// Iostreams base classes -*- C++ -*-
-// Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
+// 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
// ISO C++ 14882: 27.4 Iostreams base classes
//
-#include <bits/std_ios.h>
-#include <bits/std_ostream.h>
-#include <bits/std_istream.h>
-#include <bits/std_fstream.h>
+#include <ios>
+#include <limits>
+#include <bits/atomicity.h>
namespace std
{
const ios_base::seekdir ios_base::cur;
const ios_base::seekdir ios_base::end;
- const int ios_base::_S_local_words;
- int ios_base::Init::_S_ios_base_init = 0;
- bool ios_base::Init::_S_synced_with_stdio = true;
-
- istream cin(NULL);
- ostream cout(NULL);
- ostream cerr(NULL);
- ostream clog(NULL);
-#ifdef _GLIBCPP_USE_WCHAR_T
- wistream wcin(NULL);
- wostream wcout(NULL);
- wostream wcerr(NULL);
- wostream wclog(NULL);
-#endif
-
- ios_base::failure::failure(const string& __str)
- {
- strncpy(_M_name, __str.c_str(), _M_bufsize);
- _M_name[_M_bufsize - 1] = '\0';
- }
+ const int ios_base::_S_local_word_size;
- ios_base::failure::~failure()
- { }
+ _Atomic_word ios_base::Init::_S_refcount;
- const char*
- ios_base::failure::what() const throw()
- { return _M_name; }
+ bool ios_base::Init::_S_synced_with_stdio = true;
- ios_base::Init::Init()
+ ios_base::ios_base()
+ : _M_callbacks(0), _M_word_size(_S_local_word_size), _M_word(_M_local_word)
{
- if (++_S_ios_base_init == 1)
- {
- // NB: std_iostream.h creates the four standard files with
- // NULL buffers. At this point, we swap out these placeholder
- // objects for the properly-constructed ones
- _M_cout = new filebuf(1, "stdout", ios_base::out);
- _M_cin = new filebuf(0, "stdin", ios_base::in);
- _M_cerr = new filebuf(2, "stderr", ios_base::out);
- new (&cout) ostream(_M_cout);
- new (&cin) istream(_M_cin);
- new (&cerr) ostream(_M_cerr);
- new (&clog) ostream(_M_cerr);
- cin.tie(&cout);
- cerr.flags(ios_base::unitbuf);
-
-#ifdef _GLIBCPP_USE_WCHAR_T
- _M_wcout = new wfilebuf(1, "stdout", ios_base::out);
- _M_wcin = new wfilebuf(0, "stdin", ios_base::in);
- _M_wcerr = new wfilebuf(2, "stderr", ios_base::out);
- new (&wcout) wostream(_M_wcout);
- new (&wcin) wistream(_M_wcin);
- new (&wcerr) wostream(_M_wcerr);
- new (&wclog) wostream(_M_wcerr);
- wcin.tie(&wcout);
- wcerr.flags(ios_base::unitbuf);
-#endif
- ios_base::Init::_S_synced_with_stdio = true;
- }
+ // 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.
}
-
- ios_base::Init::~Init()
+
+ // 27.4.2.7 ios_base constructors/destructors
+ ios_base::~ios_base()
{
- if (--_S_ios_base_init == 0)
+ _M_call_callbacks(erase_event);
+ _M_dispose_callbacks();
+ if (_M_word != _M_local_word)
{
- cout.flush();
- cerr.flush();
- clog.flush();
- delete _M_cout;
- delete _M_cin;
- delete _M_cerr;
- _M_cout = NULL;
- _M_cin = NULL;
- _M_cerr = NULL;
-#ifdef _GLIBCPP_USE_WCHAR_T
- wcout.flush();
- wcerr.flush();
- wclog.flush();
- delete _M_wcout;
- delete _M_wcin;
- delete _M_wcerr;
- _M_wcout = NULL;
- _M_wcin = NULL;
- _M_wcerr = NULL;
-#endif
+ delete [] _M_word;
+ _M_word = 0;
}
- }
+ }
// 27.4.2.5 ios_base storage functions
int
ios_base::xalloc() throw()
{
- // XXX MT
- // XXX should be a symbol. (Reserve 0..3 for builtins.)
- static int top = 4;
- return top++;
+ // Implementation note: Initialize top to zero to ensure that
+ // initialization occurs before main() is started.
