vs_screens
size_t vs_screens(SCR *, recno_t, size_t *);
cnt = vs_screens(sp, LNO, &CNO);
cnt = vs_screens(sp, LNO, &CNO);
lcnt = vs_screens(sp, p->lno, NULL);
t->soff = vs_screens(sp, t->lno, NULL);
lcnt += vs_screens(sp, lno, NULL);
lcnt = (vs_screens(sp, lno, NULL) - from_sp->soff) + 1;
lcnt += vs_screens(sp, lno, NULL);
tmp.soff = vs_screens(sp, tmp.lno, NULL);
TMAP->soff = vs_screens(sp, lno, NULL);
cnt_orig = vs_screens(sp, lno, NULL);
cnt_new = vs_screens(sp, lno, NULL);