7.8.2 Starting at the First Node

270. <TBST traverser first initializer 270> =
void *
tbst_t_first (struct tbst_traverser *trav, struct tbst_table *tree) 
{
  assert (tree != NULL && trav != NULL);

  trav->tbst_table = tree;
  trav->tbst_node = tree->tbst_root;
  if (trav->tbst_node != NULL) 
    {
      while (trav->tbst_node->tbst_tag[0] == TBST_CHILD)
        trav->tbst_node = trav->tbst_node->tbst_link[0];
      return trav->tbst_node->tbst_data;
    }
  else 
    return NULL;
}

This code is included in 268.