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

   1 // istream classes -*- C++ -*-
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   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: 27.6.1  Input streams
  33 //
  34
  35 #ifndef _ISTREAM_TCC
  36 #define _ISTREAM_TCC 1
  37
  38 #pragma GCC system_header
  39
  40 #include <locale>
  41 #include <ostream> // For flush()
  42
  43 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::iostate(ios_base::goodbit);
  50       if (__in.good())
  51         {
  52           if (__in.tie())
  53             __in.tie()->flush();
  54           if (!__noskip && (__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     basic_istream<_CharT, _Traits>&
  85     basic_istream<_CharT, _Traits>::
  86     operator>>(__istream_type& (*__pf)(__istream_type&))
  87     { return __pf(*this); }
  88
  89   template<typename _CharT, typename _Traits>
  90     basic_istream<_CharT, _Traits>&
  91     basic_istream<_CharT, _Traits>::
  92     operator>>(__ios_type& (*__pf)(__ios_type&))
  93     {
  94       __pf(*this);
  95       return *this;
  96     }
  97
  98   template<typename _CharT, typename _Traits>
  99     basic_istream<_CharT, _Traits>&
 100     basic_istream<_CharT, _Traits>::
 101     operator>>(ios_base& (*__pf)(ios_base&))
 102     {
 103       __pf(*this);
 104       return *this;
 105     }
 106
 107   template<typename _CharT, typename _Traits>
 108     basic_istream<_CharT, _Traits>&
 109     basic_istream<_CharT, _Traits>::
 110     operator>>(bool& __n)
 111     {
 112       sentry __cerb(*this, false);
 113       if (__cerb)
 114         {
 115           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 116           try
 117             {
 118               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 119               __ng.get(*this, 0, *this, __err, __n);
 120             }
 121           catch(...)
 122             { this->_M_setstate(ios_base::badbit); }
 123           if (__err)
 124             this->setstate(__err);
 125         }
 126       return *this;
 127     }
 128
 129   template<typename _CharT, typename _Traits>
 130     basic_istream<_CharT, _Traits>&
 131     basic_istream<_CharT, _Traits>::
 132     operator>>(short& __n)
 133     {
 134       sentry __cerb(*this, false);
 135       if (__cerb)
 136         {
 137           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 138           try
 139             {
 140               long __l;
 141               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 142               __ng.get(*this, 0, *this, __err, __l);
 143               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 144               // 118. basic_istream uses nonexistent num_get member functions.
 145               if (!(__err & ios_base::failbit)
 146                   && (numeric_limits<short>::min() <= __l
 147                       && __l <= numeric_limits<short>::max()))
 148                 __n = __l;
 149               else
 150                 __err |= ios_base::failbit;
 151             }
 152           catch(...)
 153             { this->_M_setstate(ios_base::badbit); }
 154           if (__err)
 155             this->setstate(__err);
 156         }
 157       return *this;
 158     }
 159
 160   template<typename _CharT, typename _Traits>
 161     basic_istream<_CharT, _Traits>&
 162     basic_istream<_CharT, _Traits>::
 163     operator>>(unsigned short& __n)
 164     {
 165       sentry __cerb(*this, false);
 166       if (__cerb)
 167         {
 168           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 169           try
 170             {
 171               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 172               __ng.get(*this, 0, *this, __err, __n);
 173             }
 174           catch(...)
 175             { this->_M_setstate(ios_base::badbit); }
 176           if (__err)
 177             this->setstate(__err);
 178         }
 179       return *this;
 180     }
 181
 182   template<typename _CharT, typename _Traits>
 183     basic_istream<_CharT, _Traits>&
 184     basic_istream<_CharT, _Traits>::
 185     operator>>(int& __n)
 186     {
 187       sentry __cerb(*this, false);
 188       if (__cerb)
 189         {
 190           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 191           try
 192             {
 193               long __l;
 194               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 195               __ng.get(*this, 0, *this, __err, __l);
 196               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 197               // 118. basic_istream uses nonexistent num_get member functions.
 198               if (!(__err & ios_base::failbit)
 199                   && (numeric_limits<int>::min() <= __l
 200                       && __l <= numeric_limits<int>::max()))
 201                 __n = __l;
 202               else
 203                 __err |= ios_base::failbit;
 204             }
 205           catch(...)
