Tiny Rust ASCII table printer

ascii_table.rs

fn main() {
    println!("| {:^5} | {:>3} | {:>4} | {:03} |", "Char", "Dec", "Hex", "Oct");
    println!("|-------|-----|------|-----|");
    for c in 0u8..128u8 {
        println!("| {:^5} | {:>3} | {:>#4X} | {:03o} |", get_char_name(c), c, c, c);
    }
}

fn get_char_name(c: u8) -> String {
    assert!(c < 128);
    if (c as char).is_control() || c == 0x20 /* space */ {
        match c {
            0 => "NUL",
            1 => "SOH",
            2 => "STX",
            3 => "ETX",
            4 => "EOT",
            5 => "ENQ",
            6 => "ACK",
            7 => "BEL",
            8 => "BS",
            9 => "TAB",
            10 => "LF",
            11 => "VT",
            12 => "FF",
            13 => "CR",
            14 => "SO",
            15 => "SI",
            16 => "DLE",
            17 => "DC1",
            18 => "DC2",
            19 => "DC3",
            20 => "DC4",
            21 => "NAK",
            22 => "SYN",
            23 => "ETB",
            24 => "CAN",
            25 => "EM",
            26 => "SUB",
            27 => "ESC",
            28 => "FS",
            29 => "GS",
            30 => "RS",
            31 => "US",
            32 => "Space",
            127 => "DEL",
            _ => panic!("Impossible! :)"),
        }.to_owned()
    } else {
        (c as char).to_string()
    }
}