Added probe function

hashmap.c

@@ -238,6 +238,19 @@ void *hashmap_get(struct hashmap *map, void *key) {
 	}
 }
 
+// hashmap_probe returns the item in the bucket at position or NULL if an item
+// is not set for that bucket. The position is 'moduloed' by the number of 
+// buckets in the hashmap.
+void *hashmap_probe(struct hashmap *map, uint64_t position) {
+    size_t i = position & map->mask;
+    struct bucket *bucket = bucket_at(map, i);
+    if (!bucket->dib) {
+		return NULL;
+	}
+    return bucket_item(bucket);
+}
+
+
 // hashmap_delete removes an item from the hash map and returns it. If the
 // item is not found then NULL is returned.
 void *hashmap_delete(struct hashmap *map, void *key) {

hashmap.h

@@ -24,6 +24,7 @@ bool hashmap_oom(struct hashmap *map);
 void *hashmap_get(struct hashmap *map, void *item);
 void *hashmap_set(struct hashmap *map, void *item);
 void *hashmap_delete(struct hashmap *map, void *item);
+void *hashmap_probe(struct hashmap *map, uint64_t position);
 bool hashmap_scan(struct hashmap *map,
                   bool (*iter)(const void *item, void *udata), void *udata);
 void hashmap_set_allocator(void *(*malloc)(size_t), void (*free)(void*));