+ static _Atomic_word _S_top = 0;
+ return __exchange_and_add(&_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)
+ ios_base::_M_grow_words(int ix, bool iword)
{
- // Precondition: _M_word_limit <= ix
- _Words zero = { 0, 0 };
- int newlimit = _S_local_words;
- _Words* words = _M_word_array;
- int i = 0;
- if (_S_local_words <= ix)
+ // Precondition: _M_word_size <= ix
+ int newsize = _S_local_word_size;
+ _Words* words = _M_local_word;
+ if (ix > _S_local_word_size - 1)
{
- newlimit = ix+1;
- try
- { words = new _Words[ix+1]; }
- catch (...)
+ if (ix < numeric_limits<int>::max())
{
- _M_dummy = zero; // XXX MT? Not on "normal" machines.
- // XXX now in basic_ios
- // _M_clear(_M_rdstate() | badbit); // may throw
- return _M_dummy;
+ newsize = ix + 1;
+ try
+ { words = new _Words[newsize]; }
+ catch (...)
+ {
+ _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;
}
- for (; i < _M_word_limit; i++)
- words[i] = _M_words[i];
- if (_M_words != _M_word_array)
- delete [] _M_words;
}
-
- do { words[i] = zero; } while (++i < newlimit);
- _M_words = words;
- _M_word_limit = newlimit;
- return words[ix];
- }
-
- // Called only by basic_ios<>::init.
- void
- ios_base::_M_init()
- {
- // NB: May be called more than once
- _M_precision = 6;
- _M_width = 0;
- _M_flags = skipws | dec;
- _M_callbacks = 0;
- _M_words = 0;
- _M_word_limit = 0;
- _M_ios_locale = locale();
- // No init needed for _M_word_array or _M_dummy.
- }
-
- // 27.4.2.3 ios_base locale functions
- locale
- ios_base::imbue(const locale& __loc)
- {
- locale __old = _M_ios_locale;
- _M_ios_locale = __loc;
- // Make sure there's a callback for the format caches so they will be
- // marked dirty.
- _Format_cache<char>::_S_get(*this);
-#ifdef _GLIBCPP_USE_WCHAR_T
- _Format_cache<wchar_t>::_S_get(*this);
-#endif
- _M_call_callbacks(imbue_event);
- return __old;
- }
-
- ios_base::ios_base()
- {
- // Do nothing; init() does it. Static init to 0 makes everything sane.
- }
-
- // 27.4.2.7 ios_base constructors/destructors
- ios_base::~ios_base()
- {
- _M_call_callbacks(erase_event);
- _M_dispose_callbacks();
- if (_M_words != _M_word_array)
- delete [] _M_words;
- // XXX done?
+ _M_word = words;
+ _M_word_size = newsize;
+ return _M_word[ix];
}
void
- ios_base::register_callback(event_callback __fn, int __index)
- { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); }
-
- void
ios_base::_M_call_callbacks(event __e) throw()
{
- for (_Callback_list* __p = _M_callbacks; __p; __p = __p->_M_next)
+ _Callback_list* __p = _M_callbacks;
+ while (__p)
{
- try {
- (*__p->_M_fn) (__e, *this, __p->_M_index);
- }
- catch (...) {
- }
+ try
+ { (*__p->_M_fn) (__e, *this, __p->_M_index); }
+ catch (...)
+ { }
+ __p = __p->_M_next;
}
}
}
_M_callbacks = 0;
}
-
- bool
- ios_base::sync_with_stdio(bool __sync)
- {
-#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
- // 49. Underspecification of ios_base::sync_with_stdio
- bool __ret = ios_base::Init::_S_synced_with_stdio;
-#endif
-
- // Turn off sync with C FILE* for cin, cout, cerr, clog iff
- // currently synchronized.
- if (!__sync && __ret)
- {
-#if 0
- // no longer need to do this
- // Need to dispose of the buffers created at initialization.
- __ioinit._M_cout->~filebuf();
- __ioinit._M_cin->~filebuf();
- __ioinit._M_cerr->~filebuf();
- __ioinit._M_cout = new filebuf();
- __ioinit._M_cin = new filebuf();
- __ioinit._M_cerr = new filebuf();
- __ioinit._M_cout->open("stdout", ios_base::out);
- __ioinit._M_cin->open("stdin", ios_base::in);
- __ioinit._M_cerr->open("stderr", ios_base::out);
- cout.rdbuf(__ioinit._M_cout);
- cin.rdbuf(__ioinit._M_cin);
- cerr.rdbuf(__ioinit._M_cerr);
- cerr.flags(ios_base::unitbuf);
- clog.rdbuf(__ioinit._M_cerr);
-#endif
-#ifdef _GLIBCPP_USE_WCHAR_T
-#endif
- ios_base::Init::_S_synced_with_stdio = false;
- }
-
- return __ret;
- }
-
-} // namespace std
-
-
-
-
-
-
-
-
-
-
-
-
+} // namespace std
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