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

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

// 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 <ostream>

#include <istream>

#include <fstream>

#include <bits/atomicity.h>

#include <ext/stdio_filebuf.h>

#include <ext/stdio_sync_filebuf.h>

namespace __gnu_internal

{

  using namespace __gnu_cxx;

  // Extern declarations for global objects in src/globals.cc.

  extern stdio_sync_filebuf<char> buf_cout_sync;

  extern stdio_sync_filebuf<char> buf_cin_sync;

  extern stdio_sync_filebuf<char> buf_cerr_sync;

  extern stdio_filebuf<char> buf_cout;

  extern stdio_filebuf<char> buf_cin;

  extern stdio_filebuf<char> buf_cerr;

#ifdef _GLIBCXX_USE_WCHAR_T

  extern stdio_sync_filebuf<wchar_t> buf_wcout_sync;

  extern stdio_sync_filebuf<wchar_t> buf_wcin_sync;

  extern stdio_sync_filebuf<wchar_t> buf_wcerr_sync;

  extern stdio_filebuf<wchar_t> buf_wcout;

  extern stdio_filebuf<wchar_t> buf_wcin;

  extern stdio_filebuf<wchar_t> buf_wcerr;

#endif

} // namespace __gnu_internal

namespace std

{

  using namespace __gnu_internal;

  extern istream cin;

  extern ostream cout;

  extern ostream cerr;

  extern ostream clog;

#ifdef _GLIBCXX_USE_WCHAR_T

  extern wistream wcin;

  extern wostream wcout;

  extern wostream wcerr;

  extern wostream wclog;

#endif

  ios_base::Init::Init()

  {

    if (__gnu_cxx::__exchange_and_add(&_S_refcount, 1) == 0)

      {

        // Standard streams default to synced with "C" operations.

        _S_synced_with_stdio = true;

        new (&buf_cout_sync) stdio_sync_filebuf<char>(stdout);

        new (&buf_cin_sync) stdio_sync_filebuf<char>(stdin);

        new (&buf_cerr_sync) stdio_sync_filebuf<char>(stderr);

        // The standard streams are constructed once only and never

        // destroyed.

        new (&cout) ostream(&buf_cout_sync);

        new (&cin) istream(&buf_cin_sync);

        new (&cerr) ostream(&buf_cerr_sync);

        new (&clog) ostream(&buf_cerr_sync);

        cin.tie(&cout);

        cerr.flags(ios_base::unitbuf);

#ifdef _GLIBCXX_USE_WCHAR_T

        new (&buf_wcout_sync) stdio_sync_filebuf<wchar_t>(stdout);

        new (&buf_wcin_sync) stdio_sync_filebuf<wchar_t>(stdin);

        new (&buf_wcerr_sync) stdio_sync_filebuf<wchar_t>(stderr);

        new (&wcout) wostream(&buf_wcout_sync);

        new (&wcin) wistream(&buf_wcin_sync);

        new (&wcerr) wostream(&buf_wcerr_sync);

        new (&wclog) wostream(&buf_wcerr_sync);

        wcin.tie(&wcout);

        wcerr.flags(ios_base::unitbuf);

#endif

        // NB: Have to set refcount above one, so that standard

        // streams are not re-initialized with uses of ios_base::Init

        // besides <iostream> static object, ie just using <ios> with

        // ios_base::Init objects.

        __gnu_cxx::__atomic_add(&_S_refcount, 1);

      }

  }

  ios_base::Init::~Init()

  {

    if (__gnu_cxx::__exchange_and_add(&_S_refcount, -1) == 2)

      {

        // Catch any exceptions thrown by basic_ostream::flush()

        try

          {

            // Flush standard output streams as required by 27.4.2.1.6

            cout.flush();

            cerr.flush();

            clog.flush();

#ifdef _GLIBCXX_USE_WCHAR_T

            wcout.flush();

            wcerr.flush();

            wclog.flush();

#endif

          }

        catch (...)

          { }

      }

  }

  bool

  ios_base::sync_with_stdio(bool __sync)

  {

    // _GLIBCXX_RESOLVE_LIB_DEFECTS

    // 49.  Underspecification of ios_base::sync_with_stdio

    bool __ret = ios_base::Init::_S_synced_with_stdio;

    // Turn off sync with C FILE* for cin, cout, cerr, clog iff

    // currently synchronized.

    if (!__sync && __ret)

      {

        // Make sure the standard streams are constructed.

        ios_base::Init __init;

        ios_base::Init::_S_synced_with_stdio = __sync;

        // Explicitly call dtors to free any memory that is

        // dynamically allocated by filebuf ctor or member functions,

        // but don't deallocate all memory by calling operator delete.

        buf_cout_sync.~stdio_sync_filebuf<char>();

        buf_cin_sync.~stdio_sync_filebuf<char>();

        buf_cerr_sync.~stdio_sync_filebuf<char>();

#ifdef _GLIBCXX_USE_WCHAR_T

        buf_wcout_sync.~stdio_sync_filebuf<wchar_t>();

        buf_wcin_sync.~stdio_sync_filebuf<wchar_t>();

        buf_wcerr_sync.~stdio_sync_filebuf<wchar_t>();

#endif

        // Create stream buffers for the standard streams and use

        // those buffers without destroying and recreating the

        // streams.

        new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out);

        new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in);

        new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out);

        cout.rdbuf(&buf_cout);

        cin.rdbuf(&buf_cin);

        cerr.rdbuf(&buf_cerr);

        clog.rdbuf(&buf_cerr);

#ifdef _GLIBCXX_USE_WCHAR_T

        new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out);

        new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in);

        new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out);

        wcout.rdbuf(&buf_wcout);

        wcin.rdbuf(&buf_wcin);

        wcerr.rdbuf(&buf_wcerr);

        wclog.rdbuf(&buf_wcerr);

#endif

      }

    return __ret;

  }

} // namespace std