ios_init.cc

00001 // Iostreams base classes -*- C++ -*- 00002 00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 2, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // You should have received a copy of the GNU General Public License along 00018 // with this library; see the file COPYING. If not, write to the Free 00019 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00020 // USA. 00021 00022 // As a special exception, you may use this file as part of a free software 00023 // library without restriction. Specifically, if other files instantiate 00024 // templates or use macros or inline functions from this file, or you compile 00025 // this file and link it with other files to produce an executable, this 00026 // file does not by itself cause the resulting executable to be covered by 00027 // the GNU General Public License. This exception does not however 00028 // invalidate any other reasons why the executable file might be covered by 00029 // the GNU General Public License. 00030 00031 // 00032 // ISO C++ 14882: 27.4 Iostreams base classes 00033 // 00034 00035 #include <ios> 00036 #include <ostream> 00037 #include <istream> 00038 #include <fstream> 00039 #include <bits/atomicity.h> 00040 #include <ext/stdio_filebuf.h> 00041 #include <ext/stdio_sync_filebuf.h> 00042 00043 namespace __gnu_internal 00044 { 00045 using namespace __gnu_cxx; 00046 00047 // Extern declarations for global objects in src/globals.cc. 00048 extern stdio_sync_filebuf<char> buf_cout_sync; 00049 extern stdio_sync_filebuf<char> buf_cin_sync; 00050 extern stdio_sync_filebuf<char> buf_cerr_sync; 00051 00052 extern stdio_filebuf<char> buf_cout; 00053 extern stdio_filebuf<char> buf_cin; 00054 extern stdio_filebuf<char> buf_cerr; 00055 00056 #ifdef _GLIBCXX_USE_WCHAR_T 00057 extern stdio_sync_filebuf<wchar_t> buf_wcout_sync; 00058 extern stdio_sync_filebuf<wchar_t> buf_wcin_sync; 00059 extern stdio_sync_filebuf<wchar_t> buf_wcerr_sync; 00060 00061 extern stdio_filebuf<wchar_t> buf_wcout; 00062 extern stdio_filebuf<wchar_t> buf_wcin; 00063 extern stdio_filebuf<wchar_t> buf_wcerr; 00064 #endif 00065 } // namespace __gnu_internal 00066 00067 namespace std 00068 { 00069 using namespace __gnu_internal; 00070 00071 extern istream cin; 00072 extern ostream cout; 00073 extern ostream cerr; 00074 extern ostream clog; 00075 00076 #ifdef _GLIBCXX_USE_WCHAR_T 00077 extern wistream wcin; 00078 extern wostream wcout; 00079 extern wostream wcerr; 00080 extern wostream wclog; 00081 #endif 00082 00083 ios_base::Init::Init() 00084 { 00085 if (__gnu_cxx::__exchange_and_add(&_S_refcount, 1) == 0) 00086 { 00087 // Standard streams default to synced with "C" operations. 00088 _S_synced_with_stdio = true; 00089 00090 new (&buf_cout_sync) stdio_sync_filebuf<char>(stdout); 00091 new (&buf_cin_sync) stdio_sync_filebuf<char>(stdin); 00092 new (&buf_cerr_sync) stdio_sync_filebuf<char>(stderr); 00093 00094 // The standard streams are constructed once only and never 00095 // destroyed. 00096 new (&cout) ostream(&buf_cout_sync); 00097 new (&cin) istream(&buf_cin_sync); 00098 new (&cerr) ostream(&buf_cerr_sync); 00099 new (&clog) ostream(&buf_cerr_sync); 00100 cin.tie(&cout); 00101 cerr.flags(ios_base::unitbuf); 00102 00103 #ifdef _GLIBCXX_USE_WCHAR_T 00104 new (&buf_wcout_sync) stdio_sync_filebuf<wchar_t>(stdout); 00105 new (&buf_wcin_sync) stdio_sync_filebuf<wchar_t>(stdin); 00106 new (&buf_wcerr_sync) stdio_sync_filebuf<wchar_t>(stderr); 00107 00108 new (&wcout) wostream(&buf_wcout_sync); 00109 new (&wcin) wistream(&buf_wcin_sync); 00110 new (&wcerr) wostream(&buf_wcerr_sync); 00111 new (&wclog) wostream(&buf_wcerr_sync); 00112 wcin.tie(&wcout); 00113 wcerr.flags(ios_base::unitbuf); 00114 #endif 00115 00116 // NB: Have to set refcount above one, so that standard 00117 // streams are not re-initialized with uses of ios_base::Init 00118 // besides <iostream> static object, ie just using <ios> with 00119 // ios_base::Init objects. 00120 __gnu_cxx::__atomic_add(&_S_refcount, 1); 00121 } 00122 } 00123 00124 ios_base::Init::~Init() 00125 { 00126 if (__gnu_cxx::__exchange_and_add(&_S_refcount, -1) == 2) 00127 { 00128 // Catch any exceptions thrown by basic_ostream::flush() 00129 try 00130 { 00131 // Flush standard output streams as required by 27.4.2.1.6 00132 cout.flush(); 00133 cerr.flush(); 00134 clog.flush(); 00135 00136 #ifdef _GLIBCXX_USE_WCHAR_T 00137 wcout.flush(); 00138 wcerr.flush(); 00139 wclog.flush(); 00140 #endif 00141 } 00142 catch (...) 00143 { } 00144 } 00145 } 00146 00147 bool 00148 ios_base::sync_with_stdio(bool __sync) 00149 { 00150 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00151 // 49. Underspecification of ios_base::sync_with_stdio 00152 bool __ret = ios_base::Init::_S_synced_with_stdio; 00153 00154 // Turn off sync with C FILE* for cin, cout, cerr, clog iff 00155 // currently synchronized. 00156 if (!__sync && __ret) 00157 { 00158 ios_base::Init::_S_synced_with_stdio = __sync; 00159 00160 // Explicitly call dtors to free any memory that is 00161 // dynamically allocated by filebuf ctor or member functions, 00162 // but don't deallocate all memory by calling operator delete. 00163 buf_cout_sync.~stdio_sync_filebuf<char>(); 00164 buf_cin_sync.~stdio_sync_filebuf<char>(); 00165 buf_cerr_sync.~stdio_sync_filebuf<char>(); 00166 00167 #ifdef _GLIBCXX_USE_WCHAR_T 00168 buf_wcout_sync.~stdio_sync_filebuf<wchar_t>(); 00169 buf_wcin_sync.~stdio_sync_filebuf<wchar_t>(); 00170 buf_wcerr_sync.~stdio_sync_filebuf<wchar_t>(); 00171 #endif 00172 00173 // Create stream buffers for the standard streams and use 00174 // those buffers without destroying and recreating the 00175 // streams. 00176 new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out); 00177 new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in); 00178 new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out); 00179 cout.rdbuf(&buf_cout); 00180 cin.rdbuf(&buf_cin); 00181 cerr.rdbuf(&buf_cerr); 00182 clog.rdbuf(&buf_cerr); 00183 00184 #ifdef _GLIBCXX_USE_WCHAR_T 00185 new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out); 00186 new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in); 00187 new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out); 00188 wcout.rdbuf(&buf_wcout); 00189 wcin.rdbuf(&buf_wcin); 00190 wcerr.rdbuf(&buf_wcerr); 00191 wclog.rdbuf(&buf_wcerr); 00192 #endif 00193 } 00194 return __ret; 00195 } 00196 } // namespace std

Generated on Wed Jun 9 11:18:35 2004 for libstdc++-v3 Source by doxygen 1.3.7