libstdc++-v3/include/bits/istream.tcc

   1 // istream classes -*- C++ -*-
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   4 // 2006, 2007, 2008, 2009
   5 // Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // Under Section 7 of GPL version 3, you are granted additional
  19 // permissions described in the GCC Runtime Library Exception, version
  20 // 3.1, as published by the Free Software Foundation.
  21
  22 // You should have received a copy of the GNU General Public License and
  23 // a copy of the GCC Runtime Library Exception along with this program;
  24 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 // <http://www.gnu.org/licenses/>.
  26
  27 /** @file istream.tcc
  28  *  This is an internal header file, included by other library headers.
  29  *  You should not attempt to use it directly.
  30  */
  31
  32 //
  33 // ISO C++ 14882: 27.6.1  Input streams
  34 //
  35
  36 #ifndef _ISTREAM_TCC
  37 #define _ISTREAM_TCC 1
  38
  39 #pragma GCC system_header
  40
  41 #include <cxxabi-forced.h>
  42
  43 _GLIBCXX_BEGIN_NAMESPACE(std)
  44
  45   template<typename _CharT, typename _Traits>
  46     basic_istream<_CharT, _Traits>::sentry::
  47     sentry(basic_istream<_CharT, _Traits>& __in, bool __noskip) : _M_ok(false)
  48     {
  49       ios_base::iostate __err = ios_base::goodbit;
  50       if (__in.good())
  51         {
  52           if (__in.tie())
  53             __in.tie()->flush();
  54           if (!__noskip && bool(__in.flags() & ios_base::skipws))
  55             {
  56               const __int_type __eof = traits_type::eof();
  57               __streambuf_type* __sb = __in.rdbuf();
  58               __int_type __c = __sb->sgetc();
  59
  60               const __ctype_type& __ct = __check_facet(__in._M_ctype);
  61               while (!traits_type::eq_int_type(__c, __eof)
  62                      && __ct.is(ctype_base::space,
  63                                 traits_type::to_char_type(__c)))
  64                 __c = __sb->snextc();
  65
  66               // _GLIBCXX_RESOLVE_LIB_DEFECTS
  67               // 195. Should basic_istream::sentry's constructor ever
  68               // set eofbit?
  69               if (traits_type::eq_int_type(__c, __eof))
  70                 __err |= ios_base::eofbit;
  71             }
  72         }
  73
  74       if (__in.good() && __err == ios_base::goodbit)
  75         _M_ok = true;
  76       else
  77         {
  78           __err |= ios_base::failbit;
  79           __in.setstate(__err);
  80         }
  81     }
  82
  83   template<typename _CharT, typename _Traits>
  84     template<typename _ValueT>
  85       basic_istream<_CharT, _Traits>&
  86       basic_istream<_CharT, _Traits>::
  87       _M_extract(_ValueT& __v)
  88       {
  89         sentry __cerb(*this, false);
  90         if (static_cast<bool>(__cerb))
  91           {
  92             ios_base::iostate __err = ios_base::goodbit;
  93             __try
  94               {
  95                 const __num_get_type& __ng = __check_facet(this->_M_num_get);
  96                 __ng.get(*this, 0, *this, __err, __v);
  97               }
  98             __catch(__cxxabiv1::__forced_unwind&)
  99               {
 100                 this->_M_setstate(ios_base::badbit);
 101                 __throw_exception_again;
 102               }
 103             __catch(...)
 104               { this->_M_setstate(ios_base::badbit); }
 105             if (__err)
 106               this->setstate(__err);
 107           }
 108         return *this;
 109       }
 110
 111   template<typename _CharT, typename _Traits>
 112     basic_istream<_CharT, _Traits>&
 113     basic_istream<_CharT, _Traits>::
 114     operator>>(short& __n)
 115     {
 116       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 117       // 118. basic_istream uses nonexistent num_get member functions.
 118       sentry __cerb(*this, false);
 119       if (static_cast<bool>(__cerb))
 120         {
 121           ios_base::iostate __err = ios_base::goodbit;
 122           __try
 123             {
 124               long __l;
 125               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 126               __ng.get(*this, 0, *this, __err, __l);
 127
 128               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 129               // 696. istream::operator>>(int&) broken.
 130               if (__l < __gnu_cxx::__numeric_traits<short>::__min)
 131                 {
 132                   __err |= ios_base::failbit;
 133                   __n = __gnu_cxx::__numeric_traits<short>::__min;
 134                 }
 135               else if (__l > __gnu_cxx::__numeric_traits<short>::__max)
 136                 {
 137                   __err |= ios_base::failbit;
 138                   __n = __gnu_cxx::__numeric_traits<short>::__max;
 139                 }
 140               else
 141                 __n = short(__l);
 142             }
 143           __catch(__cxxabiv1::__forced_unwind&)
 144             {
 145               this->_M_setstate(ios_base::badbit);
 146               __throw_exception_again;
 147             }
 148           __catch(...)
