dbseek
(void) dbseek(0L); /* goto the first block */
if (dbseek(p->fcnoffset) != -1) {
if (dbseek(p->lineoffset) != -1) {
(void) dbseek((blocknumber - 1) * BUFSIZ);
if (dbseek(p->lineoffset) != -1 &&
long dbseek(long offset);