NRECORDS
if (ifd->ifd_front >= ifd->ifd_records + NRECORDS)
if (ifd->ifd_count < NRECORDS)
t += NRECORDS;
if (t >= ifd->ifd_records + NRECORDS)
malloc((size_t)NRECORDS * sizeof (struct iftrace));
for (t = ifd->ifd_records; t < ifd->ifd_records + NRECORDS; t++) {