5-options.c

#include <unistd.h>

int main(int ac, char **av)
{
    int i = 1;
    int t[32] = {0};
    int j;

    if (ac == 1)
    {
        write(1, "options: abcdefghijklmnopqrstuvwxyz\n", 36);
        return 0;
    }
    i = 1;
    while (i < ac)
    {
        j = 1;
        if (av[i][0] == '-')
        {
            while (av[i][j] && av[i][j] >= 'a' && av[i][j] <= 'z')
            {
                if (av[i][j] == 'h')
                {
                    write(1, "options: abcdefghijklmnopqrstuvwxyz\n", 36);
                    return 0;
                }
                t['z' - av[i][j] + 6] = 1;
                j++;
            }
            if (av[i][j])
            {
                write(1, "Invalid Option\n", 15);
                return 0;
            }
            j++;
        }
        i++;
    }
    i = 0;
    while (i < 32)
    {
        t[i] = '0' + t[i];
        write(1, &t[i++], 1);
        if (i == 32)
            write(1, "\n", 1);
        else if (i % 8 == 0)
            write (1, " ", 1);
    }
    return 0;
}