1 // Iostreams base classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
4 // 2006, 2007, 2008, 2009, 2010, 2011
5 // Free Software Foundation, Inc.
7 // This file is part of the GNU ISO C++ Library. This library is free
8 // software; you can redistribute it and/or modify it under the
9 // terms of the GNU General Public License as published by the
10 // Free Software Foundation; either version 3, or (at your option)
13 // This library is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // Under Section 7 of GPL version 3, you are granted additional
19 // permissions described in the GCC Runtime Library Exception, version
20 // 3.1, as published by the Free Software Foundation.
22 // You should have received a copy of the GNU General Public License and
23 // a copy of the GCC Runtime Library Exception along with this program;
24 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
25 // <http://www.gnu.org/licenses/>.
28 // ISO C++ 14882: 27.4 Iostreams base classes
35 #include <ext/stdio_filebuf.h>
36 #include <ext/stdio_sync_filebuf.h>
38 namespace __gnu_internal
_GLIBCXX_VISIBILITY(hidden
)
40 using namespace __gnu_cxx
;
42 // Extern declarations for global objects in src/globals.cc.
43 extern stdio_sync_filebuf
<char> buf_cout_sync
;
44 extern stdio_sync_filebuf
<char> buf_cin_sync
;
45 extern stdio_sync_filebuf
<char> buf_cerr_sync
;
47 extern stdio_filebuf
<char> buf_cout
;
48 extern stdio_filebuf
<char> buf_cin
;
49 extern stdio_filebuf
<char> buf_cerr
;
51 #ifdef _GLIBCXX_USE_WCHAR_T
52 extern stdio_sync_filebuf
<wchar_t> buf_wcout_sync
;
53 extern stdio_sync_filebuf
<wchar_t> buf_wcin_sync
;
54 extern stdio_sync_filebuf
<wchar_t> buf_wcerr_sync
;
56 extern stdio_filebuf
<wchar_t> buf_wcout
;
57 extern stdio_filebuf
<wchar_t> buf_wcin
;
58 extern stdio_filebuf
<wchar_t> buf_wcerr
;
60 } // namespace __gnu_internal
62 namespace std
_GLIBCXX_VISIBILITY(default)
64 _GLIBCXX_BEGIN_NAMESPACE_VERSION
66 using namespace __gnu_internal
;
73 #ifdef _GLIBCXX_USE_WCHAR_T
75 extern wostream wcout
;
76 extern wostream wcerr
;
77 extern wostream wclog
;
80 ios_base::Init::Init()
82 if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount
, 1) == 0)
84 // Standard streams default to synced with "C" operations.
85 _S_synced_with_stdio
= true;
87 new (&buf_cout_sync
) stdio_sync_filebuf
<char>(stdout
);
88 new (&buf_cin_sync
) stdio_sync_filebuf
<char>(stdin
);
89 new (&buf_cerr_sync
) stdio_sync_filebuf
<char>(stderr
);
91 // The standard streams are constructed once only and never
93 new (&cout
) ostream(&buf_cout_sync
);
94 new (&cin
) istream(&buf_cin_sync
);
95 new (&cerr
) ostream(&buf_cerr_sync
);
96 new (&clog
) ostream(&buf_cerr_sync
);
98 cerr
.setf(ios_base::unitbuf
);
99 // _GLIBCXX_RESOLVE_LIB_DEFECTS
100 // 455. cerr::tie() and wcerr::tie() are overspecified.
103 #ifdef _GLIBCXX_USE_WCHAR_T
104 new (&buf_wcout_sync
) stdio_sync_filebuf
<wchar_t>(stdout
);
105 new (&buf_wcin_sync
) stdio_sync_filebuf
<wchar_t>(stdin
);
106 new (&buf_wcerr_sync
) stdio_sync_filebuf
<wchar_t>(stderr
);
108 new (&wcout
) wostream(&buf_wcout_sync
);
109 new (&wcin
) wistream(&buf_wcin_sync
);
110 new (&wcerr
) wostream(&buf_wcerr_sync
);
111 new (&wclog
) wostream(&buf_wcerr_sync
);
113 wcerr
.setf(ios_base::unitbuf
);
117 // NB: Have to set refcount above one, so that standard
118 // streams are not re-initialized with uses of ios_base::Init
119 // besides <iostream> static object, ie just using <ios> with
120 // ios_base::Init objects.
121 __gnu_cxx::__atomic_add_dispatch(&_S_refcount
, 1);
125 ios_base::Init::~Init()
127 // Be race-detector-friendly. For more info see bits/c++config.
128 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_S_refcount
);
129 if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount
, -1) == 2)
131 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_S_refcount
);
132 // Catch any exceptions thrown by basic_ostream::flush()
135 // Flush standard output streams as required by 27.4.2.1.6
140 #ifdef _GLIBCXX_USE_WCHAR_T
152 ios_base::sync_with_stdio(bool __sync
)
154 // _GLIBCXX_RESOLVE_LIB_DEFECTS
155 // 49. Underspecification of ios_base::sync_with_stdio
156 bool __ret
= ios_base::Init::_S_synced_with_stdio
;
158 // Turn off sync with C FILE* for cin, cout, cerr, clog iff
159 // currently synchronized.
160 if (!__sync
&& __ret
)
162 // Make sure the standard streams are constructed.
163 ios_base::Init __init
;
165 ios_base::Init::_S_synced_with_stdio
= __sync
;
167 // Explicitly call dtors to free any memory that is
168 // dynamically allocated by filebuf ctor or member functions,
169 // but don't deallocate all memory by calling operator delete.
170 buf_cout_sync
.~stdio_sync_filebuf
<char>();
171 buf_cin_sync
.~stdio_sync_filebuf
<char>();
172 buf_cerr_sync
.~stdio_sync_filebuf
<char>();
174 #ifdef _GLIBCXX_USE_WCHAR_T
175 buf_wcout_sync
.~stdio_sync_filebuf
<wchar_t>();
176 buf_wcin_sync
.~stdio_sync_filebuf
<wchar_t>();
177 buf_wcerr_sync
.~stdio_sync_filebuf
<wchar_t>();
180 // Create stream buffers for the standard streams and use
181 // those buffers without destroying and recreating the
183 new (&buf_cout
) stdio_filebuf
<char>(stdout
, ios_base::out
);
184 new (&buf_cin
) stdio_filebuf
<char>(stdin
, ios_base::in
);
185 new (&buf_cerr
) stdio_filebuf
<char>(stderr
, ios_base::out
);
186 cout
.rdbuf(&buf_cout
);
188 cerr
.rdbuf(&buf_cerr
);
189 clog
.rdbuf(&buf_cerr
);
191 #ifdef _GLIBCXX_USE_WCHAR_T
192 new (&buf_wcout
) stdio_filebuf
<wchar_t>(stdout
, ios_base::out
);
193 new (&buf_wcin
) stdio_filebuf
<wchar_t>(stdin
, ios_base::in
);
194 new (&buf_wcerr
) stdio_filebuf
<wchar_t>(stderr
, ios_base::out
);
195 wcout
.rdbuf(&buf_wcout
);
196 wcin
.rdbuf(&buf_wcin
);
197 wcerr
.rdbuf(&buf_wcerr
);
198 wclog
.rdbuf(&buf_wcerr
);
204 _GLIBCXX_END_NAMESPACE_VERSION