text edit: new line processing mechanism [not finished]

src/utils/d_array.c

@@ -13,6 +13,12 @@ void u_d_arr_ptr_init(d_array_ptr_t *arr, int32_t init_capacity) {
   memset(arr->arr, 0, sizeof(void *) * init_capacity);
 }
 
+/* TODO: check out the correctness */
+void u_d_array_append(d_array_ptr_t *arr, void *el_ptr, size_t el_len) {
+  void *el = malloc(el_len);
+  u_d_arr_ptr_add(arr, el, arr->length);
+}
+
 void u_d_arr_ptr_add(d_array_ptr_t *arr, void *ptr, int32_t idx) {
   if (idx > arr->capacity - 1) {
     int32_t new_capacity = idx * 2;
@@ -31,4 +37,16 @@ void u_d_arr_ptr_free(d_array_ptr_t *arr) {
   arr->length = 0;
   free(arr->arr);
   arr->arr = NULL;
+}
+
+void u_d_arr_free_cb(d_array_ptr_t *arr, u_d_arr_free_callback *callback) {
+  for (int i = 0; i < arr->length; i++) {
+    if (arr->arr[i] != NULL) {
+      callback(arr->arr[i]);
+    }
+  }
+  arr->capacity = 0;
+  arr->length = 0;
+  free(arr->arr);
+  arr->arr = NULL;
 }