 206             { this->_M_setstate(ios_base::badbit); }
 207           if (__err)
 208             this->setstate(__err);
 209         }
 210       return *this;
 211     }
 212
 213   template<typename _CharT, typename _Traits>
 214     basic_istream<_CharT, _Traits>&
 215     basic_istream<_CharT, _Traits>::
 216     operator>>(unsigned int& __n)
 217     {
 218       sentry __cerb(*this, false);
 219       if (__cerb)
 220         {
 221           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 222           try
 223             {
 224               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 225               __ng.get(*this, 0, *this, __err, __n);
 226             }
 227           catch(...)
 228             { this->_M_setstate(ios_base::badbit); }
 229           if (__err)
 230             this->setstate(__err);
 231         }
 232       return *this;
 233     }
 234
 235   template<typename _CharT, typename _Traits>
 236     basic_istream<_CharT, _Traits>&
 237     basic_istream<_CharT, _Traits>::
 238     operator>>(long& __n)
 239     {
 240       sentry __cerb(*this, false);
 241       if (__cerb)
 242         {
 243           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 244           try
 245             {
 246               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 247               __ng.get(*this, 0, *this, __err, __n);
 248             }
 249           catch(...)
 250             { this->_M_setstate(ios_base::badbit); }
 251           if (__err)
 252             this->setstate(__err);
 253         }
 254       return *this;
 255     }
 256
 257   template<typename _CharT, typename _Traits>
 258     basic_istream<_CharT, _Traits>&
 259     basic_istream<_CharT, _Traits>::
 260     operator>>(unsigned long& __n)
 261     {
 262       sentry __cerb(*this, false);
 263       if (__cerb)
 264         {
 265           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 266           try
 267             {
 268               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 269               __ng.get(*this, 0, *this, __err, __n);
 270             }
 271           catch(...)
 272             { this->_M_setstate(ios_base::badbit); }
 273           if (__err)
 274             this->setstate(__err);
 275         }
 276       return *this;
 277     }
 278
 279 #ifdef _GLIBCXX_USE_LONG_LONG
 280   template<typename _CharT, typename _Traits>
 281     basic_istream<_CharT, _Traits>&
 282     basic_istream<_CharT, _Traits>::
 283     operator>>(long long& __n)
 284     {
 285       sentry __cerb(*this, false);
 286       if (__cerb)
 287         {
 288           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 289           try
 290             {
 291               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 292               __ng.get(*this, 0, *this, __err, __n);
 293             }
 294           catch(...)
 295             { this->_M_setstate(ios_base::badbit); }
 296           if (__err)
 297             this->setstate(__err);
 298         }
 299       return *this;
 300     }
 301
 302   template<typename _CharT, typename _Traits>
 303     basic_istream<_CharT, _Traits>&
 304     basic_istream<_CharT, _Traits>::
 305     operator>>(unsigned long long& __n)
 306     {
 307       sentry __cerb(*this, false);
 308       if (__cerb)
 309         {
 310           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 311           try
 312             {
 313               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 314               __ng.get(*this, 0, *this, __err, __n);
 315             }
 316           catch(...)
 317             { this->_M_setstate(ios_base::badbit); }
 318           if (__err)
 319             this->setstate(__err);
 320         }
 321       return *this;
 322     }
 323 #endif
 324
 325   template<typename _CharT, typename _Traits>
 326     basic_istream<_CharT, _Traits>&
 327     basic_istream<_CharT, _Traits>::
 328     operator>>(float& __n)
 329     {
 330       sentry __cerb(*this, false);
 331       if (__cerb)
 332         {
 333           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 334           try
 335             {
 336               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 337               __ng.get(*this, 0, *this, __err, __n);
 338             }
 339           catch(...)
 340             { this->_M_setstate(ios_base::badbit); }
 341           if (__err)
 342             this->setstate(__err);
 343         }
 344       return *this;
 345     }
 346
 347   template<typename _CharT, typename _Traits>
 348     basic_istream<_CharT, _Traits>&
 349     basic_istream<_CharT, _Traits>::
 350     operator>>(double& __n)
 351     {
 352       sentry __cerb(*this, false);
 353       if (__cerb)
 354         {
 355           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 356           try
 357             {
 358               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 359               __ng.get(*this, 0, *this, __err, __n);
 360             }
 361           catch(...)
