NDATA
*pSize = NDATA(pCur->pBt, pCell->h);
assert( amt+offset <= NDATA(pCur->pBt, pCell->h) );
if( NKEY(pBt, pCell->h) + NDATA(pBt, pCell->h) <= MX_LOCAL_PAYLOAD ){
if( NKEY(pBtTo, pCell->h) + NDATA(pBtTo, pCell->h) <= MX_LOCAL_PAYLOAD ){
sz = NKEY(pBt, pCell->h) + NDATA(pBt, pCell->h);
NKEY(pBt, pCell->h), NDATA(pBt, pCell->h),
sz = nKey2 + NDATA(pBt, pCell->h);
int n = NKEY(pBt, pCell->h) + NDATA(pBt, pCell->h);