ios.cc revision 97403
197403Sobrien// Iostreams base classes -*- C++ -*- 297403Sobrien 397403Sobrien// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 497403Sobrien// Free Software Foundation, Inc. 597403Sobrien// 697403Sobrien// This file is part of the GNU ISO C++ Library. This library is free 797403Sobrien// software; you can redistribute it and/or modify it under the 897403Sobrien// terms of the GNU General Public License as published by the 997403Sobrien// Free Software Foundation; either version 2, or (at your option) 1097403Sobrien// any later version. 1197403Sobrien 1297403Sobrien// This library is distributed in the hope that it will be useful, 1397403Sobrien// but WITHOUT ANY WARRANTY; without even the implied warranty of 1497403Sobrien// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1597403Sobrien// GNU General Public License for more details. 1697403Sobrien 1797403Sobrien// You should have received a copy of the GNU General Public License along 1897403Sobrien// with this library; see the file COPYING. If not, write to the Free 1997403Sobrien// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 2097403Sobrien// USA. 2197403Sobrien 2297403Sobrien// As a special exception, you may use this file as part of a free software 2397403Sobrien// library without restriction. Specifically, if other files instantiate 2497403Sobrien// templates or use macros or inline functions from this file, or you compile 2597403Sobrien// this file and link it with other files to produce an executable, this 2697403Sobrien// file does not by itself cause the resulting executable to be covered by 2797403Sobrien// the GNU General Public License. This exception does not however 2897403Sobrien// invalidate any other reasons why the executable file might be covered by 2997403Sobrien// the GNU General Public License. 3097403Sobrien 3197403Sobrien// 3297403Sobrien// ISO C++ 14882: 27.4 Iostreams base classes 3397403Sobrien// 3497403Sobrien 3597403Sobrien#include <ios> 3697403Sobrien#include <ostream> 3797403Sobrien#include <istream> 3897403Sobrien#include <fstream> 3997403Sobrien#include <bits/atomicity.h> 4097403Sobrien#include <ext/stdio_filebuf.h> 4197403Sobrien 4297403Sobriennamespace std 4397403Sobrien{ 4497403Sobrien // Extern declarations for global objects in src/globals.cc. 4597403Sobrien extern istream cin; 4697403Sobrien extern ostream cout; 4797403Sobrien extern ostream cerr; 4897403Sobrien extern ostream clog; 4997403Sobrien 5097403Sobrien using __gnu_cxx::stdio_filebuf; 5197403Sobrien extern stdio_filebuf<char> buf_cout; 5297403Sobrien extern stdio_filebuf<char> buf_cin; 5397403Sobrien extern stdio_filebuf<char> buf_cerr; 5497403Sobrien 5597403Sobrien#ifdef _GLIBCPP_USE_WCHAR_T 5697403Sobrien extern wistream wcin; 5797403Sobrien extern wostream wcout; 5897403Sobrien extern wostream wcerr; 5997403Sobrien extern wostream wclog; 6097403Sobrien 6197403Sobrien extern stdio_filebuf<wchar_t> buf_wcout; 6297403Sobrien extern stdio_filebuf<wchar_t> buf_wcin; 6397403Sobrien extern stdio_filebuf<wchar_t> buf_wcerr; 6497403Sobrien#endif 6597403Sobrien 6697403Sobrien // Definitions for static const data members of __ios_flags. 6797403Sobrien const __ios_flags::__int_type __ios_flags::_S_boolalpha; 6897403Sobrien const __ios_flags::__int_type __ios_flags::_S_dec; 6997403Sobrien const __ios_flags::__int_type __ios_flags::_S_fixed; 7097403Sobrien const __ios_flags::__int_type __ios_flags::_S_hex; 7197403Sobrien const __ios_flags::__int_type __ios_flags::_S_internal; 7297403Sobrien const __ios_flags::__int_type __ios_flags::_S_left; 7397403Sobrien const __ios_flags::__int_type __ios_flags::_S_oct; 7497403Sobrien const __ios_flags::__int_type __ios_flags::_S_right; 7597403Sobrien const __ios_flags::__int_type __ios_flags::_S_scientific; 7697403Sobrien const __ios_flags::__int_type __ios_flags::_S_showbase; 7797403Sobrien const __ios_flags::__int_type __ios_flags::_S_showpoint; 7897403Sobrien const __ios_flags::__int_type __ios_flags::_S_showpos; 7997403Sobrien const __ios_flags::__int_type __ios_flags::_S_skipws; 8097403Sobrien const __ios_flags::__int_type __ios_flags::_S_unitbuf; 8197403Sobrien const __ios_flags::__int_type __ios_flags::_S_uppercase; 8297403Sobrien const __ios_flags::__int_type __ios_flags::_S_adjustfield; 8397403Sobrien const __ios_flags::__int_type __ios_flags::_S_basefield; 8497403Sobrien const __ios_flags::__int_type __ios_flags::_S_floatfield; 8597403Sobrien 8697403Sobrien const __ios_flags::__int_type __ios_flags::_S_badbit; 8797403Sobrien const __ios_flags::__int_type __ios_flags::_S_eofbit; 8897403Sobrien const __ios_flags::__int_type __ios_flags::_S_failbit; 8997403Sobrien 9097403Sobrien const __ios_flags::__int_type __ios_flags::_S_app; 9197403Sobrien const __ios_flags::__int_type __ios_flags::_S_ate; 9297403Sobrien const __ios_flags::__int_type __ios_flags::_S_bin; 9397403Sobrien const __ios_flags::__int_type __ios_flags::_S_in; 9497403Sobrien const __ios_flags::__int_type __ios_flags::_S_out; 9597403Sobrien const __ios_flags::__int_type __ios_flags::_S_trunc; 9697403Sobrien 9797403Sobrien // Definitions for static const members of ios_base. 9897403Sobrien const ios_base::fmtflags ios_base::boolalpha; 9997403Sobrien const ios_base::fmtflags ios_base::dec; 10097403Sobrien const ios_base::fmtflags ios_base::fixed; 10197403Sobrien const ios_base::fmtflags ios_base::hex; 10297403Sobrien const ios_base::fmtflags ios_base::internal; 10397403Sobrien const ios_base::fmtflags ios_base::left; 10497403Sobrien const ios_base::fmtflags ios_base::oct; 10597403Sobrien const ios_base::fmtflags ios_base::right; 10697403Sobrien const ios_base::fmtflags ios_base::scientific; 10797403Sobrien const ios_base::fmtflags ios_base::showbase; 10897403Sobrien const ios_base::fmtflags ios_base::showpoint; 10997403Sobrien const ios_base::fmtflags ios_base::showpos; 11097403Sobrien const ios_base::fmtflags ios_base::skipws; 11197403Sobrien const ios_base::fmtflags ios_base::unitbuf; 11297403Sobrien const ios_base::fmtflags ios_base::uppercase; 11397403Sobrien const ios_base::fmtflags ios_base::adjustfield; 11497403Sobrien const ios_base::fmtflags ios_base::basefield; 11597403Sobrien const ios_base::fmtflags ios_base::floatfield; 11697403Sobrien 11797403Sobrien const ios_base::iostate ios_base::badbit; 11897403Sobrien const ios_base::iostate ios_base::eofbit; 11997403Sobrien const ios_base::iostate ios_base::failbit; 12097403Sobrien const ios_base::iostate ios_base::goodbit; 12197403Sobrien 12297403Sobrien const ios_base::openmode ios_base::app; 12397403Sobrien const ios_base::openmode ios_base::ate; 12497403Sobrien const ios_base::openmode ios_base::binary; 12597403Sobrien const ios_base::openmode ios_base::in; 12697403Sobrien const ios_base::openmode ios_base::out; 12797403Sobrien const ios_base::openmode ios_base::trunc; 12897403Sobrien 12997403Sobrien const ios_base::seekdir ios_base::beg; 13097403Sobrien const ios_base::seekdir ios_base::cur; 13197403Sobrien const ios_base::seekdir ios_base::end; 13297403Sobrien 13397403Sobrien const int ios_base::_S_local_word_size; 13497403Sobrien int ios_base::Init::_S_ios_base_init = 0; 13597403Sobrien bool ios_base::Init::_S_synced_with_stdio = true; 13697403Sobrien 13797403Sobrien ios_base::failure::failure(const string& __str) throw() 13897403Sobrien { 13997403Sobrien strncpy(_M_name, __str.c_str(), _M_bufsize); 14097403Sobrien _M_name[_M_bufsize - 1] = '\0'; 14197403Sobrien } 14297403Sobrien 14397403Sobrien ios_base::failure::~failure() throw() 14497403Sobrien { } 14597403Sobrien 14697403Sobrien const char* 14797403Sobrien ios_base::failure::what() const throw() 14897403Sobrien { return _M_name; } 14997403Sobrien 15097403Sobrien void 15197403Sobrien ios_base::Init::_S_ios_create(bool __sync) 15297403Sobrien { 15397403Sobrien int __out_size = __sync ? 0 : static_cast<int>(BUFSIZ); 15497403Sobrien int __in_size = __sync ? 