getopt.c

MIDI解码程序(用VC编写)

		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)
	    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 (print_errors)
		    {
		      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 (print_errors)
		    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] == '-'
	  || strchr (optstring, *nextchar) == NULL)
	{
	  if (print_errors)
	    {
	      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 = strchr (optstring, c);

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

    if (temp == NULL || c == ':')
      {
	if (print_errors)
	  {
	    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 (print_errors)
	      {
		/* 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 (print_errors)
	      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 (print_errors)
		      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 (print_errors)
		      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 (print_errors)
		  {
		    /* 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;
  }
}

#ifndef HAVE_GETOPT_LONG
int
getopt_long (int argc, char *const *argv, const char *options,
	     const struct option *long_options, int *opt_index)
{
  return _getopt_internal (argc, argv, options, long_options, opt_index, 0);
}

/* Like getopt_long, but '-' as well as '--' can indicate a long option.
   If an option that starts with '-' (not '--') doesn't match a long option,
   but does match a short option, it is parsed as a short option
   instead.  */

int
getopt_long_only (int argc, char *const *argv, const char *options,
		  const struct option *long_options, int *opt_index)
{
  return _getopt_internal (argc, argv, options, long_options, opt_index, 1);
}
#endif

#ifndef HAVE_GETOPT
int
getopt (int argc, char *const *argv, const char *optstring)
{
  return _getopt_internal (argc, argv, optstring,
			   (const struct option *) 0,
			   (int *) 0,
			   0);
}
#endif

#endif