 149             { this->_M_setstate(ios_base::badbit); }
 150           if (__err)
 151             this->setstate(__err);
 152         }
 153       return *this;
 154     }
 155
 156   template<typename _CharT, typename _Traits>
 157     basic_istream<_CharT, _Traits>&
 158     basic_istream<_CharT, _Traits>::
 159     operator>>(int& __n)
 160     {
 161       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 162       // 118. basic_istream uses nonexistent num_get member functions.
 163       sentry __cerb(*this, false);
 164       if (static_cast<bool>(__cerb))
 165         {
 166           ios_base::iostate __err = ios_base::goodbit;
 167           __try
 168             {
 169               long __l;
 170               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 171               __ng.get(*this, 0, *this, __err, __l);
 172
 173               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 174               // 696. istream::operator>>(int&) broken.
 175               if (__l < __gnu_cxx::__numeric_traits<int>::__min)
 176                 {
 177                   __err |= ios_base::failbit;
 178                   __n = __gnu_cxx::__numeric_traits<int>::__min;
 179                 }
 180               else if (__l > __gnu_cxx::__numeric_traits<int>::__max)
 181                 {
 182                   __err |= ios_base::failbit;
 183                   __n = __gnu_cxx::__numeric_traits<int>::__max;
 184                 }
 185               else
 186                 __n = int(__l);
 187             }
 188           __catch(__cxxabiv1::__forced_unwind&)
 189             {
 190               this->_M_setstate(ios_base::badbit);
 191               __throw_exception_again;
 192             }
 193           __catch(...)
 194             { this->_M_setstate(ios_base::badbit); }
 195           if (__err)
 196             this->setstate(__err);
 197         }
 198       return *this;
 199     }
 200
 201   template<typename _CharT, typename _Traits>
 202     basic_istream<_CharT, _Traits>&
 203     basic_istream<_CharT, _Traits>::
 204     operator>>(__streambuf_type* __sbout)
 205     {
 206       ios_base::iostate __err = ios_base::goodbit;
 207       sentry __cerb(*this, false);
 208       if (__sbout && static_cast<bool>(__cerb))
 209         {
 210           __try
 211             {
 212               bool __ineof;
 213               if (!__copy_streambufs_eof(this->rdbuf(), __sbout, __ineof))
 214                 __err |= ios_base::failbit;
 215               if (__ineof)
 216                 __err |= ios_base::eofbit;
 217             }
 218           __catch(__cxxabiv1::__forced_unwind&)
 219             {
 220               this->_M_setstate(ios_base::failbit);
 221               __throw_exception_again;
 222             }
 223           __catch(...)
 224             { this->_M_setstate(ios_base::failbit); }
 225         }
 226       else if (!__sbout)
 227         __err |= ios_base::failbit;
 228       if (__err)
 229         this->setstate(__err);
 230       return *this;
 231     }
 232
 233   template<typename _CharT, typename _Traits>
 234     typename basic_istream<_CharT, _Traits>::int_type
 235     basic_istream<_CharT, _Traits>::
 236     get(void)
 237     {
 238       const int_type __eof = traits_type::eof();
 239       int_type __c = __eof;
 240       _M_gcount = 0;
 241       ios_base::iostate __err = ios_base::goodbit;
 242       sentry __cerb(*this, true);
 243       if (static_cast<bool>(__cerb))
 244         {
 245           __try
 246             {
 247               __c = this->rdbuf()->sbumpc();
 248               // 27.6.1.1 paragraph 3
 249               if (!traits_type::eq_int_type(__c, __eof))
 250                 _M_gcount = 1;
 251               else
 252                 __err |= ios_base::eofbit;
 253             }
 254           __catch(__cxxabiv1::__forced_unwind&)
 255             {
 256               this->_M_setstate(ios_base::badbit);
 257               __throw_exception_again;
 258             }
 259           __catch(...)
 260             { this->_M_setstate(ios_base::badbit); }
 261         }
 262       if (!_M_gcount)
 263         __err |= ios_base::failbit;
 264       if (__err)
 265         this->setstate(__err);
 266       return __c;
 267     }
 268
 269   template<typename _CharT, typename _Traits>
 270     basic_istream<_CharT, _Traits>&
 271     basic_istream<_CharT, _Traits>::
 272     get(char_type& __c)
 273     {
 274       _M_gcount = 0;
 275       ios_base::iostate __err = ios_base::goodbit;
 276       sentry __cerb(*this, true);
 277       if (static_cast<bool>(__cerb))
 278         {
 279           __try
 280             {
 281               const int_type __cb = this->rdbuf()->sbumpc();
 282               // 27.6.1.1 paragraph 3
 283               if (!traits_type::eq_int_type(__cb, traits_type::eof()))
 284                 {
 285                   _M_gcount = 1;
 286                   __c = traits_type::to_char_type(__cb);
 287                 }
 288               else
 289                 __err |= ios_base::eofbit;
 290             }
 291           __catch(__cxxabiv1::__forced_unwind&)
 292             {
 293               this->_M_setstate(ios_base::badbit);
 294               __throw_exception_again;
 295             }
 296           __catch(...)
