Function gmp_mpfr_sys::gmp::__gmpf_get_str

pub unsafe extern fn __gmpf_get_str(arg1: *mut c_char,
                                    arg2: *mut mp_exp_t,
                                    arg3: c_int,
                                    arg4: size_t,
                                    arg5: mpf_srcptr)
                                    -> *mut c_char