if (optind == 0)	optind = 1;	/* Don't scan ARGV[0], the program name.  */      optstring = _getopt_initialize (argc, argv, optstring);      __getopt_initialized = 1;    }  /* Test whether ARGV[optind] points to a non-option argument.     Either it does not have option syntax, or there is an environment flag     from the shell indicating it is not an option.  The later information     is only used when the used in the GNU libc.  */#ifdef _LIBC#define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0'	      \		     || (optind < nonoption_flags_len			      \			 && __getopt_nonoption_flags[optind] == '1'))#else#define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')#endif  if (nextchar == NULL || *nextchar == '\0')    {      /* Advance to the next ARGV-element.  */      /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been	 moved back by the user (who may also have changed the arguments).  */      if (last_nonopt > optind)	last_nonopt = optind;      if (first_nonopt > optind)	first_nonopt = optind;      if (ordering == PERMUTE)	{	  /* If we have just processed some options following some non-options,	     exchange them so that the options come first.  */	  if (first_nonopt != last_nonopt && last_nonopt != optind)	    exchange ((char **) argv);	  else if (last_nonopt != optind)	    first_nonopt = optind;	  /* Skip any additional non-options	     and extend the range of non-options previously skipped.  */	  while (optind < argc && NONOPTION_P)	    optind++;	  last_nonopt = optind;	}      /* The special ARGV-element `--' means premature end of options.	 Skip it like a null option,	 then exchange with previous non-options as if it were an option,	 then skip everything else like a non-option.  */      if (optind != argc && !strcmp (argv[optind], "--"))	{	  optind++;	  if (first_nonopt != last_nonopt && last_nonopt != optind)	    exchange ((char **) argv);	  else if (first_nonopt == last_nonopt)	    first_nonopt = optind;	  last_nonopt = argc;	  optind = argc;	}      /* If we have done all the ARGV-elements, stop the scan	 and back over any non-options that we skipped and permuted.  */      if (optind == argc)	{	  /* Set the next-arg-index to point at the non-options	     that we previously skipped, so the caller will digest them.  */	  if (first_nonopt != last_nonopt)	    optind = first_nonopt;	  return -1;	}      /* If we have come to a non-option and did not permute it,	 either stop the scan or describe it to the caller and pass it by.  */      if (NONOPTION_P)	{	  if (ordering == REQUIRE_ORDER)	    return -1;	  optarg = argv[optind++];	  return 1;	}      /* We have found another option-ARGV-element.	 Skip the initial punctuation.  */      nextchar = (argv[optind] + 1		  + (longopts != NULL && argv[optind][1] == '-'));    }  /* Decode the current option-ARGV-element.  */  /* Check whether the ARGV-element is a long option.     If long_only and the ARGV-element has the form "-f", where f is     a valid short option, don't consider it an abbreviated form of     a long option that starts with f.  Otherwise there would be no     way to give the -f short option.     On the other hand, if there's a long option "fubar" and     the ARGV-element is "-fu", do consider that an abbreviation of     the long option, just like "--fu", and not "-f" with arg "u".     This distinction seems to be the most useful approach.  */  if (longopts != NULL      && (argv[optind][1] == '-'	  || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))    {      char *nameend;      const struct option *p;      const struct option *pfound = NULL;      int exact = 0;      int ambig = 0;      int indfound = -1;      int option_index;      for (nameend = nextchar; *nameend && *nameend != '='; nameend++)	/* Do nothing.  */ ;      /* Test all long options for either exact match	 or abbreviated matches.  */      for (p = longopts, option_index = 0; p->name; p++, option_index++)	if (!strncmp (p->name, nextchar, nameend - nextchar))	  {	    if ((unsigned int) (nameend - nextchar)		== (unsigned int) strlen (p->name))	      {		/* Exact match found.  */		pfound = p;		indfound = option_index;		exact = 1;		break;	      }	    else if (pfound == NULL)	      {		/* First nonexact match found.  */		pfound = p;		indfound = option_index;	      }	    else	      /* Second or later nonexact match found.  */	      ambig = 1;	  }      if (ambig && !exact)	{	  if (opterr)	    fprintf (stderr, _("%s: option `%s' is ambiguous\n"),		     argv[0], argv[optind]);	  nextchar += strlen (nextchar);	  optind++;	  optopt = 0;	  return '?';	}      if (pfound != NULL)	{	  option_index = indfound;	  optind++;	  if (*nameend)	    {	      /* Don't test has_arg with >, because some C compilers don't		 allow it to be used on enums.  */	      if (pfound->has_arg)		optarg = nameend + 1;	      else		{		  if (opterr)		    {		      if (argv[optind - 1][1] == '-')			/* --option */			fprintf (stderr,			     _("%s: option `--%s' doesn't allow an argument\n"),				 argv[0], pfound->name);		      else			/* +option or -option */			fprintf (stderr,			     _("%s: option `%c%s' doesn't allow an argument\n"),				 argv[0], argv[optind - 1][0], pfound->name);		    }		  nextchar += strlen (nextchar);		  optopt = pfound->val;		  return '?';		}	    }	  else if (pfound->has_arg == 1)	    {	      if (optind < argc)		optarg = argv[optind++];	      else		{		  if (opterr)		    fprintf (stderr,			   _("%s: option `%s' requires an argument\n"),			   argv[0], argv[optind - 1]);		  nextchar += strlen (nextchar);		  optopt = pfound->val;		  return optstring[0] == ':' ? ':' : '?';		}	    }	  nextchar += strlen (nextchar);	  if (longind != NULL)	    *longind = option_index;	  if (pfound->flag)	    {	      *(pfound->flag) = pfound->val;	      return 0;	    }	  return pfound->val;	}      /* Can't find it as a long option.  