/* Declarations for getopt.
  Copyright (C) 1989-2024 Free Software Foundation, Inc.

  NOTE: The canonical source of this file is maintained with the GNU C Library.
  Bugs can be reported to [email protected].

  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 */

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