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/*
* RB-Tree based Map
* This implements a basic Map between integer keys and objects. It uses the
* lookup and insertion helpers, rather than open-coding it.
*/
#undef NDEBUG
#include <assert.h>
#include <c-stdaux.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "c-rbtree.h"
#include "c-rbtree-private.h"
typedef struct {
unsigned long key;
unsigned int marker;
CRBNode rb;
} Node;
#define node_from_rb(_rb) ((Node *)((char *)(_rb) - offsetof(Node, rb)))
static int test_compare(CRBTree *t, void *k, CRBNode *n) {
unsigned long key = (unsigned long)k;
Node *node = node_from_rb(n);
return (key < node->key) ? -1 : (key > node->key) ? 1 : 0;
}
static void shuffle(Node **nodes, size_t n_memb) {
unsigned int i, j;
Node *t;
for (i = 0; i < n_memb; ++i) {
j = rand() % n_memb;
t = nodes[j];
nodes[j] = nodes[i];
nodes[i] = t;
}
}
static void test_map(void) {
CRBNode **slot, *p, *safe_p;
CRBTree t = {};
Node *n, *safe_n, *nodes[2048];
unsigned long i, v;
/* allocate and initialize all nodes */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
nodes[i] = malloc(sizeof(*nodes[i]));
c_assert(nodes[i]);
nodes[i]->key = i;
nodes[i]->marker = 0;
c_rbnode_init(&nodes[i]->rb);
}
/* shuffle nodes */
shuffle(nodes, sizeof(nodes) / sizeof(*nodes));
/* add all nodes, and verify that each node is linked */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
c_assert(!c_rbnode_is_linked(&nodes[i]->rb));
c_assert(!c_rbtree_find_entry(&t, test_compare, (void *)nodes[i]->key, Node, rb));
slot = c_rbtree_find_slot(&t, test_compare, (void *)nodes[i]->key, &p);
c_assert(slot);
c_rbtree_add(&t, p, slot, &nodes[i]->rb);
c_assert(c_rbnode_is_linked(&nodes[i]->rb));
c_assert(nodes[i] == c_rbtree_find_entry(&t, test_compare, (void *)nodes[i]->key, Node, rb));
}
/* verify in-order traversal works */
i = 0;
v = 0;
for (p = c_rbtree_first(&t); p; p = c_rbnode_next(p)) {
++i;
c_assert(!node_from_rb(p)->marker);
node_from_rb(p)->marker = 1;
c_assert(v <= node_from_rb(p)->key);
v = node_from_rb(p)->key;
c_assert(!c_rbnode_next(p) || p == c_rbnode_prev(c_rbnode_next(p)));
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* verify reverse in-order traversal works */
i = 0;
v = -1;
for (p = c_rbtree_last(&t); p; p = c_rbnode_prev(p)) {
++i;
c_assert(node_from_rb(p)->marker);
node_from_rb(p)->marker = 0;
c_assert(v >= node_from_rb(p)->key);
v = node_from_rb(p)->key;
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* verify post-order traversal works */
i = 0;
for (p = c_rbtree_first_postorder(&t); p; p = c_rbnode_next_postorder(p)) {
++i;
c_assert(!node_from_rb(p)->marker);
c_assert(!c_rbnode_parent(p) || !node_from_rb(c_rbnode_parent(p))->marker);
c_assert(!p->left || node_from_rb(p->left)->marker);
c_assert(!p->right || node_from_rb(p->right)->marker);
node_from_rb(p)->marker = 1;
c_assert(!c_rbnode_next_postorder(p) || p == c_rbnode_prev_postorder(c_rbnode_next_postorder(p)));
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* verify pre-order (inverse post-order) traversal works */
i = 0;
for (p = c_rbtree_last_postorder(&t); p; p = c_rbnode_prev_postorder(p)) {
++i;
c_assert(node_from_rb(p)->marker);
c_assert(!c_rbnode_parent(p) || !node_from_rb(c_rbnode_parent(p))->marker);
c_assert(!p->left || node_from_rb(p->left)->marker);
c_assert(!p->right || node_from_rb(p->right)->marker);
node_from_rb(p)->marker = 0;
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* verify in-order traversal works via helper */
i = 0;
v = 0;
c_rbtree_for_each(p, &t) {
++i;
c_assert(!node_from_rb(p)->marker);
node_from_rb(p)->marker = 1;
c_assert(v <= node_from_rb(p)->key);
v = node_from_rb(p)->key;
c_assert(!c_rbnode_next(p) || p == c_rbnode_prev(c_rbnode_next(p)));
