rotate_bits.c

unsigned char rotate_left(unsigned char b)
{
	unsigned char first = b & 0x80;
	b <<= 1;
	b |= first >> 7;
	return b;
}

unsigned char rotate_right(unsigned char b)
{
	unsigned char last = b & 1;
	b >>= 1;
	b |= last << 7;
	return b;
}