1*38fd1498Szrj // Iostreams base classes -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj // Copyright (C) 1997-2018 Free Software Foundation, Inc. 4*38fd1498Szrj // 5*38fd1498Szrj // This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj // software; you can redistribute it and/or modify it under the 7*38fd1498Szrj // terms of the GNU General Public License as published by the 8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj // any later version. 10*38fd1498Szrj 11*38fd1498Szrj // This library is distributed in the hope that it will be useful, 12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj // GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj // 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj // You should have received a copy of the GNU General Public License and 21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj // <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj // 26*38fd1498Szrj // ISO C++ 14882: 27.4 Iostreams base classes 27*38fd1498Szrj // 28*38fd1498Szrj 29*38fd1498Szrj #include <ios> 30*38fd1498Szrj #include <limits> 31*38fd1498Szrj 32*38fd1498Szrj namespace std _GLIBCXX_VISIBILITY(default) 33*38fd1498Szrj { 34*38fd1498Szrj _GLIBCXX_BEGIN_NAMESPACE_VERSION 35*38fd1498Szrj 36*38fd1498Szrj // Definitions for static const members of ios_base. 37*38fd1498Szrj const ios_base::fmtflags ios_base::boolalpha; 38*38fd1498Szrj const ios_base::fmtflags ios_base::dec; 39*38fd1498Szrj const ios_base::fmtflags ios_base::fixed; 40*38fd1498Szrj const ios_base::fmtflags ios_base::hex; 41*38fd1498Szrj const ios_base::fmtflags ios_base::internal; 42*38fd1498Szrj const ios_base::fmtflags ios_base::left; 43*38fd1498Szrj const ios_base::fmtflags ios_base::oct; 44*38fd1498Szrj const ios_base::fmtflags ios_base::right; 45*38fd1498Szrj const ios_base::fmtflags ios_base::scientific; 46*38fd1498Szrj const ios_base::fmtflags ios_base::showbase; 47*38fd1498Szrj const ios_base::fmtflags ios_base::showpoint; 48*38fd1498Szrj const ios_base::fmtflags ios_base::showpos; 49*38fd1498Szrj const ios_base::fmtflags ios_base::skipws; 50*38fd1498Szrj const ios_base::fmtflags ios_base::unitbuf; 51*38fd1498Szrj const ios_base::fmtflags ios_base::uppercase; 52*38fd1498Szrj const ios_base::fmtflags ios_base::adjustfield; 53*38fd1498Szrj const ios_base::fmtflags ios_base::basefield; 54*38fd1498Szrj const ios_base::fmtflags ios_base::floatfield; 55*38fd1498Szrj 56*38fd1498Szrj const ios_base::iostate ios_base::badbit; 57*38fd1498Szrj const ios_base::iostate ios_base::eofbit; 58*38fd1498Szrj const ios_base::iostate ios_base::failbit; 59*38fd1498Szrj const ios_base::iostate ios_base::goodbit; 60*38fd1498Szrj 61*38fd1498Szrj const ios_base::openmode ios_base::app; 62*38fd1498Szrj const ios_base::openmode ios_base::ate; 63*38fd1498Szrj const ios_base::openmode ios_base::binary; 64*38fd1498Szrj const ios_base::openmode ios_base::in; 65*38fd1498Szrj const ios_base::openmode ios_base::out; 66*38fd1498Szrj const ios_base::openmode ios_base::trunc; 67*38fd1498Szrj 68*38fd1498Szrj const ios_base::seekdir ios_base::beg; 69*38fd1498Szrj const ios_base::seekdir ios_base::cur; 70*38fd1498Szrj const ios_base::seekdir ios_base::end; 71*38fd1498Szrj 72*38fd1498Szrj _Atomic_word ios_base::Init::_S_refcount; 73*38fd1498Szrj 74*38fd1498Szrj bool ios_base::Init::_S_synced_with_stdio = true; 75*38fd1498Szrj ios_base()76*38fd1498Szrj ios_base::ios_base() throw() 77*38fd1498Szrj : _M_precision(), _M_width(), _M_flags(), _M_exception(), 78*38fd1498Szrj _M_streambuf_state(), _M_callbacks(0), _M_word_zero(), 79*38fd1498Szrj _M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale() 80*38fd1498Szrj { 81*38fd1498Szrj // Do nothing: basic_ios::init() does it. 82*38fd1498Szrj // NB: _M_callbacks and _M_word must be zero for non-initialized 83*38fd1498Szrj // ios_base to go through ~ios_base gracefully. 