getopt.c

制作2.6内核的CLFS时 使用的diffutils-2.8.7.tar.gz包

		if (_IO_fwide (stderr, 0) > 0)
		  __fwprintf (stderr, L"%s", buf);
		else
		  fputs (buf, stderr);

		((_IO_FILE *) stderr)->_flags2 = old_flags2;
		_IO_funlockfile (stderr);

		free (buf);
	      }
#endif
	  }
	d->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 (*d->__nextchar != '\0')
	  {
	    d->optarg = d->__nextchar;
	    /* If we end this ARGV-element by taking the rest as an arg,
	       we must advance to the next element now.  */
	    d->optind++;
	  }
	else if (d->optind == argc)
	  {
	    if (print_errors)
	      {
		/* 1003.2 specifies the format of this message.  */
#if defined _LIBC && defined USE_IN_LIBIO
		char *buf;

		if (__asprintf (&buf,
				_("%s: option requires an argument -- %c\n"),
				argv[0], c) >= 0)
		  {
		    _IO_flockfile (stderr);

		    int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
		    ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;

		    if (_IO_fwide (stderr, 0) > 0)
		      __fwprintf (stderr, L"%s", buf);
		    else
		      fputs (buf, stderr);

		    ((_IO_FILE *) stderr)->_flags2 = old_flags2;
		    _IO_funlockfile (stderr);

		    free (buf);
		  }
#else
		fprintf (stderr, _("%s: option requires an argument -- %c\n"),
			 argv[0], c);
#endif
	      }
	    d->optopt = c;
	    if (optstring[0] == ':')
	      c = ':';
	    else
	      c = '?';
	    return c;
	  }
	else
	  /* We already incremented `d->optind' once;
	     increment it again when taking next ARGV-elt as argument.  */
	  d->optarg = argv[d->optind++];

	/* optarg is now the argument, see if it's in the
	   table of longopts.  */

	for (d->__nextchar = nameend = d->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, d->__nextchar, nameend - d->__nextchar))
	    {
	      if ((unsigned int) (nameend - d->__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 (print_errors)
	      {
#if defined _LIBC && defined USE_IN_LIBIO
		char *buf;

		if (__asprintf (&buf, _("%s: option `-W %s' is ambiguous\n"),
				argv[0], argv[d->optind]) >= 0)
		  {
		    _IO_flockfile (stderr);

		    int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
		    ((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;

		    if (_IO_fwide (stderr, 0) > 0)
		      __fwprintf (stderr, L"%s", buf);
		    else
		      fputs (buf, stderr);

		    ((_IO_FILE *) stderr)->_flags2 = old_flags2;
		    _IO_funlockfile (stderr);

		    free (buf);
		  }
#else
		fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),
			 argv[0], argv[d->optind]);
#endif
	      }
	    d->__nextchar += strlen (d->__nextchar);
	    d->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)
		  d->optarg = nameend + 1;
		else
		  {
		    if (print_errors)
		      {
#if defined _LIBC && defined USE_IN_LIBIO
			char *buf;

			if (__asprintf (&buf, _("\
%s: option `-W %s' doesn't allow an argument\n"),
					argv[0], pfound->name) >= 0)
			  {
			    _IO_flockfile (stderr);

			    int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
			    ((_IO_FILE *) stderr)->_flags2
			      |= _IO_FLAGS2_NOTCANCEL;

			    if (_IO_fwide (stderr, 0) > 0)
			      __fwprintf (stderr, L"%s", buf);
			    else
			      fputs (buf, stderr);

