Function hex [src]

Converts an unsigned integer of any multiple of u8 to an array of lowercase hex bytes, little endian.

Prototype

pub fn hex(x: anytype) [@sizeOf(@TypeOf(x)) * 2]u8

Example

 test hex {
    {
        const x = hex(@as(u32, 0xdeadbeef));
        try std.testing.expect(x.len == 8);
        try std.testing.expectEqualStrings("efbeadde", &x);
    }
    {
        const s = "[" ++ hex(@as(u64, 0x12345678_abcdef00)) ++ "]";
        try std.testing.expect(s.len == 18);
        try std.testing.expectEqualStrings("[00efcdab78563412]", s);
    }
}

Source

  pub fn hex(x: anytype) [@sizeOf(@TypeOf(x)) * 2]u8 {
    comptime assert(@typeInfo(@TypeOf(x)).int.signedness == .unsigned);
    var result: [@sizeOf(@TypeOf(x)) * 2]u8 = undefined;
    var i: usize = 0;
    while (i < result.len / 2) : (i += 1) {
        const byte: u8 = @truncate(x >> @intCast(8 * i));
        result[i * 2 + 0] = hex_charset[byte >> 4];
        result[i * 2 + 1] = hex_charset[byte & 15];
    }
    return result;
}  