dklabel
if (dklabel.d_magic == DISKMAGIC && (secsz = dklabel.d_secsize) != 0) {
partoff = dklabel.d_partitions[part].p_offset;
partsz = dklabel.d_partitions[part].p_size;
if (part >= (int) dklabel.d_npartitions || partsz == 0) {