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   // 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