vs_sm_scroll
int vs_sm_scroll(SCR *, MARK *, recno_t, scroll_t);
if (vs_sm_scroll(sp, &vp->m_stop, sp->defscroll, CNTRL_U))
if (vs_sm_scroll(sp, &vp->m_stop, sp->defscroll, CNTRL_D))
if (vs_sm_scroll(sp, &vp->m_stop, offset, CNTRL_F))
if (vs_sm_scroll(sp, &vp->m_stop, offset, CNTRL_B))
if (vs_sm_scroll(sp,
if (vs_sm_scroll(sp,
if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))