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-rw-r--r--src/common/libalgo/btree.c346
1 files changed, 168 insertions, 178 deletions
diff --git a/src/common/libalgo/btree.c b/src/common/libalgo/btree.c
index d5b34bb..d1bfd18 100644
--- a/src/common/libalgo/btree.c
+++ b/src/common/libalgo/btree.c
@@ -32,18 +32,17 @@ btree_t* create_btree(key_cmp_fun_t cf, kv_iter_fun_t relf) {
return t;
}
-void delete_btree(btree_t *t) {
- void delete_item_rec(btree_item_t *i,kv_iter_fun_t relf) {
- if (i == 0) return;
-
- delete_item_rec(i->left, relf);
- delete_item_rec(i->right, relf);
+void _btree_delete_item_rec(btree_item_t *i,kv_iter_fun_t relf) {
+ if (i == 0) return;
- if (relf) relf(i->key, i->val);
- free(i);
- }
+ _btree_delete_item_rec(i->left, relf);
+ _btree_delete_item_rec(i->right, relf);
- delete_item_rec(t->root, t->releasef);
+ if (relf) relf(i->key, i->val);
+ free(i);
+}
+void delete_btree(btree_t *t) {
+ _btree_delete_item_rec(t->root, t->releasef);
free(t);
}
@@ -115,20 +114,19 @@ btree_item_t* btree_equilibrate(btree_item_t *i) {
// ADDING AND DELETING //
// =================== //
-bool btree_add(btree_t *t, void* key, void* val) {
- btree_item_t* insert(btree_t *t, btree_item_t *root, btree_item_t *i) {
- if (root == 0) return i;
+btree_item_t* _btree_insert(btree_t *t, btree_item_t *root, btree_item_t *i) {
+ if (root == 0) return i;
- if (t->cf(i->key, root->key) <= 0) {
- root->left = insert(t, root->left, i);
- } else {
- root->right = insert(t, root->right, i);
- }
- btree_recalc_height(root);
-
- return btree_equilibrate(root);
+ if (t->cf(i->key, root->key) <= 0) {
+ root->left = _btree_insert(t, root->left, i);
+ } else {
+ root->right = _btree_insert(t, root->right, i);
}
+ btree_recalc_height(root);
+ return btree_equilibrate(root);
+}
+bool btree_add(btree_t *t, void* key, void* val) {
btree_item_t *x = (btree_item_t*)malloc(sizeof(btree_item_t));
if (x == 0) return false;
@@ -137,181 +135,175 @@ bool btree_add(btree_t *t, void* key, void* val) {
x->left = x->right = 0;
btree_recalc_height(x);
- t->root = insert(t, t->root, x);
+ t->root = _btree_insert(t, t->root, x);
t->nitems++;
return true;
}
-void btree_remove(btree_t *t, const void* key) {
- btree_item_t *extract_smallest(btree_item_t *i, btree_item_t **out_smallest) {
- ASSERT(i != 0);
- if (i->left == 0) {
- *out_smallest = i;
- return i->right;
- } else {
- i->left = extract_smallest(i->left, out_smallest);
- btree_recalc_height(i);
- return btree_equilibrate(i);
- }
+btree_item_t *_btree_extract_smallest(btree_item_t *i, btree_item_t **out_smallest) {
+ ASSERT(i != 0);
+ if (i->left == 0) {
+ *out_smallest = i;
+ return i->right;
+ } else {
+ i->left = _btree_extract_smallest(i->left, out_smallest);
+ btree_recalc_height(i);
+ return btree_equilibrate(i);
}
+}
+btree_item_t *_btree_remove_aux(btree_t *t, btree_item_t *i, const void* key) {
+ if (i == 0) return 0;
- btree_item_t *remove_aux(btree_t *t, btree_item_t *i, const void* key) {
- if (i == 0) return 0;
-
- int c = t->cf(key, i->key);
- if (c < 0) {
- i->left = remove_aux(t, i->left, key);
- return btree_equilibrate(i);
- } else if (c > 0) {
- i->right = remove_aux(t, i->right, key);
- return btree_equilibrate(i);
+ int c = t->cf(key, i->key);
+ if (c < 0) {
+ i->left = _btree_remove_aux(t, i->left, key);
+ return btree_equilibrate(i);
+ } else if (c > 0) {
+ i->right = _btree_remove_aux(t, i->right, key);
+ return btree_equilibrate(i);
+ } else {
+ // remove item i
+
+ btree_item_t *new_i;
+ if (i->right == 0 || i->left == 0) {
+ new_i = (i->right == 0 ? i->left : i->right);
} else {
- // remove item i
+ btree_item_t *new_i_right = _btree_extract_smallest(i->right, &new_i);
- btree_item_t *new_i;
- if (i->right == 0 || i->left == 0) {
- new_i = (i->right == 0 ? i->left : i->right);
- } else {
- btree_item_t *new_i_right = extract_smallest(i->right, &new_i);
+ new_i->left = i->left;
+ new_i->right = new_i_right;
- new_i->left = i->left;