 362             { this->_M_setstate(ios_base::badbit); }
 363           if (__err)
 364             this->setstate(__err);
 365         }
 366       return *this;
 367     }
 368
 369   template<typename _CharT, typename _Traits>
 370     basic_istream<_CharT, _Traits>&
 371     basic_istream<_CharT, _Traits>::
 372     operator>>(long double& __n)
 373     {
 374       sentry __cerb(*this, false);
 375       if (__cerb)
 376         {
 377           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 378           try
 379             {
 380               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 381               __ng.get(*this, 0, *this, __err, __n);
 382             }
 383           catch(...)
 384             { this->_M_setstate(ios_base::badbit); }
 385           if (__err)
 386             this->setstate(__err);
 387         }
 388       return *this;
 389     }
 390
 391   template<typename _CharT, typename _Traits>
 392     basic_istream<_CharT, _Traits>&
 393     basic_istream<_CharT, _Traits>::
 394     operator>>(void*& __n)
 395     {
 396       sentry __cerb(*this, false);
 397       if (__cerb)
 398         {
 399           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 400           try
 401             {
 402               const __num_get_type& __ng = __check_facet(this->_M_num_get);
 403               __ng.get(*this, 0, *this, __err, __n);
 404             }
 405           catch(...)
 406             { this->_M_setstate(ios_base::badbit); }
 407           if (__err)
 408             this->setstate(__err);
 409         }
 410       return *this;
 411     }
 412
 413   template<typename _CharT, typename _Traits>
 414     basic_istream<_CharT, _Traits>&
 415     basic_istream<_CharT, _Traits>::
 416     operator>>(__streambuf_type* __sbout)
 417     {
 418       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 419       sentry __cerb(*this, false);
 420       if (__cerb && __sbout)
 421         {
 422           try
 423             {
 424               if (!__copy_streambufs(this->rdbuf(), __sbout))
 425                 __err |= ios_base::failbit;
 426             }
 427           catch(...)
 428             { this->_M_setstate(ios_base::failbit); }
 429         }
 430       else if (!__sbout)
 431         __err |= ios_base::failbit;
 432       if (__err)
 433         this->setstate(__err);
 434       return *this;
 435     }
 436
 437   template<typename _CharT, typename _Traits>
 438     typename basic_istream<_CharT, _Traits>::int_type
 439     basic_istream<_CharT, _Traits>::
 440     get(void)
 441     {
 442       const int_type __eof = traits_type::eof();
 443       int_type __c = __eof;
 444       _M_gcount = 0;
 445       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 446       sentry __cerb(*this, true);
 447       if (__cerb)
 448         {
 449           try
 450             {
 451               __c = this->rdbuf()->sbumpc();
 452               // 27.6.1.1 paragraph 3
 453               if (!traits_type::eq_int_type(__c, __eof))
 454                 _M_gcount = 1;
 455               else
 456                 __err |= ios_base::eofbit;
 457             }
 458           catch(...)
 459             { this->_M_setstate(ios_base::badbit); }
 460         }
 461       if (!_M_gcount)
 462         __err |= ios_base::failbit;
 463       if (__err)
 464         this->setstate(__err);
 465       return __c;
 466     }
 467
 468   template<typename _CharT, typename _Traits>
 469     basic_istream<_CharT, _Traits>&
 470     basic_istream<_CharT, _Traits>::
 471     get(char_type& __c)
 472     {
 473       _M_gcount = 0;
 474       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 475       sentry __cerb(*this, true);
 476       if (__cerb)
 477         {
 478           try
 479             {
 480               const int_type __cb = this->rdbuf()->sbumpc();
 481               // 27.6.1.1 paragraph 3
 482               if (!traits_type::eq_int_type(__cb, traits_type::eof()))
 483                 {
 484                   _M_gcount = 1;
 485                   __c = traits_type::to_char_type(__cb);
 486                 }
 487               else
 488                 __err |= ios_base::eofbit;
 489             }
 490           catch(...)
