Function exchange

lib/getopt.c:221–242

(argv)

   the new indices of the non-options in ARGV after they are moved.  */

static void
exchange(argv)
char **argv;
{
    int nonopts_size = (last_nonopt - first_nonopt) * sizeof(char *);
    char **temp = (char **) calloc(1, nonopts_size);

    /* Interchange the two blocks of data in ARGV.  */

    my_bcopy((char *) &argv[first_nonopt], (char *) temp, nonopts_size);
    my_bcopy((char *) &argv[last_nonopt], (char *) &argv[first_nonopt],
             (optind - last_nonopt) * sizeof(char *));
    my_bcopy((char *) temp,
             (char *) &argv[first_nonopt + optind - last_nonopt],
             nonopts_size);

    /* Update records for the slots the non-options now occupy.  */

    first_nonopt += (optind - last_nonopt);
    last_nonopt = optind;
    free(temp);
}

/* Scan elements of ARGV (whose length is ARGC) for option characters
   given in OPTSTRING.