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1// Iostreams base classes -*- C++ -*-
2
bc2631e0 3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
12ffa228 4// 2006, 2007, 2008, 2009, 2010, 2011
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5// Free Software Foundation, Inc.
6//
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
748086b7 10// Free Software Foundation; either version 3, or (at your option)
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11// any later version.
12
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.
17
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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.
21
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/>.
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26
27//
28// ISO C++ 14882: 27.4 Iostreams base classes
29//
30
31#include <ios>
32#include <ostream>
33#include <istream>
34#include <fstream>
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35#include <ext/stdio_filebuf.h>
36#include <ext/stdio_sync_filebuf.h>
37
12ffa228 38namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden)
c755e77d 39{
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40 using namespace __gnu_cxx;
41
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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;
46
47 extern stdio_filebuf<char> buf_cout;
48 extern stdio_filebuf<char> buf_cin;
49 extern stdio_filebuf<char> buf_cerr;
50
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;
55
56 extern stdio_filebuf<wchar_t> buf_wcout;
57 extern stdio_filebuf<wchar_t> buf_wcin;
58 extern stdio_filebuf<wchar_t> buf_wcerr;
59#endif
ff4cf05b 60} // namespace __gnu_internal
c755e77d 61
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62namespace std _GLIBCXX_VISIBILITY(default)
63{
64_GLIBCXX_BEGIN_NAMESPACE_VERSION
3cbc7af0 65
ff4cf05b 66 using namespace __gnu_internal;
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67
68 extern istream cin;
69 extern ostream cout;
70 extern ostream cerr;
71 extern ostream clog;
72
73#ifdef _GLIBCXX_USE_WCHAR_T
74 extern wistream wcin;
75 extern wostream wcout;
76 extern wostream wcerr;
77 extern wostream wclog;
78#endif
79
80 ios_base::Init::Init()
81 {
b7ee72de 82 if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount, 1) == 0)
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83 {
84 // Standard streams default to synced with "C" operations.
85 _S_synced_with_stdio = true;
86
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);
90
91 // The standard streams are constructed once only and never
92 // destroyed.
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);
97 cin.tie(&cout);
af0b8d73 98 cerr.setf(ios_base::unitbuf);
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99 // _GLIBCXX_RESOLVE_LIB_DEFECTS
100 // 455. cerr::tie() and wcerr::tie() are overspecified.
101 cerr.tie(&cout);
102
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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);
107
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);
112 wcin.tie(&wcout);
af0b8d73 113 wcerr.setf(ios_base::unitbuf);
634a11f7 114 wcerr.tie(&wcout);
c755e77d 115#endif
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116
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.
b7ee72de 121 __gnu_cxx::__atomic_add_dispatch(&_S_refcount, 1);
c755e77d 122 }
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123 }
124
125 ios_base::Init::~Init()
126 {
be335b18 127 // Be race-detector-friendly. For more info see bits/c++config.
8c61f400 128 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_S_refcount);
b7ee72de 129 if (__gnu_cxx::__exchange_and_add_dispatch(&_S_refcount, -1) == 2)
c755e77d 130 {
8c61f400 131 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_S_refcount);
c755e77d 132 // Catch any exceptions thrown by basic_ostream::flush()
bc2631e0 133 __try
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134 {
135 // Flush standard output streams as required by 27.4.2.1.6
136 cout.flush();
137 cerr.flush();
138 clog.flush();
139
140#ifdef _GLIBCXX_USE_WCHAR_T
141 wcout.flush();
142 wcerr.flush();
143 wclog.flush();
144#endif
145 }
bc2631e0 146 __catch(...)
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147 { }
148 }
149 }
150
151 bool
152 ios_base::sync_with_stdio(bool __sync)
153 {
154 // _GLIBCXX_RESOLVE_LIB_DEFECTS
155 // 49. Underspecification of ios_base::sync_with_stdio
156 bool __ret = ios_base::Init::_S_synced_with_stdio;
157
158 // Turn off sync with C FILE* for cin, cout, cerr, clog iff
159 // currently synchronized.
160 if (!__sync && __ret)
161 {
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162 // Make sure the standard streams are constructed.
163 ios_base::Init __init;
164
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165 ios_base::Init::_S_synced_with_stdio = __sync;
166
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>();
173
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>();
178#endif
179
180 // Create stream buffers for the standard streams and use
181 // those buffers without destroying and recreating the
182 // streams.
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);
187 cin.rdbuf(&buf_cin);
188 cerr.rdbuf(&buf_cerr);
189 clog.rdbuf(&buf_cerr);
190
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);
199#endif
200 }
201 return __ret;
202 }
3cbc7af0 203
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204_GLIBCXX_END_NAMESPACE_VERSION
205} // namespace