monet_getopt.h

这个是内存数据库中的一个管理工具

/*
 * The contents of this file are subject to the MonetDB Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://monetdb.cwi.nl/Legal/MonetDBLicense-1.1.html
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is the MonetDB Database System.
 *
 * The Initial Developer of the Original Code is CWI.
 * Portions created by CWI are Copyright (C) 1997-2007 CWI.
 * All Rights Reserved.
 */

/* Declarations for getopt.
   Copyright (C) 1989-1994, 1996-1999, 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _GETOPT_H

#ifndef __need_getopt
# define _GETOPT_H 1
#endif

/* If __GNU_LIBRARY__ is not already defined, either we are being used
   standalone, or this is the first header included in the source file.
   If we are being used with glibc, we need to include <features.h>, but
   that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
   not defined, include <ctype.h>, which will pull in <features.h> for us
   if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
   doesn't flood the namespace with stuff the way some other headers do.)  */
#if !defined __GNU_LIBRARY__
# include <ctype.h>
#endif

#include "monet_utils.h"

#ifdef	__cplusplus
extern "C" {
#endif

/* For communication from `getopt' to the caller.
   When `getopt' finds an option that takes an argument,
   the argument value is returned here.
   Also, when `ordering' is RETURN_IN_ORDER,
   each non-option ARGV-element is returned here.  */

	mutils_export char *optarg;

/* Index in ARGV of the next element to be scanned.
   This is used for communication to and from the caller
   and for communication between successive calls to `getopt'.

   On entry to `getopt', zero means this is the first call; initialize.

   When `getopt' returns -1, this is the index of the first of the
   non-option elements that the caller should itself scan.

   Otherwise, `optind' communicates from one call to the next
   how much of ARGV has been scanned so far.  */

	mutils_export int optind;

/* Callers store zero here to inhibit the error message `getopt' prints
   for unrecognized options.  */

	mutils_export int opterr;

/* Set to an option character which was unrecognized.  */

	mutils_export int optopt;

#ifndef __need_getopt
/* Describe the long-named options requested by the application.
   The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
   of `struct option' terminated by an element containing a name which is
   zero.

   The field `has_arg' is:
   no_argument		(or 0) if the option does not take an argument,
   required_argument	(or 1) if the option requires an argument,
   optional_argument 	(or 2) if the option takes an optional argument.

   If the field `flag' is not NULL, it points to a variable that is set
   to the value given in the field `val' when the option is found, but
   left unchanged if the option is not found.

   To have a long-named option do something other than set an `int' to
   a compiled-in constant, such as set a value from `optarg', set the
   option's `flag' field to zero and its `val' field to a nonzero
   value (the equivalent single-letter option character, if there is
   one).  For long options that have a zero `flag' field, `getopt'
   returns the contents of the `val' field.  */

	struct option {
# if (defined __STDC__ && __STDC__) || defined __cplusplus
		const char *name;
# else
		char *name;
# endif
		/* has_arg can't be an enum because some compilers complain about
		   type mismatches in all the code that assumes it is an int.  */
		int has_arg;
		int *flag;
		int val;
	};

/* Names for the values of the `has_arg' field of `struct option'.  */

# define no_argument		0
# define required_argument	1
# define optional_argument	2
#endif				/* need getopt */


/* Get definitions and prototypes for functions to process the
   arguments in ARGV (ARGC of them, minus the program name) for
   options given in OPTS.

   Return the option character from OPTS just read.  Return -1 when
   there are no more options.  For unrecognized options, or options
   missing arguments, `optopt' is set to the option letter, and '?' is
   returned.

   The OPTS string is a list of characters which are recognized option
   letters, optionally followed by colons, specifying that that letter
   takes an argument, to be placed in `optarg'.

   If a letter in OPTS is followed by two colons, its argument is
   optional.  This behavior is specific to the GNU `getopt'.

   The argument `--' causes premature termination of argument
   scanning, explicitly telling `getopt' that there are no more
   options.

   If OPTS begins with `--', then non-option arguments are treated as
   arguments to the option '\0'.  This behavior is specific to the GNU
   `getopt'.  */

#if (defined __STDC__ && __STDC__) || defined __cplusplus
# ifdef __GNU_LIBRARY__
/* Many other libraries have conflicting prototypes for getopt, with
   differences in the consts, in stdlib.h.  To avoid compilation
   errors, only prototype getopt for the GNU C library.  */
#ifndef HAVE_GETOPT
	mutils_export int getopt(int __argc__, char *const *__argv__, const char *__shortopts);
#endif
# else				/* not __GNU_LIBRARY__ */
#ifndef HAVE_GETOPT
	mutils_export int getopt();
#endif
# endif				/* __GNU_LIBRARY__ */

# ifndef __need_getopt
	mutils_export int getopt_long(int __argc__, char *const *__argv__, const char *__shortopts, const struct option *__longopts, int *__longind);
	mutils_export int getopt_long_only(int __argc__, char *const *__argv__, const char *__shortopts, const struct option *__longopts, int *__longind);

/* Internal only.  Users should not call this directly.  */
	mutils_export int _getopt_internal(int __argc__, char *const *__argv__, const char *__shortopts, const struct option *__longopts, int *__longind, int __long_only);
# endif
#else				/* not __STDC__ */
#ifndef HAVE_GETOPT
	mutils_export int getopt();
#endif
# ifndef __need_getopt
	mutils_export int getopt_long();
	mutils_export int getopt_long_only();

	mutils_export int _getopt_internal();
# endif
#endif				/* __STDC__ */

#ifdef	__cplusplus
}
#endif
/* Make sure we later can get all the definitions and declarations.  */
#undef __need_getopt
#endif				/* getopt.h */