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 42 namespace __gnu_cxx 43 { 44 // Extern declarations for global objects in src/globals.cc. 45 extern stdio_filebuf<char> buf_cout; 46 extern stdio_filebuf<char> buf_cin; 47 extern stdio_filebuf<char> buf_cerr; 48 49 #ifdef _GLIBCPP_USE_WCHAR_T 50 extern stdio_filebuf<wchar_t> buf_wcout; 51 extern stdio_filebuf<wchar_t> buf_wcin; 52 extern stdio_filebuf<wchar_t> buf_wcerr; 53 #endif 54 } // namespace __gnu_cxx 55 56 namespace std 57 { 58 using namespace __gnu_cxx; 59 60 extern istream cin; 61 extern ostream cout; 62 extern ostream cerr; 63 extern ostream clog; 64 65 #ifdef _GLIBCPP_USE_WCHAR_T 66 extern wistream wcin; 67 extern wostream wcout; 68 extern wostream wcerr; 69 extern wostream wclog; 70 #endif 71 72 // Definitions for static const data members of __ios_flags. 73 const __ios_flags::__int_type __ios_flags::_S_boolalpha; 74 const __ios_flags::__int_type __ios_flags::_S_dec; 75 const __ios_flags::__int_type __ios_flags::_S_fixed; 76 const __ios_flags::__int_type __ios_flags::_S_hex; 77 const __ios_flags::__int_type __ios_flags::_S_internal; 78 const __ios_flags::__int_type __ios_flags::_S_left; 79 const __ios_flags::__int_type __ios_flags::_S_oct; 80 const __ios_flags::__int_type __ios_flags::_S_right; 81 const __ios_flags::__int_type __ios_flags::_S_scientific; 82 const __ios_flags::__int_type __ios_flags::_S_showbase; 83 const __ios_flags::__int_type __ios_flags::_S_showpoint; 84 const __ios_flags::__int_type __ios_flags::_S_showpos; 85 const __ios_flags::__int_type __ios_flags::_S_skipws; 86 const __ios_flags::__int_type __ios_flags::_S_unitbuf; 87 const __ios_flags::__int_type __ios_flags::_S_uppercase; 88 const __ios_flags::__int_type __ios_flags::_S_adjustfield; 89 const __ios_flags::__int_type __ios_flags::_S_basefield; 90 const __ios_flags::__int_type __ios_flags::_S_floatfield; 91 92 const __ios_flags::__int_type __ios_flags::_S_badbit; 93 const __ios_flags::__int_type __ios_flags::_S_eofbit; 94 const __ios_flags::__int_type __ios_flags::_S_failbit; 95 96 const __ios_flags::__int_type __ios_flags::_S_app; 97 const __ios_flags::__int_type __ios_flags::_S_ate; 98 const __ios_flags::__int_type __ios_flags::_S_bin; 99 const __ios_flags::__int_type __ios_flags::_S_in; 100 const __ios_flags::__int_type __ios_flags::_S_out; 101 const __ios_flags::__int_type __ios_flags::_S_trunc; 102 103 // Definitions for static const members of ios_base. 104 const ios_base::fmtflags ios_base::boolalpha; 105 const ios_base::fmtflags ios_base::dec; 106 const ios_base::fmtflags ios_base::fixed; 107 const ios_base::fmtflags ios_base::hex; 108 const ios_base::fmtflags ios_base::internal; 109 const ios_base::fmtflags ios_base::left; 110 const ios_base::fmtflags ios_base::oct; 111 const ios_base::fmtflags ios_base::right; 112 const ios_base::fmtflags ios_base::scientific; 113 const ios_base::fmtflags ios_base::showbase; 114 const ios_base::fmtflags ios_base::showpoint; 115 const ios_base::fmtflags ios_base::showpos; 116 const ios_base::fmtflags ios_base::skipws; 117 const ios_base::fmtflags ios_base::unitbuf; 118 const ios_base::fmtflags ios_base::uppercase; 119 const ios_base::fmtflags ios_base::adjustfield; 120 const ios_base::fmtflags ios_base::basefield; 121 const ios_base::fmtflags ios_base::floatfield; 122 123 const ios_base::iostate