If this is not getopt_long_only,	 or the option starts with '--' or is not a valid short	 option, then it's an error.	 Otherwise interpret it as a short option.  */      if (!long_only || argv[optind][1] == '-'	  || my_index (optstring, *nextchar) == NULL)	{	  if (opterr)	    {	      if (argv[optind][1] == '-')		/* --option */		fprintf (stderr, _("%s: unrecognized option `--%s'\n"),			 argv[0], nextchar);	      else		/* +option or -option */		fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),			 argv[0], argv[optind][0], nextchar);	    }	  nextchar = (char *) "";	  optind++;	  optopt = 0;	  return '?';	}    }  /* Look at and handle the next short option-character.  */  {    char c = *nextchar++;    char *temp = my_index (optstring, c);    /* Increment `optind' when we start to process its last character.  */    if (*nextchar == '\0')      ++optind;    if (temp == NULL || c == ':')      {	if (opterr)	  {	    if (posixly_correct)	      /* 1003.2 specifies the format of this message.  */	      fprintf (stderr, _("%s: illegal option -- %c\n"),		       argv[0], c);	    else	      fprintf (stderr, _("%s: invalid option -- %c\n"),		       argv[0], c);	  }	optopt = c;	return '?';      }    /* Convenience. Treat POSIX -W foo same as long option --foo */    if (temp[0] == 'W' && temp[1] == ';')      {	char *nameend;	const struct option *p;	const struct option *pfound = NULL;	int exact = 0;	int ambig = 0;	int indfound = 0;	int option_index;	/* This is an option that requires an argument.  */	if (*nextchar != '\0')	  {	    optarg = nextchar;	    /* If we end this ARGV-element by taking the rest as an arg,	       we must advance to the next element now.  */	    optind++;	  }	else if (optind == argc)	  {	    if (opterr)	      {		/* 1003.2 specifies the format of this message.  */		fprintf (stderr, _("%s: option requires an argument -- %c\n"),			 argv[0], c);	      }	    optopt = c;	    if (optstring[0] == ':')	      c = ':';	    else	      c = '?';	    return c;	  }	else	  /* We already incremented `optind' once;	     increment it again when taking next ARGV-elt as argument.  */	  optarg = argv[optind++];	/* optarg is now the argument, see if it's in the	   table of longopts.  */	for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)	  /* Do nothing.  */ ;	/* Test all long options for either exact match	   or abbreviated matches.  */	for (p = longopts, option_index = 0; p->name; p++, option_index++)	  if (!strncmp (p->name, nextchar, nameend - nextchar))	    {	      if ((unsigned int) (nameend - nextchar) == strlen (p->name))		{		  /* Exact match found.  */		  pfound = p;		  indfound = option_index;		  exact = 1;		  break;		}	      else if (pfound == NULL)		{		  /* First nonexact match found.  */		  pfound = p;		  indfound = option_index;		}	      else		/* Second or later nonexact match found.  */		ambig = 1;	    }	if (ambig && !exact)	  {	    if (opterr)	      fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),		       argv[0], argv[optind]);	    nextchar += strlen (nextchar);	    optind++;	    return '?';	  }	if (pfound != NULL)	  {	    option_index = indfound;	    if (*nameend)	      {		/* Don't test has_arg with >, because some C compilers don't		   allow it to be used on enums.  */		if (pfound->has_arg)		  optarg = nameend + 1;		else		  {		    if (opterr)		      fprintf (stderr, _("\%s: option `-W %s' doesn't allow an argument\n"),			       argv[0], pfound->name);		    nextchar += strlen (nextchar);		    return '?';		  }	      }	    else if (pfound->has_arg == 1)	      {		if (optind < argc)		  optarg = argv[optind++];		else		  {		    if (opterr)		      fprintf (stderr,			       _("%s: option `%s' requires an argument\n"),			       argv[0], argv[optind - 1]);		    nextchar += strlen (nextchar);		    return optstring[0] == ':' ? ':' : '?';		  }	      }	    nextchar += strlen (nextchar);	    if (longind != NULL)	      *longind = option_index;	    if (pfound->flag)	      {		*(pfound->flag) = pfound->val;		return 0;	      }	    return pfound->val;	  }	  nextchar = NULL;	  return 'W';	/* Let the application handle it.   */      }    if (temp[1] == ':')      {	if (temp[2] == ':')	  {	    /* This is an option that accepts an argument optionally.  */	    if (*nextchar != '\0')	      {		optarg = nextchar;		optind++;	      }	    else	      optarg = NULL;	    nextchar = NULL;	  }	else	  {	    /* This is an option that requires an argument.  */	    if (*nextchar != '\0')	      {		optarg = nextchar;		/* If we end this ARGV-element by taking the rest as an arg,		   we must advance to the next element now.  */		optind++;	      }	    else if (optind == argc)	      {		if (opterr)		  {		    /* 1003.2 specifies the format of this message.  */		    fprintf (stderr,			   _("%s: option requires an argument -- %c\n"),			   argv[0], c);		  }		optopt = c;		if (optstring[0] == ':')		  c = ':';		else		  c = '?';	      }	    else	      /* We already incremented `optind' once;		 increment it again when taking next ARGV-elt as argument.  */	      optarg = argv[optind++];	    nextchar = NULL;	  }      }    return c;  }}intgetopt (argc, argv, optstring)     int argc;     char *const *argv;     const char *optstring;{  return _getopt_internal (argc, argv, optstring,			   (const struct option *) 0,			   (int *) 0,			   0);}#endif	/* Not ELIDE_CODE.  */#ifdef TEST/* Compile with -DTEST to make an executable for use in testing   the above definition of `getopt'.  */intmain (argc, argv)     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 == -1)	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);}#endif /* TEST */