libstdc++-v3/src/ios.cc

   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
  39 namespace std
  40 {
  41   // Definitions for static const data members of __ios_flags.
  42   const __ios_flags::__int_type __ios_flags::_S_boolalpha;
  43   const __ios_flags::__int_type __ios_flags::_S_dec;
  44   const __ios_flags::__int_type __ios_flags::_S_fixed;
  45   const __ios_flags::__int_type __ios_flags::_S_hex;
  46   const __ios_flags::__int_type __ios_flags::_S_internal;
  47   const __ios_flags::__int_type __ios_flags::_S_left;
  48   const __ios_flags::__int_type __ios_flags::_S_oct;
  49   const __ios_flags::__int_type __ios_flags::_S_right;
  50   const __ios_flags::__int_type __ios_flags::_S_scientific;
  51   const __ios_flags::__int_type __ios_flags::_S_showbase;
  52   const __ios_flags::__int_type __ios_flags::_S_showpoint;
  53   const __ios_flags::__int_type __ios_flags::_S_showpos;
  54   const __ios_flags::__int_type __ios_flags::_S_skipws;
  55   const __ios_flags::__int_type __ios_flags::_S_unitbuf;
  56   const __ios_flags::__int_type __ios_flags::_S_uppercase;
  57   const __ios_flags::__int_type __ios_flags::_S_adjustfield;
  58   const __ios_flags::__int_type __ios_flags::_S_basefield;
  59   const __ios_flags::__int_type __ios_flags::_S_floatfield;
  60
  61   const __ios_flags::__int_type __ios_flags::_S_badbit;
  62   const __ios_flags::__int_type __ios_flags::_S_eofbit;
  63   const __ios_flags::__int_type __ios_flags::_S_failbit;
  64
  65   const __ios_flags::__int_type __ios_flags::_S_app;
  66   const __ios_flags::__int_type __ios_flags::_S_ate;
  67   const __ios_flags::__int_type __ios_flags::_S_bin;
  68   const __ios_flags::__int_type __ios_flags::_S_in;
  69   const __ios_flags::__int_type __ios_flags::_S_out;
  70   const __ios_flags::__int_type __ios_flags::_S_trunc;
  71
  72   // Definitions for static const members of ios_base.
  73   const ios_base::fmtflags ios_base::boolalpha;
  74   const ios_base::fmtflags ios_base::dec;
  75   const ios_base::fmtflags ios_base::fixed;
  76   const ios_base::fmtflags ios_base::hex;
  77   const ios_base::fmtflags ios_base::internal;
  78   const ios_base::fmtflags ios_base::left;
  79   const ios_base::fmtflags ios_base::oct;
  80   const ios_base::fmtflags ios_base::right;
  81   const ios_base::fmtflags ios_base::scientific;
  82   const ios_base::fmtflags ios_base::showbase;
  83   const ios_base::fmtflags ios_base::showpoint;
  84   const ios_base::fmtflags ios_base::showpos;
  85   const ios_base::fmtflags ios_base::skipws;
  86   const ios_base::fmtflags ios_base::unitbuf;
  87   const ios_base::fmtflags ios_base::uppercase;
  88   const ios_base::fmtflags ios_base::adjustfield;
  89   const ios_base::fmtflags ios_base::basefield;
  90   const ios_base::fmtflags ios_base::floatfield;
  91
  92   const ios_base::iostate ios_base::badbit;
  93   const ios_base::iostate ios_base::eofbit;
  94   const ios_base::iostate ios_base::failbit;
  95   const ios_base::iostate ios_base::goodbit;
  96
  97   const ios_base::openmode ios_base::app;
  98   const ios_base::openmode ios_base::ate;
  99   const ios_base::openmode ios_base::binary;
 100   const ios_base::openmode ios_base::in;
 101   const ios_base::openmode ios_base::out;
 102   const ios_base::openmode ios_base::trunc;
 103
 104   const ios_base::seekdir ios_base::beg;
 105   const ios_base::seekdir ios_base::cur;
 106   const ios_base::seekdir ios_base::end;
 107
 108   const int ios_base::_S_local_word_size;
 109
 110   _Atomic_word ios_base::Init::_S_refcount;
 111
 112   bool ios_base::Init::_S_synced_with_stdio = true;
 113
 114   ios_base::ios_base()
 115   : _M_precision(), _M_width(), _M_flags(), _M_exception(),
 116   _M_streambuf_state(), _M_callbacks(0), _M_word_zero(),
 117   _M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale()
 118   {
 119     // Do nothing: basic_ios::init() does it.