 297             { this->_M_setstate(ios_base::badbit); }
 298         }
 299       if (!_M_gcount)
 300         __err |= ios_base::failbit;
 301       if (__err)
 302         this->setstate(__err);
 303       return *this;
 304     }
 305
 306   template<typename _CharT, typename _Traits>
 307     basic_istream<_CharT, _Traits>&
 308     basic_istream<_CharT, _Traits>::
 309     get(char_type* __s, streamsize __n, char_type __delim)
 310     {
 311       _M_gcount = 0;
 312       ios_base::iostate __err = ios_base::goodbit;
 313       sentry __cerb(*this, true);
 314       if (static_cast<bool>(__cerb))
 315         {
 316           __try
 317             {
 318               const int_type __idelim = traits_type::to_int_type(__delim);
 319               const int_type __eof = traits_type::eof();
 320               __streambuf_type* __sb = this->rdbuf();
 321               int_type __c = __sb->sgetc();
 322
 323               while (_M_gcount + 1 < __n
 324                      && !traits_type::eq_int_type(__c, __eof)
 325                      && !traits_type::eq_int_type(__c, __idelim))
 326                 {
 327                   *__s++ = traits_type::to_char_type(__c);
 328                   ++_M_gcount;
 329                   __c = __sb->snextc();
 330                 }
 331               if (traits_type::eq_int_type(__c, __eof))
 332                 __err |= ios_base::eofbit;
 333             }
 334           __catch(__cxxabiv1::__forced_unwind&)
 335             {
 336               this->_M_setstate(ios_base::badbit);
 337               __throw_exception_again;
 338             }
 339           __catch(...)
 340             { this->_M_setstate(ios_base::badbit); }
 341         }
 342       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 343       // 243. get and getline when sentry reports failure.
 344       if (__n > 0)
 345         *__s = char_type();
 346       if (!_M_gcount)
 347         __err |= ios_base::failbit;
 348       if (__err)
 349         this->setstate(__err);
 350       return *this;
 351     }
 352
 353   template<typename _CharT, typename _Traits>
 354     basic_istream<_CharT, _Traits>&
 355     basic_istream<_CharT, _Traits>::
 356     get(__streambuf_type& __sb, char_type __delim)
 357     {
 358       _M_gcount = 0;
 359       ios_base::iostate __err = ios_base::goodbit;
 360       sentry __cerb(*this, true);
 361       if (static_cast<bool>(__cerb))
 362         {
 363           __try
 364             {
 365               const int_type __idelim = traits_type::to_int_type(__delim);
 366               const int_type __eof = traits_type::eof();
 367               __streambuf_type* __this_sb = this->rdbuf();
 368               int_type __c = __this_sb->sgetc();
 369               char_type __c2 = traits_type::to_char_type(__c);
 370
 371               while (!traits_type::eq_int_type(__c, __eof)
 372                      && !traits_type::eq_int_type(__c, __idelim)
 373                      && !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
 374                 {
 375                   ++_M_gcount;
 376                   __c = __this_sb->snextc();
 377                   __c2 = traits_type::to_char_type(__c);
 378                 }
 379               if (traits_type::eq_int_type(__c, __eof))
 380                 __err |= ios_base::eofbit;
 381             }
 382           __catch(__cxxabiv1::__forced_unwind&)
 383             {
 384               this->_M_setstate(ios_base::badbit);
 385               __throw_exception_again;
 386             }
 387           __catch(...)
