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// Iostreams base classes -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
// 2006, 2007, 2008, 2009, 2010, 2011
// 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 3, 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
//
// ISO C++ 14882: 27.4 Iostreams base classes
//
#include <ios>
#include <ostream>
#include <istream>
#include <fstream>
#include <ext/stdio_filebuf.h>
#include <ext/stdio_sync_filebuf.h>
namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden)
{
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 _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
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_dispatch(&_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.setf(ios_base::unitbuf);
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 455. cerr::tie() and wcerr::tie() are overspecified.
cerr.tie(&cout);
#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.setf(ios_base::unitbuf);
wcerr.tie(&wcout);
#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_dispatch(&_S_refcount, 1);
}
}
ios_base::Init::~Init()
{
// Be race-detector-friendly. For more info see bits/c++config.
_GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_S_refcount);
if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount, -1) == 2)
{
_GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_S_refcount);
// 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;
}
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
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