1*404b540aSrobert // Iostreams base classes -*- C++ -*- 2*404b540aSrobert 3*404b540aSrobert // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 4*404b540aSrobert // Free Software Foundation, Inc. 5*404b540aSrobert // 6*404b540aSrobert // This file is part of the GNU ISO C++ Library. This library is free 7*404b540aSrobert // software; you can redistribute it and/or modify it under the 8*404b540aSrobert // terms of the GNU General Public License as published by the 9*404b540aSrobert // Free Software Foundation; either version 2, or (at your option) 10*404b540aSrobert // any later version. 11*404b540aSrobert 12*404b540aSrobert // This library is distributed in the hope that it will be useful, 13*404b540aSrobert // but WITHOUT ANY WARRANTY; without even the implied warranty of 14*404b540aSrobert // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15*404b540aSrobert // GNU General Public License for more details. 16*404b540aSrobert 17*404b540aSrobert // You should have received a copy of the GNU General Public License along 18*404b540aSrobert // with this library; see the file COPYING. If not, write to the Free 19*404b540aSrobert // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20*404b540aSrobert // USA. 21*404b540aSrobert 22*404b540aSrobert // As a special exception, you may use this file as part of a free software 23*404b540aSrobert // library without restriction. Specifically, if other files instantiate 24*404b540aSrobert // templates or use macros or inline functions from this file, or you compile 25*404b540aSrobert // this file and link it with other files to produce an executable, this 26*404b540aSrobert // file does not by itself cause the resulting executable to be covered by 27*404b540aSrobert // the GNU General Public License. This exception does not however 28*404b540aSrobert // invalidate any other reasons why the executable file might be covered by 29*404b540aSrobert // the GNU General Public License. 30*404b540aSrobert 31*404b540aSrobert // 32*404b540aSrobert // ISO C++ 14882: 27.4 Iostreams base classes 33*404b540aSrobert // 34*404b540aSrobert 35*404b540aSrobert #include <ios> 36*404b540aSrobert #include <ostream> 37*404b540aSrobert #include <istream> 38*404b540aSrobert #include <fstream> 39*404b540aSrobert #include <ext/stdio_filebuf.h> 40*404b540aSrobert #include <ext/stdio_sync_filebuf.h> 41*404b540aSrobert 42*404b540aSrobert namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden) 43*404b540aSrobert { 44*404b540aSrobert using namespace __gnu_cxx; 45*404b540aSrobert 46*404b540aSrobert // Extern declarations for global objects in src/globals.cc. 47*404b540aSrobert extern stdio_sync_filebuf<char> buf_cout_sync; 48*404b540aSrobert extern stdio_sync_filebuf<char> buf_cin_sync; 49*404b540aSrobert extern stdio_sync_filebuf<char> buf_cerr_sync; 50*404b540aSrobert 51*404b540aSrobert extern stdio_filebuf<char> buf_cout; 52*404b540aSrobert extern stdio_filebuf<char> buf_cin; 53*404b540aSrobert extern stdio_filebuf<char> buf_cerr; 54*404b540aSrobert 55*404b540aSrobert #ifdef _GLIBCXX_USE_WCHAR_T 56*404b540aSrobert extern stdio_sync_filebuf<wchar_t> buf_wcout_sync; 57*404b540aSrobert extern stdio_sync_filebuf<wchar_t> buf_wcin_sync; 58*404b540aSrobert extern stdio_sync_filebuf<wchar_t> buf_wcerr_sync; 59*404b540aSrobert 60*404b540aSrobert extern stdio_filebuf<wchar_t> buf_wcout; 