gistfile1.txt

    static
    int
    utf8_encode(
        char* dest,
        unsigned long cp)
        
    {
        if(cp < 0x80)
        {
            dest[0] = static_cast<char>(cp);
            return 1;
        }

        if(cp < 0x800)
        {
            dest[0] = static_cast<char>((cp >> 6)            | 0xc0);
            dest[1] = static_cast<char>((cp & 0x3f)          | 0x80);
            return 2;
        }
        if(cp < 0x10000)
        {
            dest[0] = static_cast<char>((cp >> 12)           | 0xe0);
            dest[1] = static_cast<char>(((cp >> 6) & 0x3f)   | 0x80);
            dest[2] = static_cast<char>((cp & 0x3f)          | 0x80);
            return 3;
        }
        {
            dest[0] = static_cast<char>((cp >> 18)           | 0xf0);
            dest[1] = static_cast<char>(((cp >> 12) & 0x3f)  | 0x80);
            dest[2] = static_cast<char>(((cp >> 6) & 0x3f)   | 0x80);
            dest[3] = static_cast<char>((cp & 0x3f)          | 0x80);
            return 4;
        }
    }