 120     // NB: _M_callbacks and _M_word must be zero for non-initialized
 121     // ios_base to go through ~ios_base gracefully.
 122   }
 123
 124   // 27.4.2.7  ios_base constructors/destructors
 125   ios_base::~ios_base()
 126   {
 127     _M_call_callbacks(erase_event);
 128     _M_dispose_callbacks();
 129     if (_M_word != _M_local_word)
 130       {
 131         delete [] _M_word;
 132         _M_word = 0;
 133       }
 134   }
 135
 136   // 27.4.2.5  ios_base storage functions
 137   int
 138   ios_base::xalloc() throw()
 139   {
 140     // Implementation note: Initialize top to zero to ensure that
 141     // initialization occurs before main() is started.
 142     static _Atomic_word _S_top = 0;
 143     return __gnu_cxx::__exchange_and_add(&_S_top, 1) + 4;
 144   }
 145
 146   void
 147   ios_base::register_callback(event_callback __fn, int __index)
 148   { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); }
 149
 150   // 27.4.2.5  iword/pword storage
 151   ios_base::_Words&
 152   ios_base::_M_grow_words(int __ix, bool __iword)
 153   {
 154     // Precondition: _M_word_size <= __ix
 155     int __newsize = _S_local_word_size;
 156     _Words* __words = _M_local_word;
 157     if (__ix > _S_local_word_size - 1)
 158       {
 159         if (__ix < numeric_limits<int>::max())
 160           {
 161             __newsize = __ix + 1;
 162             try
 163               { __words = new _Words[__newsize]; }
 164             catch (...)
 165               {
 166                 _M_streambuf_state |= badbit;
 167                 if (_M_streambuf_state & _M_exception)
 168                   __throw_ios_failure(__N("ios_base::_M_grow_words "
 169                                       "allocation failed"));
 170                 if (__iword)
 171                   _M_word_zero._M_iword = 0;
 172                 else
 173                   _M_word_zero._M_pword = 0;
 174                 return _M_word_zero;
 175               }
 176             for (int __i = 0; __i < _M_word_size; __i++)
 177               __words[__i] = _M_word[__i];
 178             if (_M_word && _M_word != _M_local_word)
 179               {
 180                 delete [] _M_word;
 181                 _M_word = 0;
 182               }
 183           }
 184         else
 185           {
 186             _M_streambuf_state |= badbit;
 187             if (_M_streambuf_state & _M_exception)
 188               __throw_ios_failure(__N("ios_base::_M_grow_words is not valid"));
 189             if (__iword)
 190               _M_word_zero._M_iword = 0;
 191             else
 192               _M_word_zero._M_pword = 0;
 193             return _M_word_zero;
 194           }
 195       }
 196     _M_word = __words;
 197     _M_word_size = __newsize;
 198     return _M_word[__ix];
 199   }
 200
 201   void
 202   ios_base::_M_call_callbacks(event __e) throw()
 203   {
 204     _Callback_list* __p = _M_callbacks;
 205     while (__p)
 206       {
 207         try
 208           { (*__p->_M_fn) (__e, *this, __p->_M_index); }
 209         catch (...)
 210           { }
 211         __p = __p->_M_next;
 212       }
 213   }
 214
 215   void
 216   ios_base::_M_dispose_callbacks(void)
 217   {
 218     _Callback_list* __p = _M_callbacks;
 219     while (__p && __p->_M_remove_reference() == 0)
 220       {
 221         _Callback_list* __next = __p->_M_next;
 222         delete __p;
 223         __p = __next;
 224       }
 225     _M_callbacks = 0;
 226   }
 227 } // namespace std