#include <getopt.h>

#include <stdio.h>

#include <string.h>

#include <unistd.h>

int

main (int argc, char **argv)

{

  static const struct option options[] =

    {

      {"required", required_argument, NULL, 'r'},

      {"optional", optional_argument, NULL, 'o'},

      {"none",     no_argument,       NULL, 'n'},

      {"color",    no_argument,       NULL, 'C'},

      {"colour",   no_argument,       NULL, 'C'},

      {NULL,       0,                 NULL, 0 }

    };

  int aflag = 0;

  int bflag = 0;

  char *cvalue = NULL;

  int Cflag = 0;

  int nflag = 0;

  int index;

  int c;

  int result = 0;

  while ((c = getopt_long (argc, argv, "abc:", options, NULL)) >= 0)

    switch (c)

      {

      case 'a':

	aflag = 1;

	break;

      case 'b':

	bflag = 1;

	break;

      case 'c':

	cvalue = optarg;

	break;

      case 'C':

	++Cflag;

	break;

      case '?':

	fputs ("Unknown option.\n", stderr);

	return 1;

      default:

	fprintf (stderr, "This should never happen!\n");

	return 1;

      case 'r':

	printf ("--required %s\n", optarg);

	result |= strcmp (optarg, "foobar") != 0;

	break;

      case 'o':

	printf ("--optional %s\n", optarg);

	result |= optarg == NULL || strcmp (optarg, "bazbug") != 0;

	break;

      case 'n':

	puts ("--none");

	nflag = 1;

	break;

      }

  printf ("aflag = %d, bflag = %d, cvalue = %s, Cflags = %d, nflag = %d\n",

	  aflag, bflag, cvalue, Cflag, nflag);

  result |= (aflag != 1 || bflag != 1 || cvalue == NULL

	     || strcmp (cvalue, "foobar") != 0 || Cflag != 3 || nflag != 1);

  for (index = optind; index < argc; index++)

    printf ("Non-option argument %s\n", argv[index]);

  result |= optind + 1 != argc || strcmp (argv[optind], "random") != 0;

  return result;

}