private fun u8char_tos(r: CString, len: Int) `{
		r[len] = '\0';
		switch(len){
			case 1:
				r[0] = self;
				break;
			case 2:
				r[0] = 0xC0 | ((self & 0x7C0) >> 6);
				r[1] = 0x80 | (self & 0x3F);
				break;
			case 3:
				r[0] = 0xE0 | ((self & 0xF000) >> 12);
				r[1] = 0x80 | ((self & 0xFC0) >> 6);
				r[2] = 0x80 | (self & 0x3F);
				break;
			case 4:
				r[0] = 0xF0 | ((self & 0x1C0000) >> 18);
				r[1] = 0x80 | ((self & 0x3F000) >> 12);
				r[2] = 0x80 | ((self & 0xFC0) >> 6);
				r[3] = 0x80 | (self & 0x3F);
				break;
		}
	`}