getbsize
header = getbsize(&headerlen, &blocksize);
getbsize(&dummy, &blocksize);
(void)getbsize(¬used, &blocksize);
char *getbsize(int *, long *);
getbsize(&hlen, &blocksize);
(void)getbsize(¬used, &blocksize);
header = getbsize(&hlen, &blocksize);
getbsize(&hlen, &blocksize);
getbsize(&hlen, &blocksize);
header = getbsize(&headerlen, &blocksize);