ios.cc revision 117397
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> 41110614Skan#ifdef _GLIBCPP_HAVE_UNISTD_H 42110614Skan#include <unistd.h> 43110614Skan#endif 4497403Sobrien 45107606Sobriennamespace __gnu_cxx 46107606Sobrien{ 47107606Sobrien // Extern declarations for global objects in src/globals.cc. 48107606Sobrien extern stdio_filebuf<char> buf_cout; 49107606Sobrien extern stdio_filebuf<char> buf_cin; 50107606Sobrien extern stdio_filebuf<char> buf_cerr; 51107606Sobrien 52107606Sobrien#ifdef _GLIBCPP_USE_WCHAR_T 53107606Sobrien extern stdio_filebuf<wchar_t> buf_wcout; 54107606Sobrien extern stdio_filebuf<wchar_t> buf_wcin; 55107606Sobrien extern stdio_filebuf<wchar_t> buf_wcerr; 56107606Sobrien#endif 57107606Sobrien} // namespace __gnu_cxx 58107606Sobrien 5997403Sobriennamespace std 6097403Sobrien{ 61107606Sobrien using namespace __gnu_cxx; 62107606Sobrien 6397403Sobrien extern istream cin; 6497403Sobrien extern ostream cout; 6597403Sobrien extern ostream cerr; 6697403Sobrien extern ostream clog; 6797403Sobrien 6897403Sobrien#ifdef _GLIBCPP_USE_WCHAR_T 6997403Sobrien extern wistream wcin; 7097403Sobrien extern wostream wcout; 7197403Sobrien extern wostream wcerr; 7297403Sobrien extern wostream wclog; 7397403Sobrien#endif 7497403Sobrien 7597403Sobrien // Definitions for static const data members of __ios_flags. 7697403Sobrien const __ios_flags::__int_type __ios_flags::_S_boolalpha; 7797403Sobrien const __ios_flags::__int_type __ios_flags::_S_dec; 7897403Sobrien const __ios_flags::__int_type __ios_flags::_S_fixed; 7997403Sobrien const __ios_flags::__int_type __ios_flags::_S_hex; 8097403Sobrien const __ios_flags::__int_type __ios_flags::_S_internal; 8197403Sobrien const __ios_flags::__int_type __ios_flags::_S_left; 8297403Sobrien const __ios_flags::__int_type __ios_flags::_S_oct; 8397403Sobrien const __ios_flags::__int_type __ios_flags::_S_right; 8497403Sobrien const __ios_flags::__int_type __ios_flags::_S_scientific; 8597403Sobrien const __ios_flags::__int_type __ios_flags::_S_showbase; 8697403Sobrien const __ios_flags::__int_type __ios_flags::_S_showpoint; 8797403Sobrien const __ios_flags::__int_type __ios_flags::_S_showpos; 8897403Sobrien const __ios_flags::__int_type __ios_flags::_S_skipws; 8997403Sobrien const __ios_flags::__int_type __ios_flags::_S_unitbuf; 9097403Sobrien const __ios_flags::__int_type __ios_flags::_S_uppercase; 9197403Sobrien const __ios_flags::__int_type __ios_flags::_S_adjustfield; 9297403Sobrien const __ios_flags::__int_type __ios_flags::_S_basefield; 9397403Sobrien const __ios_flags::__int_type __ios_flags::_S_floatfield; 9497403Sobrien 9597403Sobrien const __ios_flags::__int_type __ios_flags::_S_badbit; 9697403Sobrien const __ios_flags::__int_type __ios_flags::_S_eofbit; 9797403Sobrien const __ios_flags::__int_type __ios_flags::_S_failbit; 9897403Sobrien 9997403Sobrien const __ios_flags::__int_type __ios_flags::_S_app; 10097403Sobrien const __ios_flags::__int_type __ios_flags::_S_ate; 10197403Sobrien const __ios_flags::__int_type __ios_flags::_S_bin; 10297403Sobrien const __ios_flags::__int_type __ios_flags::_S_in; 10397403Sobrien const __ios_flags::__int_type __ios_flags::_S_out; 10497403Sobrien const __ios_flags::__int_type __ios_flags::_S_trunc; 10597403Sobrien 10697403Sobrien // Definitions for static const members of ios_base. 10797403Sobrien const ios_base::fmtflags ios_base::boolalpha; 10897403Sobrien const ios_base::fmtflags ios_base::dec; 10997403Sobrien const ios_base::fmtflags ios_base::fixed; 11097403Sobrien const ios_base::fmtflags ios_base::hex; 11197403Sobrien const ios_base::fmtflags ios_base::internal; 11297403Sobrien