/usr/include/sofia-sip-1.12/sofia-sip/rbtree.h is in libsofia-sip-ua-dev 1.12.11+20110422.1-2.1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 | /*
* This file is part of the Sofia-SIP package
*
* Copyright (C) 2005 Nokia Corporation.
*
* Contact: Pekka Pessi <pekka.pessi@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#ifndef RBTREE_H
/** Defined when <sofia-sip/rbtree.h> has been included. */
#define RBTREE_H
/**@file sofia-sip/rbtree.h
*
* Red-black tree.
*
* This file contain a red-black-tree template for C. The red-black-tree is
* a balanced binary tree containing structures as nodes.
*
* The prototypes for red-black-tree functions are declared with macro
* RBTREE_PROTOS(). The implementation is instantiated with macro
* RBTREE_BODIES().
*
* When a entry with new identical key is added to the tree, it can be
* either @e inserted (replacing other node with same key value) or @e
* appended.
*
* Example code can be found from <rbtree_test.c>.
*
* @author Pekka Pessi <Pekka.Pessi@nokia.com>.
*
* @date Created: Tue Sep 7 19:45:11 EEST 2004 ppessi
*
*/
#if DOCUMENTATION_ONLY
/** Type used for rbtree nodes. */
typedef struct node Type;
#endif
/* x c
* / \ / \
* Convert a c into x d
* / \ / \
* b d a b
*/
#define RBTREE_LEFT_ROTATE(prefix, Type, left, right, parent) \
su_inline \
void prefix ## _left_rotate(Type **top, Type *x) \
{ \
Type *c = right(x), *dad = parent(x); assert(c); \
\
if ((right(x) = left(c))) \
parent(right(x)) = x; \
\
if (!(parent(c) = dad)) \
*top = c; \
else if (left(dad) == x) \
left(dad) = c; \
else \
assert(right(dad) == x), right(dad) = c; \
\
left(c) = x; \
parent(x) = c; \
} \
extern int const prefix##_dummy
/* x c
* / \ / \
* Convert c f into a x
* / \ / \
* a d d f
*/
#define RBTREE_RIGHT_ROTATE(prefix, Type, left, right, parent) \
su_inline \
void prefix ## _right_rotate(Type **top, Type *x) \
{ \
Type *c = left(x), *dad = parent(x); assert(c); \
\
if ((left(x) = right(c))) \
parent(left(x)) = x; \
\
if (!(parent(c) = dad)) \
*top = c; \
else if (right(dad) == x) \
right(dad) = c; \
else \
assert(left(dad) == x), left(dad) = c; \
\
right(c) = x; \
parent(x) = c; \
} \
extern int const prefix##_dummy
#define RBTREE_BALANCE_INSERT1(prefix, Type, left, right, parent, IS_RED, SET_RED, IS_BLACK, SET_BLACK) \
su_inline \
void prefix ## _balance_insert(Type **top, Type *node) \
{ \
Type *dad, *uncle, *granddad; \
} \
extern int const prefix##_dummy
/* Balance Red-Black binary tree after inserting node @a n.
*
* The function red_black_balance_insert() balances a red-black tree after
* insertion.
*
* RED(node) - set node as red
*/
#define RBTREE_BALANCE_INSERT(prefix, Type, left, right, parent, IS_RED, SET_RED, IS_BLACK, SET_BLACK) \
su_inline \
void prefix ## _balance_insert(Type **top, Type *node) \
{ \
Type *dad, *uncle, *granddad; \
\
SET_RED(node); \
\
for (dad = parent(node); node != *top && IS_RED(dad); dad = parent(node)) { \
/* Repeat until we are parent or we have a black dad */ \
granddad = parent(dad); assert(granddad); \
if (dad == left(granddad)) { \
uncle = right(granddad); \
if (IS_RED(uncle)) { \
SET_BLACK(dad); SET_BLACK(uncle); SET_RED(granddad); \
node = granddad; \
} else { \
if (node == right(dad)) { \
prefix##_left_rotate(top, node = dad); \
dad = parent(node); assert(dad); \
granddad = parent(dad); assert(granddad); \
} \
SET_BLACK(dad); \
SET_RED(granddad); \
prefix##_right_rotate(top, granddad); \
} \
} else { assert(dad == right(granddad)); \
uncle = left(granddad); \
if (IS_RED(uncle)) { \
SET_BLACK(dad); SET_BLACK(uncle); SET_RED(granddad); \
node = granddad; \
} else { \
if (node == left(dad)) { \
prefix##_right_rotate(top, node = dad); \
dad = parent(node); assert(dad); \
granddad = parent(dad); assert(granddad); \
} \
SET_BLACK(dad); \
SET_RED(granddad); \
prefix##_left_rotate(top, granddad); \
} \
} \
} \
\
assert(*top); \
\
SET_BLACK((*top)); \
} \
extern int const prefix##_dummy
#define RBTREE_BALANCE_DELETE(prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, \
COPY_COLOR) \
su_inline \