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* verify in-order traversal works via entry-helper */
i = 0;
v = 0;
c_rbtree_for_each_entry(n, &t, rb) {
++i;
c_assert(n->marker);
n->marker = 0;
c_assert(v <= n->key);
v = n->key;
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* verify post-order traversal works via helper */
i = 0;
c_rbtree_for_each_postorder(p, &t) {
++i;
c_assert(!node_from_rb(p)->marker);
c_assert(!c_rbnode_parent(p) || !node_from_rb(c_rbnode_parent(p))->marker);
c_assert(!p->left || node_from_rb(p->left)->marker);
c_assert(!p->right || node_from_rb(p->right)->marker);
node_from_rb(p)->marker = 1;
c_assert(!c_rbnode_next_postorder(p) || p == c_rbnode_prev_postorder(c_rbnode_next_postorder(p)));
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* verify post-order traversal works via entry-helper */
i = 0;
c_rbtree_for_each_entry_postorder(n, &t, rb) {
++i;
c_assert(n->marker);
c_assert(!c_rbnode_parent(&n->rb) || node_from_rb(c_rbnode_parent(&n->rb))->marker);
c_assert(!n->rb.left || !node_from_rb(n->rb.left)->marker);
c_assert(!n->rb.right || !node_from_rb(n->rb.right)->marker);
n->marker = 0;
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
/* shuffle nodes again */
shuffle(nodes, sizeof(nodes) / sizeof(*nodes));
/* remove all nodes (in different order) */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
c_assert(c_rbnode_is_linked(&nodes[i]->rb));
c_assert(nodes[i] == c_rbtree_find_entry(&t, test_compare, (void *)nodes[i]->key, Node, rb));
c_rbnode_unlink(&nodes[i]->rb);
c_assert(!c_rbnode_is_linked(&nodes[i]->rb));
c_assert(!c_rbtree_find_entry(&t, test_compare, (void *)nodes[i]->key, Node, rb));
}
c_assert(c_rbtree_is_empty(&t));
/* add all nodes again */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
slot = c_rbtree_find_slot(&t, test_compare, (void *)nodes[i]->key, &p);
c_assert(slot);
c_rbtree_add(&t, p, slot, &nodes[i]->rb);
}
/* remove all nodes via helper */
i = 0;
c_rbtree_for_each_safe(p, safe_p, &t) {
++i;
c_rbnode_unlink(p);
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
c_assert(c_rbtree_is_empty(&t));
/* add all nodes again */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
slot = c_rbtree_find_slot(&t, test_compare, (void *)nodes[i]->key, &p);
c_assert(slot);
c_rbtree_add(&t, p, slot, &nodes[i]->rb);
}
/* remove all nodes via entry-helper */
i = 0;
c_rbtree_for_each_entry_safe(n, safe_n, &t, rb) {
++i;
c_rbnode_unlink(&n->rb);
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
c_assert(c_rbtree_is_empty(&t));
/* add all nodes again */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
slot = c_rbtree_find_slot(&t, test_compare, (void *)nodes[i]->key, &p);
c_assert(slot);
c_rbtree_add(&t, p, slot, &nodes[i]->rb);
}
/* remove all nodes via unlink-helper */
i = 0;
c_rbtree_for_each_safe_postorder_unlink(p, safe_p, &t) {
++i;
c_assert(!c_rbnode_is_linked(p));
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
c_assert(c_rbtree_is_empty(&t));
/* add all nodes again */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
slot = c_rbtree_find_slot(&t, test_compare, (void *)nodes[i]->key, &p);
c_assert(slot);
c_rbtree_add(&t, p, slot, &nodes[i]->rb);
}
/* remove all nodes via entry-unlink-helper */
i = 0;
c_rbtree_for_each_entry_safe_postorder_unlink(n, safe_n, &t, rb) {
++i;
c_assert(!c_rbnode_is_linked(&n->rb));
}
c_assert(i == sizeof(nodes) / sizeof(*nodes));
c_assert(c_rbtree_is_empty(&t));
/* free nodes again */
for (i = 0; i < sizeof(nodes) / sizeof(*nodes); ++i) {
c_assert(!nodes[i]->marker);
free(nodes[i]);
}
c_assert(c_rbtree_is_empty(&t));
}
int main(int argc, char **argv) {
/* we want stable tests, so use fixed seed */
srand(0xdeadbeef);
test_map();
return 0;
}
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