libstdc++-v3/src/ios.cc

   1 // Iostreams base classes -*- C++ -*-
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
   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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  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
  38 _GLIBCXX_BEGIN_NAMESPACE(std)
  39
  40   // Definitions for static const members of ios_base.
  41   const ios_base::fmtflags ios_base::boolalpha;
  42   const ios_base::fmtflags ios_base::dec;
  43   const ios_base::fmtflags ios_base::fixed;
  44   const ios_base::fmtflags ios_base::hex;
  45   const ios_base::fmtflags ios_base::internal;
  46   const ios_base::fmtflags ios_base::left;
  47   const ios_base::fmtflags ios_base::oct;
  48   const ios_base::fmtflags ios_base::right;
  49   const ios_base::fmtflags ios_base::scientific;
  50   const ios_base::fmtflags ios_base::showbase;
  51   const ios_base::fmtflags ios_base::showpoint;
  52   const ios_base::fmtflags ios_base::showpos;
  53   const ios_base::fmtflags ios_base::skipws;
  54   const ios_base::fmtflags ios_base::unitbuf;
  55   const ios_base::fmtflags ios_base::uppercase;
  56   const ios_base::fmtflags ios_base::adjustfield;
  57   const ios_base::fmtflags ios_base::basefield;
  58   const ios_base::fmtflags ios_base::floatfield;
  59
  60   const ios_base::iostate ios_base::badbit;
  61   const ios_base::iostate ios_base::eofbit;
  62   const ios_base::iostate ios_base::failbit;
  63   const ios_base::iostate ios_base::goodbit;
  64
  65   const ios_base::openmode ios_base::app;
  66   const ios_base::openmode ios_base::ate;
  67   const ios_base::openmode ios_base::binary;
  68   const ios_base::openmode ios_base::in;
  69   const ios_base::openmode ios_base::out;
  70   const ios_base::openmode ios_base::trunc;
  71
  72   const ios_base::seekdir ios_base::beg;
  73   const ios_base::seekdir ios_base::cur;
  74   const ios_base::seekdir ios_base::end;
  75
  76   _Atomic_word ios_base::Init::_S_refcount;
  77
  78   bool ios_base::Init::_S_synced_with_stdio = true;
  79
  80   ios_base::ios_base()
  81   : _M_precision(), _M_width(), _M_flags(), _M_exception(),
  82   _M_streambuf_state(), _M_callbacks(0), _M_word_zero(),
  83   _M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale()
  84   {
  85     // Do nothing: basic_ios::init() does it.
  86     // NB: _M_callbacks and _M_word must be zero for non-initialized
  87     // ios_base to go through ~ios_base gracefully.
  88   }
  89
  90   // 27.4.2.7  ios_base constructors/destructors
  91   ios_base::~ios_base()
  92   {
  93     _M_call_callbacks(erase_event);
  94     _M_dispose_callbacks();
  95     if (_M_word != _M_local_word)
  96       {
  97         delete [] _M_word;
  98         _M_word = 0;
  99       }
 100   }
 101
 102   // 27.4.2.5  ios_base storage functions
 103   int
 104   ios_base::xalloc() throw()
 105   {
 106     // Implementation note: Initialize top to zero to ensure that
 107     // initialization occurs before main() is started.
 108     static _Atomic_word _S_top = 0;
 109     return __gnu_cxx::__exchange_and_add_dispatch(&_S_top, 1) + 4;
 110   }
 111
 112   void
 113   ios_base::register_callback(event_callback __fn, int __index)
 114   { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); }
 115
 116   // 27.4.2.5  iword/pword storage
 117   ios_base::_Words&
 118   ios_base::_M_grow_words(int __ix, bool __iword)
 119   {
 120     // Precondition: _M_word_size <= __ix
 121     int __newsize = _S_local_word_size;
 122     _Words* __words = _M_local_word;
 123     if (__ix > _S_local_word_size - 1)
 124       {
 125         if (__ix < numeric_limits<int>::max())
 126           {
 127             __newsize = __ix + 1;
 128             try
 129               { __words = new _Words[__newsize]; }
 130             catch(...)
 131               {
 132                 _M_streambuf_state |= badbit;
 133                 if (_M_streambuf_state & _M_exception)
 134                   __throw_ios_failure(__N("ios_base::_M_grow_words "
 135                                       "allocation failed"));
 136                 if (__iword)
 137                   _M_word_zero._M_iword = 0;
 138                 else
 139                   _M_word_zero._M_pword = 0;
 140                 return _M_word_zero;
 141               }
 142             for (int __i = 0; __i < _M_word_size; __i++)
 143               __words[__i] = _M_word[__i];
 144             if (_M_word && _M_word != _M_local_word)
 145               {
 146                 delete [] _M_word;
 147                 _M_word = 0;
 148               }
 149           }
 150         else
 151           {
 152             _M_streambuf_state |= badbit;
 153             if (_M_streambuf_state & _M_exception)
 154               __throw_ios_failure(__N("ios_base::_M_grow_words is not valid"));
 155             if (__iword)
 156               _M_word_zero._M_iword = 0;
 157             else
 158               _M_word_zero._M_pword = 0;
 159             return _M_word_zero;
 160           }
 161       }
 162     _M_word = __words;
 163     _M_word_size = __newsize;
 164     return _M_word[__ix];
 165   }
 166
 167   void
 168   ios_base::_M_call_callbacks(event __e) throw()
 169   {
 170     _Callback_list* __p = _M_callbacks;
 171     while (__p)
 172       {
 173         try
 174           { (*__p->_M_fn) (__e, *this, __p->_M_index); }
 175         catch(...)
 176           { }
 177         __p = __p->_M_next;
 178       }
 179   }
 180
 181   void
 182   ios_base::_M_dispose_callbacks(void)
 183   {
 184     _Callback_list* __p = _M_callbacks;
 185     while (__p && __p->_M_remove_reference() == 0)
 186       {
 187         _Callback_list* __next = __p->_M_next;
 188         delete __p;
 189         __p = __next;
 190       }
 191     _M_callbacks = 0;
 192   }
 193
 194 _GLIBCXX_END_NAMESPACE