ios_base::badbit; 124 const ios_base::iostate ios_base::eofbit; 125 const ios_base::iostate ios_base::failbit; 126 const ios_base::iostate ios_base::goodbit; 127 128 const ios_base::openmode ios_base::app; 129 const ios_base::openmode ios_base::ate; 130 const ios_base::openmode ios_base::binary; 131 const ios_base::openmode ios_base::in; 132 const ios_base::openmode ios_base::out; 133 const ios_base::openmode ios_base::trunc; 134 135 const ios_base::seekdir ios_base::beg; 136 const ios_base::seekdir ios_base::cur; 137 const ios_base::seekdir ios_base::end; 138 139 const int ios_base::_S_local_word_size; 140 int ios_base::Init::_S_ios_base_init = 0; 141 bool ios_base::Init::_S_synced_with_stdio = true; 142 143 ios_base::failure::failure(const string& __str) throw() 144 { 145 strncpy(_M_name, __str.c_str(), _M_bufsize); 146 _M_name[_M_bufsize - 1] = '\0'; 147 } 148 149 ios_base::failure::~failure() throw() 150 { } 151 152 const char* 153 ios_base::failure::what() const throw() 154 { return _M_name; } 155 156 void 157 ios_base::Init::_S_ios_create(bool __sync) 158 { 159 int __out_size = __sync ? 0 : static_cast<int>(BUFSIZ); 160 int __in_size = __sync ? 1 : static_cast<int>(BUFSIZ); 161 162 // NB: The file globals.cc creates the four standard files 163 // with NULL buffers. At this point, we swap out the dummy NULL 164 // [io]stream objects and buffers with the real deal. 165 new (&buf_cout) stdio_filebuf<char>(stdout, ios_base::out, __out_size); 166 new (&buf_cin) stdio_filebuf<char>(stdin, ios_base::in, __in_size); 167 new (&buf_cerr) stdio_filebuf<char>(stderr, ios_base::out, __out_size); 168 new (&cout) ostream(&buf_cout); 169 new (&cin) istream(&buf_cin); 170 new (&cerr) ostream(&buf_cerr); 171 new (&clog) ostream(&buf_cerr); 172 cin.tie(&cout); 173 cerr.flags(ios_base::unitbuf); 174 175 #ifdef _GLIBCPP_USE_WCHAR_T 176 new (&buf_wcout) stdio_filebuf<wchar_t>(stdout, ios_base::out, __out_size); 177 new (&buf_wcin) stdio_filebuf<wchar_t>(stdin, ios_base::in, __in_size); 178 new (&buf_wcerr) stdio_filebuf<wchar_t>(stderr, ios_base::out, __out_size); 179 new (&wcout) wostream(&buf_wcout); 180 new (&wcin) wistream(&buf_wcin); 181 new (&wcerr) wostream(&buf_wcerr); 182 new (&wclog) wostream(&buf_wcerr); 183 wcin.tie(&wcout); 184 wcerr.flags(ios_base::unitbuf); 185 #endif 186 } 187 188 void 189 ios_base::Init::_S_ios_destroy() 190 { 191 // Explicitly call dtors to free any memory that is dynamically 192 // allocated by filebuf ctor or member functions, but don't 193 // deallocate all memory by calling operator delete. 194 buf_cout.~stdio_filebuf(); 195 buf_cin.~stdio_filebuf(); 196 buf_cerr.~stdio_filebuf(); 197 198 #ifdef _GLIBCPP_USE_WCHAR_T 199 buf_wcout.~stdio_filebuf(); 200 buf_wcin.~stdio_filebuf(); 201 buf_wcerr.~stdio_filebuf(); 202 #endif 203 } 204 205 ios_base::Init::Init() 206 { 207 if (_S_ios_base_init == 0) 208 { 209 // Standard streams default to synced with "C" operations. 210 ios_base::Init::_S_synced_with_stdio = true; 211 _S_ios_create(ios_base::Init::_S_synced_with_stdio); 212 } 213 ++_S_ios_base_init; 214 } 215 216 ios_base::Init::~Init() 217 { 218 if (--_S_ios_base_init == 0) 219 _S_ios_destroy(); 220 } 221 222 // 27.4.2.5 ios_base storage functions 223 int 224 ios_base::xalloc() throw() 225 { 226 // Implementation note: Initialize top to zero to ensure that 227 // initialization occurs before main() is started. 