 388             { this->_M_setstate(ios_base::badbit); }
 389         }
 390       if (!_M_gcount)
 391         __err |= ios_base::failbit;
 392       if (__err)
 393         this->setstate(__err);
 394       return *this;
 395     }
 396
 397   template<typename _CharT, typename _Traits>
 398     basic_istream<_CharT, _Traits>&
 399     basic_istream<_CharT, _Traits>::
 400     getline(char_type* __s, streamsize __n, char_type __delim)
 401     {
 402       _M_gcount = 0;
 403       ios_base::iostate __err = ios_base::goodbit;
 404       sentry __cerb(*this, true);
 405       if (static_cast<bool>(__cerb))
 406         {
 407           __try
 408             {
 409               const int_type __idelim = traits_type::to_int_type(__delim);
 410               const int_type __eof = traits_type::eof();
 411               __streambuf_type* __sb = this->rdbuf();
 412               int_type __c = __sb->sgetc();
 413
 414               while (_M_gcount + 1 < __n
 415                      && !traits_type::eq_int_type(__c, __eof)
 416                      && !traits_type::eq_int_type(__c, __idelim))
 417                 {
 418                   *__s++ = traits_type::to_char_type(__c);
 419                   __c = __sb->snextc();
 420                   ++_M_gcount;
 421                 }
 422               if (traits_type::eq_int_type(__c, __eof))
 423                 __err |= ios_base::eofbit;
 424               else
 425                 {
 426                   if (traits_type::eq_int_type(__c, __idelim))
 427                     {
 428                       __sb->sbumpc();
 429                       ++_M_gcount;
 430                     }
 431                   else
 432                     __err |= ios_base::failbit;
 433                 }
 434             }
 435           __catch(__cxxabiv1::__forced_unwind&)
 436             {
 437               this->_M_setstate(ios_base::badbit);
 438               __throw_exception_again;
 439             }
 440           __catch(...)
 441             { this->_M_setstate(ios_base::badbit); }
 442         }
 443       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 444       // 243. get and getline when sentry reports failure.
 445       if (__n > 0)
 446         *__s = char_type();
 447       if (!_M_gcount)
 448         __err |= ios_base::failbit;
 449       if (__err)
 450         this->setstate(__err);
 451       return *this;
 452     }
 453
 454   // We provide three overloads, since the first two are much simpler
 455   // than the general case. Also, the latter two can thus adopt the
 456   // same "batchy" strategy used by getline above.
 457   template<typename _CharT, typename _Traits>
 458     basic_istream<_CharT, _Traits>&
 459     basic_istream<_CharT, _Traits>::
 460     ignore(void)
 461     {
 462       _M_gcount = 0;
 463       sentry __cerb(*this, true);
 464       if (static_cast<bool>(__cerb))
 465         {
 466           ios_base::iostate __err = ios_base::goodbit;
 467           __try
 468             {
 469               const int_type __eof = traits_type::eof();
 470               __streambuf_type* __sb = this->rdbuf();
 471
 472               if (traits_type::eq_int_type(__sb->sbumpc(), __eof))
 473                 __err |= ios_base::eofbit;
 474               else
 475                 _M_gcount = 1;
 476             }
 477           __catch(__cxxabiv1::__forced_unwind&)
 478             {
 479               this->_M_setstate(ios_base::badbit);
 480               __throw_exception_again;
 481             }
 482           __catch(...)
 483             { this->_M_setstate(ios_base::badbit); }
 484           if (__err)
 485             this->setstate(__err);
 486         }
 487       return *this;
 488     }
 489
 490   template<typename _CharT, typename _Traits>
 491     basic_istream<_CharT, _Traits>&
 492     basic_istream<_CharT, _Traits>::
 493     ignore(streamsize __n)
 494     {
 495       _M_gcount = 0;
 496       sentry __cerb(*this, true);
 497       if (__n > 0 && static_cast<bool>(__cerb))
 498         {
 499           ios_base::iostate __err = ios_base::goodbit;
 500           __try
 501             {
 502               const int_type __eof = traits_type::eof();
 503               __streambuf_type* __sb = this->rdbuf();
 504               int_type __c = __sb->sgetc();
 505
 506               // N.B. On LFS-enabled platforms streamsize is still 32 bits
 507               // wide: if we want to implement the standard mandated behavior
 508               // for n == max() (see 27.6.1.3/24) we are at risk of signed
 509               // integer overflow: thus these contortions. Also note that,
 510               // by definition, when more than 2G chars are actually ignored,
 511               // _M_gcount (the return value of gcount, that is) cannot be
 512               // really correct, being unavoidably too small.
 513               bool __large_ignore = false;
 514               while (true)
 515                 {
 516                   while (_M_gcount < __n
 517                          && !traits_type::eq_int_type(__c, __eof))
 518                     {
 519                       ++_M_gcount;
 520                       __c = __sb->snextc();
 521                     }
 522                   if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
 523                       && !traits_type::eq_int_type(__c, __eof))
 524                     {
 525                       _M_gcount =
 526                         __gnu_cxx::__numeric_traits<streamsize>::__min;
 527                       __large_ignore = true;
 528                     }
 529                   else
 530                     break;
 531                 }
 532
 533               if (__large_ignore)
 534                 _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
 535
 536               if (traits_type::eq_int_type(__c, __eof))
 537                 __err |= ios_base::eofbit;
 538             }
 539           __catch(__cxxabiv1::__forced_unwind&)
 540             {
 541               this->_M_setstate(ios_base::badbit);
 542               __throw_exception_again;
 543             }
 544           __catch(...)