- new_i->right = new_i_right;
-
- btree_recalc_height(new_i);
- new_i = btree_equilibrate(new_i);
- }
+ btree_recalc_height(new_i);
+ new_i = btree_equilibrate(new_i);
+ }
- if (t->releasef) t->releasef(i->key, i->val);
- free(i);
- t->nitems--;
+ if (t->releasef) t->releasef(i->key, i->val);
+ free(i);
+ t->nitems--;
- return remove_aux(t, new_i, key); // loop because several elements may correspond
- }
+ return _btree_remove_aux(t, new_i, key); // loop because several elements may correspond
}
-
- t->root = remove_aux(t, t->root, key);
+}
+void btree_remove(btree_t *t, const void* key) {
+ t->root = _btree_remove_aux(t, t->root, key);
}
-void btree_remove_v(btree_t *t, const void* key, const void* val) {
- btree_item_t *extract_smallest(btree_item_t *i, btree_item_t **out_smallest) {
- ASSERT(i != 0);
- if (i->left == 0) {
- *out_smallest = i;
- return i->right;
- } else {
- i->left = extract_smallest(i->left, out_smallest);
- btree_recalc_height(i);
- return btree_equilibrate(i);
- }
+btree_item_t *_btree_extract_smallest_v(btree_item_t *i, btree_item_t **out_smallest) {
+ ASSERT(i != 0);
+ if (i->left == 0) {
+ *out_smallest = i;
+ return i->right;
+ } else {
+ i->left = _btree_extract_smallest_v(i->left, out_smallest);
+ btree_recalc_height(i);
+ return btree_equilibrate(i);
}
+}
+btree_item_t *_btree_remove_aux_v(btree_t *t, btree_item_t *i, const void* key, const void* val) {
+ if (i == 0) return 0;
- btree_item_t *remove_aux(btree_t *t, btree_item_t *i, const void* key, const void* val) {
- if (i == 0) return 0;
-
- int c = t->cf(key, i->key);
- if (c < 0) {
- i->left = remove_aux(t, i->left, key, val);
- return btree_equilibrate(i);
- } else if (c > 0) {
- i->right = remove_aux(t, i->right, key, val);
- return btree_equilibrate(i);
- } else if (i->val == val) {
- // remove item i
-
- btree_item_t *new_i;
- if (i->right == 0 || i->left == 0) {
- new_i = (i->right == 0 ? i->left : i->right);
- } else {
- btree_item_t *new_i_right = extract_smallest(i->right, &new_i);
-
- new_i->left = i->left;
- new_i->right = new_i_right;
-
- btree_recalc_height(new_i);
- new_i = btree_equilibrate(new_i);
- }
-
- if (t->releasef) t->releasef(i->key, i->val);
- free(i);
- t->nitems--;
-
- return remove_aux(t, new_i, key, val); // loop because several elements may correspond
+ int c = t->cf(key, i->key);
+ if (c < 0) {
+ i->left = _btree_remove_aux_v(t, i->left, key, val);
+ return btree_equilibrate(i);
+ } else if (c > 0) {
+ i->right = _btree_remove_aux_v(t, i->right, key, val);
+ return btree_equilibrate(i);
+ } else if (i->val == val) {
+ // remove item i
+
+ btree_item_t *new_i;
+ if (i->right == 0 || i->left == 0) {
+ new_i = (i->right == 0 ? i->left : i->right);
} else {
- i->left = remove_aux(t, i->left, key, val);
- i->right = remove_aux(t, i->right, key, val);
- btree_recalc_height(i);
- return btree_equilibrate(i);
+ btree_item_t *new_i_right = _btree_extract_smallest_v(i->right, &new_i);
+
+ new_i->left = i->left;
+ new_i->right = new_i_right;
+
+ btree_recalc_height(new_i);
+ new_i = btree_equilibrate(new_i);
}
- }
- t->root = remove_aux(t, t->root, key, val);
+ if (t->releasef) t->releasef(i->key, i->val);
+ free(i);
+ t->nitems--;
+
+ return _btree_remove_aux_v(t, new_i, key, val); // loop because several elements may correspond
+ } else {
+ i->left = _btree_remove_aux_v(t, i->left, key, val);
+ i->right = _btree_remove_aux_v(t, i->right, key, val);
+ btree_recalc_height(i);
+ return btree_equilibrate(i);
+ }
+}
+void btree_remove_v(btree_t *t, const void* key, const void* val) {
+ t->root = _btree_remove_aux_v(t, t->root, key, val);
}
// ======================== //
// LOOKING UP AND ITERATING //
// ======================== //
-void* btree_find(btree_t *t, const void* key) {
- btree_item_t *find_aux(btree_t *t, btree_item_t *i, const void* key) {
- if (i == 0) return 0;
-
- int c = t->cf(key, i->key);
- if (c == 0) {
- return i;
- } else if (c < 0) {
