SYS_BLOCK
#if SYS_BLOCK > TBLOCK
nblock = SYS_BLOCK / TBLOCK;
#if SYS_BLOCK > TBLOCK
#if SYS_BLOCK > TBLOCK
nxb = (blkcnt_t)(seekval % (off_t)(SYS_BLOCK / TBLOCK));
#if SYS_BLOCK > TBLOCK
#if SYS_BLOCK > TBLOCK
if ((i = recno % (SYS_BLOCK / TBLOCK)) != 0) {