1 // Iostreams base classes -*- C++ -*- 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 2, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // You should have received a copy of the GNU General Public License along 18 // with this library; see the file COPYING. If not, write to the Free 19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 20 // USA. 21 22 // As a special exception, you may use this file as part of a free software 23 // library without restriction. Specifically, if other files instantiate 24 // templates or use macros or inline functions from this file, or you compile 25 // this file and link it with other files to produce an executable, this 26 // file does not by itself cause the resulting executable to be covered by 27 // the GNU General Public License. This exception does not however 28 // invalidate any other reasons why the executable file might be covered by 29 // the GNU General Public License. 30 31 // 32 // ISO C++ 14882: 27.4 Iostreams base classes 33 // 34 35 #include <ios> 36 #include <ostream> 37 #include <istream> 38 #include <fstream> 39 #include <bits/atomicity.h> 40 #include <ext/stdio_filebuf.h> 41 #ifdef _GLIBCPP_HAVE_UNISTD_H 42 #include <unistd.h> 43 #endif 44 45 namespace __gnu_cxx 46 { 47 // Extern declarations for global objects in src/globals.cc. 48 extern stdio_filebuf<char> buf_cout; 49 extern stdio_filebuf<char> buf_cin; 50 extern stdio_filebuf<char> buf_cerr; 51 52 #if defined(_GLIBCPP_USE_WCHAR_T) || defined(_GLIBCPP_USE_TYPE_WCHAR_T) 53 extern stdio_filebuf<wchar_t> buf_wcout; 54 extern stdio_filebuf<wchar_t> buf_wcin; 55 extern stdio_filebuf<wchar_t> buf_wcerr; 56 #endif 57 } // namespace __gnu_cxx 58 59 namespace std 60 { 61 using namespace __gnu_cxx; 62 63 extern istream cin; 64 extern ostream cout; 65 extern ostream cerr; 66 extern ostream clog; 67 68 #if defined(_GLIBCPP_USE_WCHAR_T) || defined(_GLIBCPP_USE_TYPE_WCHAR_T) 69 extern wistream wcin; 70 extern wostream wcout; 71 extern wostream wcerr; 72 extern wostream wclog; 73 #endif 74 75 // Definitions for static const data members of __ios_flags. 76 const __ios_flags::__int_type __ios_flags::_S_boolalpha; 77 const __ios_flags::__int_type __ios_flags::_S_dec; 78 const __ios_flags::__int_type __ios_flags::_S_fixed; 79 const __ios_flags::__int_type __ios_flags::_S_hex; 80 const __ios_flags::__int_type __ios_flags::_S_internal; 81 const __ios_flags::__int_type __ios_flags::_S_left; 82 const __ios_flags::__int_type __ios_flags::_S_oct; 83 const __ios_flags::__int_type __ios_flags::_S_right; 84 const __ios_flags::__int_type __ios_flags::_S_scientific; 85 const __ios_flags::__int_type __ios_flags::_S_showbase; 86 const __ios_flags::__int_type __ios_flags::_S_showpoint; 87 const __ios_flags::__int_type __ios_flags::_S_showpos; 88 const __ios_flags::__int_type __ios_flags::_S_skipws; 89 const __ios_flags::__int_type __ios_flags::_S_unitbuf; 90 const __ios_flags::__int_type __ios_flags::_S_uppercase; 91 const __ios_flags::__int_type __ios_flags::_S_adjustfield; 92 const __ios_flags::__int_type __ios_flags::_S_basefield; 93 const __ios_flags::__int_type __ios_flags::_S_floatfield; 94 95 const __ios_flags::__int_type __ios_flags::_S_badbit; 96 const __ios_flags::__int_type __ios_flags::_S_eofbit; 97 const __ios_flags::__int_type __ios_flags::_S_failbit; 98 99 const __ios_flags::__int_type __ios_flags::_S_app; 100 const __ios_flags::__int_type __ios_flags::_S_ate; 101 const __ios_flags::__int_type __ios_flags::_S_bin; 102 const __ios_flags::__int_type __ios_flags::_S_in; 103 const __ios_flags::__int_type __ios_flags::_S_out; 104 const __ios_flags::__int_type __ios_flags::_S_trunc; 105 106 // Definitions for static const members of ios_base. 107 const ios_base::fmtflags ios_base::boolalpha; 108 const ios_base::fmtflags ios_base::dec; 109 const ios_base::fmtflags ios_base::fixed; 110 const ios_base::fmtflags ios_base::hex; 111 const ios_base::fmtflags ios_base::internal; 112 const ios_base::fmtflags ios_base::left; 113 const ios_base::fmtflags