1 : static_cast<int>(BUFSIZ); 15597403Sobrien 15697403Sobrien // NB: The file globals.cc creates the four standard files 15797403Sobrien // with NULL buffers. At this point, we swap out the dummy NULL 15897403Sobrien // [io]stream objects and buffers with the real deal. 15997403Sobrien new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out, __out_size); 16097403Sobrien new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in, __in_size); 16197403Sobrien new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out, __out_size); 16297403Sobrien new (&cout) ostream(&buf_cout); 16397403Sobrien new (&cin) istream(&buf_cin); 16497403Sobrien new (&cerr) ostream(&buf_cerr); 16597403Sobrien new (&clog) ostream(&buf_cerr); 16697403Sobrien cin.tie(&cout); 16797403Sobrien cerr.flags(ios_base::unitbuf); 16897403Sobrien 16997403Sobrien#ifdef _GLIBCPP_USE_WCHAR_T 17097403Sobrien new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out, __out_size); 17197403Sobrien new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in, __in_size); 17297403Sobrien new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out, __out_size); 17397403Sobrien new (&wcout) wostream(&buf_wcout); 17497403Sobrien new (&wcin) wistream(&buf_wcin); 17597403Sobrien new (&wcerr) wostream(&buf_wcerr); 17697403Sobrien new (&wclog) wostream(&buf_wcerr); 17797403Sobrien wcin.tie(&wcout); 17897403Sobrien wcerr.flags(ios_base::unitbuf); 17997403Sobrien#endif 18097403Sobrien } 18197403Sobrien 18297403Sobrien void 18397403Sobrien ios_base::Init::_S_ios_destroy() 18497403Sobrien { 18597403Sobrien // Explicitly call dtors to free any memory that is dynamically 18697403Sobrien // allocated by filebuf ctor or member functions, but don't 18797403Sobrien // deallocate all memory by calling operator delete. 18897403Sobrien buf_cout.~stdio_filebuf(); 18997403Sobrien buf_cin.~stdio_filebuf(); 19097403Sobrien buf_cerr.~stdio_filebuf(); 19197403Sobrien 19297403Sobrien#ifdef _GLIBCPP_USE_WCHAR_T 19397403Sobrien buf_wcout.~stdio_filebuf(); 19497403Sobrien buf_wcin.~stdio_filebuf(); 19597403Sobrien buf_wcerr.~stdio_filebuf(); 19697403Sobrien#endif 19797403Sobrien } 19897403Sobrien 19997403Sobrien ios_base::Init::Init() 20097403Sobrien { 20197403Sobrien if (_S_ios_base_init == 0) 20297403Sobrien { 20397403Sobrien // Standard streams default to synced with "C" operations. 20497403Sobrien ios_base::Init::_S_synced_with_stdio = true; 20597403Sobrien _S_ios_create(ios_base::Init::_S_synced_with_stdio); 20697403Sobrien } 20797403Sobrien ++_S_ios_base_init; 20897403Sobrien } 20997403Sobrien 21097403Sobrien ios_base::Init::~Init() 21197403Sobrien { 21297403Sobrien if (--_S_ios_base_init == 0) 21397403Sobrien _S_ios_destroy(); 21497403Sobrien } 21597403Sobrien 21697403Sobrien // 27.4.2.5 ios_base storage functions 21797403Sobrien int 21897403Sobrien ios_base::xalloc() throw() 21997403Sobrien { 22097403Sobrien // Implementation note: Initialize top to zero to ensure that 22197403Sobrien // initialization occurs before main() is started. 22297403Sobrien static _Atomic_word _S_top = 0; 22397403Sobrien return __exchange_and_add(&_S_top, 1) + 4; 22497403Sobrien } 22597403Sobrien 22697403Sobrien // 27.4.2.5 iword/pword storage 22797403Sobrien ios_base::_Words& 22897403Sobrien ios_base::_M_grow_words(int ix) 22997403Sobrien { 23097403Sobrien // Precondition: _M_word_size <= ix 23197403Sobrien int newsize = _S_local_word_size; 23297403Sobrien _Words* words = _M_local_word; 23397403Sobrien if (ix > _S_local_word_size - 1) 23497403Sobrien { 23597403Sobrien if (ix < numeric_limits<int>::max()) 23697403Sobrien { 23797403Sobrien newsize = ix + 1; 23897403Sobrien try 23997403Sobrien { words = new _Words[newsize]; } 24097403Sobrien catch (...) 