SGSIZE
nsegs = howmany(hashp->MAX_BUCKET + 1, hashp->SGSIZE);
"SEGMENT SIZE ", hashp->SGSIZE,
hashp->SGSIZE = DEF_SEGSIZE;
nsegs = (nbuckets - 1) / hashp->SGSIZE + 1;
calloc(hashp->SGSIZE, sizeof(SEGMENT))) == NULL)
segment_ndx = addr & (hashp->SGSIZE - 1);
segment_ndx = bp->addr & (hashp->SGSIZE - 1);