- return find_aux(t, i->left, key);
- } else {
- return find_aux(t, i->right, key);
- }
+btree_item_t *_btree_find_aux(btree_t *t, btree_item_t *i, const void* key) {
+ if (i == 0) return 0;
+
+ int c = t->cf(key, i->key);
+ if (c == 0) {
+ return i;
+ } else if (c < 0) {
+ return _btree_find_aux(t, i->left, key);
+ } else {
+ return _btree_find_aux(t, i->right, key);
}
+}
+void* btree_find(btree_t *t, const void* key) {
- btree_item_t *i = find_aux(t, t->root, key);
+ btree_item_t *i = _btree_find_aux(t, t->root, key);
if (i == 0) return 0;
return i->val;
}
-void* btree_lower(btree_t *t, const void* key, void** actual_key) {
- btree_item_t *find_aux(btree_t *t, btree_item_t *i, const void* key) {
- if (i == 0) return 0;
-
- int c = t->cf(key, i->key);
- if (c == 0) {
- return i;
- } else if (c < 0) {
- return find_aux(t, i->left, key);
- } else {
- btree_item_t *r = find_aux(t, i->right, key);
- if (r == 0) r = i;
- return r;
- }
- }
+btree_item_t *_btree_lower_aux(btree_t *t, btree_item_t *i, const void* key) {
+ if (i == 0) return 0;
- btree_item_t *i = find_aux(t, t->root, key);
+ int c = t->cf(key, i->key);
+ if (c == 0) {
+ return i;
+ } else if (c < 0) {
+ return _btree_lower_aux(t, i->left, key);
+ } else {
+ btree_item_t *r = _btree_lower_aux(t, i->right, key);
+ if (r == 0) r = i;
+ return r;
+ }
+}
+void* btree_lower(btree_t *t, const void* key, void** actual_key) {
+ btree_item_t *i = _btree_lower_aux(t, t->root, key);
if (i == 0) return 0;
if (actual_key != 0) *actual_key = i->key;
return i->val;
}
-void* btree_upper(btree_t *t, const void* key, void** actual_key) {
- btree_item_t *find_aux(btree_t *t, btree_item_t *i, const void* key) {
- if (i == 0) return 0;
-
- int c = t->cf(key, i->key);
- if (c == 0) {
- return i;
- } else if (c < 0) {
- btree_item_t *r = find_aux(t, i->left, key);
- if (r == 0) r = i;
- return r;
- } else {
- return find_aux(t, i->right, key);
- }
- }
+btree_item_t *_btree_upper_aux(btree_t *t, btree_item_t *i, const void* key) {
+ if (i == 0) return 0;
- btree_item_t *i = find_aux(t, t->root, key);
+ int c = t->cf(key, i->key);
+ if (c == 0) {
+ return i;
+ } else if (c < 0) {
+ btree_item_t *r = _btree_upper_aux(t, i->left, key);
+ if (r == 0) r = i;
+ return r;
+ } else {
+ return _btree_upper_aux(t, i->right, key);
+ }
+}
+void* btree_upper(btree_t *t, const void* key, void** actual_key) {
+ btree_item_t *i = _btree_upper_aux(t, t->root, key);
if (i == 0) return 0;
if (actual_key != 0) *actual_key = i->key;
@@ -319,35 +311,33 @@ void* btree_upper(btree_t *t, const void* key, void** actual_key) {
}
+void _btree_iter_aux(btree_item_t *i, kv_iter_fun_t f) {
+ if (i == 0) return;
+
+ _btree_iter_aux(i->left, f);
+ f(i->key, i->val);
+ _btree_iter_aux(i->right, f);
+}
void btree_iter(btree_t *t, kv_iter_fun_t f) {
- void iter_aux(btree_item_t *i, kv_iter_fun_t f) {
- if (i == 0) return;
+ _btree_iter_aux(t->root, f);
+}
+
+void _btree_iter_on_aux(btree_t *t, btree_item_t *i, const void* key, kv_iter_fun_t f) {
+ if (i == 0) return;
- iter_aux(i->left, f);
+ int c = t->cf(key, i->key);
+ if (c == 0) {
+ _btree_iter_on_aux(t, i->left, key, f);
f(i->key, i->val);
- iter_aux(i->right, f);
+ _btree_iter_on_aux(t, i->right, key, f);
+ } else if (c < 0) {
+ _btree_iter_on_aux(t, i->left, key, f);
+ } else {
+ _btree_iter_on_aux(t, i->right, key, f);
}
-
- iter_aux(t->root, f);
}
-
void btree_iter_on(btree_t *t, const void* key, kv_iter_fun_t f) {
- void iter_aux(btree_t *t, btree_item_t *i, const void* key, kv_iter_fun_t f) {
- if (i == 0) return;
-
- int c = t->cf(key, i->key);
- if (c == 0) {
- iter_aux(t, i->left, key, f);
- f(i->key, i->val);
- iter_aux(t, i->right, key, f);
- } else if (c < 0) {
- iter_aux(t, i->left, key, f);
- } else {
- iter_aux(t, i->right, key, f);
- }
- }
-
- iter_aux(t, t->root, key, f);
+ _btree_iter_on_aux(t, t->root, key, f);
}
/* vim: set ts=4 sw=4 tw=0 noet :*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 20:11:17 +0000