(head, __tmp, field); \ 264 if (SPLAY_RIGHT((head)->sph_root, field) == NULL)\ 265 break; \ 266 } \ 267 SPLAY_LINKRIGHT(head, __left, field); \ 268 } \ 269 } \ 270 SPLAY_ASSEMBLE(head, &__node, __left, __right, field); \ 271} 272 273#define SPLAY_NEGINF -1 274#define SPLAY_INF 1 275 276#define SPLAY_INSERT(name, x, y) name##_SPLAY_INSERT(x, y) 277#define SPLAY_REMOVE(name, x, y) name##_SPLAY_REMOVE(x, y) 278#define SPLAY_FIND(name, x, y) name##_SPLAY_FIND(x, y) 279#define SPLAY_NEXT(name, x, y) name##_SPLAY_NEXT(x, y) 280#define SPLAY_MIN(name, x) (SPLAY_EMPTY(x) ? NULL \ 281 : name##_SPLAY_MIN_MAX(x, SPLAY_NEGINF)) 282#define SPLAY_MAX(name, x) (SPLAY_EMPTY(x) ? NULL \ 283 : name##_SPLAY_MIN_MAX(x, SPLAY_INF)) 284 285#define SPLAY_FOREACH(x, name, head) \ 286 for ((x) = SPLAY_MIN(name, head); \ 287 (x) != NULL; \ 288 (x) = SPLAY_NEXT(name, head, x)) 289 290/* Macros that define a red-back tree */ 291#define RB_HEAD(name, type) \ 292struct name { \ 293 struct type *rbh_root; /* root of the tree */ \ 294} 295 296#define RB_INITIALIZER(root) \ 297 { NULL } 298 299#define RB_INIT(root) do { \ 300 (root)->rbh_root = NULL; \ 301} while (0) 302 303#define RB_BLACK 0 304#define RB_RED 1 305#define RB_ENTRY(type) \ 306struct { \ 307 struct type *rbe_left; /* left element */ \ 308 struct type *rbe_right; /* right element */ \ 309 struct type *rbe_parent; /* parent element */ \ 310 int rbe_color; /* node color */ \ 311} 312 313#define RB_LEFT(elm, field) (elm)->field.rbe_left 314#define RB_RIGHT(elm, field) (elm)->field.rbe_right 315#define RB_PARENT(elm, field) (elm)->field.rbe_parent 316#define RB_COLOR(elm, field) (elm)->field.rbe_color 317#define RB_ROOT(head) (head)->rbh_root 318#define RB_EMPTY(head) (RB_ROOT(head) == NULL) 319 320#define RB_SET(elm, parent, field) do { \ 321 RB_PARENT(elm, field) = parent; \ 322 RB_LEFT(elm, field) = RB_RIGHT(elm, field) = NULL; \ 323 RB_COLOR(elm, field) = RB_RED; \ 324} while (0) 325 326#define RB_SET_BLACKRED(black, red, field) do { \ 327 RB_COLOR(black, field) = RB_BLACK; \ 328 RB_COLOR(red, field) = RB_RED; \ 329} while (0) 330 331#ifndef RB_AUGMENT 332#define RB_AUGMENT(x) 333#endif 334 335#define RB_ROTATE_LEFT(head, elm, tmp, field) do { \ 336 (tmp) = RB_RIGHT(elm, field); \ 337 if ((RB_RIGHT(elm, field) = RB_LEFT(tmp, field))) { \ 338 RB_PARENT(RB_LEFT(tmp, field), field) = (elm); \ 339 } \ 340 RB_AUGMENT(elm); \ 341 if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) { \ 342 if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \ 343 RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \ 344 else \ 345 RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \ 346 RB_AUGMENT(RB_PARENT(elm, field)); \ 347 } else \ 348 (head)->rbh_root = (tmp); \ 349 RB_LEFT(tmp, field) = (elm); \ 350 RB_PARENT(elm, field) = (tmp); \ 351 RB_AUGMENT(tmp); \ 352} while (0) 353 354#define RB_ROTATE_RIGHT(head, elm, tmp, field) do { \ 355 (tmp) = RB_LEFT(elm, field); \ 356 if ((RB_LEFT(elm, field) = RB_RIGHT(tmp, field))) { \ 357 RB_PARENT(RB_RIGHT(tmp, field), field) = (elm); \ 358 } \ 359 RB_AUGMENT(elm); \ 360 if ((RB_PARENT(tmp, field) = RB_PARENT(elm, field))) { \ 361 if ((elm) == RB_LEFT(RB_PARENT(elm, field), field)) \ 