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1 // Iostreams base classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001 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 2, 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 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
31 // ISO C++ 14882: 27.4 Iostreams base classes
34 #include <bits/std_ios.h>
35 #include <bits/std_ostream.h>
36 #include <bits/std_istream.h>
37 #include <bits/std_fstream.h>
42 // Definitions for static const data members of __ios_flags.
43 const __ios_flags::__int_type
__ios_flags::_S_boolalpha
;
44 const __ios_flags::__int_type
__ios_flags::_S_dec
;
45 const __ios_flags::__int_type
__ios_flags::_S_fixed
;
46 const __ios_flags::__int_type
__ios_flags::_S_hex
;
47 const __ios_flags::__int_type
__ios_flags::_S_internal
;
48 const __ios_flags::__int_type
__ios_flags::_S_left
;
49 const __ios_flags::__int_type
__ios_flags::_S_oct
;
50 const __ios_flags::__int_type
__ios_flags::_S_right
;
51 const __ios_flags::__int_type
__ios_flags::_S_scientific
;
52 const __ios_flags::__int_type
__ios_flags::_S_showbase
;
53 const __ios_flags::__int_type
__ios_flags::_S_showpoint
;
54 const __ios_flags::__int_type
__ios_flags::_S_showpos
;
55 const __ios_flags::__int_type
__ios_flags::_S_skipws
;
56 const __ios_flags::__int_type
__ios_flags::_S_unitbuf
;
57 const __ios_flags::__int_type
__ios_flags::_S_uppercase
;
58 const __ios_flags::__int_type
__ios_flags::_S_adjustfield
;
59 const __ios_flags::__int_type
__ios_flags::_S_basefield
;
60 const __ios_flags::__int_type
__ios_flags::_S_floatfield
;
62 const __ios_flags::__int_type
__ios_flags::_S_badbit
;
63 const __ios_flags::__int_type
__ios_flags::_S_eofbit
;
64 const __ios_flags::__int_type
__ios_flags::_S_failbit
;
66 const __ios_flags::__int_type
__ios_flags::_S_app
;
67 const __ios_flags::__int_type
__ios_flags::_S_ate
;
68 const __ios_flags::__int_type
__ios_flags::_S_bin
;
69 const __ios_flags::__int_type
__ios_flags::_S_in
;
70 const __ios_flags::__int_type
__ios_flags::_S_out
;
71 const __ios_flags::__int_type
__ios_flags::_S_trunc
;
73 // Definitions for static const members of ios_base.
74 const ios_base::fmtflags
ios_base::boolalpha
;
75 const ios_base::fmtflags
ios_base::dec
;
76 const ios_base::fmtflags
ios_base::fixed
;
77 const ios_base::fmtflags
ios_base::hex
;
78 const ios_base::fmtflags
ios_base::internal
;
79 const ios_base::fmtflags
ios_base::left
;
80 const ios_base::fmtflags
ios_base::oct
;
81 const ios_base::fmtflags
ios_base::right
;
82 const ios_base::fmtflags
ios_base::scientific
;
83 const ios_base::fmtflags
ios_base::showbase
;
84 const ios_base::fmtflags
ios_base::showpoint
;
85 const ios_base::fmtflags
ios_base::showpos
;
86 const ios_base::fmtflags
ios_base::skipws
;
87 const ios_base::fmtflags
ios_base::unitbuf
;
88 const ios_base::fmtflags
ios_base::uppercase
;
89 const ios_base::fmtflags
ios_base::adjustfield
;
90 const ios_base::fmtflags
ios_base::basefield
;
91 const ios_base::fmtflags
ios_base::floatfield
;
93 const ios_base::iostate
ios_base::badbit
;
94 const ios_base::iostate
ios_base::eofbit
;
95 const ios_base::iostate
ios_base::failbit
;
96 const ios_base::iostate
ios_base::goodbit
;
98 const ios_base::openmode
ios_base::app
;
99 const ios_base::openmode
ios_base::ate
;
100 const ios_base::openmode
ios_base::binary
;
101 const ios_base::openmode
ios_base::in
;
102 const ios_base::openmode
ios_base::out
;
103 const ios_base::openmode
ios_base::trunc
;
105 const ios_base::seekdir
ios_base::beg
;
106 const ios_base::seekdir
ios_base::cur
;
107 const ios_base::seekdir
ios_base::end
;
109 const int ios_base::_S_local_words
;
110 int ios_base::Init::_S_ios_base_init
= 0;
111 bool ios_base::Init::_S_synced_with_stdio
= true;
117 #ifdef _GLIBCPP_USE_WCHAR_T
118 extern wistream wcin
;
119 extern wostream wcout
;
120 extern wostream wcerr
;
121 extern wostream wclog
;
124 ios_base::failure::failure(const string
& __str
) throw()
126 strncpy(_M_name
, __str
.c_str(), _M_bufsize
);
127 _M_name
[_M_bufsize
- 1] = '\0';
130 ios_base::failure::~failure() throw()
134 ios_base::failure::what() const throw()
137 ios_base::Init::Init()
139 if (++_S_ios_base_init
== 1)
141 // NB: std_iostream.h creates the four standard files with
142 // NULL buffers. At this point, we swap out these placeholder
143 // objects for the properly-constructed ones
144 _M_cout
= new filebuf(1, "stdout", ios_base::out
);
145 _M_cin
= new filebuf(0, "stdin", ios_base::in
);
146 _M_cerr
= new filebuf(2, "stderr", ios_base::out
);
147 new (&cout
) ostream(_M_cout
);
148 new (&cin
) istream(_M_cin
);
149 new (&cerr
) ostream(_M_cerr
);
150 new (&clog
) ostream(_M_cerr
);
152 cerr
.flags(ios_base::unitbuf
);
154 #ifdef _GLIBCPP_USE_WCHAR_T
155 _M_wcout
= new wfilebuf(1, "stdout", ios_base::out
);
156 _M_wcin
= new wfilebuf(0, "stdin", ios_base::in
);
157 _M_wcerr
= new wfilebuf(2, "stderr", ios_base::out
);
158 new (&wcout
) wostream(_M_wcout
);
159 new (&wcin
) wistream(_M_wcin
);
160 new (&wcerr
) wostream(_M_wcerr
);
161 new (&wclog
) wostream(_M_wcerr
);
163 wcerr
.flags(ios_base::unitbuf
);
165 ios_base::Init::_S_synced_with_stdio
= true;
169 ios_base::Init::~Init()
171 if (--_S_ios_base_init
== 0)
182 #ifdef _GLIBCPP_USE_WCHAR_T
196 // 27.4.2.5 ios_base storage functions
198 ios_base::xalloc() throw()
201 // XXX should be a symbol. (Reserve 0..3 for builtins.)
