1// Iostreams base classes -*- C++ -*- 2 3// Copyright (C) 1997-2015 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 3, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// Under Section 7 of GPL version 3, you are granted additional 17// permissions described in the GCC Runtime Library Exception, version 18// 3.1, as published by the Free Software Foundation. 19 20// You should have received a copy of the GNU General Public License and 21// a copy of the GCC Runtime Library Exception along with this program; 22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23// <http://www.gnu.org/licenses/>. 24 25// 26// ISO C++ 14882: 27.4 Iostreams base classes 27// 28 29#include <ios> 30#include <limits> 31 32namespace std _GLIBCXX_VISIBILITY(default) 33{ 34_GLIBCXX_BEGIN_NAMESPACE_VERSION 35 36 // Definitions for static const members of ios_base. 37 const ios_base::fmtflags ios_base::boolalpha; 38 const ios_base::fmtflags ios_base::dec; 39 const ios_base::fmtflags ios_base::fixed; 40 const ios_base::fmtflags ios_base::hex; 41 const ios_base::fmtflags ios_base::internal; 42 const ios_base::fmtflags ios_base::left; 43 const ios_base::fmtflags ios_base::oct; 44 const ios_base::fmtflags ios_base::right; 45 const ios_base::fmtflags ios_base::scientific; 46 const ios_base::fmtflags ios_base::showbase; 47 const ios_base::fmtflags ios_base::showpoint; 48 const ios_base::fmtflags ios_base::showpos; 49 const ios_base::fmtflags ios_base::skipws; 50 const ios_base::fmtflags ios_base::unitbuf; 51 const ios_base::fmtflags ios_base::uppercase; 52 const ios_base::fmtflags ios_base::adjustfield; 53 const ios_base::fmtflags ios_base::basefield; 54 const ios_base::fmtflags ios_base::floatfield; 55 56 const ios_base::iostate ios_base::badbit; 57 const ios_base::iostate ios_base::eofbit; 58 const ios_base::iostate ios_base::failbit; 59 const ios_base::iostate ios_base::goodbit; 60 61 const ios_base::openmode ios_base::app; 62 const ios_base::openmode ios_base::ate; 63 const ios_base::openmode ios_base::binary; 64 const ios_base::openmode ios_base::in; 65 const ios_base::openmode ios_base::out; 66 const ios_base::openmode ios_base::trunc; 67 68 const ios_base::seekdir ios_base::beg; 69 const ios_base::seekdir ios_base::cur; 70 const ios_base::seekdir ios_base::end; 71 72 _Atomic_word ios_base::Init::_S_refcount; 73 74 bool ios_base::Init::_S_synced_with_stdio = true; 75 76 ios_base::ios_base() throw() 77 : _M_precision(), _M_width(), _M_flags(), _M_exception(), 78 _M_streambuf_state(), _M_callbacks(0), _M_word_zero(), 79 _M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale() 80 { 81 // Do nothing: basic_ios::init() does it. 82 // NB: _M_callbacks and _M_word must be zero for non-initialized 83 // ios_base to go through ~ios_base gracefully. 84 } 85 86 // 27.4.2.7 ios_base constructors/destructors 87 ios_base::~ios_base() 88 { 89 _M_call_callbacks(erase_event); 90 _M_dispose_callbacks(); 91 if (_M_word != _M_local_word) 92 { 93 delete [] _M_word; 94 _M_word = 0; 95 } 96 } 97 98 // 27.4.2.5 ios_base storage functions 99 int 100 ios_base::xalloc() throw() 101 { 102 // Implementation note: Initialize top to zero to ensure that 103 // initialization occurs before main() is started. 