 545             { this->_M_setstate(ios_base::badbit); }
 546           if (__err)
 547             this->setstate(__err);
 548         }
 549       return *this;
 550     }
 551
 552   template<typename _CharT, typename _Traits>
 553     basic_istream<_CharT, _Traits>&
 554     basic_istream<_CharT, _Traits>::
 555     ignore(streamsize __n, int_type __delim)
 556     {
 557       _M_gcount = 0;
 558       sentry __cerb(*this, true);
 559       if (__n > 0 && static_cast<bool>(__cerb))
 560         {
 561           ios_base::iostate __err = ios_base::goodbit;
 562           __try
 563             {
 564               const int_type __eof = traits_type::eof();
 565               __streambuf_type* __sb = this->rdbuf();
 566               int_type __c = __sb->sgetc();
 567
 568               // See comment above.
 569               bool __large_ignore = false;
 570               while (true)
 571                 {
 572                   while (_M_gcount < __n
 573                          && !traits_type::eq_int_type(__c, __eof)
 574                          && !traits_type::eq_int_type(__c, __delim))
 575                     {
 576                       ++_M_gcount;
 577                       __c = __sb->snextc();
 578                     }
 579                   if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
 580                       && !traits_type::eq_int_type(__c, __eof)
 581                       && !traits_type::eq_int_type(__c, __delim))
 582                     {
 583                       _M_gcount =
 584                         __gnu_cxx::__numeric_traits<streamsize>::__min;
 585                       __large_ignore = true;
 586                     }
 587                   else
 588                     break;
 589                 }
 590
 591               if (__large_ignore)
 592                 _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
 593
 594               if (traits_type::eq_int_type(__c, __eof))
 595                 __err |= ios_base::eofbit;
 596               else if (traits_type::eq_int_type(__c, __delim))
 597                 {
 598                   if (_M_gcount
 599                       < __gnu_cxx::__numeric_traits<streamsize>::__max)
 600                     ++_M_gcount;
 601                   __sb->sbumpc();
 602                 }
 603             }
 604           __catch(__cxxabiv1::__forced_unwind&)
 605             {
 606               this->_M_setstate(ios_base::badbit);
 607               __throw_exception_again;
 608             }
 609           __catch(...)
 610             { this->_M_setstate(ios_base::badbit); }
 611           if (__err)
 612             this->setstate(__err);
 613         }
 614       return *this;
 615     }
 616
 617   template<typename _CharT, typename _Traits>
 618     typename basic_istream<_CharT, _Traits>::int_type
 619     basic_istream<_CharT, _Traits>::
 620     peek(void)
 621     {
 622       int_type __c = traits_type::eof();
 623       _M_gcount = 0;
 624       sentry __cerb(*this, true);
 625       if (static_cast<bool>(__cerb))
 626         {
 627           ios_base::iostate __err = ios_base::goodbit;
 628           __try
 629             {
 630               __c = this->rdbuf()->sgetc();
 631               if (traits_type::eq_int_type(__c, traits_type::eof()))
 632                 __err |= ios_base::eofbit;
 633             }
 634           __catch(__cxxabiv1::__forced_unwind&)
 635             {
 636               this->_M_setstate(ios_base::badbit);
 637               __throw_exception_again;
 638             }
 639           __catch(...)
 640             { this->_M_setstate(ios_base::badbit); }
 641           if (__err)
 642             this->setstate(__err);
 643         }
 644       return __c;
 645     }
 646
 647   template<typename _CharT, typename _Traits>
 648     basic_istream<_CharT, _Traits>&
 649     basic_istream<_CharT, _Traits>::
 650     read(char_type* __s, streamsize __n)
 651     {
 652       _M_gcount = 0;
 653       sentry __cerb(*this, true);
 654       if (static_cast<bool>(__cerb))
 655         {
 656           ios_base::iostate __err = ios_base::goodbit;
 657           __try
 658             {
 659               _M_gcount = this->rdbuf()->sgetn(__s, __n);
 660               if (_M_gcount != __n)
 661                 __err |= (ios_base::eofbit | ios_base::failbit);
 662             }
 663           __catch(__cxxabiv1::__forced_unwind&)
 664             {
 665               this->_M_setstate(ios_base::badbit);
 666               __throw_exception_again;
 667             }
 668           __catch(...)
 669             { this->_M_setstate(ios_base::badbit); }
 670           if (__err)
 671             this->setstate(__err);
 672         }
 673       return *this;
 674     }
 675
 676   template<typename _CharT, typename _Traits>
 677     streamsize
 678     basic_istream<_CharT, _Traits>::
 679     readsome(char_type* __s, streamsize __n)
 680     {
 681       _M_gcount = 0;
 682       sentry __cerb(*this, true);
 683       if (static_cast<bool>(__cerb))
 684         {
 685           ios_base::iostate __err = ios_base::goodbit;
 686           __try
 687             {
 688               // Cannot compare int_type with streamsize generically.
