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 ios_base()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 ~ios_base()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 xalloc()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 register_callback(event_callback __fn,int __index)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& _M_grow_words(int __ix,bool __iword)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 _M_call_callbacks(event __e)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 _M_dispose_callbacks(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 195