84*38fd1498Szrj } 85*38fd1498Szrj 86*38fd1498Szrj // 27.4.2.7 ios_base constructors/destructors ~ios_base()87*38fd1498Szrj ios_base::~ios_base() 88*38fd1498Szrj { 89*38fd1498Szrj _M_call_callbacks(erase_event); 90*38fd1498Szrj _M_dispose_callbacks(); 91*38fd1498Szrj if (_M_word != _M_local_word) 92*38fd1498Szrj { 93*38fd1498Szrj delete [] _M_word; 94*38fd1498Szrj _M_word = 0; 95*38fd1498Szrj } 96*38fd1498Szrj } 97*38fd1498Szrj 98*38fd1498Szrj // 27.4.2.5 ios_base storage functions 99*38fd1498Szrj int xalloc()100*38fd1498Szrj ios_base::xalloc() throw() 101*38fd1498Szrj { 102*38fd1498Szrj // Implementation note: Initialize top to zero to ensure that 103*38fd1498Szrj // initialization occurs before main() is started. 104*38fd1498Szrj static _Atomic_word _S_top = 0; 105*38fd1498Szrj return __gnu_cxx::__exchange_and_add_dispatch(&_S_top, 1) + 4; 106*38fd1498Szrj } 107*38fd1498Szrj 108*38fd1498Szrj void register_callback(event_callback __fn,int __index)109*38fd1498Szrj ios_base::register_callback(event_callback __fn, int __index) 110*38fd1498Szrj { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); } 111*38fd1498Szrj 112*38fd1498Szrj // 27.4.2.5 iword/pword storage 113*38fd1498Szrj ios_base::_Words& _M_grow_words(int __ix,bool __iword)114*38fd1498Szrj ios_base::_M_grow_words(int __ix, bool __iword) 115*38fd1498Szrj { 116*38fd1498Szrj // Precondition: _M_word_size <= __ix 117*38fd1498Szrj int __newsize = _S_local_word_size; 118*38fd1498Szrj _Words* __words = _M_local_word; 119*38fd1498Szrj if (__ix > _S_local_word_size - 1) 120*38fd1498Szrj { 121*38fd1498Szrj if (__ix < numeric_limits<int>::max()) 122*38fd1498Szrj { 123*38fd1498Szrj __newsize = __ix + 1; 124*38fd1498Szrj /* We still need to catch bad_alloc even though we use 125*38fd1498Szrj a nothrow new, because the new-expression can throw 126*38fd1498Szrj a bad_array_new_length. */ 127*38fd1498Szrj __try 128*38fd1498Szrj { __words = new (std::nothrow) _Words[__newsize]; } 129*38fd1498Szrj __catch(const std::bad_alloc&) 130*38fd1498Szrj { __words = nullptr; } 131*38fd1498Szrj if (!__words) 132*38fd1498Szrj { 133*38fd1498Szrj _M_streambuf_state |= badbit; 134*38fd1498Szrj if (_M_streambuf_state & _M_exception) 135*38fd1498Szrj __throw_ios_failure(__N("ios_base::_M_grow_words " 136*38fd1498Szrj "allocation failed")); 137*38fd1498Szrj if (__iword) 138*38fd1498Szrj _M_word_zero._M_iword = 0; 139*38fd1498Szrj else 140*38fd1498Szrj _M_word_zero._M_pword = 0; 141*38fd1498Szrj return _M_word_zero; 142*38fd1498Szrj } 143*38fd1498Szrj for (int __i = 0; __i < _M_word_size; __i++) 144*38fd1498Szrj __words[__i] = _M_word[__i]; 145*38fd1498Szrj if (_M_word && _M_word != _M_local_word) 146*38fd1498Szrj { 147*38fd1498Szrj delete [] _M_word; 148*38fd1498Szrj _M_word = 0; 149*38fd1498Szrj } 150*38fd1498Szrj } 151*38fd1498Szrj else 152*38fd1498Szrj { 153*38fd1498Szrj _M_streambuf_state |= badbit; 154*38fd1498Szrj if (_M_streambuf_state & _M_exception) 155*38fd1498Szrj __throw_ios_failure(__N("ios_base::_M_grow_words is not valid")); 156*38fd1498Szrj if (__iword) 157*38fd1498Szrj _M_word_zero._M_iword = 0; 158*38fd1498Szrj else 159*38fd1498Szrj _M_word_zero._M_pword = 0; 160*38fd1498Szrj return _M_word_zero; 161*38fd1498Szrj } 162*38fd1498Szrj } 163*38fd1498Szrj _M_word = __words; 164*38fd1498Szrj _M_word_size = __newsize; 165*38fd1498Szrj return _M_word[__ix]; 166*38fd1498Szrj } 167*38fd1498Szrj 168*38fd1498Szrj void _M_call_callbacks(event __e)169*38fd1498Szrj ios_base::_M_call_callbacks(event __e) throw() 170*38fd1498Szrj { 171*38fd1498Szrj _Callback_list* __p = _M_callbacks; 172*38fd1498Szrj while (__p) 173*38fd1498Szrj { 174*38fd1498Szrj __try 175*38fd1498Szrj { (*__p->_M_fn) (__e, *this, __p->_M_index); } 176*38fd1498Szrj __catch(...) 