mirror of
https://github.com/radareorg/radare2.git
synced 2024-12-11 23:16:05 +00:00
385 lines
7.8 KiB
C
385 lines
7.8 KiB
C
/* radare - BSD 3 Clause License - Copyright 2017 - MaskRay */
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#include <stdio.h>
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#include "r_util/r_rbtree.h"
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static inline bool red(RBNode *x) {
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return x && x->red;
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}
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static inline RBNode *zag(RBNode *x, int dir, RBNodeSum sum) {
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RBNode *y = x->child[dir];
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x->child[dir] = y->child[!dir];
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y->child[!dir] = x;
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x->red = true;
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y->red = false;
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if (sum) {
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sum (x);
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}
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return y;
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}
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static inline RBNode *zig_zag(RBNode *x, int dir, RBNodeSum sum) {
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RBNode *y = x->child[dir], *z = y->child[!dir];
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y->child[!dir] = z->child[dir];
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z->child[dir] = y;
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x->child[dir] = z->child[!dir];
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z->child[!dir] = x;
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x->red = y->red = true;
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z->red = false;
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if (sum) {
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sum (x);
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sum (y);
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}
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return z;
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}
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static inline RBIter bound_iter(RBNode *x, void *data, RBComparator cmp, bool upper, bool backward) {
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RBIter it;
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it.len = 0;
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while (x) {
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int d = cmp (data, x);
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if (upper ? d < 0 : d <= 0) {
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if (!backward) {
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it.path[it.len++] = x;
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}
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x = x->child[0];
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} else {
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if (backward) {
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it.path[it.len++] = x;
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}
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x = x->child[1];
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}
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}
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return it;
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}
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/*
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static void _check1(RBNode *x, int dep, int black, bool leftmost) {
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static int black_;
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if (x) {
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black += !x->red;
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if (x->red && ((x->child[0] && x->child[0]->red) || (x->child[1] && x->child[1]->red))) {
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printf ("error: red violation\n");
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}
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_check1 (x->child[0], dep + 1, black, leftmost);
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_check1 (x->child[1], dep + 1, black, false);
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} else if (leftmost) {
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black_ = black;
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} else if (black_ != black) {
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printf ("error: different black height\n");
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}
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}
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static void _check(RBNode *x) {
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_check1 (x, 0, 0, true);
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}
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*/
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// Returns true if a node with an equal key is deleted
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R_API bool r_rbtree_aug_delete(RBNode **root, void *data, RBComparator cmp, RBNodeFree freefn, RBNodeSum sum) {
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RBNode head, *del = NULL, **del_link = NULL, *g = NULL, *p = NULL, *q = &head, *path[R_RBTREE_MAX_HEIGHT];
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int d = 1, d2, dep = 0;
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head.child[0] = NULL;
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head.child[1] = *root;
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while (q->child[d]) {
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d2 = d;
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g = p;
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p = q;
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if (del_link) {
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d = 1;
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} else {
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d = cmp (data, q->child[d2]);
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if (d < 0) {
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d = 0;
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} else if (d > 0) {
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d = 1;
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} else {
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del_link = &q->child[d2];
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}
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}
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if (q != &head) {
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if (dep >= R_RBTREE_MAX_HEIGHT) {
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eprintf ("Too deep tree\n");
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break;
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}
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path[dep++] = q;
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}
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q = q->child[d2];
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if (q->red || red (q->child[d])) {
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continue;
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}
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if (red (q->child[!d])) {
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if (del_link && *del_link == q) {
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del_link = &q->child[!d]->child[d];
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}
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p->child[d2] = zag (q, !d, sum);
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p = p->child[d2];
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if (dep >= R_RBTREE_MAX_HEIGHT) {
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eprintf ("Too deep tree\n");
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break;
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}
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path[dep++] = p;
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} else {
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RBNode *s = p->child[!d2];
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if (! s) {
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continue;
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}
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if (! red (s->child[0]) && ! red (s->child[1])) {
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p->red = false;
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q->red = s->red = true;
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} else {
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int d3 = g->child[0] != p;
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RBNode *t;
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if (red (s->child[d2])) {
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if (del_link && *del_link == p) {
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del_link = &s->child[d2]->child[d2];
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}
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t = zig_zag (p, !d2, sum);
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} else {
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if (del_link && *del_link == p) {
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del_link = &s->child[d2];
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}
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t = zag (p, !d2, sum);
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}
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t->red = q->red = true;
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t->child[0]->red = t->child[1]->red = false;
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g->child[d3] = t;
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path[dep - 1] = t;
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path[dep++] = p;
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}
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}
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}
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if (del_link) {
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del = *del_link;
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p->child[q != p->child[0]] = q->child[q->child[0] == NULL];
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if (del != q) {
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*q = *del;
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*del_link = q;
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}
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if (freefn) {
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freefn (del);
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}
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}
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if (sum) {
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while (dep--) {
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sum (path[dep] == del ? q : path[dep]);
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}
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}
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if ((*root = head.child[1])) {
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(*root)->red = false;
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}
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return del;
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}
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// Returns 1 if `data` is inserted; 0 if an equal key already exists; -1 if allocation fails.
