ulmax
count = ulmax(count, rle->count);
end = ulmax(rle->end, start + count - 1);
rstart = ulmax(s->r_start, start);
rend = ulmin(s->r_end, ulmax(start + count - 1, end));
rstart = ulmax(s->r_start, start);
rend = ulmin(s->r_end, ulmax(start + count, end));
newsize = ulmax(hiwat - asbinc, tp->t_maxseg * 2);