pp_setreflen
pp_setreflen(amap->am_ppref, 0, amap->am_ref, amap->am_nslot);
pp_setreflen(ppref, lcv, ref, curslot - lcv);
pp_setreflen(ppref, curslot, ref, len - (curslot -lcv));
pp_setreflen(ppref, lcv, ref, stopslot - lcv);
pp_setreflen(ppref, stopslot, ref,
pp_setreflen(ppref, prevlcv, ref, prevlen + len);
pp_setreflen(ppref, lcv, ref, len);