 689               const streamsize __num = this->rdbuf()->in_avail();
 690               if (__num > 0)
 691                 _M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
 692               else if (__num == -1)
 693                 __err |= ios_base::eofbit;
 694             }
 695           __catch(__cxxabiv1::__forced_unwind&)
 696             {
 697               this->_M_setstate(ios_base::badbit);
 698               __throw_exception_again;
 699             }
 700           __catch(...)
 701             { this->_M_setstate(ios_base::badbit); }
 702           if (__err)
 703             this->setstate(__err);
 704         }
 705       return _M_gcount;
 706     }
 707
 708   template<typename _CharT, typename _Traits>
 709     basic_istream<_CharT, _Traits>&
 710     basic_istream<_CharT, _Traits>::
 711     putback(char_type __c)
 712     {
 713       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 714       // 60. What is a formatted input function?
 715       _M_gcount = 0;
 716       sentry __cerb(*this, true);
 717       if (static_cast<bool>(__cerb))
 718         {
 719           ios_base::iostate __err = ios_base::goodbit;
 720           __try
 721             {
 722               const int_type __eof = traits_type::eof();
 723               __streambuf_type* __sb = this->rdbuf();
 724               if (!__sb
 725                   || traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
 726                 __err |= ios_base::badbit;
 727             }
 728           __catch(__cxxabiv1::__forced_unwind&)
 729             {
 730               this->_M_setstate(ios_base::badbit);
 731               __throw_exception_again;
 732             }
 733           __catch(...)
 734             { this->_M_setstate(ios_base::badbit); }
 735           if (__err)
 736             this->setstate(__err);
 737         }
 738       return *this;
 739     }
 740
 741   template<typename _CharT, typename _Traits>
 742     basic_istream<_CharT, _Traits>&
 743     basic_istream<_CharT, _Traits>::
 744     unget(void)
 745     {
 746       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 747       // 60. What is a formatted input function?
 748       _M_gcount = 0;
 749       sentry __cerb(*this, true);
 750       if (static_cast<bool>(__cerb))
 751         {
 752           ios_base::iostate __err = ios_base::goodbit;
 753           __try
 754             {
 755               const int_type __eof = traits_type::eof();
 756               __streambuf_type* __sb = this->rdbuf();
 757               if (!__sb
 758                   || traits_type::eq_int_type(__sb->sungetc(), __eof))
 759                 __err |= ios_base::badbit;
 760             }
 761           __catch(__cxxabiv1::__forced_unwind&)
 762             {
 763               this->_M_setstate(ios_base::badbit);
 764               __throw_exception_again;
 765             }
 766           __catch(...)
 767             { this->_M_setstate(ios_base::badbit); }
 768           if (__err)
 769             this->setstate(__err);
 770         }
 771       return *this;
 772     }
 773
 774   template<typename _CharT, typename _Traits>
 775     int
 776     basic_istream<_CharT, _Traits>::
 777     sync(void)
 778     {
 779       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 780       // DR60.  Do not change _M_gcount.
 781       int __ret = -1;
 782       sentry __cerb(*this, true);
 783       if (static_cast<bool>(__cerb))
 784         {
 785           ios_base::iostate __err = ios_base::goodbit;
 786           __try
 787             {
 788               __streambuf_type* __sb = this->rdbuf();
 789               if (__sb)
 790                 {
 791                   if (__sb->pubsync() == -1)
 792                     __err |= ios_base::badbit;
 793                   else
 794                     __ret = 0;
 795                 }
 796             }
 797           __catch(__cxxabiv1::__forced_unwind&)
 798             {
 799               this->_M_setstate(ios_base::badbit);
 800               __throw_exception_again;
 801             }
 802           __catch(...)
 803             { this->_M_setstate(ios_base::badbit); }
 804           if (__err)
 805             this->setstate(__err);
 806         }
 807       return __ret;
 808     }
 809
 810   template<typename _CharT, typename _Traits>
 811     typename basic_istream<_CharT, _Traits>::pos_type
 812     basic_istream<_CharT, _Traits>::
 813     tellg(void)
 814     {
 815       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 816       // DR60.  Do not change _M_gcount.
 817       pos_type __ret = pos_type(-1);
 818       __try
 819         {
 820           if (!this->fail())
 821             __ret = this->rdbuf()->pubseekoff(0, ios_base::cur,
 822                                               ios_base::in);
 823         }
 824       __catch(__cxxabiv1::__forced_unwind&)
 825         {
 826           this->_M_setstate(ios_base::badbit);
 827           __throw_exception_again;
 828         }
 829       __catch(...)
