Function antic::mpfr_get_str

pub unsafe extern "C" fn mpfr_get_str(
    arg1: *mut c_char, 
    arg2: *mut mpfr_exp_t, 
    arg3: c_int, 
    arg4: usize, 
    arg5: mpfr_srcptr, 
    arg6: mpfr_rnd_t
) -> *mut c_char