206 // 27.4.2.5 iword/pword storage
208 ios_base::_M_grow_words(int ix
)
210 // Precondition: _M_word_limit <= ix
211 _Words zero
= { 0, 0 };
212 int newlimit
= _S_local_words
;
213 _Words
* words
= _M_word_array
;
215 if (_S_local_words
<= ix
)
219 { words
= new _Words
[ix
+1]; }
222 _M_dummy
= zero
; // XXX MT? Not on "normal" machines.
223 // XXX now in basic_ios
224 // _M_clear(_M_rdstate() | badbit); // may throw
227 for (; i
< _M_word_limit
; i
++)
228 words
[i
] = _M_words
[i
];
229 if (_M_words
!= _M_word_array
)
233 do { words
[i
] = zero
; } while (++i
< newlimit
);
235 _M_word_limit
= newlimit
;
239 // Called only by basic_ios<>::init.
243 // NB: May be called more than once
246 _M_flags
= skipws
| dec
;
250 _M_ios_locale
= locale();
251 // No init needed for _M_word_array or _M_dummy.
254 // 27.4.2.3 ios_base locale functions
256 ios_base::imbue(const locale
& __loc
)
258 locale __old
= _M_ios_locale
;
259 _M_ios_locale
= __loc
;
260 // Make sure there's a callback for the format caches so they will be
262 _Format_cache
<char>::_S_get(*this);
263 #ifdef _GLIBCPP_USE_WCHAR_T
264 _Format_cache
<wchar_t>::_S_get(*this);
266 _M_call_callbacks(imbue_event
);
272 // Do nothing; init() does it. Static init to 0 makes everything sane.
275 // 27.4.2.7 ios_base constructors/destructors
276 ios_base::~ios_base()
278 _M_call_callbacks(erase_event
);
279 _M_dispose_callbacks();
280 if (_M_words
!= _M_word_array
)
286 ios_base::register_callback(event_callback __fn
, int __index
)
287 { _M_callbacks
= new _Callback_list(__fn
, __index
, _M_callbacks
); }
290 ios_base::_M_call_callbacks(event __e
) throw()
292 for (_Callback_list
* __p
= _M_callbacks
; __p
; __p
= __p
->_M_next
)
295 (*__p
->_M_fn
) (__e
, *this, __p
->_M_index
);
303 ios_base::_M_dispose_callbacks(void)
305 _Callback_list
* __p
= _M_callbacks
;
306 while (__p
&& __p
->_M_remove_reference() == 0)
308 _Callback_list
* __next
= __p
->_M_next
;
316 ios_base::sync_with_stdio(bool __sync
)
318 #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
319 // 49. Underspecification of ios_base::sync_with_stdio
320 bool __ret
= ios_base::Init::_S_synced_with_stdio
;
323 // Turn off sync with C FILE* for cin, cout, cerr, clog iff
324 // currently synchronized.
325 if (!__sync
&& __ret
)
328 // no longer need to do this
329 // Need to dispose of the buffers created at initialization.
330 __ioinit
._M_cout
->~filebuf();
331 __ioinit
._M_cin
->~filebuf();
332 __ioinit
._M_cerr
->~filebuf();
333 __ioinit
._M_cout
= new filebuf();
334 __ioinit
._M_cin
= new filebuf();
335 __ioinit
._M_cerr
= new filebuf();
336 __ioinit
._M_cout
->open("stdout", ios_base::out
);
337 __ioinit
._M_cin
->open("stdin", ios_base::in
);
338 __ioinit
._M_cerr
->open("stderr", ios_base::out
);
339 cout
.rdbuf(__ioinit
._M_cout
);
340 cin
.rdbuf(__ioinit
._M_cin
);
341 cerr
.rdbuf(__ioinit
._M_cerr
);
342 cerr
.flags(ios_base::unitbuf
);
343 clog
.rdbuf(__ioinit
._M_cerr
);
345 #ifdef _GLIBCPP_USE_WCHAR_T
347 ios_base::Init::_S_synced_with_stdio
= false;
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