bcd.pat

#pragma once

#include <std/io.pat>

/*!
    Type to decode a BCD (Binary Coded Decimal) number
*/

namespace type {

    /**
        Decodes a BCD value where one byte represents a single digit
        @tparam Digits Number of digits
    */
    struct BCD<auto Digits> {
        u8 bytes[Digits];
    } [[sealed, format_read("type::impl::format_bcd")]];

    namespace impl {

        fn format_bcd(ref auto bcd) {
            str result;

            for (u32 i = 0, i < sizeof(bcd.bytes), i += 1) {
                u8 byte = bcd.bytes[i];
                if (byte >= 10)
                    return "Invalid";

                result += std::format("{}", byte);
            }

            return result;
        };

    }

}