void prefix##_balance_delete(Type **top, Type *node) \
{ \
Type *dad, *brother; \
\
for (dad = parent(node); node != *top && IS_RED(dad); dad = parent(node)) { \
if (node == left(dad)) { \
brother = right(dad); \
\
if (!brother) { \
node = dad; \
continue; \
} \
\
assert(IS_BLACK(brother)); \
\
if (IS_BLACK(left(brother)) && IS_BLACK(right(brother))) { \
SET_RED(brother); \
node = dad; \
continue; \
} \
\
if (IS_BLACK(right(brother))) { \
SET_RED(brother); \
SET_BLACK(left(brother)); \
prefix##_right_rotate(top, brother); \
brother = right(dad); \
} \
\
COPY_COLOR(brother, dad); \
SET_BLACK(dad); \
if (right(brother)) \
SET_BLACK(right(brother)); \
prefix##_left_rotate(top, dad); \
node = *top; \
break; \
} else { \
assert(node == right(dad)); \
\
brother = left(dad); \
\
if (!brother) { \
node = dad; \
continue; \
} \
\
assert(IS_BLACK(brother)); \
\
if (IS_BLACK(left(brother)) && IS_BLACK(right(brother))) { \
SET_RED(brother); \
node = dad; \
continue; \
} \
\
if (IS_BLACK(left(brother))) { \
SET_BLACK(right(brother)); \
SET_RED(brother); \
prefix##_left_rotate(top, brother); \
brother = left(dad); \
} \
\
COPY_COLOR(brother, parent(node)); \
SET_BLACK(parent(node)); \
if (left(brother)) \
SET_BLACK(left(brother)); \
prefix##_right_rotate(top, dad); \
node = *top; \
break; \
} \
} \
\
SET_BLACK(node); \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/**Insert a @a node into the @a tree.
*
* @param tree pointer to the root of the tree
* @param node pointer to node to be inserted
* @param return_old return value parameter for matching node
* already in the @a tree
*
* @retval 0 if node was inserted
* @retval -1 if there already was an matching node
* and return_old is NULL.
*/
int rbtree_insert(Type **tree, Type *node, Type **return_old);
#endif
/* Insert node into tree. */
#define RBTREE_INSERT(SCOPE, prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR, \
CMP, REMOVE, INSERT) \
SCOPE \
int prefix ## _insert(Type **const tree, \
Type * const node, \
Type **return_old) \
{ \
Type *old, *dad, **slot; \
\
if (tree == NULL || node == NULL) return -1; \
\
for (slot = tree, old = *slot, dad = NULL; old; old = *slot) { \
int result = CMP(node, old); \
if (result < 0) \
dad = old, slot = &(left(old)); \
else if (result > 0) \
dad = old, slot = &(right(old)); \
else \
break; \
} \
\
if (old == node) \
old = NULL; \
else if (old) { \
if (!return_old) return -1; \
\
if ((left(node) = left(old))) \
parent(left(node)) = node; \
if ((right(node) = right(old))) \
parent(right(node)) = node; \
\
if (!(parent(node) = parent(old))) \
*tree = node; \
else if (left(parent(node)) == old) \
left(parent(node)) = node; \
else assert(right(parent(node)) == old), \
right(parent(node)) = node; \
\
COPY_COLOR(node, old); \
\
REMOVE(old); \
\
} else { \
*slot = node; \
parent(node) = dad; \
\
if (tree != slot) { \
prefix##_balance_insert(tree, node); \
} else { \
SET_BLACK(node); \
} \
} \
\
INSERT(node); \
\
if (return_old) \
*return_old = old; \
\
return 0; \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/** Append @a a node into the @a tree.
*
* @param tree pointer to the root of the tree
* @param node pointer to node to be appended
*
* @retval 0 when successful (always)
*/
int rbtree_append(Type ** tree,
Type * node);
#endif
/* Define function appending a node into the tree */
#define RBTREE_APPEND(SCOPE, prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR, \
CMP, REMOVE, INSERT) \
SCOPE \
int prefix ## _append(Type **const tree, \
Type * const node) \
{ \
Type *old, *dad, **slot; \
\
if (tree == NULL || node == NULL) return -1; \
\
for (slot = tree, old = *slot, dad = NULL; old; old = *slot) { \
if (old == node) \
return 0; \
if (CMP(node, old) < 0) \
dad = old, slot = &(left(old)); \
else \
dad = old, slot = &(right(old)); \
} \
\
*slot = node; \
parent(node) = dad; \
\
if (tree != slot) { \
prefix##_balance_insert(tree, node); \
} else { \
SET_BLACK(node); \
} \
\
INSERT(node); \
\
return 0; \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/** Remove a @a node from the @a tree.