			    ((_IO_FILE *) stderr)->_flags2 = old_flags2;
			    _IO_funlockfile (stderr);

			    free (buf);
			  }
#else
			fprintf (stderr, _("\
%s: option `-W %s' doesn't allow an argument\n"),
				 argv[0], pfound->name);
#endif
		      }

		    d->__nextchar += strlen (d->__nextchar);
		    return '?';
		  }
	      }
	    else if (pfound->has_arg == 1)
	      {
		if (d->optind < argc)
		  d->optarg = argv[d->optind++];
		else
		  {
		    if (print_errors)
		      {
#if defined _LIBC && defined USE_IN_LIBIO
			char *buf;

			if (__asprintf (&buf, _("\
%s: option `%s' requires an argument\n"),
					argv[0], argv[d->optind - 1]) >= 0)
			  {
			    _IO_flockfile (stderr);

			    int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
			    ((_IO_FILE *) stderr)->_flags2
			      |= _IO_FLAGS2_NOTCANCEL;

			    if (_IO_fwide (stderr, 0) > 0)
			      __fwprintf (stderr, L"%s", buf);
			    else
			      fputs (buf, stderr);

			    ((_IO_FILE *) stderr)->_flags2 = old_flags2;
			    _IO_funlockfile (stderr);

			    free (buf);
			  }
#else
			fprintf (stderr,
				 _("%s: option `%s' requires an argument\n"),
				 argv[0], argv[d->optind - 1]);
#endif
		      }
		    d->__nextchar += strlen (d->__nextchar);
		    return optstring[0] == ':' ? ':' : '?';
		  }
	      }
	    d->__nextchar += strlen (d->__nextchar);
	    if (longind != NULL)
	      *longind = option_index;
	    if (pfound->flag)
	      {
		*(pfound->flag) = pfound->val;
		return 0;
	      }
	    return pfound->val;
	  }
	  d->__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 (*d->__nextchar != '\0')
	      {
		d->optarg = d->__nextchar;
		d->optind++;
	      }
	    else
	      d->optarg = NULL;
	    d->__nextchar = NULL;
	  }
	else
	  {
	    /* This is an option that requires an argument.  */
	    if (*d->__nextchar != '\0')
	      {
		d->optarg = d->__nextchar;
		/* If we end this ARGV-element by taking the rest as an arg,
		   we must advance to the next element now.  */
		d->optind++;
	      }
	    else if (d->optind == argc)
	      {
		if (print_errors)
		  {
		    /* 1003.2 specifies the format of this message.  */
#if defined _LIBC && defined USE_IN_LIBIO
		    char *buf;

		    if (__asprintf (&buf, _("\
%s: option requires an argument -- %c\n"),
				    argv[0], c) >= 0)
		      {
			_IO_flockfile (stderr);

			int old_flags2 = ((_IO_FILE *) stderr)->_flags2;
			((_IO_FILE *) stderr)->_flags2 |= _IO_FLAGS2_NOTCANCEL;

			if (_IO_fwide (stderr, 0) > 0)
			  __fwprintf (stderr, L"%s", buf);
			else
			  fputs (buf, stderr);

			((_IO_FILE *) stderr)->_flags2 = old_flags2;
			_IO_funlockfile (stderr);

			free (buf);
		      }
#else
		    fprintf (stderr,
			     _("%s: option requires an argument -- %c\n"),
			     argv[0], c);
#endif
		  }
		d->optopt = c;
		if (optstring[0] == ':')
		  c = ':';
		else
		  c = '?';
	      }
	    else
	      /* We already incremented `optind' once;
		 increment it again when taking next ARGV-elt as argument.  */
	      d->optarg = argv[d->optind++];
	    d->__nextchar = NULL;
	  }
      }
    return c;
  }
}

int
_getopt_internal (int argc, char *const *argv, const char *optstring,
		  const struct option *longopts, int *longind, int long_only)
{
  int result;

  getopt_data.optind = optind;
  getopt_data.opterr = opterr;

  result = _getopt_internal_r (argc, argv, optstring, longopts,
			       longind, long_only, &getopt_data);

  optind = getopt_data.optind;
  optarg = getopt_data.optarg;
  optopt = getopt_data.optopt;

  return result;
}

int
getopt (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'.  */

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 == -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 */