 491             { this->_M_setstate(ios_base::badbit); }
 492         }
 493       if (!_M_gcount)
 494         __err |= ios_base::failbit;
 495       if (__err)
 496         this->setstate(__err);
 497       return *this;
 498     }
 499
 500   template<typename _CharT, typename _Traits>
 501     basic_istream<_CharT, _Traits>&
 502     basic_istream<_CharT, _Traits>::
 503     get(char_type* __s, streamsize __n, char_type __delim)
 504     {
 505       _M_gcount = 0;
 506       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 507       sentry __cerb(*this, true);
 508       if (__cerb)
 509         {
 510           try
 511             {
 512               const int_type __idelim = traits_type::to_int_type(__delim);
 513               const int_type __eof = traits_type::eof();
 514               __streambuf_type* __sb = this->rdbuf();
 515               int_type __c = __sb->sgetc();
 516
 517               while (_M_gcount + 1 < __n
 518                      && !traits_type::eq_int_type(__c, __eof)
 519                      && !traits_type::eq_int_type(__c, __idelim))
 520                 {
 521                   *__s++ = traits_type::to_char_type(__c);
 522                   __c = __sb->snextc();
 523                   ++_M_gcount;
 524                 }
 525               if (traits_type::eq_int_type(__c, __eof))
 526                 __err |= ios_base::eofbit;
 527             }
 528           catch(...)
 529             { this->_M_setstate(ios_base::badbit); }
 530         }
 531       *__s = char_type();
 532       if (!_M_gcount)
 533         __err |= ios_base::failbit;
 534       if (__err)
 535         this->setstate(__err);
 536       return *this;
 537     }
 538
 539   template<typename _CharT, typename _Traits>
 540     basic_istream<_CharT, _Traits>&
 541     basic_istream<_CharT, _Traits>::
 542     get(__streambuf_type& __sb, char_type __delim)
 543     {
 544       _M_gcount = 0;
 545       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 546       sentry __cerb(*this, true);
 547       if (__cerb)
 548         {
 549           try
 550             {
 551               const int_type __idelim = traits_type::to_int_type(__delim);
 552               const int_type __eof = traits_type::eof();
 553               __streambuf_type* __this_sb = this->rdbuf();
 554               int_type __c = __this_sb->sgetc();
 555               char_type __c2 = traits_type::to_char_type(__c);
 556
 557               while (!traits_type::eq_int_type(__c, __eof)
 558                      && !traits_type::eq_int_type(__c, __idelim)
 559                      && !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
 560                 {
 561                   ++_M_gcount;
 562                   __c = __this_sb->snextc();
 563                   __c2 = traits_type::to_char_type(__c);
 564                 }
 565               if (traits_type::eq_int_type(__c, __eof))
 566                 __err |= ios_base::eofbit;
 567             }
 568           catch(...)
 569             { this->_M_setstate(ios_base::badbit); }
 570         }
 571       if (!_M_gcount)
 572         __err |= ios_base::failbit;
 573       if (__err)
 574         this->setstate(__err);
 575       return *this;
 576     }
 577
 578   template<typename _CharT, typename _Traits>
 579     basic_istream<_CharT, _Traits>&
 580     basic_istream<_CharT, _Traits>::
 581     getline(char_type* __s, streamsize __n, char_type __delim)
 582     {
 583       _M_gcount = 0;
 584       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 585       sentry __cerb(*this, true);
 586       if (__cerb)
 587         {
 588           try
 589             {
 590               const int_type __idelim = traits_type::to_int_type(__delim);
 591               const int_type __eof = traits_type::eof();
 592               __streambuf_type* __sb = this->rdbuf();
 593               int_type __c = __sb->sgetc();
 594               --__n;
 595
 596               while (_M_gcount < __n
 597                      && !traits_type::eq_int_type(__c, __eof)
 598                      && !traits_type::eq_int_type(__c, __idelim))
 599                 {
 600                   streamsize __size = std::min(streamsize(__sb->egptr()
 601                                                           - __sb->gptr()),
 602                                                __n - _M_gcount);
 603                   if (__size > 1)
 604                     {
 605                       const char_type* __p = traits_type::find(__sb->gptr(),
 606                                                                __size,
 607                                                                __delim);
 608                       if (__p)
 609                         __size = __p - __sb->gptr();
 610                       traits_type::copy(__s, __sb->gptr(), __size);
 611                       __s += __size;
 612                       __sb->gbump(__size);
 613                       _M_gcount += __size;
 614                       __c = __sb->sgetc();
 615                     }
 616                   else
 617                     {
 618                       *__s++ = traits_type::to_char_type(__c);
 619                       __c = __sb->snextc();
 620                       ++_M_gcount;
 621                     }
 622                 }
 623
 624               if (traits_type::eq_int_type(__c, __eof))
 625                 __err |= ios_base::eofbit;
 626               else if (traits_type::eq_int_type(__c, __idelim))
 627                 {
 628                   __sb->sbumpc();
 629                   ++_M_gcount;
 630                 }
 631               else
 632                 __err |= ios_base::failbit;
 633             }
 634           catch(...)