*
* @param tree pointer to the root of the tree
* @param node pointer to node to be appended
*/
void rbtree_remove(Type **tree, Type *node);
#endif
#define RBTREE_REMOVE(SCOPE, prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR, \
REMOVE, INSERT) \
SCOPE \
void prefix##_remove(Type **top, Type *node) \
{ \
Type *kid, *dad; \
int need_to_balance; \
\
if (top == NULL || node == NULL) \
return; \
\
/* Make sure that node is in tree */ \
for (dad = node; dad; dad = parent(dad)) \
if (dad == *top) \
break; \
\
if (!dad) return; \
\
/* Find a successor node with a free branch */ \
if (!left(node) || !right(node)) \
dad = node; \
else for (dad = right(node); left(dad); dad = left(dad)) \
; \
/* Dad has a free branch => kid is dad's only child */ \
kid = left(dad) ? left(dad) : right(dad); \
\
/* Remove dad from tree */ \
if (!(parent(dad))) \
*top = kid; \
else if (left(parent(dad)) == dad) \
left(parent(dad)) = kid; \
else assert(right(parent(dad)) == dad), \
right(parent(dad)) = kid; \
if (kid) \
parent(kid) = parent(dad); \
\
need_to_balance = kid && IS_BLACK(dad); \
\
/* Put dad in place of node */ \
if (node != dad) { \
if (!(parent(dad) = parent(node))) \
*top = dad; \
else if (left(parent(dad)) == node) \
left(parent(dad)) = dad; \
else assert(right(parent(dad)) == node), \
right(parent(dad)) = dad; \
\
COPY_COLOR(dad, node); \
\
if ((left(dad) = left(node))) \
parent(left(dad)) = dad; \
\
if ((right(dad) = right(node))) \
parent(right(dad)) = dad; \
} \
\
REMOVE(node); \
SET_RED(node); \
\
if (need_to_balance) \
prefix##_balance_delete(top, kid); \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/** Return inorder successor of node @a node.
*
* @param node pointer to node
*
* @return Pointer to successor, or NULL if @a node was last.
*/
Type *rbtree_succ(Type const *node);
#endif
/* Define function returning inorder successor of node @a node. */
#define RBTREE_SUCC(SCOPE, prefix, Type, left, right, parent) \
SCOPE Type *prefix##_succ(Type const *node) \
{ \
Type const *dad; \
\
if (right(node)) { \
for (node = right(node); left(node); node = left(node)) \
; \
return (Type *)node; \
} \
\
for (dad = parent(node); dad && node == right(dad); dad = parent(node)) \
node = dad; \
\
return (Type *)dad; \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/** Return inorder precedessor of node @a node.
*
* @param node pointer to node
*
* @return Pointer to precedessor, or NULL if @a node was first.
*/
Type *rbtree_prec(Type const *node);
#endif
/* Define function returning inorder precedessor of node @a node. */
#define RBTREE_PREC(SCOPE, prefix, Type, left, right, parent) \
SCOPE Type *prefix##_prec(Type const *node) \
{ \
Type const *dad; \
\
if (left(node)) { \
for (node = left(node); right(node); node = right(node)) \
; \
return (Type *)node; \
} \
\
for (dad = parent(node); dad && node == left(dad); dad = parent(node)) \
node = dad; \
\
return (Type *)dad; \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/** Return first node in the tree to which @a node belongs to.
*
* @param node pointer to node
*
* @return Pointer to first node.
*/
Type *rbtree_first(Type const *node);
#endif
/* Define function returning first node in tree @a node. */
#define RBTREE_FIRST(SCOPE, prefix, Type, left, right, parent) \
SCOPE Type *prefix##_first(Type const *node) \
{ \
while (node && left(node)) \
node = left(node); \
\
return (Type *)node; \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/** Return last node in the tree to which @a node belongs to.
*
* @param node pointer to node
*
* @return Pointer to last node.
*/
Type *rbtree_last(Type const *node);
#endif
/* Define function returning last node in tree @a node. */
#define RBTREE_LAST(SCOPE, prefix, Type, left, right, parent) \
SCOPE Type *prefix##_last(Type const *node) \
{ \
while (node && right(node)) \
node = right(node); \
\
return (Type *)node; \
} \
extern int const prefix##_dummy
#if DOCUMENTATION_ONLY
/** Return height of the tree below @a node.
