mirror of
https://github.com/radareorg/radare2.git
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194 lines
4.6 KiB
C
194 lines
4.6 KiB
C
/* radare - LGPL - Copyright 2009-2011 pancake<nopcode.org> */
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#include <btree.h>
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R_API void btree_init(struct btree_node **T) {
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*T = NULL;
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}
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R_API struct btree_node *btree_remove(struct btree_node *p, BTREE_DEL(del)) {
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struct btree_node *rp = NULL, *f;
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if (p==NULL) return p;
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if (p->right!=NULL) {
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if (p->left!=NULL) {
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f = p;
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rp = p->right;
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while (rp->left!=NULL) {
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f = rp;
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rp = rp->left;
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}
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if (f!=p) {
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f->left = rp->right;
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rp->right = p->right;
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rp->left = p->left;
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} else rp->left = p->left;
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} else rp = p->right;
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} else rp = p->left;
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if (del) del (p->data);
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free (p);
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return(rp);
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}
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R_API void *btree_search(struct btree_node *root, void *x, BTREE_CMP(cmp), int parent) {
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struct btree_node *p = NULL;
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if (root!=NULL) {
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if (cmp (x, root->data)<0)
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p = btree_search (root->left, x, cmp, parent);
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else if (cmp(x, root->data)>0)
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p = btree_search (root->right, x, cmp, parent);
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else p = root;
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}
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/* node found */
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if (p) {
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if (parent)
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return root;
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return p;
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} return NULL;
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}
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R_API int btree_del(struct btree_node *proot, void *x, BTREE_CMP(cmp), BTREE_DEL(del)) {
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struct btree_node *p = btree_search (proot, x, cmp, 1);
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if (p) {
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p->right = btree_remove (p->left, del);
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return R_TRUE;
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}
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return R_FALSE;
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}
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R_API void *btree_get(struct btree_node *proot, void *x, BTREE_CMP(cmp)) {
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struct btree_node *p = btree_search (proot, x, cmp, 0);
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if (p) {
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p->hits++;
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return p->data;
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}
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return NULL;
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}
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R_API void btree_cleartree(struct btree_node *proot, BTREE_DEL(del)) {
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if (proot!=NULL) {
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btree_cleartree (proot->left, del);
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btree_cleartree (proot->right, del);
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if (del) del (proot->data);
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free (proot);
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}
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}
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R_API void btree_insert(struct btree_node **T, struct btree_node *p, BTREE_CMP(cmp)) {
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int ret = cmp (p->data, (*T)->data);
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if (ret<0) {
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if ((*T)->left) btree_insert (&(*T)->left, p, cmp);
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else (*T)->left = p;
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} else if (ret>0) {
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if ((*T)->right) btree_insert (&(*T)->right, p, cmp);
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else (*T)->right = p;
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}
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}
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R_API void btree_add(struct btree_node **T, void *e, BTREE_CMP(cmp)) {
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struct btree_node *p = (struct btree_node*)
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malloc(sizeof(struct btree_node));
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p->data = e;
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p->hits = 0;
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p->left = p->right = NULL;
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if (*T==NULL) *T = p;
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else btree_insert (T, p, cmp);
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}
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/* unused */
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R_API int btree_empty(struct btree_node **T) {
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return !( (T && (*T) && ((*T)->right || (*T)->left)) );
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}
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R_API struct btree_node *btree_hittest(struct btree_node *root, struct btree_node *hn) {
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struct btree_node *p = root;
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if (root != NULL) {
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struct btree_node *ml = btree_hittest(root->left, root);
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struct btree_node *mr = btree_hittest(root->right, root);
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if (ml && ml->hits > p->hits) p = ml;
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if (mr && mr->hits > p->hits) p = mr;
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}
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return p;
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}
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R_API int btree_optimize(struct btree_node **T, BTREE_CMP(cmp)) {
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struct btree_node *node, *NT = NULL;
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do {
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node = btree_hittest(*T, NULL);
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if (node) {
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btree_add (&NT, node->data, cmp);
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btree_del (*T, node->data, cmp, NULL);
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}
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} while(node);
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*T = NT; /* replace one tree with the other */
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return 0;
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}
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#if MAIN
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struct mydata {
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unsigned long long addr;
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char *str;
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};
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int shownode(char *str, struct mydata *m) {
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if (m == NULL)
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printf ("==> not found\n");
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else printf ("==> %s: %s, %"PFMT64d"\n", str, m->str, m->addr);
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return 0;
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}
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int mycmp(const void *a, const void *b) {
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struct mydata *ma = (struct mydata *)a;
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struct mydata *mb = (struct mydata *)b;
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if (a==NULL || b == NULL)
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return 0;
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return (int)(ma->addr-mb->addr);
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}
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int main() {
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struct btree_node *n, *bt = NULL;
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//btree_init(&bt);
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struct mydata foo = { 10, "hello" };
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struct mydata bar = { 20, "world" };
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printf("EMPTY TREE: %d\n", btree_empty(&bt));
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btree_add(&bt, &foo, mycmp);
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btree_add(&bt, &bar, mycmp);
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printf ("EMPTY TREE: %d\n", btree_empty(&bt));
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printf("==== go search ====\n");
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/* find existent data */
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struct mydata *p = btree_get (bt, &bar, mycmp);
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shownode("result for 20: ", p);
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printf("==== go search ====\n");
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/* find unexistent data */
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struct mydata nop = { 15, NULL };
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p = btree_get(bt, &nop, mycmp);
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shownode("result for 15: ", p);
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printf("==== go get hittest ====\n");
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n = btree_hittest(bt, NULL);
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shownode("hitest is: ", p);
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printf("==== go remove 20 ====\n");
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if (btree_del(bt, &bar, mycmp, NULL))
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printf("node found and removed\n");
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else printf("oops\n");
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printf("==== go search ====\n");
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/* find existent data */
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p = btree_get(bt, &bar, mycmp);
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shownode("result for 20: ", p);
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printf("==== go search ====\n");
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/* find existent data */
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p = btree_get(bt, &foo, mycmp);
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shownode("result for 10: ", p);
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btree_cleartree(bt, NULL);
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return 0;
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}
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#endif
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