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// Iostreams base classes -*- C++ -*-
// Copyright (C) 1997-2023 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 [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<int>::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
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