// Iostreams base classes -*- C++ -*- // Copyright (C) 1997-2022 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // . // // ISO C++ 14882: 27.4 Iostreams base classes // #include #include namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION // Definitions for static const members of ios_base. const ios_base::fmtflags ios_base::boolalpha; const ios_base::fmtflags ios_base::dec; const ios_base::fmtflags ios_base::fixed; const ios_base::fmtflags ios_base::hex; const ios_base::fmtflags ios_base::internal; const ios_base::fmtflags ios_base::left; const ios_base::fmtflags ios_base::oct; const ios_base::fmtflags ios_base::right; const ios_base::fmtflags ios_base::scientific; const ios_base::fmtflags ios_base::showbase; const ios_base::fmtflags ios_base::showpoint; const ios_base::fmtflags ios_base::showpos; const ios_base::fmtflags ios_base::skipws; const ios_base::fmtflags ios_base::unitbuf; const ios_base::fmtflags ios_base::uppercase; const ios_base::fmtflags ios_base::adjustfield; const ios_base::fmtflags ios_base::basefield; const ios_base::fmtflags ios_base::floatfield; const ios_base::iostate ios_base::badbit; const ios_base::iostate ios_base::eofbit; const ios_base::iostate ios_base::failbit; const ios_base::iostate ios_base::goodbit; const ios_base::openmode ios_base::app; const ios_base::openmode ios_base::ate; const ios_base::openmode ios_base::binary; const ios_base::openmode ios_base::in; const ios_base::openmode ios_base::out; const ios_base::openmode ios_base::trunc; const ios_base::seekdir ios_base::beg; const ios_base::seekdir ios_base::cur; const ios_base::seekdir ios_base::end; _Atomic_word ios_base::Init::_S_refcount; bool ios_base::Init::_S_synced_with_stdio = true; ios_base::ios_base() throw() : _M_precision(), _M_width(), _M_flags(), _M_exception(), _M_streambuf_state(), _M_callbacks(0), _M_word_zero(), _M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale() { // Do nothing: basic_ios::init() does it. // NB: _M_callbacks and _M_word must be zero for non-initialized // ios_base to go through ~ios_base gracefully. } // 27.4.2.7 ios_base constructors/destructors ios_base::~ios_base() { _M_call_callbacks(erase_event); _M_dispose_callbacks(); if (_M_word != _M_local_word) { delete [] _M_word; _M_word = 0; } } // 27.4.2.5 ios_base storage functions int ios_base::xalloc() throw() { // Implementation note: Initialize top to zero to ensure that // initialization occurs before main() is started. static _Atomic_word _S_top = 0; return __gnu_cxx::__exchange_and_add_dispatch(&_S_top, 1) + 4; } void ios_base::register_callback(event_callback __fn, int __index) { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); } // 27.4.2.5 [ios.base.storage] iword/pword storage ios_base::_Words& ios_base::_M_grow_words(int __ix, bool __iword) { // Precondition: _M_word_size <= __ix int __newsize = _S_local_word_size; _Words* __words = _M_local_word; const char* __error = nullptr; if ((unsigned)__ix >= (unsigned)numeric_limits::max()) __error = __N("ios_base::_M_grow_words is not valid"); else if (__ix > _S_local_word_size - 1) { __newsize = __ix + 1; /* We still need to catch bad_alloc even though we use a nothrow new, because the new-expression can throw a bad_array_new_length. */ __try { __words = new (std::nothrow) _Words[__newsize]; } __catch(const std::bad_alloc&) { __words = nullptr; } if (!__words) __error = __N("ios_base::_M_grow_words allocation failed"); else { for (int __i = 0; __i < _M_word_size; __i++) __words[__i] = _M_word[__i]; if (_M_word && _M_word != _M_local_word) { delete [] _M_word; _M_word = 0; } } } if (__error) { _M_streambuf_state |= badbit; if (_M_streambuf_state & _M_exception) __throw_ios_failure(__error); if (__iword) _M_word_zero._M_iword = 0; else _M_word_zero._M_pword = 0; return _M_word_zero; } _M_word = __words; _M_word_size = __newsize; return _M_word[__ix]; } void ios_base::_M_call_callbacks(event __e) throw() { _Callback_list* __p = _M_callbacks; while (__p) { __try { (*__p->_M_fn) (__e, *this, __p->_M_index); } __catch(...) { } __p = __p->_M_next; } } void ios_base::_M_dispose_callbacks(void) throw() { _Callback_list* __p = _M_callbacks; while (__p && __p->_M_remove_reference() == 0) { _Callback_list* __next = __p->_M_next; delete __p; __p = __next; } _M_callbacks = 0; } void ios_base::_M_move(ios_base& __rhs) noexcept { _M_precision = __rhs._M_precision; _M_width = __rhs._M_width; _M_flags = __rhs._M_flags; _M_exception = __rhs._M_exception; _M_streambuf_state = __rhs._M_streambuf_state; _M_callbacks = std::__exchange(__rhs._M_callbacks, nullptr); if (_M_word != _M_local_word) delete[] _M_word; if (__rhs._M_word == __rhs._M_local_word) { _M_word = _M_local_word; _M_word_size = _S_local_word_size; for (int __i = 0; __i < _S_local_word_size; __i++) _M_word[__i] = std::__exchange(__rhs._M_word[__i], {}); } else { _M_word = std::__exchange(__rhs._M_word, __rhs._M_local_word); _M_word_size = std::__exchange(__rhs._M_word_size, _S_local_word_size); } _M_ios_locale = __rhs._M_ios_locale; } void ios_base::_M_swap(ios_base& __rhs) noexcept { std::swap(_M_precision, __rhs._M_precision); std::swap(_M_width, __rhs._M_width); std::swap(_M_flags, __rhs._M_flags); std::swap(_M_exception, __rhs._M_exception); std::swap(_M_streambuf_state, __rhs._M_streambuf_state); std::swap(_M_callbacks, __rhs._M_callbacks); const bool __lhs_local = _M_word == _M_local_word; const bool __rhs_local = __rhs._M_word == __rhs._M_local_word; if (__lhs_local && __rhs_local) std::swap(_M_local_word, __rhs._M_local_word); // array swap else { if (!__lhs_local && !__rhs_local) std::swap(_M_word, __rhs._M_word); else { ios_base* __local; ios_base* __allocated; if (__lhs_local) { __local = this; __allocated = &__rhs; } else { __local = &__rhs; __allocated= this; } for (int __i = 0; __i < _S_local_word_size; __i++) __allocated->_M_local_word[__i] = __local->_M_local_word[__i]; __local->_M_word = __allocated->_M_word; __allocated->_M_word = __allocated->_M_local_word; } std::swap(_M_word_size, __rhs._M_word_size); } std::swap(_M_ios_locale, __rhs._M_ios_locale); } _GLIBCXX_END_NAMESPACE_VERSION } // namespace