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/* Declarations for getopt.

   Copyright (C) 1989-2015 Free Software Foundation, Inc.

   NOTE: The canonical source of this file is maintained with the GNU C Library.

   Bugs can be reported to bug-glibc@gnu.org.

   This program is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by the

   Free Software Foundation; either version 2, or (at your option) any

   later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,

   USA.  */

#ifndef _GETOPT_H

#define _GETOPT_H 1

#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.  */

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;

/* 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__

  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

#if defined (__STDC__) && __STDC__

/* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is

   undefined, we haven't run the autoconf check so provide the

   declaration without arguments.  If it is 0, we checked and failed

   to find the declaration so provide a fully prototyped one.  If it

   is 1, we found it so don't provide any declaration at all.  */

#if !HAVE_DECL_GETOPT

#if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)

/* Many other libraries have conflicting prototypes for getopt, with

   differences in the consts, in unistd.h.  To avoid compilation

   errors, only prototype getopt for the GNU C library.  */

extern int getopt (int argc, char *const *argv, const char *shortopts);

#else

#ifndef __cplusplus

extern int getopt ();

#endif /* __cplusplus */

#endif

#endif /* !HAVE_DECL_GETOPT */

extern int getopt_long (int argc, char *const *argv, const char *shortopts,

		        const struct option *longopts, int *longind);

extern 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.  */

extern int _getopt_internal (int argc, char *const *argv,

			     const char *shortopts,

		             const struct option *longopts, int *longind,

			     int long_only);

#else /* not __STDC__ */

extern int getopt ();

extern int getopt_long ();

extern int getopt_long_only ();

extern int _getopt_internal ();

#endif /* __STDC__ */

#ifdef	__cplusplus

}

#endif

#endif /* getopt.h */