#include <stdio.h>

int
main (argc, argv)
     int argc;
     char **argv;
{
  char c;
  int digit_optind = 0;

  while (1)
    {
      int this_option_optind = optind;
      char *name = '\0';
      int option_index = 0;
      static struct option long_options[]
	= {{ "add", 1, 0, 0 },
	   { "append", 0, 0, 0 },
	   { "delete", 1, 0, 0 },
	   { "verbose", 0, 0, 0 },
	   { "create", 0, 0, 0 },
	   { "file", 1, 0, 0 },
	   { 0, 0, 0, 0}};

      c = getopt_long (argc, argv, "abc:d:0123456789",
		       long_options, &option_index);
      if (c == EOF)
	break;
	switch (c)
	  {
	  case 0:
	    printf ("option %s", (long_options[option_index]).name);
	    if (optarg)
	      printf (" with arg %s", optarg);
	    printf ("\n");
	    break;

	  case '0':
	  case '1':
	  case '2':
	  case '3':
	  case '4':
	  case '5':
	  case '6':
	  case '7':
	  case '8':
	  case '9':
	    if (digit_optind != 0 && digit_optind != this_option_optind)
	      printf ("digits occur in two different argv-elements.\n");
	    digit_optind = this_option_optind;
	    printf ("option %c\n", c);
	    break;

	  case 'a':
	    printf ("option a\n");
	    break;

	  case 'b':
	    printf ("option b\n");
	    break;

	  case 'c':
	    printf ("option c with value `%s'\n", optarg);
	    break;

	  case '?':
	    break;

	  default:
	    printf ("?? getopt returned character code 0%o ??\n", c);
	  }
    }

  if (optind < argc)
    {
      printf ("non-option ARGV-elements: ");
      while (optind < argc)
	printf ("%s ", argv[optind++]);
      printf ("\n");
    }

  return 0;
}