di_path_next
pnode = di_path_next(fp_node, pnode);
extern di_path_t di_path_next(di_node_t node, di_path_t path);
path = di_path_next(ph_node, DI_PATH_NIL);
path = di_path_next(ph_node, path);
path = di_path_next(child_node, path);
path = di_path_next(child_node, path);
path = di_path_next(child_node, path);
path = di_path_next(child_node, path);