| // Iostreams base classes -*- C++ -*- |
| |
| // Copyright (C) 1997-2017 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 |
| // <http://www.gnu.org/licenses/>. |
| |
| // |
| // ISO C++ 14882: 27.4 Iostreams base classes |
| // |
| |
| #include <ios> |
| #include <limits> |
| |
| 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 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; |
| if (__ix > _S_local_word_size - 1) |
| { |
| if (__ix < numeric_limits<int>::max()) |
| { |
| __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) |
| { |
| _M_streambuf_state |= badbit; |
| if (_M_streambuf_state & _M_exception) |
| __throw_ios_failure(__N("ios_base::_M_grow_words " |
| "allocation failed")); |
| if (__iword) |
| _M_word_zero._M_iword = 0; |
| else |
| _M_word_zero._M_pword = 0; |
| return _M_word_zero; |
| } |
| 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; |
| } |
| } |
| else |
| { |
| _M_streambuf_state |= badbit; |
| if (_M_streambuf_state & _M_exception) |
| __throw_ios_failure(__N("ios_base::_M_grow_words is not valid")); |
| 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 |