[quirischa]

main(argc, argv)
char *argv[];
{
    struct sockaddr_in from;
    char **av = argv;
    struct sockaddr_in *to = (struct sockaddr_in *) &whereto;
    int on = 1;
    struct protoent *proto;

    argc--, av++;
    while (argc > 0 && *av[0] == '-') {
        while (*++av[0]) switch (*av[0]) {
            case 'd':
                options |= SO_DEBUG;
                break;
            case 'r':
                options |= SO_DONTROUTE;
                break;
            case 'v':
                pingflags |= VERBOSE;
                break;
            case 'q':
                pingflags |= QUIET;
                break;
            case 'f':
                pingflags |= FLOOD;
                break;
        }
        argc--, av++;
    }
    if(argc < 1 || argc > 4) {
        printf(usage);
        exit(1);
    }


Первые строчки листинга программы ping