}
}
-sl_iter_t *sl_iter_start (skiplist_t *sl, void *key) {
- node_t *item;
- find_preds(NULL, &item, 0, sl, key, FALSE);
- return item;
+sl_iter_t *sl_iter_begin (skiplist_t *sl, void *key) {
+ node_t *iter = node_alloc(0, 0, 0);
+ find_preds(NULL, &iter->next[0], 0, sl, key, FALSE);
+ return iter;
}
-sl_iter_t *sl_iter_next (sl_iter_t *iter) {
+uint64_t sl_iter_next (sl_iter_t *iter, void **key_ptr) {
assert(iter);
- if (EXPECT_FALSE(!iter))
- return NULL;
-
- node_t *next = iter->next[0];
- while (next != NULL && IS_TAGGED(next->next[0], TAG1)) {
- next = (node_t *)STRIP_TAG(next->next[0], TAG1);
+ node_t *item = iter->next[0];
+ while (item != NULL && IS_TAGGED(item->next[0], TAG1)) {
+ item = (node_t *)STRIP_TAG(item->next[0], TAG1);
}
-
- return next;
-}
-
-uint64_t sl_iter_val (sl_iter_t *iter) {
- return iter->val;
+ if (item == NULL) {
+ iter->next[0] = NULL;
+ return DOES_NOT_EXIST;
+ }
+ iter->next[0] = item->next[0];
+ if (key_ptr != NULL) {
+ *key_ptr = item->key;
+ }
+ return item->val;
}
-void *sl_iter_key (sl_iter_t *iter) {
- return iter->key;
+void sl_iter_free (sl_iter_t *iter) {
+ nbd_free(iter);
}