// 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 <ostream>
+#include <istream>
+#include <fstream>
+#include <bits/atomicity.h>
+#include <ext/stdio_filebuf.h>
+#include <ext/stdio_sync_filebuf.h>
-namespace std
+namespace __gnu_cxx
{
// Extern declarations for global objects in src/globals.cc.
+ extern stdio_sync_filebuf<char> buf_cout_sync;
+ extern stdio_sync_filebuf<char> buf_cin_sync;
+ extern stdio_sync_filebuf<char> buf_cerr_sync;
+
+ extern stdio_filebuf<char> buf_cout;
+ extern stdio_filebuf<char> buf_cin;
+ extern stdio_filebuf<char> buf_cerr;
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ extern stdio_sync_filebuf<wchar_t> buf_wcout_sync;
+ extern stdio_sync_filebuf<wchar_t> buf_wcin_sync;
+ extern stdio_sync_filebuf<wchar_t> buf_wcerr_sync;
+
+ extern stdio_filebuf<wchar_t> buf_wcout;
+ extern stdio_filebuf<wchar_t> buf_wcin;
+ extern stdio_filebuf<wchar_t> buf_wcerr;
+#endif
+} // namespace __gnu_cxx
+
+namespace std
+{
+ using namespace __gnu_cxx;
+
extern istream cin;
extern ostream cout;
extern ostream cerr;
extern ostream clog;
- extern filebuf buf_cout;
- extern filebuf buf_cin;
- extern filebuf buf_cerr;
-#ifdef _GLIBCPP_USE_WCHAR_T
+#ifdef _GLIBCXX_USE_WCHAR_T
extern wistream wcin;
extern wostream wcout;
extern wostream wcerr;
extern wostream wclog;
- extern wfilebuf buf_wcout;
- extern wfilebuf buf_wcin;
- extern wfilebuf buf_wcerr;
#endif
// Definitions for static const data members of __ios_flags.
const ios_base::seekdir ios_base::cur;
const ios_base::seekdir ios_base::end;
- const int ios_base::_S_local_words;
+ const int ios_base::_S_local_word_size;
int ios_base::Init::_S_ios_base_init = 0;
bool ios_base::Init::_S_synced_with_stdio = true;
ios_base::failure::failure(const string& __str) throw()
{
- strncpy(_M_name, __str.c_str(), _M_bufsize);
- _M_name[_M_bufsize - 1] = '\0';
+ strncpy(_M_name, __str.c_str(), _S_bufsize);
+ _M_name[_S_bufsize - 1] = '\0';
}
ios_base::failure::~failure() throw()
ios_base::failure::what() const throw()
{ return _M_name; }
- void
- ios_base::Init::_S_ios_create(bool __sync)
- {
- int __out_bufsize = __sync ? 0 : static_cast<int>(BUFSIZ);
- int __in_bufsize = __sync ? 1 : static_cast<int>(BUFSIZ);
-
-#if _GLIBCPP_AVOID_FSEEK
- // Platforms that prefer to avoid fseek() calls on streams only
- // get their desire when the C++-layer input buffer size is 1.
- // This hack hurts performance but keeps correctness across
- // all types of streams that might be attached to (e.g.) cin.
- __in_bufsize = 1;
-#endif
-
- // NB: The file globals.cc creates the four standard files
- // with NULL buffers. At this point, we swap out the dummy NULL
- // [io]stream objects and buffers with the real deal.
- new (&buf_cout) filebuf(stdout, ios_base::out, __out_bufsize);
- new (&buf_cin) filebuf(stdin, ios_base::in, __in_bufsize);
- new (&buf_cerr) filebuf(stderr, ios_base::out, __out_bufsize);
- new (&cout) ostream(&buf_cout);
- new (&cin) istream(&buf_cin);
- new (&cerr) ostream(&buf_cerr);
- new (&clog) ostream(&buf_cerr);
- cin.tie(&cout);
- cerr.flags(ios_base::unitbuf);
-
-#ifdef _GLIBCPP_USE_WCHAR_T
- new (&buf_wcout) wfilebuf(stdout, ios_base::out, __out_bufsize);
- new (&buf_wcin) wfilebuf(stdin, ios_base::in, __in_bufsize);
- new (&buf_wcerr) wfilebuf(stderr, ios_base::out, __out_bufsize);
- new (&wcout) wostream(&buf_wcout);
- new (&wcin) wistream(&buf_wcin);
- new (&wcerr) wostream(&buf_wcerr);
- new (&wclog) wostream(&buf_wcerr);
- wcin.tie(&wcout);
- wcerr.flags(ios_base::unitbuf);
-#endif
- }
-
- void
- ios_base::Init::_S_ios_destroy()
- {
- // Explicitly call dtors to free any memory that is dynamically
- // allocated by filebuf ctor or member functions, but don't
- // deallocate all memory by calling operator delete.
- cout.flush();
- cerr.flush();
- clog.flush();
- buf_cout.~filebuf();
- buf_cin.~filebuf();
- buf_cerr.~filebuf();
-#ifdef _GLIBCPP_USE_WCHAR_T
- wcout.flush();
- wcerr.flush();
- wclog.flush();
- buf_wcout.~wfilebuf();
- buf_wcin.~wfilebuf();
- buf_wcerr.~wfilebuf();
-#endif
- }
-
ios_base::Init::Init()
{
if (_S_ios_base_init == 0)
{
// Standard streams default to synced with "C" operations.
ios_base::Init::_S_synced_with_stdio = true;
- _S_ios_create(ios_base::Init::_S_synced_with_stdio);
+
+ new (&buf_cout_sync) stdio_sync_filebuf<char>(stdout);
+ new (&buf_cin_sync) stdio_sync_filebuf<char>(stdin);
+ new (&buf_cerr_sync) stdio_sync_filebuf<char>(stderr);
+
+ // The standard streams are constructed once only and never
+ // destroyed.