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R_API void r_rbtree_aug_insert(RBNode **root, void *data, RBNode *node, RBComparator cmp, RBNodeSum sum) {
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node->child[0] = node->child[1] = NULL;
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if (!*root) {
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*root = node;
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node->red = false;
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if (sum) {
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sum (node);
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}
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return;
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}
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RBNode *t = NULL, *g = NULL, *p = NULL, *q = *root;
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int d, dep = 0;
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bool done = false;
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RBNode *path[R_RBTREE_MAX_HEIGHT];
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for (;;) {
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if (!q) {
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q = node;
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q->red = true;
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p->child[d] = q;
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done = true;
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} else if (red (q->child[0]) && red (q->child[1])) {
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q->child[0]->red = q->child[1]->red = false;
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if (q != *root) {
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q->red = true;
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}
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}
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if (q->red && p && p->red) {
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int d3 = t ? t->child[0] != g : -1, d2 = g->child[0] != p;
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if (p->child[d2] == q) {
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g = zag (g, d2, sum);
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dep--;
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path[dep - 1] = g;
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} else {
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g = zig_zag (g, d2, sum);
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dep -= 2;
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}
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if (t) {
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t->child[d3] = g;
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} else {
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*root = g;
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}
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}
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if (done) {
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break;
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}
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d = cmp (data, q);
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t = g;
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g = p;
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p = q;
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if (dep >= R_RBTREE_MAX_HEIGHT) {
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eprintf ("Too deep tree\n");
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break;
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}
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path[dep++] = q;
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if (d < 0) {
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d = 0;
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q = q->child[0];
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} else {
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d = 1;
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q = q->child[1];
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}
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}
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if (sum) {
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sum (q);
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while (dep) {
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sum (path[--dep]);
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}
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}
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}
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// returns true if the sum has been updated, false if node has not been found
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R_API bool r_rbtree_aug_update_sum(RBNode *root, void *data, RBNode *node, RBComparator cmp, RBNodeSum sum) {
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int dep = 0;
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RBNode *path[R_RBTREE_MAX_HEIGHT];
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RBNode *cur = root;
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for (;;) {
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if (dep >= R_RBTREE_MAX_HEIGHT) {
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eprintf ("Too deep tree\n");
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return false;
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}
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if (!cur) {
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return false;
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}
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path[dep] = cur;
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dep++;
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if (cur == node) {
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break;
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}
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int d = cmp (data, cur);
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if (d < 0) {
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cur = cur->child[0];
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} else {
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cur = cur->child[1];
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}
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}
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for(; dep > 0; dep--) {
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sum (path[dep-1]);
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}
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return true;
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}
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R_API bool r_rbtree_delete(RBNode **root, void *data, RBComparator cmp, RBNodeFree freefn) {
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return r_rbtree_aug_delete (root, data, cmp, freefn, NULL);
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}
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R_API RBNode *r_rbtree_find(RBNode *x, void *data, RBComparator cmp) {
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while (x) {
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int d = cmp (data, x);
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if (d < 0) {
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x = x->child[0];
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} else if (d > 0) {
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x = x->child[1];
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} else {
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return x;
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}
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}
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return NULL;
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}
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R_API void r_rbtree_free(RBNode *x, RBNodeFree freefn) {
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if (x) {
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r_rbtree_free (x->child[0], freefn);
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r_rbtree_free (x->child[1], freefn);
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freefn (x);
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}
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}
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R_API void r_rbtree_insert(RBNode **root, void *data, RBNode *node, RBComparator cmp) {
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r_rbtree_aug_insert (root, data, node, cmp, NULL);
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}
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R_API RBNode *r_rbtree_lower_bound(RBNode *x, void *data, RBComparator cmp) {
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RBNode *ret = NULL;
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while (x) {
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int d = cmp (data, x);
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if (d <= 0) {
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ret = x;
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x = x->child[0];
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} else {
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x = x->child[1];
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}
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}
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return ret;
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}
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R_API RBIter r_rbtree_lower_bound_backward(RBNode *root, void *data, RBComparator cmp) {
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return bound_iter (root, data, cmp, false, true);
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}
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R_API RBIter r_rbtree_lower_bound_forward(RBNode *root, void *data, RBComparator cmp) {
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return bound_iter (root, data, cmp, false, false);
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}
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R_API RBNode *r_rbtree_upper_bound(RBNode *x, void *data, RBComparator cmp) {
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void *ret = NULL;
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while (x) {
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int d = cmp (data, x);
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if (d < 0) {
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ret = x;
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x = x->child[0];
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} else {
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x = x->child[1];
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}
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}
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return ret;
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}
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R_API RBIter r_rbtree_upper_bound_backward(RBNode *root, void *data, RBComparator cmp) {
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return bound_iter (root, data, cmp, true, true);
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}
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R_API RBIter r_rbtree_upper_bound_forward(RBNode *root, void *data, RBComparator cmp) {
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return bound_iter (root, data, cmp, true, false);
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}
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static RBIter _first(RBNode *x, int dir) {
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RBIter it;
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it.len = 0;
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for (; x; x = x->child[dir]) {
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it.path[it.len++] = x;
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}
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return it;
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}
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R_API RBIter r_rbtree_first(RBNode *tree) {
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return _first (tree, 0);
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}
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R_API RBIter r_rbtree_last(RBNode *tree) {
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return _first (tree, 1);
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}
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static inline void _next(RBIter *it, int dir) {
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RBNode *x = it->path[--it->len];
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for (x = x->child[!dir]; x; x = x->child[dir]) {
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it->path[it->len++] = x;
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}
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}
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R_API void r_rbtree_iter_next(RBIter *it) {
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_next (it, 0);
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}
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R_API void r_rbtree_iter_prev(RBIter *it) {
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_next (it, 1);
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}
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