printf 'abcdefghij' > c1; printf 'abcdeXghiY' > c2

$ cat c1 | ./target/release/diffutils cmp -l - c2
                   6 146 130
                  10 152 131
# Exit code: 1

$ cat c1 | LC_ALL=C cmp -l - c2
 6 146 130
10 152 131
# Exit code: 1

let mut offset_width = params.max_bytes.unwrap_or(BytesLimitU64::MAX);

if let (Ok(a_meta), Ok(b_meta)) = (fs::metadata(&params.from), fs::metadata(&params.to)) {

#[test]
fn cmp_verbose_offset_width_stdin() -> Result<(), Box<dyn std::error::Error>> {
    let tmp_dir = tempdir()?;
    let b_path = tmp_dir.path().join("b");
    std::fs::write(&b_path, b"abcdeXghiY")?;
    let mut cmd = cargo_bin_cmd!("diffutils");
    cmd.arg("cmp").arg("-l").arg("-").arg(&b_path);
    cmd.write_stdin("abcdefghij");
    cmd.assert()
        .code(predicate::eq(1))
        .stdout(predicate::eq(" 6 146 130\n10 152 131\n"));
    Ok(())
}