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jeremybenn |
// Iostreams base classes -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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// 2006, 2007, 2008, 2009
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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//
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// ISO C++ 14882: 27.4 Iostreams base classes
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//
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#include <ios>
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#include <ostream>
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#include <istream>
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#include <fstream>
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#include <ext/stdio_filebuf.h>
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#include <ext/stdio_sync_filebuf.h>
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namespace __gnu_internal _GLIBCXX_VISIBILITY_ATTR(hidden)
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{
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using namespace __gnu_cxx;
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// Extern declarations for global objects in src/globals.cc.
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extern stdio_sync_filebuf<char> buf_cout_sync;
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extern stdio_sync_filebuf<char> buf_cin_sync;
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extern stdio_sync_filebuf<char> buf_cerr_sync;
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extern stdio_filebuf<char> buf_cout;
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extern stdio_filebuf<char> buf_cin;
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extern stdio_filebuf<char> buf_cerr;
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#ifdef _GLIBCXX_USE_WCHAR_T
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extern stdio_sync_filebuf<wchar_t> buf_wcout_sync;
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extern stdio_sync_filebuf<wchar_t> buf_wcin_sync;
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extern stdio_sync_filebuf<wchar_t> buf_wcerr_sync;
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extern stdio_filebuf<wchar_t> buf_wcout;
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extern stdio_filebuf<wchar_t> buf_wcin;
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extern stdio_filebuf<wchar_t> buf_wcerr;
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#endif
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} // namespace __gnu_internal
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_GLIBCXX_BEGIN_NAMESPACE(std)
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using namespace __gnu_internal;
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extern istream cin;
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extern ostream cout;
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extern ostream cerr;
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extern ostream clog;
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#ifdef _GLIBCXX_USE_WCHAR_T
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extern wistream wcin;
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extern wostream wcout;
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extern wostream wcerr;
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extern wostream wclog;
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#endif
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ios_base::Init::Init()
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{
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if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount, 1) == 0)
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{
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// Standard streams default to synced with "C" operations.
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_S_synced_with_stdio = true;
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new (&buf_cout_sync) stdio_sync_filebuf<char>(stdout);
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new (&buf_cin_sync) stdio_sync_filebuf<char>(stdin);
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new (&buf_cerr_sync) stdio_sync_filebuf<char>(stderr);
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// The standard streams are constructed once only and never
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// destroyed.
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new (&cout) ostream(&buf_cout_sync);
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new (&cin) istream(&buf_cin_sync);
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new (&cerr) ostream(&buf_cerr_sync);
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new (&clog) ostream(&buf_cerr_sync);
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cin.tie(&cout);
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cerr.setf(ios_base::unitbuf);
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 455. cerr::tie() and wcerr::tie() are overspecified.
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cerr.tie(&cout);
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#ifdef _GLIBCXX_USE_WCHAR_T
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new (&buf_wcout_sync) stdio_sync_filebuf<wchar_t>(stdout);
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new (&buf_wcin_sync) stdio_sync_filebuf<wchar_t>(stdin);
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new (&buf_wcerr_sync) stdio_sync_filebuf<wchar_t>(stderr);
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new (&wcout) wostream(&buf_wcout_sync);
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new (&wcin) wistream(&buf_wcin_sync);
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new (&wcerr) wostream(&buf_wcerr_sync);
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new (&wclog) wostream(&buf_wcerr_sync);
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wcin.tie(&wcout);
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wcerr.setf(ios_base::unitbuf);
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wcerr.tie(&wcout);
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#endif
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// NB: Have to set refcount above one, so that standard
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// streams are not re-initialized with uses of ios_base::Init
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// besides <iostream> static object, ie just using <ios> with
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// ios_base::Init objects.
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__gnu_cxx::__atomic_add_dispatch(&_S_refcount, 1);
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}
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}
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ios_base::Init::~Init()
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{
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if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount, -1) == 2)
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{
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// Catch any exceptions thrown by basic_ostream::flush()
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__try
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{
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// Flush standard output streams as required by 27.4.2.1.6
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cout.flush();
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cerr.flush();
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clog.flush();
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#ifdef _GLIBCXX_USE_WCHAR_T
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wcout.flush();
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wcerr.flush();
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wclog.flush();
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#endif
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}
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__catch(...)
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{ }
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}
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}
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bool
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ios_base::sync_with_stdio(bool __sync)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 49. Underspecification of ios_base::sync_with_stdio
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bool __ret = ios_base::Init::_S_synced_with_stdio;
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// Turn off sync with C FILE* for cin, cout, cerr, clog iff
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// currently synchronized.
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if (!__sync && __ret)
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{
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// Make sure the standard streams are constructed.
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ios_base::Init __init;
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ios_base::Init::_S_synced_with_stdio = __sync;
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// Explicitly call dtors to free any memory that is
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// dynamically allocated by filebuf ctor or member functions,
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// but don't deallocate all memory by calling operator delete.
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buf_cout_sync.~stdio_sync_filebuf<char>();
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buf_cin_sync.~stdio_sync_filebuf<char>();
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buf_cerr_sync.~stdio_sync_filebuf<char>();
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#ifdef _GLIBCXX_USE_WCHAR_T
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buf_wcout_sync.~stdio_sync_filebuf<wchar_t>();
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buf_wcin_sync.~stdio_sync_filebuf<wchar_t>();
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buf_wcerr_sync.~stdio_sync_filebuf<wchar_t>();
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#endif
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// Create stream buffers for the standard streams and use
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// those buffers without destroying and recreating the
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// streams.
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new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out);
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new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in);
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new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out);
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cout.rdbuf(&buf_cout);
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cin.rdbuf(&buf_cin);
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cerr.rdbuf(&buf_cerr);
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clog.rdbuf(&buf_cerr);
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#ifdef _GLIBCXX_USE_WCHAR_T
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new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out);
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new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in);
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new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out);
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wcout.rdbuf(&buf_wcout);
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wcin.rdbuf(&buf_wcin);
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wcerr.rdbuf(&buf_wcerr);
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wclog.rdbuf(&buf_wcerr);
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#endif
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}
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return __ret;
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}
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_GLIBCXX_END_NAMESPACE
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