getopt.c

C写的用软件无线电实现的GPS模拟程序

	{
	  /* 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 (argv);
	  else if (last_nonopt != optind)
	    first_nonopt = optind;

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

	  while (optind < argc
		 && (argv[optind][0] != '-'
		     || argv[optind][1] == 0)
		 && (_getopt_long_options == 0
		     || argv[optind][0] != '+'
		     || argv[optind][1] == 0))
	    optind++;
	  last_nonopt = optind;
	}

      /* 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 (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 EOF;
	}
	 
      /* 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 ((argv[optind][0] != '-' || argv[optind][1] == 0)
	  && (_getopt_long_options == 0
	      || argv[optind][0] != '+' || argv[optind][1] == 0))
	{
	  if (ordering == REQUIRE_ORDER)
	    return EOF;
	  optarg = argv[optind++];
	  return 1;
	}

      /* We have found another option-ARGV-element.
	 Start decoding its characters.  */

      nextchar = argv[optind] + 1;
    }

  if (_getopt_long_options != 0
      && (argv[optind][0] == '+'
	  || (_getopt_long_only && argv[optind][0] == '-'))
      )
    {
      CONST struct option *p;
      char *s = nextchar;
      int exact = 0;
      int ambig = 0;
      CONST struct option *pfound = 0;
      int indfound;

      while (*s && *s != '=') s++;

      /* Test all options for either exact match or abbreviated matches.  */
      for (p = _getopt_long_options, option_index = 0; p->name; 
	   p++, option_index++)
	if (!strncmp (p->name, nextchar, (size_t)(s - nextchar)))
	  {
	    if (s - nextchar == strlen( p->name))
	      {
		/* Exact match found.  */
		pfound = p;
		indfound = option_index;
		exact = 1;
		break;
	      }
	    else if (pfound == 0)
	      {
		/* First nonexact match found.  */
		pfound = p;
		indfound = option_index;
	      }
	    else
	      /* Second nonexact match found.  */
	      ambig = 1;
	  }

      if (ambig && !exact)
	{
	  fprintf (stderr, "%s: option `%s' is ambiguous\n",
		   ProgramName, argv[optind]);
	  nextchar += strlen (nextchar);			   
	  return '?';
	}

      if (pfound != 0)
	{
	  option_index = indfound;
	  optind++;
	  if (*s)
	    {
	      if (pfound->has_arg > 0)
		optarg = s + 1;
	      else
		{
		  fprintf (stderr,
			   "%s: option `%c%s' doesn't allow an argument\n",
			   ProgramName, argv[optind - 1][0], pfound->name);
		  nextchar += strlen (nextchar);			   
		  return '?';
		}
	    }
	  else if (pfound->has_arg == 1)
	    {
	      if (optind < argc)
		optarg = argv[optind++];
	      else
		{
		  fprintf (stderr, "%s: option `%s' requires an argument\n",
			   ProgramName, argv[optind - 1]);
		  nextchar += strlen (nextchar);		   
		  return '?';
		}
	    }
	  nextchar += strlen (nextchar);
	  if (pfound->flag)
	    *(pfound->flag) = pfound->val;
	  return 0;
	}
      /* Can't find it as a long option.  If this is getopt_long_only,
	 and the option starts with '-' and is a valid short
	 option, then interpret it as a short option.  Otherwise it's
	 an error.  */
      if (_getopt_long_only == 0 || argv[optind][0] == '+' ||
	  index (optstring, *nextchar) == 0)
	{
	  if (opterr != 0)
	    fprintf (stderr, "%s: unrecognized option `%c%s'\n",
		     ProgramName, argv[optind][0], nextchar);
	  nextchar += strlen (nextchar);		   
	  return '?';
	}
    }
 
  /* Look at and handle the next option-character.  */

  {
    char c = *nextchar++;
    char *temp = index (optstring, c);

    /* Increment `optind' when we start to process its last character.  */
    if (*nextchar == 0)
      optind++;

    if (temp == 0 || c == ':')
      {
	if (opterr != 0)
	  {
	    if (c < 040 || c >= 0177)
	      fprintf (stderr, "%s: unrecognized option, character code 0%o\n",
		       ProgramName, c);
	    else
	      fprintf (stderr, "%s: unrecognized option `-%c'\n",
		       ProgramName, c);
	  }
	return '?';
      }
    if (temp[1] == ':')
      {
	if (temp[2] == ':')
	  {
	    /* This is an option that accepts an argument optionally.  */
	    if (*nextchar != 0)
	      {
	        optarg = nextchar;
		optind++;
	      }
	    else
	      optarg = 0;
	    nextchar = 0;
	  }
	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 != 0)
		  fprintf (stderr, "%s: option `-%c' requires an argument\n",
			   ProgramName, c);
		c = '?';
	      }
	    else
	      /* We already incremented `optind' once;
		 increment it again when taking next ARGV-elt as argument.  */
	      optarg = argv[optind++];
	    nextchar = 0;
	  }
      }
    return c;
  }
}

#ifdef TEST

/* Compile with -DTEST to make an executable for use in testing
   the above definition of `getopt'.  */

UBYTE ProgramName[] = "getopt";

int
main ( int argc, char **argv)
{
  char c;
  int digit_optind = 0;

  while (1)
    {
      int this_option_optind = optind;
      if ((c = GetOpt (argc, argv, "abc:d:0123456789")) == 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");
    }

  return 0;
}

#endif /* TEST */

/* ============================ End of File ========================= */