md_diff_impl_t
diff_res = md1->allocp(sizeof (md_diff_impl_t));
bzero(diff_res, sizeof (md_diff_impl_t));
md_diff_impl_t *mddp = (md_diff_impl_t *)mdd;
md_diff_impl_t *mddp = (md_diff_impl_t *)mdd;
md_diff_impl_t *mddp = (md_diff_impl_t *)mdd;
md_diff_impl_t *mddp = (md_diff_impl_t *)mdd;
mddp->freep(mddp, sizeof (md_diff_impl_t));
md_diff_impl_t *diff_res;