/* Declarations for getopt.

   Copyright (C) 1989-2016 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, see

   <http://www.gnu.org/licenses/>.  */

#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

#ifndef __THROW

# ifndef __GNUC_PREREQ

#  define __GNUC_PREREQ(maj, min) (0)

# endif

# if defined __cplusplus && __GNUC_PREREQ (2,8)

#  define __THROW	throw ()

# else

#  define __THROW

# endif

#endif

#ifdef	__cplusplus

extern "C" {

#endif

#ifdef __KLIBC__

/* OS/2 kLIBC has already getopt(). So to avoid name clash, rename

   them here. */

# define optarg		gawk_optarg

# define optind		gawk_optind

# define opterr		gawk_opterr

# define optopt		gawk_optopt

# define getopt				gawk_getopt

# define getopt_long		gawk_getopt_long

# define getopt_long_only	gawk_getopt_long_only

#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.  */

extern 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.  */

extern int optind;

/* Callers store zero here to inhibit the error message `getopt' prints

   for unrecognized options.  */

extern int opterr;

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

extern 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

{

  const char *name;

  /* 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'.  */

#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.  */

extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)

       __THROW;

# if defined __need_getopt && defined __USE_POSIX2 \

  && !defined __USE_POSIX_IMPLICITLY && !defined __USE_GNU

/* The GNU getopt has more functionality than the standard version.  The

   additional functionality can be disable at runtime.  This redirection

   helps to also do this at runtime.  */

#  ifdef __REDIRECT

  extern int __REDIRECT_NTH (getopt, (int ___argc, char *const *___argv,

				      const char *__shortopts),

			     __posix_getopt);

#  else

extern int __posix_getopt (int ___argc, char *const *___argv,

			   const char *__shortopts) __THROW;

#   define getopt __posix_getopt

#  endif

# endif

#else /* not __GNU_LIBRARY__ */

extern int getopt ();

#endif /* __GNU_LIBRARY__ */

#ifndef __need_getopt

extern int getopt_long (int ___argc, char *const *___argv,

			const char *__shortopts,

		        const struct option *__longopts, int *__longind)

       __THROW;

extern int getopt_long_only (int ___argc, char *const *___argv,

			     const char *__shortopts,

		             const struct option *__longopts, int *__longind)

       __THROW;

#endif

#ifdef	__cplusplus

}

#endif

/* Make sure we later can get all the definitions and declarations.  */

#undef __need_getopt

#endif /* getopt.h */