24197403Sobrien { 24297403Sobrien delete [] _M_word; 24397403Sobrien _M_word = 0; 24497403Sobrien _M_streambuf_state |= badbit; 24597403Sobrien if (_M_streambuf_state & _M_exception) 24697403Sobrien __throw_ios_failure("ios_base::_M_grow_words failure"); 24797403Sobrien return _M_word_zero; 24897403Sobrien } 24997403Sobrien for (int i = 0; i < _M_word_size; i++) 25097403Sobrien words[i] = _M_word[i]; 25197403Sobrien if (_M_word && _M_word != _M_local_word) 25297403Sobrien { 25397403Sobrien delete [] _M_word; 25497403Sobrien _M_word = 0; 25597403Sobrien } 25697403Sobrien } 25797403Sobrien else 25897403Sobrien { 25997403Sobrien _M_streambuf_state |= badbit; 26097403Sobrien return _M_word_zero; 26197403Sobrien } 26297403Sobrien } 26397403Sobrien _M_word = words; 26497403Sobrien _M_word_size = newsize; 26597403Sobrien return _M_word[ix]; 26697403Sobrien } 26797403Sobrien 26897403Sobrien // Called only by basic_ios<>::init. 26997403Sobrien void 27097403Sobrien ios_base::_M_init() 27197403Sobrien { 27297403Sobrien // NB: May be called more than once 27397403Sobrien _M_precision = 6; 27497403Sobrien _M_width = 0; 27597403Sobrien _M_flags = skipws | dec; 27697403Sobrien _M_callbacks = 0; 27797403Sobrien _M_word_size = 0; 27897403Sobrien _M_ios_locale = locale(); 27997403Sobrien } 28097403Sobrien 28197403Sobrien // 27.4.2.3 ios_base locale functions 28297403Sobrien locale 28397403Sobrien ios_base::imbue(const locale& __loc) 28497403Sobrien { 28597403Sobrien locale __old = _M_ios_locale; 28697403Sobrien _M_ios_locale = __loc; 28797403Sobrien _M_call_callbacks(imbue_event); 28897403Sobrien return __old; 28997403Sobrien } 29097403Sobrien 29197403Sobrien ios_base::ios_base() : _M_callbacks(0), _M_word(0) 29297403Sobrien { 29397403Sobrien // Do nothing: basic_ios::init() does it. 29497403Sobrien // NB: _M_callbacks and _M_word must be zero for non-initialized 29597403Sobrien // ios_base to go through ~ios_base gracefully. 29697403Sobrien } 29797403Sobrien 29897403Sobrien // 27.4.2.7 ios_base constructors/destructors 29997403Sobrien ios_base::~ios_base() 30097403Sobrien { 30197403Sobrien _M_call_callbacks(erase_event); 30297403Sobrien _M_dispose_callbacks(); 30397403Sobrien if (_M_word && _M_word != _M_local_word) 30497403Sobrien { 30597403Sobrien delete [] _M_word; 30697403Sobrien _M_word = 0; 30797403Sobrien } 30897403Sobrien } 30997403Sobrien 31097403Sobrien void 31197403Sobrien ios_base::register_callback(event_callback __fn, int __index) 31297403Sobrien { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); } 31397403Sobrien 31497403Sobrien void 31597403Sobrien ios_base::_M_call_callbacks(event __e) throw() 31697403Sobrien { 31797403Sobrien _Callback_list* __p = _M_callbacks; 31897403Sobrien while (__p) 31997403Sobrien { 32097403Sobrien try 32197403Sobrien { (*__p->_M_fn) (__e, *this, __p->_M_index); } 32297403Sobrien catch (...) 32397403Sobrien { } 32497403Sobrien __p = __p->_M_next; 32597403Sobrien } 32697403Sobrien } 32797403Sobrien 32897403Sobrien void 32997403Sobrien ios_base::_M_dispose_callbacks(void) 33097403Sobrien { 33197403Sobrien _Callback_list* __p = _M_callbacks; 33297403Sobrien while (__p && __p->_M_remove_reference() == 0) 33397403Sobrien { 33497403Sobrien _Callback_list* __next = __p->_M_next; 33597403Sobrien delete __p; 33697403Sobrien __p = __next; 33797403Sobrien } 33897403Sobrien _M_callbacks = 0; 33997403Sobrien } 34097403Sobrien 34197403Sobrien bool 34297403Sobrien ios_base::sync_with_stdio(bool __sync) 34397403Sobrien { 34497403Sobrien#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS 34597403Sobrien // 49. Underspecification of ios_base::sync_with_stdio 34697403Sobrien bool __ret = ios_base::Init::_S_synced_with_stdio; 34797403Sobrien#endif 34897403Sobrien 34997403Sobrien // Turn off sync with C FILE* for cin, cout, cerr, clog iff 35097403Sobrien // currently synchronized. 35197403Sobrien if (!__sync && __ret) 35297403Sobrien { 35397403Sobrien ios_base::Init::_S_synced_with_stdio = false; 35497403Sobrien ios_base::Init::_S_ios_destroy(); 35597403Sobrien ios_base::Init::_S_ios_create(ios_base::Init::_S_synced_with_stdio); 35697403Sobrien } 35797403Sobrien return __ret; 35897403Sobrien } 35997403Sobrien} // namespace std 360