402 lines
12 KiB
C++
402 lines
12 KiB
C++
// Iostreams base classes -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
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// 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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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 <ostream>
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#include <istream>
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#include <fstream>
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#include <bits/atomicity.h>
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#include <ext/stdio_filebuf.h>
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#include <ext/stdio_sync_filebuf.h>
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namespace __gnu_cxx
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{
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// Extern declarations for global objects in src/globals.cc.
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extern stdio_sync_filebuf<char> buf_cout_sync;
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extern stdio_sync_filebuf<char> buf_cin_sync;
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extern stdio_sync_filebuf<char> buf_cerr_sync;
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extern stdio_filebuf<char> buf_cout;
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extern stdio_filebuf<char> buf_cin;
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extern stdio_filebuf<char> buf_cerr;
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#ifdef _GLIBCPP_USE_WCHAR_T
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extern stdio_sync_filebuf<wchar_t> buf_wcout_sync;
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extern stdio_sync_filebuf<wchar_t> buf_wcin_sync;
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extern stdio_sync_filebuf<wchar_t> buf_wcerr_sync;
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extern stdio_filebuf<wchar_t> buf_wcout;
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extern stdio_filebuf<wchar_t> buf_wcin;
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extern stdio_filebuf<wchar_t> buf_wcerr;
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#endif
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} // namespace __gnu_cxx
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namespace std
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{
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using namespace __gnu_cxx;
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extern istream cin;
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extern ostream cout;
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extern ostream cerr;
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extern ostream clog;
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#ifdef _GLIBCPP_USE_WCHAR_T
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extern wistream wcin;
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extern wostream wcout;
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extern wostream wcerr;
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extern wostream wclog;
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#endif
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// Definitions for static const data members of __ios_flags.
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const __ios_flags::__int_type __ios_flags::_S_boolalpha;
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const __ios_flags::__int_type __ios_flags::_S_dec;
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const __ios_flags::__int_type __ios_flags::_S_fixed;
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const __ios_flags::__int_type __ios_flags::_S_hex;
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const __ios_flags::__int_type __ios_flags::_S_internal;
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const __ios_flags::__int_type __ios_flags::_S_left;
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const __ios_flags::__int_type __ios_flags::_S_oct;
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const __ios_flags::__int_type __ios_flags::_S_right;
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const __ios_flags::__int_type __ios_flags::_S_scientific;
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const __ios_flags::__int_type __ios_flags::_S_showbase;
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const __ios_flags::__int_type __ios_flags::_S_showpoint;
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const __ios_flags::__int_type __ios_flags::_S_showpos;
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const __ios_flags::__int_type __ios_flags::_S_skipws;
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const __ios_flags::__int_type __ios_flags::_S_unitbuf;
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const __ios_flags::__int_type __ios_flags::_S_uppercase;
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const __ios_flags::__int_type __ios_flags::_S_adjustfield;
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const __ios_flags::__int_type __ios_flags::_S_basefield;
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const __ios_flags::__int_type __ios_flags::_S_floatfield;
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const __ios_flags::__int_type __ios_flags::_S_badbit;
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const __ios_flags::__int_type __ios_flags::_S_eofbit;
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const __ios_flags::__int_type __ios_flags::_S_failbit;
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const __ios_flags::__int_type __ios_flags::_S_app;
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const __ios_flags::__int_type __ios_flags::_S_ate;
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const __ios_flags::__int_type __ios_flags::_S_bin;
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const __ios_flags::__int_type __ios_flags::_S_in;
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const __ios_flags::__int_type __ios_flags::_S_out;
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const __ios_flags::__int_type __ios_flags::_S_trunc;
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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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const int ios_base::_S_local_word_size;
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int ios_base::Init::_S_ios_base_init = 0;
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bool ios_base::Init::_S_synced_with_stdio = true;
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ios_base::failure::failure(const string& __str) throw()
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{
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strncpy(_M_name, __str.c_str(), _S_bufsize);
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_M_name[_S_bufsize - 1] = '\0';
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}
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ios_base::failure::~failure() throw()
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{ }
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const char*
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ios_base::failure::what() const throw()
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{ return _M_name; }
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ios_base::Init::Init()
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{
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if (_S_ios_base_init == 0)
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{
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// Standard streams default to synced with "C" operations.
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ios_base::Init::_S_synced_with_stdio = true;
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new (&buf_cout_sync) stdio_sync_filebuf<char>(stdout);
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new (&buf_cin_sync) stdio_sync_filebuf<char>(stdin);
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new (&buf_cerr_sync) stdio_sync_filebuf<char>(stderr);
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// The standard streams are constructed once only and never
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// destroyed.
