| // Iostreams base classes -*- C++ -*- |
| |
| // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
| // 2006, 2007, 2008, 2009 |
| // 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_ATTR(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 |
| |
| _GLIBCXX_BEGIN_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_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.flags(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.flags(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() |
| { |
| if (__gnu_cxx::__exchange_and_add_dispatch(&_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; |
| } |
| |
| _GLIBCXX_END_NAMESPACE |