ios_base::oct; 114 const ios_base::fmtflags ios_base::right; 115 const ios_base::fmtflags ios_base::scientific; 116 const ios_base::fmtflags ios_base::showbase; 117 const ios_base::fmtflags ios_base::showpoint; 118 const ios_base::fmtflags ios_base::showpos; 119 const ios_base::fmtflags ios_base::skipws; 120 const ios_base::fmtflags ios_base::unitbuf; 121 const ios_base::fmtflags ios_base::uppercase; 122 const ios_base::fmtflags ios_base::adjustfield; 123 const ios_base::fmtflags ios_base::basefield; 124 const ios_base::fmtflags ios_base::floatfield; 125 126 const ios_base::iostate ios_base::badbit; 127 const ios_base::iostate ios_base::eofbit; 128 const ios_base::iostate ios_base::failbit; 129 const ios_base::iostate ios_base::goodbit; 130 131 const ios_base::openmode ios_base::app; 132 const ios_base::openmode ios_base::ate; 133 const ios_base::openmode ios_base::binary; 134 const ios_base::openmode ios_base::in; 135 const ios_base::openmode ios_base::out; 136 const ios_base::openmode ios_base::trunc; 137 138 const ios_base::seekdir ios_base::beg; 139 const ios_base::seekdir ios_base::cur; 140 const ios_base::seekdir ios_base::end; 141 142 const int ios_base::_S_local_word_size; 143 int ios_base::Init::_S_ios_base_init = 0; 144 bool ios_base::Init::_S_synced_with_stdio = true; 145 failure(const string & __str)146 ios_base::failure::failure(const string& __str) throw() 147 { 148 strncpy(_M_name, __str.c_str(), _M_bufsize); 149 _M_name[_M_bufsize - 1] = '\0'; 150 } 151 ~failure()152 ios_base::failure::~failure() throw() 153 { } 154 155 const char* what() const156 ios_base::failure::what() const throw() 157 { return _M_name; } 158 159 void _S_ios_create(bool __sync)160 ios_base::Init::_S_ios_create(bool __sync) 161 { 162 size_t __out_size = __sync ? 0 : static_cast<size_t>(BUFSIZ); 163 #ifdef _GLIBCPP_HAVE_ISATTY 164 size_t __in_size = 165 (__sync || isatty (0)) ? 1 : static_cast<size_t>(BUFSIZ); 166 #else 167 size_t __in_size = 1; 168 #endif 169 170 // NB: The file globals.cc creates the four standard files 171 // with NULL buffers. At this point, we swap out the dummy NULL 172 // [io]stream objects and buffers with the real deal. 173 new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out, __out_size); 174 new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in, __in_size); 175 new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out, __out_size); 176 177 new (&cout) ostream(&buf_cout); 178 new (&cin) istream(&buf_cin); 179 new (&cerr) ostream(&buf_cerr); 180 new (&clog) ostream(&buf_cerr); 181 cout.init(&buf_cout); 182 cin.init(&buf_cin); 183 cerr.init(&buf_cerr); 184 clog.init(&buf_cerr); 185 cin.tie(&cout); 186 cerr.flags(ios_base::unitbuf); 187 188 #if defined(_GLIBCPP_USE_WCHAR_T) || defined(_GLIBCPP_USE_TYPE_WCHAR_T) 189 new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out, __out_size); 190 new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in, __in_size); 191 new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out, __out_size); 192 new (&wcout) wostream(&buf_wcout); 193 new (&wcin) wistream(&buf_wcin); 194 new (&wcerr) wostream(&buf_wcerr); 195 new (&wclog) wostream(&buf_wcerr); 196 wcout.init(&buf_wcout); 197 wcin.init(&buf_wcin); 198 wcerr.init(&buf_wcerr); 199 wclog.init(&buf_wcerr); 200 wcin.tie(&wcout); 201 wcerr.flags(ios_base::unitbuf); 202 #endif 203 } 204 205 void _S_ios_destroy()206 ios_base::Init::_S_ios_destroy() 207 { 208 // Explicitly call dtors to free any memory that is dynamically 209 // allocated by filebuf ctor or member functions, but don't 210 // deallocate all memory by calling operator delete. 211 buf_cout.~stdio_filebuf(); 212 buf_cin.~stdio_filebuf(); 213 buf_cerr.~stdio_filebuf(); 214 215 #if defined(_GLIBCPP_USE_WCHAR_T) || defined(_GLIBCPP_USE_TYPE_WCHAR_T) 216 buf_wcout.~stdio_filebuf(); 217 buf_wcin.~stdio_filebuf(); 218 buf_wcerr.~stdio_filebuf(); 219 #endif 220 } 221 Init()222 ios_base::Init::Init() 223 { 224 if (_S_ios_base_init == 0) 225 { 226 // Standard streams default to synced with "C" operations. 