// Iostreams base classes -*- C++ -*- // Copyright (C) 1997-2014 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 // . // // ISO C++ 14882: 27.4 Iostreams base classes // #include #include #include #include #include #include namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden) { using namespace __gnu_cxx; // Extern declarations for global objects in src/c++98/globals.cc. extern stdio_sync_filebuf buf_cout_sync; extern stdio_sync_filebuf buf_cin_sync; extern stdio_sync_filebuf buf_cerr_sync; extern stdio_filebuf buf_cout; extern stdio_filebuf buf_cin; extern stdio_filebuf buf_cerr; #ifdef _GLIBCXX_USE_WCHAR_T extern stdio_sync_filebuf buf_wcout_sync; extern stdio_sync_filebuf buf_wcin_sync; extern stdio_sync_filebuf buf_wcerr_sync; extern stdio_filebuf buf_wcout; extern stdio_filebuf buf_wcin; extern stdio_filebuf 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(stdout); new (&buf_cin_sync) stdio_sync_filebuf(stdin); new (&buf_cerr_sync) stdio_sync_filebuf(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(stdout); new (&buf_wcin_sync) stdio_sync_filebuf(stdin); new (&buf_wcerr_sync) stdio_sync_filebuf(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 static object, ie just using 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(); buf_cin_sync.~stdio_sync_filebuf(); buf_cerr_sync.~stdio_sync_filebuf(); #ifdef _GLIBCXX_USE_WCHAR_T buf_wcout_sync.~stdio_sync_filebuf(); buf_wcin_sync.~stdio_sync_filebuf(); buf_wcerr_sync.~stdio_sync_filebuf(); #endif // Create stream buffers for the standard streams and use // those buffers without destroying and recreating the // streams. new (&buf_cout) stdio_filebuf(stdout, ios_base::out); new (&buf_cin) stdio_filebuf(stdin, ios_base::in); new (&buf_cerr) stdio_filebuf(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(stdout, ios_base::out); new (&buf_wcin) stdio_filebuf(stdin, ios_base::in); new (&buf_wcerr) stdio_filebuf(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