61*404b540aSrobert extern stdio_filebuf<wchar_t> buf_wcin; 62*404b540aSrobert extern stdio_filebuf<wchar_t> buf_wcerr; 63*404b540aSrobert #endif 64*404b540aSrobert } // namespace __gnu_internal 65*404b540aSrobert 66*404b540aSrobert _GLIBCXX_BEGIN_NAMESPACE(std) 67*404b540aSrobert 68*404b540aSrobert using namespace __gnu_internal; 69*404b540aSrobert 70*404b540aSrobert extern istream cin; 71*404b540aSrobert extern ostream cout; 72*404b540aSrobert extern ostream cerr; 73*404b540aSrobert extern ostream clog; 74*404b540aSrobert 75*404b540aSrobert #ifdef _GLIBCXX_USE_WCHAR_T 76*404b540aSrobert extern wistream wcin; 77*404b540aSrobert extern wostream wcout; 78*404b540aSrobert extern wostream wcerr; 79*404b540aSrobert extern wostream wclog; 80*404b540aSrobert #endif 81*404b540aSrobert Init()82*404b540aSrobert ios_base::Init::Init() 83*404b540aSrobert { 84*404b540aSrobert if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount, 1) == 0) 85*404b540aSrobert { 86*404b540aSrobert // Standard streams default to synced with "C" operations. 87*404b540aSrobert _S_synced_with_stdio = true; 88*404b540aSrobert 89*404b540aSrobert new (&buf_cout_sync) stdio_sync_filebuf<char>(stdout); 90*404b540aSrobert new (&buf_cin_sync) stdio_sync_filebuf<char>(stdin); 91*404b540aSrobert new (&buf_cerr_sync) stdio_sync_filebuf<char>(stderr); 92*404b540aSrobert 93*404b540aSrobert // The standard streams are constructed once only and never 94*404b540aSrobert // destroyed. 95*404b540aSrobert new (&cout) ostream(&buf_cout_sync); 96*404b540aSrobert new (&cin) istream(&buf_cin_sync); 97*404b540aSrobert new (&cerr) ostream(&buf_cerr_sync); 98*404b540aSrobert new (&clog) ostream(&buf_cerr_sync); 99*404b540aSrobert cin.tie(&cout); 100*404b540aSrobert cerr.flags(ios_base::unitbuf); 101*404b540aSrobert // _GLIBCXX_RESOLVE_LIB_DEFECTS 102*404b540aSrobert // 455. cerr::tie() and wcerr::tie() are overspecified. 103*404b540aSrobert cerr.tie(&cout); 104*404b540aSrobert 105*404b540aSrobert #ifdef _GLIBCXX_USE_WCHAR_T 106*404b540aSrobert new (&buf_wcout_sync) stdio_sync_filebuf<wchar_t>(stdout); 107*404b540aSrobert new (&buf_wcin_sync) stdio_sync_filebuf<wchar_t>(stdin); 108*404b540aSrobert new (&buf_wcerr_sync) stdio_sync_filebuf<wchar_t>(stderr); 109*404b540aSrobert 110*404b540aSrobert new (&wcout) wostream(&buf_wcout_sync); 111*404b540aSrobert new (&wcin) wistream(&buf_wcin_sync); 112*404b540aSrobert new (&wcerr) wostream(&buf_wcerr_sync); 113*404b540aSrobert new (&wclog) wostream(&buf_wcerr_sync); 114*404b540aSrobert wcin.tie(&wcout); 115*404b540aSrobert wcerr.flags(ios_base::unitbuf); 116*404b540aSrobert wcerr.tie(&wcout); 117*404b540aSrobert #endif 118*404b540aSrobert 119*404b540aSrobert // NB: Have to set refcount above one, so that standard 120*404b540aSrobert // streams are not re-initialized with uses of ios_base::Init 121*404b540aSrobert // besides <iostream> static object, ie just using <ios> with 122*404b540aSrobert // ios_base::Init objects. 