const ios_base::fmtflags ios_base::left; 11397403Sobrien const ios_base::fmtflags ios_base::oct; 11497403Sobrien const ios_base::fmtflags ios_base::right; 11597403Sobrien const ios_base::fmtflags ios_base::scientific; 11697403Sobrien const ios_base::fmtflags ios_base::showbase; 11797403Sobrien const ios_base::fmtflags ios_base::showpoint; 11897403Sobrien const ios_base::fmtflags ios_base::showpos; 11997403Sobrien const ios_base::fmtflags ios_base::skipws; 12097403Sobrien const ios_base::fmtflags ios_base::unitbuf; 12197403Sobrien const ios_base::fmtflags ios_base::uppercase; 12297403Sobrien const ios_base::fmtflags ios_base::adjustfield; 12397403Sobrien const ios_base::fmtflags ios_base::basefield; 12497403Sobrien const ios_base::fmtflags ios_base::floatfield; 12597403Sobrien 12697403Sobrien const ios_base::iostate ios_base::badbit; 12797403Sobrien const ios_base::iostate ios_base::eofbit; 12897403Sobrien const ios_base::iostate ios_base::failbit; 12997403Sobrien const ios_base::iostate ios_base::goodbit; 13097403Sobrien 13197403Sobrien const ios_base::openmode ios_base::app; 13297403Sobrien const ios_base::openmode ios_base::ate; 13397403Sobrien const ios_base::openmode ios_base::binary; 13497403Sobrien const ios_base::openmode ios_base::in; 13597403Sobrien const ios_base::openmode ios_base::out; 13697403Sobrien const ios_base::openmode ios_base::trunc; 13797403Sobrien 13897403Sobrien const ios_base::seekdir ios_base::beg; 13997403Sobrien const ios_base::seekdir ios_base::cur; 14097403Sobrien const ios_base::seekdir ios_base::end; 14197403Sobrien 14297403Sobrien const int ios_base::_S_local_word_size; 14397403Sobrien int ios_base::Init::_S_ios_base_init = 0; 14497403Sobrien bool ios_base::Init::_S_synced_with_stdio = true; 14597403Sobrien 14697403Sobrien ios_base::failure::failure(const string& __str) throw() 14797403Sobrien { 14897403Sobrien strncpy(_M_name, __str.c_str(), _M_bufsize); 14997403Sobrien _M_name[_M_bufsize - 1] = '\0'; 15097403Sobrien } 15197403Sobrien 15297403Sobrien ios_base::failure::~failure() throw() 15397403Sobrien { } 15497403Sobrien 15597403Sobrien const char* 15697403Sobrien ios_base::failure::what() const throw() 15797403Sobrien { return _M_name; } 15897403Sobrien 15997403Sobrien void 16097403Sobrien ios_base::Init::_S_ios_create(bool __sync) 16197403Sobrien { 162117397Skan size_t __out_size = __sync ? 0 : static_cast<size_t>(BUFSIZ); 163110614Skan#ifdef _GLIBCPP_HAVE_ISATTY 164117397Skan size_t __in_size = 165117397Skan (__sync || isatty (0)) ? 1 : static_cast<size_t>(BUFSIZ); 166110614Skan#else 167117397Skan size_t __in_size = 1; 168110614Skan#endif 16997403Sobrien 17097403Sobrien // NB: The file globals.cc creates the four standard files 17197403Sobrien // with NULL buffers. At this point, we swap out the dummy NULL 17297403Sobrien // [io]stream objects and buffers with the real deal. 17397403Sobrien new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out, __out_size); 17497403Sobrien new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in, __in_size); 17597403Sobrien new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out, __out_size); 176117397Skan 17797403Sobrien new (&cout) ostream(&buf_cout); 17897403Sobrien new (&cin) istream(&buf_cin); 17997403Sobrien new (&cerr) ostream(&buf_cerr); 18097403Sobrien new (&clog) ostream(&buf_cerr); 181117397Skan cout.init(&buf_cout); 182117397Skan cin.init(&buf_cin); 183117397Skan cerr.init(&buf_cerr); 184117397Skan clog.init(&buf_cerr); 18597403Sobrien cin.tie(&cout); 18697403Sobrien cerr.flags(ios_base::unitbuf); 18797403Sobrien 18897403Sobrien#ifdef _GLIBCPP_USE_WCHAR_T 