Function gr_generic_vec_dot_ui 

pub unsafe extern "C" fn gr_generic_vec_dot_ui(
    res: gr_ptr,
    initial: gr_srcptr,
    subtract: c_int,
    vec1: gr_srcptr,
    vec2: *const ulong,
    len: slong,
    ctx: *mut gr_ctx_struct,
) -> c_int