362 RB_LEFT(RB_PARENT(elm, field), field) = (tmp); \ 363 else \ 364 RB_RIGHT(RB_PARENT(elm, field), field) = (tmp); \ 365 RB_AUGMENT(RB_PARENT(elm, field)); \ 366 } else \ 367 (head)->rbh_root = (tmp); \ 368 RB_RIGHT(tmp, field) = (elm); \ 369 RB_PARENT(elm, field) = (tmp); \ 370 RB_AUGMENT(tmp); \ 371} while (0) 372 373/* Generates prototypes and inline functions */ 374#define RB_PROTOTYPE(name, type, field, cmp) \ 375void name##_RB_INSERT_COLOR(struct name *, struct type *); \ 376void name##_RB_REMOVE_COLOR(struct name *, struct type *, struct type *);\ 377struct type *name##_RB_REMOVE(struct name *, struct type *); \ 378struct type *name##_RB_INSERT(struct name *, struct type *); \ 379struct type *name##_RB_FIND(struct name *, struct type *); \ 380struct type *name##_RB_NEXT(struct name *, struct type *); \ 381struct type *name##_RB_MINMAX(struct name *, int); \ 382 \ 383 384/* Main rb operation. 385 * Moves node close to the key of elm to top 386 */ 387#define RB_GENERATE(name, type, field, cmp) \ 388void \ 389name##_RB_INSERT_COLOR(struct name *head, struct type *elm) \ 390{ \ 391 struct type *parent, *gparent, *tmp; \ 392 while ((parent = RB_PARENT(elm, field)) && \ 393 RB_COLOR(parent, field) == RB_RED) { \ 394 gparent = RB_PARENT(parent, field); \ 395 if (parent == RB_LEFT(gparent, field)) { \ 396 tmp = RB_RIGHT(gparent, field); \ 397 if (tmp && RB_COLOR(tmp, field) == RB_RED) { \ 398 RB_COLOR(tmp, field) = RB_BLACK; \ 399 RB_SET_BLACKRED(parent, gparent, field);\ 400 elm = gparent; \ 401 continue; \ 402 } \ 403 if (RB_RIGHT(parent, field) == elm) { \ 404 RB_ROTATE_LEFT(head, parent, tmp, field);\ 405 tmp = parent; \ 406 parent = elm; \ 407 elm = tmp; \ 408 } \ 409 RB_SET_BLACKRED(parent, gparent, field); \ 410 RB_ROTATE_RIGHT(head, gparent, tmp, field); \ 411 } else { \ 412 tmp = RB_LEFT(gparent, field); \ 413 if (tmp && RB_COLOR(tmp, field) == RB_RED) { \ 414 RB_COLOR(tmp, field) = RB_BLACK; \ 415 RB_SET_BLACKRED(parent, gparent, field);\ 416 elm = gparent; \ 417 continue; \ 418 } \ 419 if (RB_LEFT(parent, field) == elm) { \ 420 RB_ROTATE_RIGHT(head, parent, tmp, field);\ 421 tmp = parent; \ 422 parent = elm; \ 423 elm = tmp; \ 424 } \ 425 RB_SET_BLACKRED(parent, gparent, field); \ 426 RB_ROTATE_LEFT(head, gparent, tmp, field); \ 427 } \ 428 } \ 429 RB_COLOR(head->rbh_root, field) = RB_BLACK; \ 430} \ 431 \ 432void \ 433name##_RB_REMOVE_COLOR(struct name *head, struct type *parent, struct type *elm) \ 434{ \ 435 struct type *tmp; \ 436 while ((elm == NULL || RB_COLOR(elm, field) == RB_BLACK) && \ 437 elm != RB_ROOT(head)) { \ 438 if (RB_LEFT(parent, field) == elm) { \ 439 tmp = RB_RIGHT(parent, field); \ 440 if (RB_COLOR(tmp, field) == RB_RED) { \ 441 RB_SET_BLACKRED(tmp, parent, field); \ 442 RB_ROTATE_LEFT(head, parent, tmp, field);\ 443 tmp = RB_RIGHT(parent, field); \ 444 } \ 445 if ((RB_LEFT(tmp, field) == NULL || \ 446 RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\ 447 (RB_RIGHT(tmp, field) == NULL || \ 448 RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\ 449 RB_COLOR(tmp, field) = RB_RED; \ 450 elm = parent; \ 451 parent = RB_PARENT(elm, field); \ 452 } else { \ 453 if (RB_RIGHT(tmp, field) == NULL || \ 454 RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK) {\ 455 struct type *oleft; \ 456 if ((oleft = RB_LEFT(tmp, field)))\ 457 RB_COLOR(oleft, field) = RB_BLACK;\ 458 RB_COLOR(tmp, field) = RB_RED; \ 459 RB_ROTATE_RIGHT(head, tmp, oleft, field);\ 460 tmp = RB_RIGHT(parent, field); \ 461 } \ 462 RB_COLOR(tmp, field) = RB_COLOR(parent, field);\ 463 RB_COLOR(parent, field) = RB_BLACK; \ 464 if (RB_RIGHT(tmp, field)) \ 465 RB_COLOR(RB_RIGHT(tmp, field), field) = RB_BLACK;\ 466 RB_ROTATE_LEFT(head, parent, tmp, field);\ 467 elm = RB_ROOT(head); \ 468 break; \ 469 } \ 470 } else { \ 471 tmp = RB_LEFT(parent, field); \ 472 if (RB_COLOR(tmp, field) == RB_RED) { \ 473 RB_SET_BLACKRED(tmp, parent, field); \ 474 RB_ROTATE_RIGHT(head, parent, tmp, field);\ 475 tmp = RB_LEFT(parent, field); \ 476 } \ 477 if ((RB_LEFT(tmp, field) == NULL || \ 478 RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) &&\ 479 (RB_RIGHT(tmp, field) == NULL || \ 480 RB_COLOR(RB_RIGHT(tmp, field), field) == RB_BLACK)) {\ 481 RB_COLOR(tmp, field) = RB_RED; \ 482 elm = parent; \ 483 parent = RB_PARENT(elm, field); \ 484 } else { \ 485 if (RB_LEFT(tmp, field) == NULL || \ 486 RB_COLOR(RB_LEFT(tmp, field), field) == RB_BLACK) {\ 487 struct type *oright; \ 488 if ((oright = RB_RIGHT(tmp, field)))\ 489 RB_COLOR(oright, field) = RB_BLACK;\ 490 RB_COLOR(tmp, field) = RB_RED; \ 491 RB_ROTATE_LEFT(head, tmp, oright, field);\ 492 tmp = RB_LEFT(parent, field); \ 493 } \ 494 RB_COLOR(tmp, field) = RB_COLOR(parent, field);\ 495 RB_COLOR(parent, field) = RB_BLACK; \ 496 if (RB_LEFT(tmp, field)) \ 497 RB_COLOR(RB_LEFT(tmp, field), field) = RB_BLACK;\ 498 RB_ROTATE_RIGHT(head, parent, tmp, field);\ 499 elm = RB_ROOT(head); \ 500 break; \ 501 } \ 502 } \ 503 } \ 504 if (elm) \ 505 RB_COLOR(elm, field) = RB_BLACK; \ 506} \ 507 \ 508struct type * \ 509name##_RB_REMOVE(struct name *head, struct type *elm) \ 510{ \ 511 struct type *child, *parent, *old = elm; \ 512 int color; \ 513 if (RB_LEFT(elm, field) == NULL) \ 514 child = RB_RIGHT(elm, field); \ 515 else if (RB_RIGHT(elm, field) == NULL) \ 516 child = RB_LEFT(elm, field); \ 517 else { \ 518 struct type *left; \ 519 elm = RB_RIGHT(elm, field); \ 520 while ((left = RB_LEFT(elm, field))) \ 521 elm = left; \ 522 child = RB_RIGHT(elm, field); \ 523 parent = RB_PARENT(elm, field); \ 524 color = RB_COLOR(elm, field); \ 525 if (child) \ 526 RB_PARENT(child, field) = parent; \ 527 if (parent) { \ 528 if (RB_LEFT(parent, field) == elm) \ 529 RB_LEFT(parent, field) = child; \ 530 else \ 531 RB_RIGHT(parent, field) = child; \ 532 RB_AUGMENT(parent); \ 533 } else \ 534 RB_ROOT(head) = child; \ 535 if (RB_PARENT(elm, field) == old) \ 536 parent = elm; \ 537 (elm)->field = (old)->field; \ 538 if (RB_PARENT(old, field)) { \ 539 if (RB_LEFT(RB_PARENT(old, field), field) == old)\ 540 RB_LEFT(RB_PARENT(old, field), field) = elm;\ 541 else \ 542 RB_RIGHT(RB_PARENT(old, field), field) = elm;\ 543 RB_AUGMENT(RB_PARENT(old, field)); \ 544 } else \ 545 RB_ROOT(head) = elm; \ 546 RB_PARENT(RB_LEFT(old, field), field) = elm; \ 547 if (RB_RIGHT(old, field)) \ 548 RB_PARENT(RB_RIGHT(old, field), field) = elm; \ 549 if (parent) { \ 550 left = parent; \ 551 do { \ 552 RB_AUGMENT(left); \ 