mirror of git://gcc.gnu.org/git/gcc.git
258 lines
7.7 KiB
C++
258 lines
7.7 KiB
C++
// Iostreams base classes -*- C++ -*-
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// Copyright (C) 1997-2018 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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//
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// ISO C++ 14882: 27.4 Iostreams base classes
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//
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#include <ios>
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#include <limits>
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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// Definitions for static const members of ios_base.
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const ios_base::fmtflags ios_base::boolalpha;
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const ios_base::fmtflags ios_base::dec;
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const ios_base::fmtflags ios_base::fixed;
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const ios_base::fmtflags ios_base::hex;
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const ios_base::fmtflags ios_base::internal;
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const ios_base::fmtflags ios_base::left;
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const ios_base::fmtflags ios_base::oct;
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const ios_base::fmtflags ios_base::right;
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const ios_base::fmtflags ios_base::scientific;
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const ios_base::fmtflags ios_base::showbase;
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const ios_base::fmtflags ios_base::showpoint;
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const ios_base::fmtflags ios_base::showpos;
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const ios_base::fmtflags ios_base::skipws;
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const ios_base::fmtflags ios_base::unitbuf;
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const ios_base::fmtflags ios_base::uppercase;
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const ios_base::fmtflags ios_base::adjustfield;
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const ios_base::fmtflags ios_base::basefield;
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const ios_base::fmtflags ios_base::floatfield;
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const ios_base::iostate ios_base::badbit;
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const ios_base::iostate ios_base::eofbit;
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const ios_base::iostate ios_base::failbit;
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const ios_base::iostate ios_base::goodbit;
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const ios_base::openmode ios_base::app;
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const ios_base::openmode ios_base::ate;
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const ios_base::openmode ios_base::binary;
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const ios_base::openmode ios_base::in;
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const ios_base::openmode ios_base::out;
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const ios_base::openmode ios_base::trunc;
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const ios_base::seekdir ios_base::beg;
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const ios_base::seekdir ios_base::cur;
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const ios_base::seekdir ios_base::end;
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_Atomic_word ios_base::Init::_S_refcount;
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bool ios_base::Init::_S_synced_with_stdio = true;
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ios_base::ios_base() throw()
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: _M_precision(), _M_width(), _M_flags(), _M_exception(),
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_M_streambuf_state(), _M_callbacks(0), _M_word_zero(),
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_M_word_size(_S_local_word_size), _M_word(_M_local_word), _M_ios_locale()
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{
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// Do nothing: basic_ios::init() does it.
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// NB: _M_callbacks and _M_word must be zero for non-initialized
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// ios_base to go through ~ios_base gracefully.
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}
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// 27.4.2.7 ios_base constructors/destructors
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ios_base::~ios_base()
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{
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_M_call_callbacks(erase_event);
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_M_dispose_callbacks();
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if (_M_word != _M_local_word)
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{
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delete [] _M_word;
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_M_word = 0;
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}
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}
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// 27.4.2.5 ios_base storage functions
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int
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ios_base::xalloc() throw()
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{
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// Implementation note: Initialize top to zero to ensure that
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// initialization occurs before main() is started.