18997403Sobrien new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out, __out_size); 19097403Sobrien new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in, __in_size); 19197403Sobrien new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out, __out_size); 19297403Sobrien new (&wcout) wostream(&buf_wcout); 19397403Sobrien new (&wcin) wistream(&buf_wcin); 19497403Sobrien new (&wcerr) wostream(&buf_wcerr); 19597403Sobrien new (&wclog) wostream(&buf_wcerr); 196117397Skan wcout.init(&buf_wcout); 197117397Skan wcin.init(&buf_wcin); 198117397Skan wcerr.init(&buf_wcerr); 199117397Skan wclog.init(&buf_wcerr); 20097403Sobrien wcin.tie(&wcout); 20197403Sobrien wcerr.flags(ios_base::unitbuf); 20297403Sobrien#endif 20397403Sobrien } 20497403Sobrien 20597403Sobrien void 20697403Sobrien ios_base::Init::_S_ios_destroy() 20797403Sobrien { 20897403Sobrien // Explicitly call dtors to free any memory that is dynamically 20997403Sobrien // allocated by filebuf ctor or member functions, but don't 21097403Sobrien // deallocate all memory by calling operator delete. 21197403Sobrien buf_cout.~stdio_filebuf(); 21297403Sobrien buf_cin.~stdio_filebuf(); 21397403Sobrien buf_cerr.~stdio_filebuf(); 21497403Sobrien 21597403Sobrien#ifdef _GLIBCPP_USE_WCHAR_T 21697403Sobrien buf_wcout.~stdio_filebuf(); 21797403Sobrien buf_wcin.~stdio_filebuf(); 21897403Sobrien buf_wcerr.~stdio_filebuf(); 21997403Sobrien#endif 22097403Sobrien } 22197403Sobrien 22297403Sobrien ios_base::Init::Init() 22397403Sobrien { 22497403Sobrien if (_S_ios_base_init == 0) 22597403Sobrien { 22697403Sobrien // Standard streams default to synced with "C" operations. 22797403Sobrien ios_base::Init::_S_synced_with_stdio = true; 22897403Sobrien _S_ios_create(ios_base::Init::_S_synced_with_stdio); 22997403Sobrien } 23097403Sobrien ++_S_ios_base_init; 23197403Sobrien } 23297403Sobrien 23397403Sobrien ios_base::Init::~Init() 23497403Sobrien { 23597403Sobrien if (--_S_ios_base_init == 0) 23697403Sobrien _S_ios_destroy(); 23797403Sobrien } 23897403Sobrien 23997403Sobrien // 27.4.2.5 ios_base storage functions 24097403Sobrien int 24197403Sobrien ios_base::xalloc() throw() 24297403Sobrien { 24397403Sobrien // Implementation note: Initialize top to zero to ensure that 24497403Sobrien // initialization occurs before main() is started. 24597403Sobrien static _Atomic_word _S_top = 0; 24697403Sobrien return __exchange_and_add(&_S_top, 1) + 4; 24797403Sobrien } 24897403Sobrien 24997403Sobrien // 27.4.2.5 iword/pword storage 25097403Sobrien ios_base::_Words& 25197403Sobrien ios_base::_M_grow_words(int ix) 25297403Sobrien { 25397403Sobrien // Precondition: _M_word_size <= ix 25497403Sobrien int newsize = _S_local_word_size; 25597403Sobrien _Words* words = _M_local_word; 25697403Sobrien if (ix > _S_local_word_size - 1) 25797403Sobrien { 25897403Sobrien if (ix < numeric_limits<int>::max()) 25997403Sobrien { 26097403Sobrien newsize = ix + 1; 26197403Sobrien try 26297403Sobrien { words = new _Words[newsize]; } 26397403Sobrien catch (...) 26497403Sobrien { 26597403Sobrien _M_streambuf_state |= badbit; 26697403Sobrien if (_M_streambuf_state & _M_exception) 26797403Sobrien __throw_ios_failure("ios_base::_M_grow_words failure"); 26897403Sobrien return _M_word_zero; 26997403Sobrien } 27097403Sobrien for (int i = 0; i < _M_word_size; i++) 27197403Sobrien words[i] = _M_word[i]; 27297403Sobrien if (_M_word && _M_word != _M_local_word) 27397403Sobrien { 27497403Sobrien delete [] _M_word; 27597403Sobrien _M_word = 0; 27697403Sobrien } 27797403Sobrien } 27897403Sobrien else 27997403Sobrien { 28097403Sobrien _M_streambuf_state |= badbit; 281117397Skan if (_M_streambuf_state & _M_exception) 282117397Skan __throw_ios_failure("ios_base::_M_grow_words failure"); 28397403Sobrien return _M_word_zero; 28497403Sobrien } 28597403Sobrien } 28697403Sobrien _M_word = words; 28797403Sobrien _M_word_size = newsize; 28897403Sobrien return _M_word[ix]; 28997403Sobrien } 29097403Sobrien 29197403Sobrien // Called only by basic_ios<>::init. 29297403Sobrien void 29397403Sobrien ios_base::_M_init() 29497403Sobrien { 29597403Sobrien // NB: May be called more than once 29697403Sobrien _M_precision = 6; 29797403Sobrien _M_width = 0; 29897403Sobrien _M_flags = skipws | dec; 29997403Sobrien _M_ios_locale = locale(); 30097403Sobrien } 30197403Sobrien 30297403Sobrien // 27.4.2.3 ios_base locale functions 30397403Sobrien locale 30497403Sobrien ios_base::imbue(const locale& __loc) 30597403Sobrien { 30697403Sobrien locale __old = _M_ios_locale; 30797403Sobrien _M_ios_locale = __loc; 30897403Sobrien _M_call_callbacks(imbue_event); 30997403Sobrien return __old; 31097403Sobrien } 31197403Sobrien 312117397Skan ios_base::ios_base() : _M_callbacks(0), _M_word_size(_S_local_word_size), 313117397Skan _M_word(_M_local_word) 31497403Sobrien { 31597403Sobrien // Do nothing: basic_ios::init() does it. 31697403Sobrien // NB: _M_callbacks and _M_word must be zero for non-initialized 31797403Sobrien // ios_base to go through ~ios_base gracefully. 31897403Sobrien } 31997403Sobrien 32097403Sobrien // 27.4.2.7 ios_base constructors/destructors 32197403Sobrien ios_base::~ios_base() 32297403Sobrien { 32397403Sobrien _M_call_callbacks(erase_event); 32497403Sobrien _M_dispose_callbacks(); 325117397Skan if (_M_word != _M_local_word) 32697403Sobrien { 32797403Sobrien delete [] _M_word; 32897403Sobrien _M_word = 0; 32997403Sobrien } 33097403Sobrien } 33197403Sobrien 33297403Sobrien void 33397403Sobrien ios_base::register_callback(event_callback __fn, int __index) 33497403Sobrien { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); } 33597403Sobrien 33697403Sobrien void 33797403Sobrien ios_base::_M_call_callbacks(event __e) throw() 33897403Sobrien { 33997403Sobrien _Callback_list* __p = _M_callbacks; 34097403Sobrien while (__p) 34197403Sobrien { 34297403Sobrien try 34397403Sobrien { (*__p->_M_fn) (__e, *this, __p->_M_index); } 34497403Sobrien catch (...) 34597403Sobrien { } 34697403Sobrien __p = __p->_M_next; 34797403Sobrien } 34897403Sobrien } 34997403Sobrien 35097403Sobrien void 35197403Sobrien ios_base::_M_dispose_callbacks(void) 35297403Sobrien { 35397403Sobrien _Callback_list* __p = _M_callbacks; 35497403Sobrien while (__p && __p->_M_remove_reference() == 0) 35597403Sobrien { 35697403Sobrien _Callback_list* __next = __p->_M_next; 35797403Sobrien delete __p; 35897403Sobrien __p = __next; 35997403Sobrien } 36097403Sobrien _M_callbacks = 0; 36197403Sobrien } 36297403Sobrien 36397403Sobrien bool 36497403Sobrien ios_base::sync_with_stdio(bool __sync) 36597403Sobrien { 36697403Sobrien#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS 36797403Sobrien // 49. Underspecification of ios_base::sync_with_stdio 36897403Sobrien bool __ret = ios_base::Init::_S_synced_with_stdio; 36997403Sobrien#endif 37097403Sobrien 37197403Sobrien // Turn off sync with C FILE* for cin, cout, cerr, clog iff 37297403Sobrien // currently synchronized. 37397403Sobrien if (!__sync && __ret) 37497403Sobrien { 37597403Sobrien ios_base::Init::_S_synced_with_stdio = false; 37697403Sobrien ios_base::Init::_S_ios_destroy(); 37797403Sobrien ios_base::Init::_S_ios_create(ios_base::Init::_S_synced_with_stdio); 37897403Sobrien } 37997403Sobrien return __ret; 38097403Sobrien } 38197403Sobrien} // namespace std 382