 830         { this->_M_setstate(ios_base::badbit); }
 831       return __ret;
 832     }
 833
 834   template<typename _CharT, typename _Traits>
 835     basic_istream<_CharT, _Traits>&
 836     basic_istream<_CharT, _Traits>::
 837     seekg(pos_type __pos)
 838     {
 839       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 840       // DR60.  Do not change _M_gcount.
 841       ios_base::iostate __err = ios_base::goodbit;
 842       __try
 843         {
 844           if (!this->fail())
 845             {
 846               // 136.  seekp, seekg setting wrong streams?
 847               const pos_type __p = this->rdbuf()->pubseekpos(__pos,
 848                                                              ios_base::in);
 849
 850               // 129.  Need error indication from seekp() and seekg()
 851               if (__p == pos_type(off_type(-1)))
 852                 __err |= ios_base::failbit;
 853             }
 854         }
 855       __catch(__cxxabiv1::__forced_unwind&)
 856         {
 857           this->_M_setstate(ios_base::badbit);
 858           __throw_exception_again;
 859         }
 860       __catch(...)
 861         { this->_M_setstate(ios_base::badbit); }
 862       if (__err)
 863         this->setstate(__err);
 864       return *this;
 865     }
 866
 867   template<typename _CharT, typename _Traits>
 868     basic_istream<_CharT, _Traits>&
 869     basic_istream<_CharT, _Traits>::
 870     seekg(off_type __off, ios_base::seekdir __dir)
 871     {
 872       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 873       // DR60.  Do not change _M_gcount.
 874       ios_base::iostate __err = ios_base::goodbit;
 875       __try
 876         {
 877           if (!this->fail())
 878             {
 879               // 136.  seekp, seekg setting wrong streams?
 880               const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir,
 881                                                              ios_base::in);
 882
 883               // 129.  Need error indication from seekp() and seekg()
 884               if (__p == pos_type(off_type(-1)))
 885                 __err |= ios_base::failbit;
 886             }
 887         }
 888       __catch(__cxxabiv1::__forced_unwind&)
 889         {
 890           this->_M_setstate(ios_base::badbit);
 891           __throw_exception_again;
 892         }
 893       __catch(...)
 894         { this->_M_setstate(ios_base::badbit); }
 895       if (__err)
 896         this->setstate(__err);
 897       return *this;
 898     }
 899
 900   // 27.6.1.2.3 Character extraction templates
 901   template<typename _CharT, typename _Traits>
 902     basic_istream<_CharT, _Traits>&
 903     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
 904     {
 905       typedef basic_istream<_CharT, _Traits>            __istream_type;
 906       typedef typename __istream_type::int_type         __int_type;
 907
 908       typename __istream_type::sentry __cerb(__in, false);
 909       if (static_cast<bool>(__cerb))
 910         {
 911           ios_base::iostate __err = ios_base::goodbit;
 912           __try
 913             {
 914               const __int_type __cb = __in.rdbuf()->sbumpc();
 915               if (!_Traits::eq_int_type(__cb, _Traits::eof()))
 916                 __c = _Traits::to_char_type(__cb);
 917               else
 918                 __err |= (ios_base::eofbit | ios_base::failbit);
 919             }
 920           __catch(__cxxabiv1::__forced_unwind&)
 921             {
 922               __in._M_setstate(ios_base::badbit);
 923               __throw_exception_again;
 924             }
 925           __catch(...)
 926             { __in._M_setstate(ios_base::badbit); }
 927           if (__err)
 928             __in.setstate(__err);
 929         }
 930       return __in;
 931     }
 932
 933   template<typename _CharT, typename _Traits>
 934     basic_istream<_CharT, _Traits>&
 935     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
 936     {
 937       typedef basic_istream<_CharT, _Traits>            __istream_type;
 938       typedef basic_streambuf<_CharT, _Traits>          __streambuf_type;
 939       typedef typename _Traits::int_type                int_type;
 940       typedef _CharT                                    char_type;
 941       typedef ctype<_CharT>                             __ctype_type;
 942
 943       streamsize __extracted = 0;
 944       ios_base::iostate __err = ios_base::goodbit;
 945       typename __istream_type::sentry __cerb(__in, false);
 946       if (static_cast<bool>(__cerb))
 947         {
 948           __try
 949             {
 950               // Figure out how many characters to extract.
