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// Iostreams base classes -*- C++ -*-

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006

// Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library 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 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 General Public License for more details.

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

// with this library; see the file COPYING.  If not, write to the Free

// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,

// USA.

// As a special exception, you may use this file as part of a free software

// library without restriction.  Specifically, if other files instantiate

// templates or use macros or inline functions from this file, or you compile

// this file and link it with other files to produce an executable, this

// file does not by itself cause the resulting executable to be covered by

// the GNU General Public License.  This exception does not however

// invalidate any other reasons why the executable file might be covered by

// the GNU General Public License.

//

// ISO C++ 14882: 27.4  Iostreams base classes

//

#include <ios>

#include <limits>

#include <bits/atomicity.h>

namespace std

{

  // Definitions for static const members of ios_base.

  const ios_base::fmtflags ios_base::boolalpha;

  const ios_base::fmtflags ios_base::dec;

  const ios_base::fmtflags ios_base::fixed;

  const ios_base::fmtflags ios_base::hex;

  const ios_base::fmtflags ios_base::internal;

  const ios_base::fmtflags ios_base::left;

  const ios_base::fmtflags ios_base::oct;

  const ios_base::fmtflags ios_base::right;

  const ios_base::fmtflags ios_base::scientific;

  const ios_base::fmtflags ios_base::showbase;

  const ios_base::fmtflags ios_base::showpoint;

  const ios_base::fmtflags ios_base::showpos;

  const ios_base::fmtflags ios_base::skipws;

  const ios_base::fmtflags ios_base::unitbuf;

  const ios_base::fmtflags ios_base::uppercase;

  const ios_base::fmtflags ios_base::adjustfield;

  const ios_base::fmtflags ios_base::basefield;

  const ios_base::fmtflags ios_base::floatfield;

  const ios_base::iostate ios_base::badbit;

  const ios_base::iostate ios_base::eofbit;

  const ios_base::iostate ios_base::failbit;

  const ios_base::iostate ios_base::goodbit;

  const ios_base::openmode ios_base::app;

  const ios_base::openmode ios_base::ate;

  const ios_base::openmode ios_base::binary;

  const ios_base::openmode ios_base::in;

  const ios_base::openmode ios_base::out;

  const ios_base::openmode ios_base::trunc;

  const ios_base::seekdir ios_base::beg;

  const ios_base::seekdir ios_base::cur;

  const ios_base::seekdir ios_base::end;

  _Atomic_word ios_base::Init::_S_refcount;

  bool ios_base::Init::_S_synced_with_stdio = true;

  ios_base::ios_base()

  : _M_precision(), _M_width(), _M_flags(), _M_exception(),

  _M_streambuf_state(), _M_callbacks(0), _M_word_zero(),

  _M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale()

  {

    // Do nothing: basic_ios::init() does it.  

    // NB: _M_callbacks and _M_word must be zero for non-initialized

    // ios_base to go through ~ios_base gracefully.

  }

  // 27.4.2.7  ios_base constructors/destructors

  ios_base::~ios_base()

  {

    _M_call_callbacks(erase_event);

    _M_dispose_callbacks();

    if (_M_word != _M_local_word)

      {

        delete [] _M_word;

        _M_word = 0;

      }

  }

  // 27.4.2.5  ios_base storage functions

  int

  ios_base::xalloc() throw()

  {

    // Implementation note: Initialize top to zero to ensure that

    // initialization occurs before main() is started.

    static _Atomic_word _S_top = 0;

    return __gnu_cxx::__exchange_and_add(&_S_top, 1) + 4;

  }

  void

  ios_base::register_callback(event_callback __fn, int __index)

  { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); }

  // 27.4.2.5  iword/pword storage

  ios_base::_Words&

  ios_base::_M_grow_words(int __ix, bool __iword)

  {

    // Precondition: _M_word_size <= __ix

    int __newsize = _S_local_word_size;

    _Words* __words = _M_local_word;

    if (__ix > _S_local_word_size - 1)

      {

        if (__ix < numeric_limits<int>::max())

          {

            __newsize = __ix + 1;

            try

              { __words = new _Words[__newsize]; }

            catch (...)

              {

                _M_streambuf_state |= badbit;

                if (_M_streambuf_state & _M_exception)

                  __throw_ios_failure(__N("ios_base::_M_grow_words "

                                      "allocation failed"));

                if (__iword)

                  _M_word_zero._M_iword = 0;

                else

                  _M_word_zero._M_pword = 0;

                return _M_word_zero;

              }

            for (int __i = 0; __i < _M_word_size; __i++)

              __words[__i] = _M_word[__i];

            if (_M_word && _M_word != _M_local_word)

              {

                delete [] _M_word;

                _M_word = 0;

              }

          }

        else

          {

            _M_streambuf_state |= badbit;

            if (_M_streambuf_state & _M_exception)

              __throw_ios_failure(__N("ios_base::_M_grow_words is not valid"));

            if (__iword)

              _M_word_zero._M_iword = 0;

            else

              _M_word_zero._M_pword = 0;

            return _M_word_zero;

          }

      }

    _M_word = __words;

    _M_word_size = __newsize;

    return _M_word[__ix];

  }

  void

  ios_base::_M_call_callbacks(event __e) throw()

  {

    _Callback_list* __p = _M_callbacks;

    while (__p)

      {

        try

          { (*__p->_M_fn) (__e, *this, __p->_M_index); }

        catch (...)

          { }

        __p = __p->_M_next;

      }

  }

  void

  ios_base::_M_dispose_callbacks(void)

  {

    _Callback_list* __p = _M_callbacks;

    while (__p && __p->_M_remove_reference() == 0)

      {

        _Callback_list* __next = __p->_M_next;

        delete __p;

        __p = __next;

      }

    _M_callbacks = 0;

  }

} // namespace std