/* Declarations for getopt (GNU extensions).

   Copyright (C) 1989-2019 Free Software Foundation, Inc.

   This file is part of the GNU C Library and is also part of gnulib.

   Patches to this file should be submitted to both projects.

   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

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

#ifndef _GETOPT_EXT_H

#define _GETOPT_EXT_H 1

/* This header should not be used directly; include getopt.h instead.

   Unlike most bits headers, it does not have a protective #error,

   because the guard macro for getopt.h in gnulib is not fixed.  */

__BEGIN_DECLS

/* 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

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

			const char *__shortopts,

		        const struct option *__longopts, int *__longind)

       __THROW _GL_ARG_NONNULL ((2, 3));

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

			     const char *__shortopts,

		             const struct option *__longopts, int *__longind)

       __THROW _GL_ARG_NONNULL ((2, 3));

__END_DECLS

#endif /* _GETOPT_EXT_H */