123*404b540aSrobert __gnu_cxx::__atomic_add_dispatch(&_S_refcount, 1); 124*404b540aSrobert } 125*404b540aSrobert } 126*404b540aSrobert ~Init()127*404b540aSrobert ios_base::Init::~Init() 128*404b540aSrobert { 129*404b540aSrobert if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount, -1) == 2) 130*404b540aSrobert { 131*404b540aSrobert // Catch any exceptions thrown by basic_ostream::flush() 132*404b540aSrobert try 133*404b540aSrobert { 134*404b540aSrobert // Flush standard output streams as required by 27.4.2.1.6 135*404b540aSrobert cout.flush(); 136*404b540aSrobert cerr.flush(); 137*404b540aSrobert clog.flush(); 138*404b540aSrobert 139*404b540aSrobert #ifdef _GLIBCXX_USE_WCHAR_T 140*404b540aSrobert wcout.flush(); 141*404b540aSrobert wcerr.flush(); 142*404b540aSrobert wclog.flush(); 143*404b540aSrobert #endif 144*404b540aSrobert } 145*404b540aSrobert catch (...) 146*404b540aSrobert { } 147*404b540aSrobert } 148*404b540aSrobert } 149*404b540aSrobert 150*404b540aSrobert bool sync_with_stdio(bool __sync)151*404b540aSrobert ios_base::sync_with_stdio(bool __sync) 152*404b540aSrobert { 153*404b540aSrobert // _GLIBCXX_RESOLVE_LIB_DEFECTS 154*404b540aSrobert // 49. Underspecification of ios_base::sync_with_stdio 155*404b540aSrobert bool __ret = ios_base::Init::_S_synced_with_stdio; 156*404b540aSrobert 157*404b540aSrobert // Turn off sync with C FILE* for cin, cout, cerr, clog iff 158*404b540aSrobert // currently synchronized. 159*404b540aSrobert if (!__sync && __ret) 160*404b540aSrobert { 161*404b540aSrobert // Make sure the standard streams are constructed. 162*404b540aSrobert ios_base::Init __init; 163*404b540aSrobert 164*404b540aSrobert ios_base::Init::_S_synced_with_stdio = __sync; 165*404b540aSrobert 166*404b540aSrobert // Explicitly call dtors to free any memory that is 167*404b540aSrobert // dynamically allocated by filebuf ctor or member functions, 168*404b540aSrobert // but don't deallocate all memory by calling operator delete. 169*404b540aSrobert buf_cout_sync.~stdio_sync_filebuf<char>(); 170*404b540aSrobert buf_cin_sync.~stdio_sync_filebuf<char>(); 171*404b540aSrobert buf_cerr_sync.~stdio_sync_filebuf<char>(); 172*404b540aSrobert 173*404b540aSrobert #ifdef _GLIBCXX_USE_WCHAR_T 174*404b540aSrobert buf_wcout_sync.~stdio_sync_filebuf<wchar_t>(); 175*404b540aSrobert buf_wcin_sync.~stdio_sync_filebuf<wchar_t>(); 176*404b540aSrobert buf_wcerr_sync.~stdio_sync_filebuf<wchar_t>(); 177*404b540aSrobert #endif 178*404b540aSrobert 179*404b540aSrobert // Create stream buffers for the standard streams and use 180*404b540aSrobert // those buffers without destroying and recreating the 181*404b540aSrobert // streams. 182*404b540aSrobert new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out); 183*404b540aSrobert new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in); 184*404b540aSrobert new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out); 185*404b540aSrobert cout.rdbuf(&buf_cout); 186*404b540aSrobert cin.rdbuf(&buf_cin); 187*404b540aSrobert cerr.rdbuf(&buf_cerr); 188*404b540aSrobert clog.rdbuf(&buf_cerr); 189*404b540aSrobert 190*404b540aSrobert #ifdef _GLIBCXX_USE_WCHAR_T 191*404b540aSrobert new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out); 192*404b540aSrobert new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in); 193*404b540aSrobert new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out); 194*404b540aSrobert wcout.rdbuf(&buf_wcout); 195*404b540aSrobert wcin.rdbuf(&buf_wcin); 196*404b540aSrobert wcerr.rdbuf(&buf_wcerr); 197*404b540aSrobert wclog.rdbuf(&buf_wcerr); 198*404b540aSrobert #endif 199*404b540aSrobert } 200*404b540aSrobert return __ret; 201*404b540aSrobert } 202*404b540aSrobert 203*404b540aSrobert _GLIBCXX_END_NAMESPACE 204