int genprintf(void (*put)(void * ctx, char c), void * ctx, char const * fmt, va_list ArgList)
{
    int len = 0;
    bool isNull = false;
    if (put == NULL)
        isNull = true;
    while (*fmt)
    {
        len++;
        if (*fmt == '%')
        {
            fmt++;
            if (*fmt == 'i')
            {
                fmt++;
                char Buff[64] = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
                int length = NumToString(Buff, sizeof(Buff), va_arg(ArgList, int), 10);
                len += length - 1;
                for (int i = 0; i < length; i++) {
                    if (!isNull)
                        put(ctx, Buff[i]);
                }
            }
            else if (*fmt == 'h')
            {
                fmt++;
                char Buff[64] = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
                int length = NumToString(Buff, sizeof(Buff), va_arg(ArgList, int), 16);
                len += length - 1;
                if (!isNull)
                {
                    put(ctx, '0');
                    put(ctx, 'x');
                    for (int i = 0; i < length; i++) {
                        put(ctx, Buff[i]);
                    }
                }

            }
        }
        else
        {
            if (!isNull)
                put(ctx, *fmt);
            fmt++;
        }
    }
    return len;
}

void kprintf(void (*put)(void * ctx, char c), void * ctx, char const * fmt, ...)
{
    va_list vaList;
    va_start(vaList, fmt);
    genprintf(put, ctx, fmt, vaList);
    va_end(vaList);
}