getopt.c

Datamatrix二维码库和测试程序,运行于linux,仔细研究可以很容易转化成VC程序,有这就没必要化钱买个控件了,本人libdmtx-0.3版本转化过,的确可行,现在把找到该版本的libdmtx

      optstring = _getopt_initialize (argc, argv, optstring, d);
      d->__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.  */
#if defined _LIBC && defined USE_NONOPTION_FLAGS
# define NONOPTION_P (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0' \
		      || (d->optind < d->__nonoption_flags_len		      \
			  && __getopt_nonoption_flags[d->optind] == '1'))
#else
# define NONOPTION_P (argv[d->optind][0] != '-' || argv[d->optind][1] == '\0')
#endif

  if (d->__nextchar == NULL || *d->__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 (d->__last_nonopt > d->optind)
	d->__last_nonopt = d->optind;
      if (d->__first_nonopt > d->optind)
	d->__first_nonopt = d->optind;

      if (d->__ordering == PERMUTE)
	{
	  /* If we have just processed some options following some non-options,
	     exchange them so that the options come first.  */

	  if (d->__first_nonopt != d->__last_nonopt
	      && d->__last_nonopt != d->optind)
	    exchange ((char **) argv, d);
	  else if (d->__last_nonopt != d->optind)
	    d->__first_nonopt = d->optind;

	  /* Skip any additional non-options
	     and extend the range of non-options previously skipped.  */

	  while (d->optind < argc && NONOPTION_P)
	    d->optind++;
	  d->__last_nonopt = d->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 (d->optind != argc && !strcmp (argv[d->optind], "--"))
	{
	  d->optind++;

	  if (d->__first_nonopt != d->__last_nonopt
	      && d->__last_nonopt != d->optind)
	    exchange ((char **) argv, d);
	  else if (d->__first_nonopt == d->__last_nonopt)
	    d->__first_nonopt = d->optind;
	  d->__last_nonopt = argc;

	  d->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 (d->optind == argc)
	{
	  /* Set the next-arg-index to point at the non-options
	     that we previously skipped, so the caller will digest them.  */
	  if (d->__first_nonopt != d->__last_nonopt)
	    d->optind = d->__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 (d->__ordering == REQUIRE_ORDER)
	    return -1;
	  d->optarg = argv[d->optind++];
	  return 1;
	}

      /* We have found another option-ARGV-element.
	 Skip the initial punctuation.  */

      d->__nextchar = (argv[d->optind] + 1
		  + (longopts != NULL && argv[d->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[d->optind][1] == '-'
	  || (long_only && (argv[d->optind][2]
			    || !strchr (optstring, argv[d->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 = d->__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, d->__nextchar, nameend - d->__nextchar))
	  {
	    if ((unsigned int) (nameend - d->__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 if (long_only
		     || pfound->has_arg != p->has_arg
		     || pfound->flag != p->flag
		     || pfound->val != p->val)
	      /* 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 `%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;

		  __fxprintf (NULL, "%s", buf);

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

		  free (buf);
		}
#else
	      fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
		       argv[0], argv[d->optind]);
#endif
	    }
	  d->__nextchar += strlen (d->__nextchar);
	  d->optind++;
	  d->optopt = 0;
	  return '?';
	}

      if (pfound != NULL)
	{
	  option_index = indfound;
	  d->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)
		d->optarg = nameend + 1;
	      else
		{
		  if (print_errors)
		    {
#if defined _LIBC && defined USE_IN_LIBIO
		      char *buf;
		      int n;
#endif

		      if (argv[d->optind - 1][1] == '-')
			{
			  /* --option */
#if defined _LIBC && defined USE_IN_LIBIO
			  n = __asprintf (&buf, _("\
%s: option `--%s' doesn't allow an argument\n"),
					  argv[0], pfound->name);
#else
			  fprintf (stderr, _("\
%s: option `--%s' doesn't allow an argument\n"),
				   argv[0], pfound->name);
#endif
			}
		      else
			{
			  /* +option or -option */
#if defined _LIBC && defined USE_IN_LIBIO
			  n = __asprintf (&buf, _("\
%s: option `%c%s' doesn't allow an argument\n"),
					  argv[0], argv[d->optind - 1][0],
					  pfound->name);
#else
			  fprintf (stderr, _("\
%s: option `%c%s' doesn't allow an argument\n"),
				   argv[0], argv[d->optind - 1][0],
				   pfound->name);
#endif
			}

#if defined _LIBC && defined USE_IN_LIBIO
		      if (n >= 0)
			{
			  _IO_flockfile (stderr);

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

			  __fxprintf (NULL, "%s", buf);

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

			  free (buf);
			}
#endif
		    }

		  d->__nextchar += strlen (d->__nextchar);

		  d->optopt = pfound->val;
		  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;

			  __fxprintf (NULL, "%s", buf);

			  ((_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);
		  d->optopt = pfound->val;
		  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;
	}

      /* 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[d->optind][1] == '-'
	  || strchr (optstring, *d->__nextchar) == NULL)
	{
	  if (print_errors)
	    {
#if defined _LIBC && defined USE_IN_LIBIO
	      char *buf;
	      int n;
#endif

	      if (argv[d->optind][1] == '-')
		{
		  /* --option */
#if defined _LIBC && defined USE_IN_LIBIO
		  n = __asprintf (&buf, _("%s: unrecognized option `--%s'\n"),
				  argv[0], d->__nextchar);
#else
		  fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
			   argv[0], d->__nextchar);
#endif
		}
	      else
		{
		  /* +option or -option */
#if defined _LIBC && defined USE_IN_LIBIO
		  n = __asprintf (&buf, _("%s: unrecognized option `%c%s'\n"),
				  argv[0], argv[d->optind][0], d->__nextchar);
#else
		  fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
			   argv[0], argv[d->optind][0], d->__nextchar);
#endif
		}

#if defined _LIBC && defined USE_IN_LIBIO
	      if (n >= 0)
		{
		  _IO_flockfile (stderr);

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

		  __fxprintf (NULL, "%s", buf);

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

		  free (buf);
		}
#endif
	    }
	  d->__nextchar = (char *) "";
	  d->optind++;
	  d->optopt = 0;
	  return '?';
	}
    }

  /* Look at and handle the next short option-character.  */

  {
    char c = *d->__nextchar++;
    char *temp = strchr (optstring, c);

    /* Increment `optind' when we start to process its last character.  */
    if (*d->__nextchar == '\0')
      ++d->optind;

    if (temp == NULL || c == ':')
      {
	if (print_errors)
	  {
#if defined _LIBC && defined USE_IN_LIBIO
	      char *buf;
	      int n;
#endif

	    if (d->__posixly_correct)
	      {
		/* 1003.2 specifies the format of this message.  */
#if defined _LIBC && defined USE_IN_LIBIO
		n = __asprintf (&buf, _("%s: illegal option -- %c\n"),
				argv[0], c);
#else
		fprintf (stderr, _("%s: illegal option -- %c\n"), argv[0], c);
#endif
	      }
	    else
	      {
#if defined _LIBC && defined USE_IN_LIBIO
		n = __asprintf (&buf, _("%s: invalid option -- %c\n"),
				argv[0], c);
#else
		fprintf (stderr, _("%s: invalid option -- %c\n"), argv[0], c);
#endif
	      }