FSS_NPSET_BUF
ASSERT(op == FSS_NPSET_BUF || op == FSS_NPROJ_BUF || op == FSS_ONE_BUF);
case FSS_NPSET_BUF:
projbuf = fss_allocbuf(FSS_NPSET_BUF, FSS_ALLOC_PROJ);
zonebuf = fss_allocbuf(FSS_NPSET_BUF, FSS_ALLOC_ZONE);