227 ios_base::Init::_S_synced_with_stdio = true; 228 _S_ios_create(ios_base::Init::_S_synced_with_stdio); 229 } 230 ++_S_ios_base_init; 231 } 232 ~Init()233 ios_base::Init::~Init() 234 { 235 if (--_S_ios_base_init == 0) 236 _S_ios_destroy(); 237 } 238 239 // 27.4.2.5 ios_base storage functions 240 int xalloc()241 ios_base::xalloc() throw() 242 { 243 // Implementation note: Initialize top to zero to ensure that 244 // initialization occurs before main() is started. 245 static _Atomic_word _S_top = 0; 246 return __exchange_and_add(&_S_top, 1) + 4; 247 } 248 249 // 27.4.2.5 iword/pword storage 250 ios_base::_Words& _M_grow_words(int ix)251 ios_base::_M_grow_words(int ix) 252 { 253 // Precondition: _M_word_size <= ix 254 int newsize = _S_local_word_size; 255 _Words* words = _M_local_word; 256 if (ix > _S_local_word_size - 1) 257 { 258 if (ix < numeric_limits<int>::max()) 259 { 260 newsize = ix + 1; 261 try 262 { words = new _Words[newsize]; } 263 catch (...) 264 { 265 _M_streambuf_state |= badbit; 266 if (_M_streambuf_state & _M_exception) 267 __throw_ios_failure("ios_base::_M_grow_words failure"); 268 return _M_word_zero; 269 } 270 for (int i = 0; i < _M_word_size; i++) 271 words[i] = _M_word[i]; 272 if (_M_word && _M_word != _M_local_word) 273 { 274 delete [] _M_word; 275 _M_word = 0; 276 } 277 } 278 else 279 { 280 _M_streambuf_state |= badbit; 281 if (_M_streambuf_state & _M_exception) 282 __throw_ios_failure("ios_base::_M_grow_words failure"); 283 return _M_word_zero; 284 } 285 } 286 _M_word = words; 287 _M_word_size = newsize; 288 return _M_word[ix]; 289 } 290 291 // Called only by basic_ios<>::init. 292 void _M_init()293 ios_base::_M_init() 294 { 295 // NB: May be called more than once 296 _M_precision = 6; 297 _M_width = 0; 298 _M_flags = skipws | dec; 299 _M_ios_locale = locale(); 300 } 301 302 // 27.4.2.3 ios_base locale functions 303 locale imbue(const locale & __loc)304 ios_base::imbue(const locale& __loc) 305 { 306 locale __old = _M_ios_locale; 307 _M_ios_locale = __loc; 308 _M_call_callbacks(imbue_event); 309 return __old; 310 } 311 ios_base()312 ios_base::ios_base() : _M_callbacks(0), _M_word_size(_S_local_word_size), 313 _M_word(_M_local_word) 314 { 315 // Do nothing: basic_ios::init() does it. 316 // NB: _M_callbacks and _M_word must be zero for non-initialized 317 // ios_base to go through ~ios_base gracefully. 318 } 319 320 // 27.4.2.7 ios_base constructors/destructors ~ios_base()321 ios_base::~ios_base() 322 { 323 _M_call_callbacks(erase_event); 324 _M_dispose_callbacks(); 325 if (_M_word != _M_local_word) 326 { 327 delete [] _M_word; 328 _M_word = 0; 329 } 330 } 331 332 void register_callback(event_callback __fn,int __index)333 ios_base::register_callback(event_callback __fn, int __index) 334 { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); } 335 336 void _M_call_callbacks(event __e)337 ios_base::_M_call_callbacks(event __e) throw() 338 { 339 _Callback_list* __p = _M_callbacks; 340 while (__p) 341 { 342 try 343 { (*__p->_M_fn) (__e, *this, __p->_M_index); } 344 catch (...) 345 { } 346 __p = __p->_M_next; 347 } 348 } 349 350 void _M_dispose_callbacks(void)351 ios_base::_M_dispose_callbacks(void) 352 { 353 _Callback_list* __p = _M_callbacks; 354 while (__p && __p->_M_remove_reference() == 0) 355 { 356 _Callback_list* __next = __p->_M_next; 357 delete __p; 358 __p = __next; 359 } 360 _M_callbacks = 0; 361 } 362 363 bool sync_with_stdio(bool __sync)364 ios_base::sync_with_stdio(bool __sync) 365 { 366 #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS 367 // 49. Underspecification of ios_base::sync_with_stdio 368 bool __ret = ios_base::Init::_S_synced_with_stdio; 369 #endif 370 371 // Turn off sync with C FILE* for cin, cout, cerr, clog iff 372 // currently synchronized. 373 if (!__sync && __ret) 374 { 375 ios_base::Init::_S_synced_with_stdio = false; 376 ios_base::Init::_S_ios_destroy(); 377 ios_base::Init::_S_ios_create(ios_base::Init::_S_synced_with_stdio); 378 } 379 return __ret; 380 } 381 } // namespace std 382