 951               streamsize __num = __in.width();
 952               if (__num <= 0)
 953                 __num = __gnu_cxx::__numeric_traits<streamsize>::__max;
 954
 955               const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
 956
 957               const int_type __eof = _Traits::eof();
 958               __streambuf_type* __sb = __in.rdbuf();
 959               int_type __c = __sb->sgetc();
 960
 961               while (__extracted < __num - 1
 962                      && !_Traits::eq_int_type(__c, __eof)
 963                      && !__ct.is(ctype_base::space,
 964                                  _Traits::to_char_type(__c)))
 965                 {
 966                   *__s++ = _Traits::to_char_type(__c);
 967                   ++__extracted;
 968                   __c = __sb->snextc();
 969                 }
 970               if (_Traits::eq_int_type(__c, __eof))
 971                 __err |= ios_base::eofbit;
 972
 973               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 974               // 68.  Extractors for char* should store null at end
 975               *__s = char_type();
 976               __in.width(0);
 977             }
 978           __catch(__cxxabiv1::__forced_unwind&)
 979             {
 980               __in._M_setstate(ios_base::badbit);
 981               __throw_exception_again;
 982             }
 983           __catch(...)
 984             { __in._M_setstate(ios_base::badbit); }
 985         }
 986       if (!__extracted)
 987         __err |= ios_base::failbit;
 988       if (__err)
 989         __in.setstate(__err);
 990       return __in;
 991     }
 992
 993   // 27.6.1.4 Standard basic_istream manipulators
 994   template<typename _CharT, typename _Traits>
 995     basic_istream<_CharT, _Traits>&
 996     ws(basic_istream<_CharT, _Traits>& __in)
 997     {
 998       typedef basic_istream<_CharT, _Traits>            __istream_type;
 999       typedef basic_streambuf<_CharT, _Traits>          __streambuf_type;
1000       typedef typename __istream_type::int_type         __int_type;
1001       typedef ctype<_CharT>                             __ctype_type;
1002
1003       const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
1004       const __int_type __eof = _Traits::eof();
1005       __streambuf_type* __sb = __in.rdbuf();
1006       __int_type __c = __sb->sgetc();
1007
1008       while (!_Traits::eq_int_type(__c, __eof)
1009              && __ct.is(ctype_base::space, _Traits::to_char_type(__c)))
1010         __c = __sb->snextc();
1011
1012        if (_Traits::eq_int_type(__c, __eof))
1013          __in.setstate(ios_base::eofbit);
1014       return __in;
1015     }
1016
1017   // Inhibit implicit instantiations for required instantiations,
1018   // which are defined via explicit instantiations elsewhere.
1019   // NB:  This syntax is a GNU extension.
1020 #if _GLIBCXX_EXTERN_TEMPLATE
1021   extern template class basic_istream<char>;
1022   extern template istream& ws(istream&);
1023   extern template istream& operator>>(istream&, char&);
1024   extern template istream& operator>>(istream&, char*);
1025   extern template istream& operator>>(istream&, unsigned char&);
1026   extern template istream& operator>>(istream&, signed char&);
1027   extern template istream& operator>>(istream&, unsigned char*);
1028   extern template istream& operator>>(istream&, signed char*);
1029
1030   extern template istream& istream::_M_extract(unsigned short&);
1031   extern template istream& istream::_M_extract(unsigned int&);
1032   extern template istream& istream::_M_extract(long&);
1033   extern template istream& istream::_M_extract(unsigned long&);
1034   extern template istream& istream::_M_extract(bool&);
1035 #ifdef _GLIBCXX_USE_LONG_LONG
1036   extern template istream& istream::_M_extract(long long&);
1037   extern template istream& istream::_M_extract(unsigned long long&);
1038 #endif
1039   extern template istream& istream::_M_extract(float&);
1040   extern template istream& istream::_M_extract(double&);
1041   extern template istream& istream::_M_extract(long double&);
1042   extern template istream& istream::_M_extract(void*&);
1043
1044   extern template class basic_iostream<char>;
1045
1046 #ifdef _GLIBCXX_USE_WCHAR_T
1047   extern template class basic_istream<wchar_t>;
1048   extern template wistream& ws(wistream&);
1049   extern template wistream& operator>>(wistream&, wchar_t&);
1050   extern template wistream& operator>>(wistream&, wchar_t*);
1051
1052   extern template wistream& wistream::_M_extract(unsigned short&);
1053   extern template wistream& wistream::_M_extract(unsigned int&);
1054   extern template wistream& wistream::_M_extract(long&);
1055   extern template wistream& wistream::_M_extract(unsigned long&);
1056   extern template wistream& wistream::_M_extract(bool&);
1057 #ifdef _GLIBCXX_USE_LONG_LONG
1058   extern template wistream& wistream::_M_extract(long long&);
1059   extern template wistream& wistream::_M_extract(unsigned long long&);
1060 #endif
1061   extern template wistream& wistream::_M_extract(float&);
1062   extern template wistream& wistream::_M_extract(double&);
1063   extern template wistream& wistream::_M_extract(long double&);
1064   extern template wistream& wistream::_M_extract(void*&);
1065
1066   extern template class basic_iostream<wchar_t>;
1067 #endif
1068 #endif
1069
1070 _GLIBCXX_END_NAMESPACE
1071
1072 #endif