553 } while ((left = RB_PARENT(left, field))); \ 554 } \ 555 goto color; \ 556 } \ 557 parent = RB_PARENT(elm, field); \ 558 color = RB_COLOR(elm, field); \ 559 if (child) \ 560 RB_PARENT(child, field) = parent; \ 561 if (parent) { \ 562 if (RB_LEFT(parent, field) == elm) \ 563 RB_LEFT(parent, field) = child; \ 564 else \ 565 RB_RIGHT(parent, field) = child; \ 566 RB_AUGMENT(parent); \ 567 } else \ 568 RB_ROOT(head) = child; \ 569color: \ 570 if (color == RB_BLACK) \ 571 name##_RB_REMOVE_COLOR(head, parent, child); \ 572 return (old); \ 573} \ 574 \ 575/* Inserts a node into the RB tree */ \ 576struct type * \ 577name##_RB_INSERT(struct name *head, struct type *elm) \ 578{ \ 579 struct type *tmp; \ 580 struct type *parent = NULL; \ 581 int comp = 0; \ 582 tmp = RB_ROOT(head); \ 583 while (tmp) { \ 584 parent = tmp; \ 585 comp = (cmp)(elm, parent); \ 586 if (comp < 0) \ 587 tmp = RB_LEFT(tmp, field); \ 588 else if (comp > 0) \ 589 tmp = RB_RIGHT(tmp, field); \ 590 else \ 591 return (tmp); \ 592 } \ 593 RB_SET(elm, parent, field); \ 594 if (parent != NULL) { \ 595 if (comp < 0) \ 596 RB_LEFT(parent, field) = elm; \ 597 else \ 598 RB_RIGHT(parent, field) = elm; \ 599 RB_AUGMENT(parent); \ 600 } else \ 601 RB_ROOT(head) = elm; \ 602 name##_RB_INSERT_COLOR(head, elm); \ 603 return (NULL); \ 604} \ 605 \ 606/* Finds the node with the same key as elm */ \ 607struct type * \ 608name##_RB_FIND(struct name *head, struct type *elm) \ 609{ \ 610 struct type *tmp = RB_ROOT(head); \ 611 int comp; \ 612 while (tmp) { \ 613 comp = cmp(elm, tmp); \ 614 if (comp < 0) \ 615 tmp = RB_LEFT(tmp, field); \ 616 else if (comp > 0) \ 617 tmp = RB_RIGHT(tmp, field); \ 618 else \ 619 return (tmp); \ 620 } \ 621 return (NULL); \ 622} \ 623 \ 624struct type * \ 625name##_RB_NEXT(struct name *head, struct type *elm) \ 626{ \ 627 if (RB_RIGHT(elm, field)) { \ 628 elm = RB_RIGHT(elm, field); \ 629 while (RB_LEFT(elm, field)) \ 630 elm = RB_LEFT(elm, field); \ 631 } else { \ 632 if (RB_PARENT(elm, field) && \ 633 (elm == RB_LEFT(RB_PARENT(elm, field), field))) \ 634 elm = RB_PARENT(elm, field); \ 635 else { \ 636 while (RB_PARENT(elm, field) && \ 637 (elm == RB_RIGHT(RB_PARENT(elm, field), field)))\ 638 elm = RB_PARENT(elm, field); \ 639 elm = RB_PARENT(elm, field); \ 640 } \ 641 } \ 642 return (elm); \ 643} \ 644 \ 645struct type * \ 646name##_RB_MINMAX(struct name *head, int val) \ 647{ \ 648 struct type *tmp = RB_ROOT(head); \ 649 struct type *parent = NULL; \ 650 while (tmp) { \ 651 parent = tmp; \ 652 if (val < 0) \ 653 tmp = RB_LEFT(tmp, field); \ 654 else \ 655 tmp = RB_RIGHT(tmp, field); \ 656 } \ 657 return (parent); \ 658} 659 660#define RB_NEGINF -1 661#define RB_INF 1 662 663#define RB_INSERT(name, x, y) name##_RB_INSERT(x, y) 664#define RB_REMOVE(name, x, y) name##_RB_REMOVE(x, y) 665#define RB_FIND(name, x, y) name##_RB_FIND(x, y) 666#define RB_NEXT(name, x, y) name##_RB_NEXT(x, y) 667#define RB_MIN(name, x) name##_RB_MINMAX(x, RB_NEGINF) 668#define RB_MAX(name, x) name##_RB_MINMAX(x, RB_INF) 669 670#define RB_FOREACH(x, name, head) \ 671 for ((x) = RB_MIN(name, head); \ 672 (x) != NULL; \ 673 (x) = name##_RB_NEXT(head, x)) 674 675#endif /* _SYS_TREE_H_ */ 676