OFFSET_SIZE
bcopy(tdatap, (caddr_t)&sp->offset, OFFSET_SIZE);
tdatap += OFFSET_SIZE;
bcopy(tdatap, (caddr_t)&sp->offset, OFFSET_SIZE);
tdatap += OFFSET_SIZE;
bcopy((caddr_t)&segp->offset, tdatap, OFFSET_SIZE);
tdatap += OFFSET_SIZE;
#define SECTION_SIZE (SECTION_HDL_SIZE + OFFSET_SIZE +\
DESCRIPTOR_SIZE + OFFSET_SIZE + LENGTH_SIZE)