1 // Iostreams base classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
4 // Free Software Foundation, Inc.
6 // This file is part of the GNU ISO C++ Library. This library is free
7 // software; you can redistribute it and/or modify it under the
8 // terms of the GNU General Public License as published by the
9 // Free Software Foundation; either version 2, or (at your option)
12 // This library is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License along
18 // with this library; see the file COPYING. If not, write to the Free
19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
32 // ISO C++ 14882: 27.4 Iostreams base classes
39 #include <bits/atomicity.h>
40 #include <ext/stdio_filebuf.h>
44 // Extern declarations for global objects in src/globals.cc.
45 extern stdio_filebuf<char> buf_cout;
46 extern stdio_filebuf<char> buf_cin;
47 extern stdio_filebuf<char> buf_cerr;
49 #ifdef _GLIBCPP_USE_WCHAR_T
50 extern stdio_filebuf<wchar_t> buf_wcout;
51 extern stdio_filebuf<wchar_t> buf_wcin;
52 extern stdio_filebuf<wchar_t> buf_wcerr;
54 } // namespace __gnu_cxx
58 using namespace __gnu_cxx;
65 #ifdef _GLIBCPP_USE_WCHAR_T
67 extern wostream wcout;
68 extern wostream wcerr;
69 extern wostream wclog;
72 // Definitions for static const data members of __ios_flags.
73 const __ios_flags::__int_type __ios_flags::_S_boolalpha;
74 const __ios_flags::__int_type __ios_flags::_S_dec;
75 const __ios_flags::__int_type __ios_flags::_S_fixed;
76 const __ios_flags::__int_type __ios_flags::_S_hex;
77 const __ios_flags::__int_type __ios_flags::_S_internal;
78 const __ios_flags::__int_type __ios_flags::_S_left;
79 const __ios_flags::__int_type __ios_flags::_S_oct;
80 const __ios_flags::__int_type __ios_flags::_S_right;
81 const __ios_flags::__int_type __ios_flags::_S_scientific;
82 const __ios_flags::__int_type __ios_flags::_S_showbase;
83 const __ios_flags::__int_type __ios_flags::_S_showpoint;
84 const __ios_flags::__int_type __ios_flags::_S_showpos;
85 const __ios_flags::__int_type __ios_flags::_S_skipws;
86 const __ios_flags::__int_type __ios_flags::_S_unitbuf;
87 const __ios_flags::__int_type __ios_flags::_S_uppercase;
88 const __ios_flags::__int_type __ios_flags::_S_adjustfield;
89 const __ios_flags::__int_type __ios_flags::_S_basefield;
90 const __ios_flags::__int_type __ios_flags::_S_floatfield;
92 const __ios_flags::__int_type __ios_flags::_S_badbit;
93 const __ios_flags::__int_type __ios_flags::_S_eofbit;
94 const __ios_flags::__int_type __ios_flags::_S_failbit;
96 const __ios_flags::__int_type __ios_flags::_S_app;
97 const __ios_flags::__int_type __ios_flags::_S_ate;
98 const __ios_flags::__int_type __ios_flags::_S_bin;
99 const __ios_flags::__int_type __ios_flags::_S_in;
100 const __ios_flags::__int_type __ios_flags::_S_out;
101 const __ios_flags::__int_type __ios_flags::_S_trunc;
103 // Definitions for static const members of ios_base.
104 const ios_base::fmtflags ios_base::boolalpha;
105 const ios_base::fmtflags ios_base::dec;
106 const ios_base::fmtflags ios_base::fixed;
107 const ios_base::fmtflags ios_base::hex;
108 const ios_base::fmtflags ios_base::internal;
109 const ios_base::fmtflags ios_base::left;
110 const ios_base::fmtflags ios_base::oct;
111 const ios_base::fmtflags ios_base::right;
112 const ios_base::fmtflags ios_base::scientific;
113 const ios_base::fmtflags ios_base::showbase;
114 const ios_base::fmtflags ios_base::showpoint;
115 const ios_base::fmtflags ios_base::showpos;
116 const ios_base::fmtflags ios_base::skipws;
117 const ios_base::fmtflags ios_base::unitbuf;
118 const ios_base::fmtflags ios_base::uppercase;
119 const ios_base::fmtflags ios_base::adjustfield;
120 const ios_base::fmtflags ios_base::basefield;
121 const ios_base::fmtflags ios_base::floatfield;
123 const ios_base::iostate ios_base::badbit;
124 const ios_base::iostate ios_base::eofbit;
125 const ios_base::iostate ios_base::failbit;
126 const ios_base::iostate ios_base::goodbit;
128 const ios_base::openmode ios_base::app;
129 const ios_base::openmode ios_base::ate;
130 const ios_base::openmode ios_base::binary;
131 const ios_base::openmode ios_base::in;
132 const ios_base::openmode ios_base::out;
133 const ios_base::openmode ios_base::trunc;
135 const ios_base::seekdir ios_base::beg;
136 const ios_base::seekdir ios_base::cur;
137 const ios_base::seekdir ios_base::end;
139 const int ios_base::_S_local_word_size;
140 int ios_base::Init::_S_ios_base_init = 0;
141 bool ios_base::Init::_S_synced_with_stdio = true;
143 ios_base::failure::failure(const string& __str) throw()
145 strncpy(_M_name, __str.c_str(), _S_bufsize);
146 _M_name[_S_bufsize - 1] = '\0';
149 ios_base::failure::~failure() throw()
153 ios_base::failure::what() const throw()
157 ios_base::Init::_S_create_buffers(bool __sync)
159 size_t __out_size = __sync ? 0 : static_cast<size_t>(BUFSIZ);
160 size_t __in_size = __sync ? 1 : static_cast<size_t>(BUFSIZ);
162 // Create stream buffers for the standard streams and use those
163 // buffers without destroying and recreating the streams.