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new (&cout) ostream(&buf_cout_sync);
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new (&cin) istream(&buf_cin_sync);
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new (&cerr) ostream(&buf_cerr_sync);
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new (&clog) ostream(&buf_cerr_sync);
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cin.tie(&cout);
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cerr.flags(ios_base::unitbuf);
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#ifdef _GLIBCPP_USE_WCHAR_T
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new (&buf_wcout_sync) stdio_sync_filebuf<wchar_t>(stdout);
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new (&buf_wcin_sync) stdio_sync_filebuf<wchar_t>(stdin);
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new (&buf_wcerr_sync) stdio_sync_filebuf<wchar_t>(stderr);
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new (&wcout) wostream(&buf_wcout_sync);
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new (&wcin) wistream(&buf_wcin_sync);
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new (&wcerr) wostream(&buf_wcerr_sync);
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new (&wclog) wostream(&buf_wcerr_sync);
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wcin.tie(&wcout);
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wcerr.flags(ios_base::unitbuf);
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#endif
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_S_ios_base_init = 1;
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}
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++_S_ios_base_init;
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}
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ios_base::Init::~Init()
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{
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if (--_S_ios_base_init == 1)
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{
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// Catch any exceptions thrown by basic_ostream::flush()
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try
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{
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// Flush standard output streams as required by 27.4.2.1.6
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cout.flush();
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cerr.flush();
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clog.flush();
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#ifdef _GLIBCPP_USE_WCHAR_T
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wcout.flush();
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wcerr.flush();
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wclog.flush();
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#endif
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}
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catch (...)
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{ }
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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 __exchange_and_add(&_S_top, 1) + 4;
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}
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// 27.4.2.5 iword/pword storage
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ios_base::_Words&
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ios_base::_M_grow_words(int ix)
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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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if (ix > _S_local_word_size - 1)
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{
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if (ix < numeric_limits<int>::max())
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{
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newsize = ix + 1;
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try
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{ words = new _Words[newsize]; }
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catch (...)
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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("ios_base::_M_grow_words "
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"allocation failed");
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return _M_word_zero;
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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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else
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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("ios_base::_M_grow_words ix not valid");
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return _M_word_zero;
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}
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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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// Called only by basic_ios<>::init.
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void
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ios_base::_M_init()
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{
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// NB: May be called more than once
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_M_precision = 6;
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_M_width = 0;
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_M_flags = skipws | dec;
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_M_ios_locale = locale();
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}
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// 27.4.2.3 ios_base locale functions
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locale
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ios_base::imbue(const locale& __loc)
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{
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locale __old = _M_ios_locale;
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_M_ios_locale = __loc;
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_M_call_callbacks(imbue_event);
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return __old;
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}
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ios_base::ios_base() : _M_callbacks(0), _M_word_size(_S_local_word_size),
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_M_word(_M_local_word), _M_locale_cache(0)
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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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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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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)
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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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bool
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ios_base::sync_with_stdio(bool __sync)
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{
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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 49. Underspecification of ios_base::sync_with_stdio
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bool __ret = ios_base::Init::_S_synced_with_stdio;
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#endif
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// Turn off sync with C FILE* for cin, cout, cerr, clog iff
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// currently synchronized.
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if (!__sync && __ret)
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{
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ios_base::Init::_S_synced_with_stdio = __sync;
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// Explicitly call dtors to free any memory that is
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// dynamically allocated by filebuf ctor or member functions,
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// but don't deallocate all memory by calling operator delete.
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buf_cout_sync.~stdio_sync_filebuf<char>();
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buf_cin_sync.~stdio_sync_filebuf<char>();
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buf_cerr_sync.~stdio_sync_filebuf<char>();
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#ifdef _GLIBCPP_USE_WCHAR_T
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buf_wcout_sync.~stdio_sync_filebuf<wchar_t>();
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buf_wcin_sync.~stdio_sync_filebuf<wchar_t>();
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buf_wcerr_sync.~stdio_sync_filebuf<wchar_t>();
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#endif
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// Create stream buffers for the standard streams and use
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// those buffers without destroying and recreating the
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// streams.
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new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out);
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new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in);
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new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out);
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cout.rdbuf(&buf_cout);
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cin.rdbuf(&buf_cin);
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cerr.rdbuf(&buf_cerr);
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clog.rdbuf(&buf_cerr);
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#ifdef _GLIBCPP_USE_WCHAR_T
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new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out);
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new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in);
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new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out);
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wcout.rdbuf(&buf_wcout);
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wcin.rdbuf(&buf_wcin);
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wcerr.rdbuf(&buf_wcerr);
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wclog.rdbuf(&buf_wcerr);
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#endif
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}
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return __ret;
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}
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} // namespace std
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