177*38fd1498Szrj { } 178*38fd1498Szrj __p = __p->_M_next; 179*38fd1498Szrj } 180*38fd1498Szrj } 181*38fd1498Szrj 182*38fd1498Szrj void _M_dispose_callbacks(void)183*38fd1498Szrj ios_base::_M_dispose_callbacks(void) throw() 184*38fd1498Szrj { 185*38fd1498Szrj _Callback_list* __p = _M_callbacks; 186*38fd1498Szrj while (__p && __p->_M_remove_reference() == 0) 187*38fd1498Szrj { 188*38fd1498Szrj _Callback_list* __next = __p->_M_next; 189*38fd1498Szrj delete __p; 190*38fd1498Szrj __p = __next; 191*38fd1498Szrj } 192*38fd1498Szrj _M_callbacks = 0; 193*38fd1498Szrj } 194*38fd1498Szrj 195*38fd1498Szrj void _M_move(ios_base & __rhs)196*38fd1498Szrj ios_base::_M_move(ios_base& __rhs) noexcept 197*38fd1498Szrj { 198*38fd1498Szrj _M_precision = __rhs._M_precision; 199*38fd1498Szrj _M_width = __rhs._M_width; 200*38fd1498Szrj _M_flags = __rhs._M_flags; 201*38fd1498Szrj _M_exception = __rhs._M_exception; 202*38fd1498Szrj _M_streambuf_state = __rhs._M_streambuf_state; 203*38fd1498Szrj _M_callbacks = std::__exchange(__rhs._M_callbacks, nullptr); 204*38fd1498Szrj if (_M_word != _M_local_word) 205*38fd1498Szrj delete[] _M_word; 206*38fd1498Szrj if (__rhs._M_word == __rhs._M_local_word) 207*38fd1498Szrj { 208*38fd1498Szrj _M_word = _M_local_word; 209*38fd1498Szrj _M_word_size = _S_local_word_size; 210*38fd1498Szrj for (int __i = 0; __i < _S_local_word_size; __i++) 211*38fd1498Szrj _M_word[__i] = std::__exchange(__rhs._M_word[__i], {}); 212*38fd1498Szrj } 213*38fd1498Szrj else 214*38fd1498Szrj { 215*38fd1498Szrj _M_word = std::__exchange(__rhs._M_word, __rhs._M_local_word); 216*38fd1498Szrj _M_word_size 217*38fd1498Szrj = std::__exchange(__rhs._M_word_size, _S_local_word_size); 218*38fd1498Szrj } 219*38fd1498Szrj _M_ios_locale = __rhs._M_ios_locale; 220*38fd1498Szrj } 221*38fd1498Szrj 222*38fd1498Szrj void _M_swap(ios_base & __rhs)223*38fd1498Szrj ios_base::_M_swap(ios_base& __rhs) noexcept 224*38fd1498Szrj { 225*38fd1498Szrj std::swap(_M_precision, __rhs._M_precision); 226*38fd1498Szrj std::swap(_M_width, __rhs._M_width); 227*38fd1498Szrj std::swap(_M_flags, __rhs._M_flags); 228*38fd1498Szrj std::swap(_M_exception, __rhs._M_exception); 229*38fd1498Szrj std::swap(_M_streambuf_state, __rhs._M_streambuf_state); 230*38fd1498Szrj std::swap(_M_callbacks, __rhs._M_callbacks); 231*38fd1498Szrj const bool __lhs_local = _M_word == _M_local_word; 232*38fd1498Szrj const bool __rhs_local = __rhs._M_word == __rhs._M_local_word; 233*38fd1498Szrj if (__lhs_local && __rhs_local) 234*38fd1498Szrj std::swap(_M_local_word, __rhs._M_local_word); // array swap 235*38fd1498Szrj else 236*38fd1498Szrj { 237*38fd1498Szrj if (!__lhs_local && !__rhs_local) 238*38fd1498Szrj std::swap(_M_word, __rhs._M_word); 239*38fd1498Szrj else 240*38fd1498Szrj { 241*38fd1498Szrj ios_base* __local; 242*38fd1498Szrj ios_base* __allocated; 243*38fd1498Szrj if (__lhs_local) 244*38fd1498Szrj { 245*38fd1498Szrj __local = this; 246*38fd1498Szrj __allocated = &__rhs; 247*38fd1498Szrj } 248*38fd1498Szrj else 249*38fd1498Szrj { 250*38fd1498Szrj __local = &__rhs; 251*38fd1498Szrj __allocated= this; 252*38fd1498Szrj } 253*38fd1498Szrj for (int __i = 0; __i < _S_local_word_size; __i++) 254*38fd1498Szrj __allocated->_M_local_word[__i] = __local->_M_local_word[__i]; 255*38fd1498Szrj __local->_M_word = __allocated->_M_word; 256*38fd1498Szrj __allocated->_M_word = __allocated->_M_local_word; 257*38fd1498Szrj } 258*38fd1498Szrj std::swap(_M_word_size, __rhs._M_word_size); 259*38fd1498Szrj } 260*38fd1498Szrj std::swap(_M_ios_locale, __rhs._M_ios_locale); 261*38fd1498Szrj } 262*38fd1498Szrj 263*38fd1498Szrj _GLIBCXX_END_NAMESPACE_VERSION 264*38fd1498Szrj } // namespace 265