+ new (&cout) ostream(&buf_cout_sync);
+ new (&cin) istream(&buf_cin_sync);
+ new (&cerr) ostream(&buf_cerr_sync);
+ new (&clog) ostream(&buf_cerr_sync);
+ cin.tie(&cout);
+ cerr.flags(ios_base::unitbuf);
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ new (&buf_wcout_sync) stdio_sync_filebuf<wchar_t>(stdout);
+ new (&buf_wcin_sync) stdio_sync_filebuf<wchar_t>(stdin);
+ new (&buf_wcerr_sync) stdio_sync_filebuf<wchar_t>(stderr);
+
+ new (&wcout) wostream(&buf_wcout_sync);
+ new (&wcin) wistream(&buf_wcin_sync);
+ new (&wcerr) wostream(&buf_wcerr_sync);
+ new (&wclog) wostream(&buf_wcerr_sync);
+ wcin.tie(&wcout);
+ wcerr.flags(ios_base::unitbuf);
+#endif
+
+ _S_ios_base_init = 1;
}
++_S_ios_base_init;
}
ios_base::Init::~Init()
{
- if (--_S_ios_base_init == 0)
- _S_ios_destroy();
+ if (--_S_ios_base_init == 1)
+ {
+ // Catch any exceptions thrown by basic_ostream::flush()
+ try
+ {
+ // Flush standard output streams as required by 27.4.2.1.6
+ cout.flush();
+ cerr.flush();
+ clog.flush();
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ wcout.flush();
+ wcerr.flush();
+ wclog.flush();
+#endif
+ }
+ catch (...)
+ { }
+ }
}
// 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;
}
// 27.4.2.5 iword/pword storage
ios_base::_Words&
ios_base::_M_grow_words(int ix)
{
- // 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())
+ {
+ newsize = ix + 1;
+ try
+ { words = new _Words[newsize]; }
+ catch (...)
+ {
+ _M_streambuf_state |= badbit;
+ if (_M_streambuf_state & _M_exception)
+ __throw_ios_failure("ios_base::_M_grow_words "
+ "allocation failed");
+ 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_dummy = zero; // XXX MT? Not on "normal" machines.
- // XXX now in basic_ios
- // _M_clear(_M_rdstate() | badbit); // may throw
- return _M_dummy;
+ _M_streambuf_state |= badbit;
+ if (_M_streambuf_state & _M_exception)
+ __throw_ios_failure("ios_base::_M_grow_words is not valid");
+ 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];
+ _M_word = words;
+ _M_word_size = newsize;
+ return _M_word[ix];
}
// Called only by basic_ios<>::init.
_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
return __old;
}
- ios_base::ios_base()
+ ios_base::ios_base()
+ : _M_callbacks(0), _M_word_size(_S_local_word_size), _M_word(_M_local_word)
{
- // Do nothing; init() does it. Static init to 0 makes everything sane.
+ // 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
{
_M_call_callbacks(erase_event);
_M_dispose_callbacks();
- if (_M_words != _M_word_array)
- delete [] _M_words;
- // XXX done?
+ if (_M_word != _M_local_word)
+ {
+ delete [] _M_word;
+ _M_word = 0;
+ }
}
void
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;
}
}
bool
ios_base::sync_with_stdio(bool __sync)
{
-#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
+#ifdef _GLIBCXX_RESOLVE_LIB_DEFECTS
// 49. Underspecification of ios_base::sync_with_stdio
bool __ret = ios_base::Init::_S_synced_with_stdio;
#endif
// currently synchronized.
if (!__sync && __ret)
{
- ios_base::Init::_S_synced_with_stdio = false;
- ios_base::Init::_S_ios_destroy();
- ios_base::Init::_S_ios_create(ios_base::Init::_S_synced_with_stdio);
+ ios_base::Init::_S_synced_with_stdio = __sync;
+
+ // Explicitly call dtors to free any memory that is
+ // dynamically allocated by filebuf ctor or member functions,
+ // but don't deallocate all memory by calling operator delete.
+ buf_cout_sync.~stdio_sync_filebuf<char>();
+ buf_cin_sync.~stdio_sync_filebuf<char>();
+ buf_cerr_sync.~stdio_sync_filebuf<char>();
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ buf_wcout_sync.~stdio_sync_filebuf<wchar_t>();
+ buf_wcin_sync.~stdio_sync_filebuf<wchar_t>();
+ buf_wcerr_sync.~stdio_sync_filebuf<wchar_t>();
+#endif
+
+ // Create stream buffers for the standard streams and use
+ // those buffers without destroying and recreating the
+ // streams.
+ new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out);
+ new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in);
+ new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out);
+ cout.rdbuf(&buf_cout);
+ cin.rdbuf(&buf_cin);
+ cerr.rdbuf(&buf_cerr);
+ clog.rdbuf(&buf_cerr);
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out);
+ new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in);
+ new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out);
+ wcout.rdbuf(&buf_wcout);
+ wcin.rdbuf(&buf_wcin);
+ wcerr.rdbuf(&buf_wcerr);
+ wclog.rdbuf(&buf_wcerr);
+#endif
}
return __ret;
}
} // namespace std
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