Function ncplane_at_cursor_cell 

pub unsafe extern "C" fn ncplane_at_cursor_cell(
    n: *mut ncplane,
    c: *mut nccell,
) -> c_int

Retrieve the current contents of the cell under the cursor into ‘c’. This cell is invalidated if the associated plane is destroyed. Returns the number of bytes in the EGC, or -1 on error.