cstack_push
int cstack_push(cstack_t *, void *, int);
if (cstack_push(stk, p_dir_info, 0)) {
} else if (cstack_push(stk, t_dir_info,
return (cstack_push(stp, (void *)sp, sizeof (*sp)));
if (cstack_push(sp, tsp, 0)) {
if (cstack_push(sp, tsp, 0)) {