A really WTF way of generating a random entry out of a list of numbers.

urand.c

int main(int argc, char **argv)
{
    int fd = open("/dev/urandom", 0);

    int ai = 0;
    int idx;

    for (;;)
    {
        char c;
        read(fd, &c, 1);
        if (ai && argv[ai][idx + 1] == c)
        {
            printf("++ %d %d\n", ai, idx);
            idx++;
            if (idx == strlen(argv[ai]))
                break;
        }
        for (int i = 1; i < argc; ++i)
            if (argv[i][0] == c)
            {
                printf("-> %d %d\n", ai, idx);
                ai = i;
                idx = 0;
            }
    }
    puts(argv[ai]);
    return ai;
}