228 static _Atomic_word _S_top = 0; 229 return __exchange_and_add(&_S_top, 1) + 4; 230 } 231 232 // 27.4.2.5 iword/pword storage 233 ios_base::_Words& 234 ios_base::_M_grow_words(int ix) 235 { 236 // Precondition: _M_word_size <= ix 237 int newsize = _S_local_word_size; 238 _Words* words = _M_local_word; 239 if (ix > _S_local_word_size - 1) 240 { 241 if (ix < numeric_limits<int>::max()) 242 { 243 newsize = ix + 1; 244 try 245 { words = new _Words[newsize]; } 246 catch (...) 247 { 248 delete [] _M_word; 249 _M_word = 0; 250 _M_streambuf_state |= badbit; 251 if (_M_streambuf_state & _M_exception) 252 __throw_ios_failure("ios_base::_M_grow_words failure"); 253 return _M_word_zero; 254 } 255 for (int i = 0; i < _M_word_size; i++) 256 words[i] = _M_word[i]; 257 if (_M_word && _M_word != _M_local_word) 258 { 259 delete [] _M_word; 260 _M_word = 0; 261 } 262 } 263 else 264 { 265 _M_streambuf_state |= badbit; 266 return _M_word_zero; 267 } 268 } 269 _M_word = words; 270 _M_word_size = newsize; 271 return _M_word[ix]; 272 } 273 274 // Called only by basic_ios<>::init. 275 void 276 ios_base::_M_init() 277 { 278 // NB: May be called more than once 279 _M_precision = 6; 280 _M_width = 0; 281 _M_flags = skipws | dec; 282 _M_callbacks = 0; 283 _M_word_size = 0; 284 _M_ios_locale = locale(); 285 } 286 287 // 27.4.2.3 ios_base locale functions 288 locale 289 ios_base::imbue(const locale& __loc) 290 { 291 locale __old = _M_ios_locale; 292 _M_ios_locale = __loc; 293 _M_call_callbacks(imbue_event); 294 return __old; 295 } 296 297 ios_base::ios_base() : _M_callbacks(0), _M_word(0) 298 { 299 // Do nothing: basic_ios::init() does it. 300 // NB: _M_callbacks and _M_word must be zero for non-initialized 301 // ios_base to go through ~ios_base gracefully. 302 } 303 304 // 27.4.2.7 ios_base constructors/destructors 305 ios_base::~ios_base() 306 { 307 _M_call_callbacks(erase_event); 308 _M_dispose_callbacks(); 309 if (_M_word && _M_word != _M_local_word) 310 { 311 delete [] _M_word; 312 _M_word = 0; 313 } 314 } 315 316 void 317 ios_base::register_callback(event_callback __fn, int __index) 318 { _M_callbacks = new _Callback_list(__fn, __index, _M_callbacks); } 319 320 void 321 ios_base::_M_call_callbacks(event __e) throw() 322 { 323 _Callback_list* __p = _M_callbacks; 324 while (__p) 325 { 326 try 327 { (*__p->_M_fn) (__e, *this, __p->_M_index); } 328 catch (...) 329 { } 330 __p = __p->_M_next; 331 } 332 } 333 334 void 335 ios_base::_M_dispose_callbacks(void) 336 { 337 _Callback_list* __p = _M_callbacks; 338 while (__p && __p->_M_remove_reference() == 0) 339 { 340 _Callback_list* __next = __p->_M_next; 341 delete __p; 342 __p = __next; 343 } 344 _M_callbacks = 0; 345 } 346 347 bool 348 ios_base::sync_with_stdio(bool __sync) 349 { 350 #ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS 351 // 49. Underspecification of ios_base::sync_with_stdio 352 bool __ret = ios_base::Init::_S_synced_with_stdio; 353 #endif 354 355 // Turn off sync with C FILE* for cin, cout, cerr, clog iff 356 // currently synchronized. 357 if (!__sync && __ret) 358 { 359 ios_base::Init::_S_synced_with_stdio = false; 360 ios_base::Init::_S_ios_destroy(); 361 ios_base::Init::_S_ios_create(ios_base::Init::_S_synced_with_stdio); 362 } 363 return __ret; 364 } 365 } // namespace std 366