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static _Atomic_word _S_top = 0;
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return __gnu_cxx::__exchange_and_add_dispatch(&_S_top, 1) + 4;
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}
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void
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ios_base::register_callback(event_callback __fn, int __index)
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{ _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); }
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// 27.4.2.5 [ios.base.storage] iword/pword storage
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ios_base::_Words&
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ios_base::_M_grow_words(int __ix, bool __iword)
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{
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// Precondition: _M_word_size <= __ix
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int __newsize = _S_local_word_size;
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_Words* __words = _M_local_word;
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const char* __error = nullptr;
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if ((unsigned)__ix >= (unsigned)numeric_limits<int>::max())
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__error = __N("ios_base::_M_grow_words is not valid");
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else if (__ix > _S_local_word_size - 1)
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{
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__newsize = __ix + 1;
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/* We still need to catch bad_alloc even though we use
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a nothrow new, because the new-expression can throw
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a bad_array_new_length. */
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__try
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{ __words = new (std::nothrow) _Words[__newsize]; }
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__catch(const std::bad_alloc&)
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{ __words = nullptr; }
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if (!__words)
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__error = __N("ios_base::_M_grow_words allocation failed");
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else
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{
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for (int __i = 0; __i < _M_word_size; __i++)
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__words[__i] = _M_word[__i];
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if (_M_word && _M_word != _M_local_word)
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{
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delete [] _M_word;
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_M_word = 0;
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}
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}
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}
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if (__error)
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{
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_M_streambuf_state |= badbit;
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if (_M_streambuf_state & _M_exception)
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__throw_ios_failure(__error);
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if (__iword)
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_M_word_zero._M_iword = 0;
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else
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_M_word_zero._M_pword = 0;
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return _M_word_zero;
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}
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_M_word = __words;
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_M_word_size = __newsize;
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return _M_word[__ix];
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}
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void
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ios_base::_M_call_callbacks(event __e) throw()
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{
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_Callback_list* __p = _M_callbacks;
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while (__p)
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{
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__try
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{ (*__p->_M_fn) (__e, *this, __p->_M_index); }
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__catch(...)
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{ }
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__p = __p->_M_next;
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}
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}
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void
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ios_base::_M_dispose_callbacks(void) throw()
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{
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_Callback_list* __p = _M_callbacks;
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while (__p && __p->_M_remove_reference() == 0)
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{
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_Callback_list* __next = __p->_M_next;
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delete __p;
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__p = __next;
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}
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_M_callbacks = 0;
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}
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void
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ios_base::_M_move(ios_base& __rhs) noexcept
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{
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_M_precision = __rhs._M_precision;
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_M_width = __rhs._M_width;
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_M_flags = __rhs._M_flags;
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_M_exception = __rhs._M_exception;
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_M_streambuf_state = __rhs._M_streambuf_state;
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_M_callbacks = std::__exchange(__rhs._M_callbacks, nullptr);
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if (_M_word != _M_local_word)
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delete[] _M_word;
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if (__rhs._M_word == __rhs._M_local_word)
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{
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_M_word = _M_local_word;
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_M_word_size = _S_local_word_size;
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for (int __i = 0; __i < _S_local_word_size; __i++)
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_M_word[__i] = std::__exchange(__rhs._M_word[__i], {});
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}
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else
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{
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_M_word = std::__exchange(__rhs._M_word, __rhs._M_local_word);
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_M_word_size
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= std::__exchange(__rhs._M_word_size, _S_local_word_size);
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}
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_M_ios_locale = __rhs._M_ios_locale;
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}
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void
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ios_base::_M_swap(ios_base& __rhs) noexcept
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{
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std::swap(_M_precision, __rhs._M_precision);
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std::swap(_M_width, __rhs._M_width);
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std::swap(_M_flags, __rhs._M_flags);
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std::swap(_M_exception, __rhs._M_exception);
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std::swap(_M_streambuf_state, __rhs._M_streambuf_state);
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std::swap(_M_callbacks, __rhs._M_callbacks);
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const bool __lhs_local = _M_word == _M_local_word;
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const bool __rhs_local = __rhs._M_word == __rhs._M_local_word;
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if (__lhs_local && __rhs_local)
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std::swap(_M_local_word, __rhs._M_local_word); // array swap
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else
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{
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if (!__lhs_local && !__rhs_local)
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std::swap(_M_word, __rhs._M_word);
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else
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{
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ios_base* __local;
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ios_base* __allocated;
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if (__lhs_local)
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{
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__local = this;
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__allocated = &__rhs;
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}
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else
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{
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__local = &__rhs;
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__allocated= this;
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}
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for (int __i = 0; __i < _S_local_word_size; __i++)
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__allocated->_M_local_word[__i] = __local->_M_local_word[__i];
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__local->_M_word = __allocated->_M_word;
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__allocated->_M_word = __allocated->_M_local_word;
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}
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std::swap(_M_word_size, __rhs._M_word_size);
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}
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std::swap(_M_ios_locale, __rhs._M_ios_locale);
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}
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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