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/* Getopt tests */
 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
 
 
int main (int argc, char **argv)
{
  int c;
  int digit_optind = 0;
 
  while (1)
    {
      int this_option_optind = optind ? optind : 1;
 
      c = getopt (argc, argv, "abc:d:0123456789");
      if (c == EOF)
	break;
 
      switch (c)
	{
	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");
    }
  exit (0);
}