wchar

/**
0xxxxxxx
110xxxxx 10xxxxxx
1110xxxx 10xxxxxx 10xxxxxx
11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
**/

//1110 110001

int main(int argc, char **argv)
{
        setlocale(LC_ALL, "en_US.UTF-8");

        wchar_t value = L'。';
        //我是一只猫。
        unsigned int mask0 = 0;
        unsigned int mask1 = 49280;
        unsigned int mask2= 14712960;
        unsigned int mask3= 4034953344;

        unsigned int v = value;
        int size = size_bin(value);
        int res = 0;
        printf("size %d\n", size);
        unsigned char octet;

        if (size <= 7)
        {
                octet = value;
                write(1, &octet, 1);
        }
        else  if (size <= 11)
        {
                unsigned char o2 = (v << 26) >> 26; // recuperation des 6 premiers bits 110xxxxx 10(xxxxxx)
                unsigned char o1 = ((v >> 6) << 27) >> 27; // recuperation des 5 derniers bits 110(xxxxx) 10xxxxxx

                octet = (mask1 >> 8) | o1; // application des bits du premier octet sur le premier octet mask
                write(1, &octet, 1);
                octet = ((mask1 << 24) >> 24) | o2; // application des bits du seond octet sur le second octet du mask
                write(1, &octet, 1);
        }
        else  if (size <= 16)
        {
                unsigned char o3 = (v << 26) >> 26; // recuperation des 6 premiers bits 1110xxxx 10xxxxxx 10(xxxxxx)
                unsigned char o2 = ((v >> 6) << 26) >> 26; // recuperation des 6 seconds bits 1110xxxx 10(xxxxxx) 10xxxxxx
                unsigned char o1 = ((v >> 12) << 28) >> 28; // recuperation des 4 derniers bits 1110(xxxx) 10xxxxxx 10xxxxxx

                octet = (mask2 >> 16) | o1; // application des bits du premier octet sur le premier octet mask
                write(1, &octet, 1);
                octet = ((mask2 << 16) >> 24) | o2; // application des bits du seond octet sur le second octet du mask
                write(1, &octet, 1);
                octet = ((mask2 << 24) >> 24) | o3; // application des bits du troisieme octet sur le troisieme octet du mask
                write(1, &octet, 1);
        }
        else
        {
                unsigned char o4 = (v << 26) >> 26; // recuperation des 6 premiers bits 11110xxx 10xxxxxx 10xxxxxx 10(xxxxxx)
                unsigned char o3 = ((v >> 6) << 26) >> 26; // recuperation des 6 seconds bits 11110xxx 10xxxxxx 10(xxxxxx) 10xxxxxx
                unsigned char o2 = ((v >> 12) << 26) >> 26;  // recuperation des 6 seconds bits 11110xxx 10(xxxxxx) 10xxxxxx 10xxxxxx
                unsigned char o1 = ((v >> 18) << 29) >> 29; // recuperation des 3 seconds bits 11110(xxx) 10xxxxxx 10xxxxxx 10xxxxxx

                octet = (mask3 >> 24) | o1; // application des bits du premier octet sur le premier octet mask
                write(1, &octet, 1);
                octet = ((mask3 << 8) >> 24) | o2; // application des bits du seond octet sur le second octet du mask
                write(1, &octet, 1);
                octet = ((mask3 << 16) >> 24) | o3; // application des bits du troisieme octet sur le troisieme octet du mask
                write(1, &octet, 1);
                octet = ((mask3 << 24) >> 24) | o4; // application des bits du quatrieme octet sur le quatrieme octet du mask
                write(1, &octet, 1);
        }
        return (0);
}