1 // Iostreams base classes -*- C++ -*-
3 // Copyright (C) 1997-2013 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
26 // ISO C++ 14882: 27.4 Iostreams base classes
33 #include <ext/stdio_filebuf.h>
34 #include <ext/stdio_sync_filebuf.h>
36 namespace __gnu_internal
_GLIBCXX_VISIBILITY(hidden
)
38 using namespace __gnu_cxx
;
40 // Extern declarations for global objects in src/globals.cc.
41 extern stdio_sync_filebuf
<char> buf_cout_sync
;
42 extern stdio_sync_filebuf
<char> buf_cin_sync
;
43 extern stdio_sync_filebuf
<char> buf_cerr_sync
;
45 extern stdio_filebuf
<char> buf_cout
;
46 extern stdio_filebuf
<char> buf_cin
;
47 extern stdio_filebuf
<char> buf_cerr
;
49 #ifdef _GLIBCXX_USE_WCHAR_T
50 extern stdio_sync_filebuf
<wchar_t> buf_wcout_sync
;
51 extern stdio_sync_filebuf
<wchar_t> buf_wcin_sync
;
52 extern stdio_sync_filebuf
<wchar_t> buf_wcerr_sync
;
54 extern stdio_filebuf
<wchar_t> buf_wcout
;
55 extern stdio_filebuf
<wchar_t> buf_wcin
;
56 extern stdio_filebuf
<wchar_t> buf_wcerr
;
58 } // namespace __gnu_internal
60 namespace std
_GLIBCXX_VISIBILITY(default)
62 _GLIBCXX_BEGIN_NAMESPACE_VERSION
64 using namespace __gnu_internal
;
71 #ifdef _GLIBCXX_USE_WCHAR_T
73 extern wostream wcout
;
74 extern wostream wcerr
;
75 extern wostream wclog
;
78 ios_base::Init::Init()
80 if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount
, 1) == 0)
82 // Standard streams default to synced with "C" operations.
83 _S_synced_with_stdio
= true;
85 new (&buf_cout_sync
) stdio_sync_filebuf
<char>(stdout
);
86 new (&buf_cin_sync
) stdio_sync_filebuf
<char>(stdin
);
87 new (&buf_cerr_sync
) stdio_sync_filebuf
<char>(stderr
);
89 // The standard streams are constructed once only and never
91 new (&cout
) ostream(&buf_cout_sync
);
92 new (&cin
) istream(&buf_cin_sync
);
93 new (&cerr
) ostream(&buf_cerr_sync
);
94 new (&clog
) ostream(&buf_cerr_sync
);
96 cerr
.setf(ios_base::unitbuf
);
97 // _GLIBCXX_RESOLVE_LIB_DEFECTS
98 // 455. cerr::tie() and wcerr::tie() are overspecified.
101 #ifdef _GLIBCXX_USE_WCHAR_T
102 new (&buf_wcout_sync
) stdio_sync_filebuf
<wchar_t>(stdout
);
103 new (&buf_wcin_sync
) stdio_sync_filebuf
<wchar_t>(stdin
);
104 new (&buf_wcerr_sync
) stdio_sync_filebuf
<wchar_t>(stderr
);
106 new (&wcout
) wostream(&buf_wcout_sync
);
107 new (&wcin
) wistream(&buf_wcin_sync
);
108 new (&wcerr
) wostream(&buf_wcerr_sync
);
109 new (&wclog
) wostream(&buf_wcerr_sync
);
111 wcerr
.setf(ios_base::unitbuf
);
115 // NB: Have to set refcount above one, so that standard
116 // streams are not re-initialized with uses of ios_base::Init
117 // besides <iostream> static object, ie just using <ios> with
118 // ios_base::Init objects.
119 __gnu_cxx::__atomic_add_dispatch(&_S_refcount
, 1);
123 ios_base::Init::~Init()
125 // Be race-detector-friendly. For more info see bits/c++config.
126 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_S_refcount
);
127 if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount
, -1) == 2)
129 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_S_refcount
);
130 // Catch any exceptions thrown by basic_ostream::flush()
133 // Flush standard output streams as required by 27.4.2.1.6
138 #ifdef _GLIBCXX_USE_WCHAR_T
150 ios_base::sync_with_stdio(bool __sync
)
152 // _GLIBCXX_RESOLVE_LIB_DEFECTS
153 // 49. Underspecification of ios_base::sync_with_stdio
154 bool __ret
= ios_base::Init::_S_synced_with_stdio
;
156 // Turn off sync with C FILE* for cin, cout, cerr, clog iff
157 // currently synchronized.
158 if (!__sync
&& __ret
)
160 // Make sure the standard streams are constructed.
161 ios_base::Init __init
;
163 ios_base::Init::_S_synced_with_stdio
= __sync
;
165 // Explicitly call dtors to free any memory that is
166 // dynamically allocated by filebuf ctor or member functions,
167 // but don't deallocate all memory by calling operator delete.
168 buf_cout_sync
.~stdio_sync_filebuf
<char>();
169 buf_cin_sync
.~stdio_sync_filebuf
<char>();
170 buf_cerr_sync
.~stdio_sync_filebuf
<char>();
172 #ifdef _GLIBCXX_USE_WCHAR_T
173 buf_wcout_sync
.~stdio_sync_filebuf
<wchar_t>();
174 buf_wcin_sync
.~stdio_sync_filebuf
<wchar_t>();
175 buf_wcerr_sync
.~stdio_sync_filebuf
<wchar_t>();
178 // Create stream buffers for the standard streams and use
179 // those buffers without destroying and recreating the
181 new (&buf_cout
) stdio_filebuf
<char>(stdout
, ios_base::out
);
182 new (&buf_cin
) stdio_filebuf
<char>(stdin
, ios_base::in
);
183 new (&buf_cerr
) stdio_filebuf
<char>(stderr
, ios_base::out
);
184 cout
.rdbuf(&buf_cout
);
186 cerr
.rdbuf(&buf_cerr
);
187 clog
.rdbuf(&buf_cerr
);
189 #ifdef _GLIBCXX_USE_WCHAR_T
190 new (&buf_wcout
) stdio_filebuf
<wchar_t>(stdout
, ios_base::out
);
191 new (&buf_wcin
) stdio_filebuf
<wchar_t>(stdin
, ios_base::in
);
192 new (&buf_wcerr
) stdio_filebuf
<wchar_t>(stderr
, ios_base::out
);
193 wcout
.rdbuf(&buf_wcout
);
194 wcin
.rdbuf(&buf_wcin
);
195 wcerr
.rdbuf(&buf_wcerr
);
196 wclog
.rdbuf(&buf_wcerr
);
202 _GLIBCXX_END_NAMESPACE_VERSION