ios.cc revision 146897 
1// Iostreams base classes -*- C++ -*-
2
3// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
4// Free Software Foundation, Inc.
5//
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)
10// any later version.
11
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.
16
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,
20// USA.
21
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.
30
31//
32// ISO C++ 14882: 27.4  Iostreams base classes
33//
34
35#include <ios>
36#include <limits>
37#include <bits/atomicity.h>
38
39namespace std
40{
41  // XXX GLIBCXX_ABI Deprecated
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;
61
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;
65
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;
72
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;
92
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;
97
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;
104
105  const ios_base::seekdir ios_base::beg;
106  const ios_base::seekdir ios_base::cur;
107  const ios_base::seekdir ios_base::end;
108
109  const int ios_base::_S_local_word_size;
110
111  _Atomic_word ios_base::Init::_S_refcount;
112
113  bool ios_base::Init::_S_synced_with_stdio = true;
114
115  ios_base::ios_base()
116  : _M_precision(), _M_width(), _M_flags(), _M_exception(),
117  _M_streambuf_state(), _M_callbacks(0), _M_word_zero(),
118  _M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale()
119  {
120    // Do nothing: basic_ios::init() does it.
121    // NB: _M_callbacks and _M_word must be zero for non-initialized
122    // ios_base to go through ~ios_base gracefully.
123  }
124
125  // 27.4.2.7  ios_base constructors/destructors
126  ios_base::~ios_base()
127  {
128    _M_call_callbacks(erase_event);
129    _M_dispose_callbacks();
130    if (_M_word != _M_local_word)
131      {
132	delete [] _M_word;
133	_M_word = 0;
134      }
135  }
136
137  // 27.4.2.5  ios_base storage functions
138  int
139  ios_base::xalloc() throw()
140  {
141    // Implementation note: Initialize top to zero to ensure that
142    // initialization occurs before main() is started.
143    static _Atomic_word _S_top = 0;
144    return __gnu_cxx::__exchange_and_add(&_S_top, 1) + 4;
145  }
146
147  void
148  ios_base::register_callback(event_callback __fn, int __index)
149  { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); }
150
151  // 27.4.2.5  iword/pword storage
152  ios_base::_Words&
153  ios_base::_M_grow_words(int ix, bool iword)
154  {
155    // Precondition: _M_word_size <= ix
156    int newsize = _S_local_word_size;
157    _Words* words = _M_local_word;
158    if (ix > _S_local_word_size - 1)
159      {
160	if (ix < numeric_limits<int>::max())
161	  {
162	    newsize = ix + 1;
163	    try
164	      { words = new _Words[newsize]; }
165	    catch (...)
166	      {
167		_M_streambuf_state |= badbit;
168		if (_M_streambuf_state & _M_exception)
169		  __throw_ios_failure(__N("ios_base::_M_grow_words "
170				      "allocation failed"));
171		if (iword)
172		  _M_word_zero._M_iword = 0;
173		else
174		  _M_word_zero._M_pword = 0;
175		return _M_word_zero;
176	      }
177	    for (int i = 0; i < _M_word_size; i++)
178	      words[i] = _M_word[i];
179	    if (_M_word && _M_word != _M_local_word)
180	      {
181		delete [] _M_word;
182		_M_word = 0;
183	      }
184	  }
185	else
186	  {
187	    _M_streambuf_state |= badbit;
188	    if (_M_streambuf_state & _M_exception)
189	      __throw_ios_failure(__N("ios_base::_M_grow_words is not valid"));
190	    if (iword)
191	      _M_word_zero._M_iword = 0;
192	    else
193	      _M_word_zero._M_pword = 0;
194	    return _M_word_zero;
195	  }
196      }
197    _M_word = words;
198    _M_word_size = newsize;
199    return _M_word[ix];
200  }
201
202  void
203  ios_base::_M_call_callbacks(event __e) throw()
204  {
205    _Callback_list* __p = _M_callbacks;
206    while (__p)
207      {
208	try
209	  { (*__p->_M_fn) (__e, *this, __p->_M_index); }
210	catch (...)
211	  { }
212	__p = __p->_M_next;
213      }
214  }
215
216  void
217  ios_base::_M_dispose_callbacks(void)
218  {
219    _Callback_list* __p = _M_callbacks;
220    while (__p && __p->_M_remove_reference() == 0)
221      {
222	_Callback_list* __next = __p->_M_next;
223	delete __p;
224	__p = __next;
225      }
226    _M_callbacks = 0;
227  }
228} // namespace std
229