104 static _Atomic_word _S_top = 0; 105 return __gnu_cxx::__exchange_and_add_dispatch(&_S_top, 1) + 4; 106 } 107 108 void 109 ios_base::register_callback(event_callback __fn, int __index) 110 { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); } 111 112 // 27.4.2.5 iword/pword storage 113 ios_base::_Words& 114 ios_base::_M_grow_words(int __ix, bool __iword) 115 { 116 // Precondition: _M_word_size <= __ix 117 int __newsize = _S_local_word_size; 118 _Words* __words = _M_local_word; 119 if (__ix > _S_local_word_size - 1) 120 { 121 if (__ix < numeric_limits<int>::max()) 122 { 123 __newsize = __ix + 1; 124 __try 125 { __words = new _Words[__newsize]; } 126 __catch(const std::bad_alloc&) 127 { 128 _M_streambuf_state |= badbit; 129 if (_M_streambuf_state & _M_exception) 130 __throw_ios_failure(__N("ios_base::_M_grow_words " 131 "allocation failed")); 132 if (__iword) 133 _M_word_zero._M_iword = 0; 134 else 135 _M_word_zero._M_pword = 0; 136 return _M_word_zero; 137 } 138 for (int __i = 0; __i < _M_word_size; __i++) 139 __words[__i] = _M_word[__i]; 140 if (_M_word && _M_word != _M_local_word) 141 { 142 delete [] _M_word; 143 _M_word = 0; 144 } 145 } 146 else 147 { 148 _M_streambuf_state |= badbit; 149 if (_M_streambuf_state & _M_exception) 150 __throw_ios_failure(__N("ios_base::_M_grow_words is not valid")); 151 if (__iword) 152 _M_word_zero._M_iword = 0; 153 else 154 _M_word_zero._M_pword = 0; 155 return _M_word_zero; 156 } 157 } 158 _M_word = __words; 159 _M_word_size = __newsize; 160 return _M_word[__ix]; 161 } 162 163 void 164 ios_base::_M_call_callbacks(event __e) throw() 165 { 166 _Callback_list* __p = _M_callbacks; 167 while (__p) 168 { 169 __try 170 { (*__p->_M_fn) (__e, *this, __p->_M_index); } 171 __catch(...) 172 { } 173 __p = __p->_M_next; 174 } 175 } 176 177 void 178 ios_base::_M_dispose_callbacks(void) throw() 179 { 180 _Callback_list* __p = _M_callbacks; 181 while (__p && __p->_M_remove_reference() == 0) 182 { 183 _Callback_list* __next = __p->_M_next; 184 delete __p; 185 __p = __next; 186 } 187 _M_callbacks = 0; 188 } 189 190 void 191 ios_base::_M_move(ios_base& __rhs) noexcept 192 { 193 _M_precision = __rhs._M_precision; 194 _M_width = __rhs._M_width; 195 _M_flags = __rhs._M_flags; 196 _M_exception = __rhs._M_exception; 197 _M_streambuf_state = __rhs._M_streambuf_state; 198 _M_callbacks = std::__exchange(__rhs._M_callbacks, nullptr); 199 if (_M_word != _M_local_word) 200 delete[] _M_word; 201 if (__rhs._M_word == __rhs._M_local_word) 202 { 203 _M_word = _M_local_word; 204 _M_word_size = _S_local_word_size; 205 for (int __i = 0; __i < _S_local_word_size; __i++) 206 _M_word[__i] = std::__exchange(__rhs._M_word[__i], {}); 207 } 208 else 209 { 210 _M_word = std::__exchange(__rhs._M_word, __rhs._M_local_word); 211 _M_word_size 212 = std::__exchange(__rhs._M_word_size, _S_local_word_size); 213 } 214 _M_ios_locale = __rhs._M_ios_locale; 215 } 216 217 void 218 ios_base::_M_swap(ios_base& __rhs) noexcept 219 { 220 std::swap(_M_precision, __rhs._M_precision); 221 std::swap(_M_width, __rhs._M_width); 222 std::swap(_M_flags, __rhs._M_flags); 223 std::swap(_M_exception, __rhs._M_exception); 224 std::swap(_M_streambuf_state, __rhs._M_streambuf_state); 225 std::swap(_M_callbacks, __rhs._M_callbacks); 226 const bool __lhs_local = _M_word == _M_local_word; 227 const bool __rhs_local = __rhs._M_word == __rhs._M_local_word; 228 if (__lhs_local && __rhs_local) 229 std::swap(_M_local_word, __rhs._M_local_word); // array swap 230 else 231 { 232 if (!__lhs_local && !__rhs_local) 233 std::swap(_M_word, __rhs._M_word); 234 else 235 { 236 ios_base* __local; 237 ios_base* __allocated; 238 if (__lhs_local) 239 { 240 __local = this; 241 __allocated = &__rhs; 242 } 243 else 244 { 245 __local = &__rhs; 246 __allocated= this; 247 } 248 for (int __i = 0; __i < _S_local_word_size; __i++) 249 __allocated->_M_local_word[__i] = __local->_M_local_word[__i]; 250 __local->_M_word = __allocated->_M_word; 251 __allocated->_M_word = __allocated->_M_local_word; 252 } 253 std::swap(_M_word_size, __rhs._M_word_size); 254 } 255 std::swap(_M_ios_locale, __rhs._M_ios_locale); 256 } 257 258_GLIBCXX_END_NAMESPACE_VERSION 259} // namespace 260