if (st->y > st->rows) st->y = st->rows-1;
if (st->x > st->columns) st->x = st->columns-2;
if (st->right > st->columns) st->right = st->columns;
if (st->left > st->columns-20) st->left = st->columns-20;
if (st->left < 0) st->left = 0;
if (st->y > st->rows) st->y = st->rows-1;
if (st->x > st->columns) st->x = st->columns-2;
if (st->right > st->columns) st->right = st->columns;
if (st->left > st->columns-20) st->left = st->columns-20;
if (st->left < 0) st->left = 0;