EARLY_SCCB_SIZE
if (sizeof(*sccb) + len >= EARLY_SCCB_SIZE)
len = EARLY_SCCB_SIZE - sizeof(*sccb);
memset(sclp_early_sccb, 0, EARLY_SCCB_SIZE);
sccb->header.length = EARLY_SCCB_SIZE;
end = (unsigned char *) sccb + EARLY_SCCB_SIZE - 1;