Function acb_graph_get_unit_language 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn acb_graph_get_unit_language(
    graph: *mut c_void,
    unit_id: u64,
) -> i32

Get a unit’s language. Returns language as u8, or -1 if not found.

Safety

graph must be a valid, non-null handle from acb_graph_open.