*
* @param node pointer to node
*
* @return Height of the tree.
*/
int rbtree_height(Type const *node);
#endif
/* Define function returning height of the tree from the @a node. */
#define RBTREE_HEIGHT(SCOPE, prefix, Type, getleft, getright, getparent) \
SCOPE int prefix##_height(Type const *node) \
{ \
int left, right; \
\
if (!node) \
return 0; \
\
left = getleft(node) ? prefix##_height(getleft(node)) : 0; \
right = getright(node) ? prefix##_height(getright(node)) : 0; \
\
if (left > right) \
return left + 1; \
else \
return right + 1; \
} \
extern int const prefix##_dummy
/** Define prototypes for red-black tree functions. @HIDE
*
* @param SCOPE function scope (e.g., su_inline)
* @param prefix function prefix (e.g., rbtree)
* @param Type node type
*
* @par Example
* @code
* RBTREE_PROTOS(su_inline, rbtree, struct node);
* @endcode
*/
#define RBTREE_PROTOS(SCOPE, prefix, Type) \
SCOPE int prefix ## _insert(Type **, Type *, Type **return_old); \
SCOPE int prefix ## _append(Type **, Type *); \
SCOPE void prefix ## _remove(Type **, Type *); \
SCOPE Type *prefix ## _succ(Type const *); \
SCOPE Type *prefix ## _prec(Type const *); \
SCOPE Type *prefix ## _first(Type const *); \
SCOPE Type *prefix ## _last(Type const *); \
SCOPE int prefix ## _height(Type const *)
/** Define bodies for red-black tree functions. @HIDE
*
* @param SCOPE function scope (e.g., su_inline)
* @param prefix function prefix (e.g., rbtree)
* @param Type node type
* @param left accessor of left node
* @param right accessor of right node
* @param parent accessor of parent node
* @param IS_RED predicate testing if node is red
* @param SET_RED setter marking node as red
* @param IS_BLACK predicate testing if node is black
* @param SET_BLACK setter marking node as black
* @param COPY_COLOR method copying color from node to another
* @param CMP method comparing two nodes
* @param INSERT setter marking node as inserted to the tree
* @param REMOVE method marking node as removed and possibly deleting node
*
* @par Example
*
* @code
* #define LEFT(node) ((node)->left)
* #define RIGHT(node) ((node)->right)
* #define PARENT(node) ((node)->parent)
* #define SET_RED(node) ((node)->black = 0)
* #define SET_BLACK(node) ((node)->black = 1)
* #define CMP(a, b) ((a)->value - (b)->value)
* #define IS_RED(node) ((node) && (node)->black == 0)
* #define IS_BLACK(node) (!(node) || (node)->black == 1)
* #define COPY_COLOR(dst, src) ((dst)->black = (src)->black)
* #define INSERT(node) ((node)->inserted = 1)
* #define REMOVE(node) ((node)->left = (node)->right = (node)->parent = NULL, \
* (node)->inserted = 0)
*
* RBTREE_BODIES(su_inline, rbtree, struct node,
* LEFT, RIGHT, PARENT,
* IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR,
* CMP, INSERT, REMOVE);
* @endcode
*/
#define RBTREE_BODIES(SCOPE, prefix, Type, \
left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR, \
CMP, INSERT, REMOVE) \
RBTREE_LEFT_ROTATE(prefix, Type, left, right, parent); \
RBTREE_RIGHT_ROTATE(prefix, Type, left, right, parent); \
RBTREE_BALANCE_INSERT(prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK); \
RBTREE_BALANCE_DELETE(prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, \
COPY_COLOR); \
RBTREE_INSERT(SCOPE, prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR, \
CMP, REMOVE, INSERT); \
RBTREE_APPEND(SCOPE, prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR, \
CMP, REMOVE, INSERT); \
RBTREE_REMOVE(SCOPE, prefix, Type, left, right, parent, \
IS_RED, SET_RED, IS_BLACK, SET_BLACK, COPY_COLOR, \
REMOVE, INSERT); \
RBTREE_SUCC(SCOPE, prefix, Type, left, right, parent); \
RBTREE_PREC(SCOPE, prefix, Type, left, right, parent); \
RBTREE_FIRST(SCOPE, prefix, Type, left, right, parent); \
RBTREE_LAST(SCOPE, prefix, Type, left, right, parent); \
RBTREE_HEIGHT(SCOPE, prefix, Type, left, right, parent)
#endif /* !define(RBTREE_H) */
|