random bit generator in c

gistfile1.txt

struct random_bit_generator {
    uint32_t word;
    uint8_t bits_remaining;
};

static bool next_bit(struct random_bit_generator *rbg) {
    if (rbg->bits_remaining == 0) {
        rbg->word = arc4random();
        rbg->bits_remaining = 32;
    }
    const bool bit = (rbg->word >> (--rbg->bits_remaining)) & 1;
    return bit;
}