sf_tfiles
sbp->f_files = sfp->sf_tfiles;
sbp->sf_tfiles = fxdr_hyper(tl); tl += 2;
sfp->sf_tfiles != fxdr_hyper(tl))
sfp->sf_tfiles = fxdr_hyper(tl);
txdr_hyper(tval, &sfp->sf_tfiles);
tquad = fxdr_hyper(&sfp->sf_tfiles);