164 new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out, __out_size);
165 new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in, __in_size);
166 new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out, __out_size);
167 cout.rdbuf(&buf_cout);
169 cerr.rdbuf(&buf_cerr);
170 clog.rdbuf(&buf_cerr);
172 #ifdef _GLIBCPP_USE_WCHAR_T
173 new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out, __out_size);
174 new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in, __in_size);
175 new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out, __out_size);
176 wcout.rdbuf(&buf_wcout);
177 wcin.rdbuf(&buf_wcin);
178 wcerr.rdbuf(&buf_wcerr);
179 wclog.rdbuf(&buf_wcerr);
184 ios_base::Init::_S_destroy_buffers()
186 // Explicitly call dtors to free any memory that is dynamically
187 // allocated by filebuf ctor or member functions, but don't
188 // deallocate all memory by calling operator delete.
189 buf_cout.~stdio_filebuf();
190 buf_cin.~stdio_filebuf();
191 buf_cerr.~stdio_filebuf();
193 #ifdef _GLIBCPP_USE_WCHAR_T
194 buf_wcout.~stdio_filebuf();
195 buf_wcin.~stdio_filebuf();
196 buf_wcerr.~stdio_filebuf();
200 ios_base::Init::Init()
202 if (_S_ios_base_init == 0)
204 // Standard streams default to synced with "C" operations.
205 ios_base::Init::_S_synced_with_stdio = true;
207 // The standard streams are constructed once only and never destroyed.
208 // The stream buffers are set in _S_create_buffers below.
209 new (&cout) ostream(NULL);
210 new (&cin) istream(NULL);
211 new (&cerr) ostream(NULL);
212 new (&clog) ostream(NULL);
214 cerr.flags(ios_base::unitbuf);
216 #ifdef _GLIBCPP_USE_WCHAR_T
217 new (&wcout) wostream(NULL);
218 new (&wcin) wistream(NULL);
219 new (&wcerr) wostream(NULL);
220 new (&wclog) wostream(NULL);
222 wcerr.flags(ios_base::unitbuf);
225 _S_create_buffers(ios_base::Init::_S_synced_with_stdio);
226 _S_ios_base_init = 1;
231 ios_base::Init::~Init()
233 if (--_S_ios_base_init == 1)
235 // Catch any exceptions thrown by basic_ostream::flush()
238 // Flush standard output streams as required by 27.4.2.1.6
243 #ifdef _GLIBCPP_USE_WCHAR_T
254 // 27.4.2.5 ios_base storage functions
256 ios_base::xalloc() throw()
258 // Implementation note: Initialize top to zero to ensure that
259 // initialization occurs before main() is started.
260 static _Atomic_word _S_top = 0;
261 return __exchange_and_add(&_S_top, 1) + 4;
264 // 27.4.2.5 iword/pword storage
266 ios_base::_M_grow_words(int ix)
268 // Precondition: _M_word_size <= ix
269 int newsize = _S_local_word_size;
270 _Words* words = _M_local_word;
271 if (ix > _S_local_word_size - 1)
273 if (ix < numeric_limits<int>::max())
277 { words = new _Words[newsize]; }
280 _M_streambuf_state |= badbit;
281 if (_M_streambuf_state & _M_exception)
282 __throw_ios_failure("ios_base::_M_grow_words "
283 "allocation failed");
286 for (int i = 0; i < _M_word_size; i++)
287 words[i] = _M_word[i];
288 if (_M_word && _M_word != _M_local_word)
296 _M_streambuf_state |= badbit;
297 if (_M_streambuf_state & _M_exception)
298 __throw_ios_failure("ios_base::_M_grow_words ix not valid");
303 _M_word_size = newsize;
307 // Called only by basic_ios<>::init.
311 // NB: May be called more than once
314 _M_flags = skipws | dec;
315 _M_ios_locale = locale();
318 // 27.4.2.3 ios_base locale functions
320 ios_base::imbue(const locale& __loc)
322 locale __old = _M_ios_locale;
323 _M_ios_locale = __loc;
324 _M_call_callbacks(imbue_event);
328 ios_base::ios_base() : _M_callbacks(0), _M_word_size(_S_local_word_size),
329 _M_word(_M_local_word), _M_locale_cache(0)
331 // Do nothing: basic_ios::init() does it.
332 // NB: _M_callbacks and _M_word must be zero for non-initialized
333 // ios_base to go through ~ios_base gracefully.
336 // 27.4.2.7 ios_base constructors/destructors
337 ios_base::~ios_base()
339 _M_call_callbacks(erase_event);
340 _M_dispose_callbacks();
341 if (_M_word != _M_local_word)
349 ios_base::register_callback(event_callback __fn, int __index)
350 { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); }
353 ios_base::_M_call_callbacks(event __e) throw()
355 _Callback_list* __p = _M_callbacks;
359 { (*__p->_M_fn) (__e, *this, __p->_M_index); }
367 ios_base::_M_dispose_callbacks(void)
369 _Callback_list* __p = _M_callbacks;
370 while (__p && __p->_M_remove_reference() == 0)
372 _Callback_list* __next = __p->_M_next;
380 ios_base::sync_with_stdio(bool __sync)
382 #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
383 // 49. Underspecification of ios_base::sync_with_stdio
384 bool __ret = ios_base::Init::_S_synced_with_stdio;
387 // Turn off sync with C FILE* for cin, cout, cerr, clog iff
388 // currently synchronized.
389 if (!__sync && __ret)
391 ios_base::Init::_S_synced_with_stdio = __sync;
392 ios_base::Init::_S_destroy_buffers();
393 ios_base::Init::_S_create_buffers(__sync);