/** \file wgetopt.h
  A version of the getopt library for use with wide character strings.

  This is simply the gnu getopt library, but converted for use with
  wchar_t instead of char. This is not usually useful since the argv
  array is always defined to be of type char**, but in fish, all
  internal commands use wide characters and hence this library is
  useful.

  If you want to use this version of getopt in your program,
  download the fish sourcecode, available at <a
  href='http://fishshell.com'>the fish homepage</a>. Extract
  the sourcode, copy wgetopt.c and wgetopt.h into your program
  directory, include wgetopt.h in your program, and use all the
  regular getopt functions, prefixing every function, global
  variable and structure with a 'w', and use only wide character
  strings. There are no other functional changes in this version of
  getopt besides using wide character strings.

  For examples of how to use wgetopt, see the fish builtin
  functions, many of which are defined in builtin.c.

*/


/* Declarations for getopt.
   Copyright (C) 1989, 90, 91, 92, 93, 94 Free Software Foundation, Inc.

This file is part of the GNU C Library.  Its master source is NOT part of
the C library, however.  The master source lives in /gd/gnu/lib.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#ifndef FISH_WGETOPT_H
#define FISH_WGETOPT_H

#include <wchar.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.  */

    extern wchar_t *woptarg;

    /** 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 EOF, this is the index of the first of the
       non-option elements that the caller should itself scan.

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

    extern int woptind;

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

    extern int wopterr;

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

    extern int woptopt;

    /** 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 woption
    {
        /**
           long name for switch
        */
#if defined (__STDC__) && __STDC__
        const wchar_t *name;
#else
        wchar_t *name;
#endif
        /**
          Must be one of no_argument, required_argument and
          optional_argument.

          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;

        /**
          If non-null, the flag whose value should be set if this switch is encountered
        */
        int *flag;

        /**
          If \c flag is non-null, this is the value that flag will be set
          to. Otherwise, this is the return-value of the function call.
        */
        int val;
    };

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

    /**
       Specifies that a switch does not accept an argument
    */
#define  no_argument    0
    /**
       Specifies that a switch requires an argument
    */
#define required_argument  1
    /**
       Specifies that a switch accepts an optional argument
    */
#define optional_argument  2

#if defined (__STDC__) && __STDC__
#ifdef __GNU_LIBRARY__
    /**
      Get options from argument list. See the glibc manual for information on how to use this function.
    */
    extern int wgetopt(int argc, wchar_t *const *argv, const wchar_t *shortopts);
#else /* not __GNU_LIBRARY__ */

    extern int wgetopt();
#endif /* __GNU_LIBRARY__ */
    /**
      Get options from argument list. See the glibc manual for information on how to use this function.
     */
    extern int wgetopt_long(int argc, wchar_t *const *argv, const wchar_t *shortopts,
                            const struct woption *longopts, int *longind);
    /**
      Get options from argument list. See the glibc manual for information on how to use this function.
     */
    extern int wgetopt_long_only(int argc, wchar_t *const *argv,
                                 const wchar_t *shortopts,
                                 const struct woption *longopts, int *longind);

    /**
      Internal only.  Users should not call this directly.
    */
    extern int _wgetopt_internal(int argc, wchar_t *const *argv,
                                 const wchar_t *shortopts,
                                 const struct woption *longopts, int *longind,
                                 int long_only);
#else /* not __STDC__ */

    /**
      Get options from argument list. See the glibc manual for information on how to use this function.
     */
    extern int wgetopt();

    /**
      Get options from argument list. See the glibc manual for information on how to use this function.
     */
    extern int wgetopt_long();

    /**
      Get options from argument list. See the glibc manual for information on how to use this function.
     */
    extern int wgetopt_long_only();

    /**
      Internal only.  Users should not call this directly.
    */
    extern int _wgetopt_internal();
#endif /* __STDC__ */

#ifdef  __cplusplus
}
#endif

#endif /* FISH_WGETOPT_H */
