4.9.3.1 Starting at the Null Node

The trav_t_init() function just initializes a traverser to the null item, indicated by a null pointer for bst_node.

64. <BST traverser null initializer 64> =
void 
bst_t_init (struct bst_traverser *trav, struct bst_table *tree) 
{
  trav->bst_table = tree;
  trav->bst_node = NULL;
  trav->bst_height = 0;
  trav->bst_generation = tree->bst_generation;
}

This code is included in 63 and 178.