[HaBo]

while( (c1 = getopt(argc, argv, "si")) != EOF ){
		switch( c1 ){
			case 's':
				opt_s = true;
				break;
			case 'i':
				opt_i = true;
				break;
			case '?':
				usage();
				break;
			default:
				assert(0);
				break;
		}
	}

while( (c1 = getopt(argc, argv, "si")) != -1 ){
...
}

int
main (int argc, char **argv)
{
  int aflag = 0;
  int bflag = 0;
  char *cvalue = NULL;
  int index;
  int c;

  opterr = 0;

  while ((c = getopt (argc, argv, "ab:")) != -1)
    switch (c)
      {
      case 'a':
        aflag = 1;
        break;
      case 'b':
        bflag = 1;
        break;
      default:
        abort ();
      }
  
 // hier abgrabschen und gucken
  printf ("aflag = %d, bflag = %d, cvalue = %s\n", aflag, bflag, cvalue);

  return 0;
}