 635             { this->_M_setstate(ios_base::badbit); }
 636         }
 637       *__s = char_type();
 638       if (!_M_gcount)
 639         __err |= ios_base::failbit;
 640       if (__err)
 641         this->setstate(__err);
 642       return *this;
 643     }
 644
 645   template<typename _CharT, typename _Traits>
 646     basic_istream<_CharT, _Traits>&
 647     basic_istream<_CharT, _Traits>::
 648     ignore(streamsize __n, int_type __delim)
 649     {
 650       _M_gcount = 0;
 651       sentry __cerb(*this, true);
 652       if (__cerb && __n > 0)
 653         {
 654           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 655           try
 656             {
 657               const int_type __eof = traits_type::eof();
 658               __streambuf_type* __sb = this->rdbuf();
 659               int_type __c;
 660
 661               while (_M_gcount < __n
 662                      && !traits_type::eq_int_type(__c = __sb->sbumpc(), __eof))
 663                 {
 664                   ++_M_gcount;
 665                   if (traits_type::eq_int_type(__c, __delim))
 666                     break;
 667                 }
 668               if (traits_type::eq_int_type(__c, __eof))
 669                 __err |= ios_base::eofbit;
 670             }
 671           catch(...)
 672             { this->_M_setstate(ios_base::badbit); }
 673           if (__err)
 674             this->setstate(__err);
 675         }
 676       return *this;
 677     }
 678
 679   template<typename _CharT, typename _Traits>
 680     typename basic_istream<_CharT, _Traits>::int_type
 681     basic_istream<_CharT, _Traits>::
 682     peek(void)
 683     {
 684       int_type __c = traits_type::eof();
 685       _M_gcount = 0;
 686       sentry __cerb(*this, true);
 687       if (__cerb)
 688         {
 689           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 690           try
 691             {
 692               __c = this->rdbuf()->sgetc();
 693               if (traits_type::eq_int_type(__c, traits_type::eof()))
 694                 __err |= ios_base::eofbit;
 695             }
 696           catch(...)
 697             { this->_M_setstate(ios_base::badbit); }
 698           if (__err)
 699             this->setstate(__err);
 700         }
 701       return __c;
 702     }
 703
 704   template<typename _CharT, typename _Traits>
 705     basic_istream<_CharT, _Traits>&
 706     basic_istream<_CharT, _Traits>::
 707     read(char_type* __s, streamsize __n)
 708     {
 709       _M_gcount = 0;
 710       sentry __cerb(*this, true);
 711       if (__cerb)
 712         {
 713           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 714           try
 715             {
 716               _M_gcount = this->rdbuf()->sgetn(__s, __n);
 717               if (_M_gcount != __n)
 718                 __err |= (ios_base::eofbit | ios_base::failbit);
 719             }
 720           catch(...)
 721             { this->_M_setstate(ios_base::badbit); }
 722           if (__err)
 723             this->setstate(__err);
 724         }
 725       return *this;
 726     }
 727
 728   template<typename _CharT, typename _Traits>
 729     streamsize
 730     basic_istream<_CharT, _Traits>::
 731     readsome(char_type* __s, streamsize __n)
 732     {
 733       _M_gcount = 0;
 734       sentry __cerb(*this, true);
 735       if (__cerb)
 736         {
 737           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 738           try
 739             {
 740               // Cannot compare int_type with streamsize generically.
 741               const streamsize __num = this->rdbuf()->in_avail();
 742               if (__num > 0)
 743                 _M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
 744               else if (__num == -1)
 745                 __err |= ios_base::eofbit;
 746             }
 747           catch(...)
 748             { this->_M_setstate(ios_base::badbit); }
 749           if (__err)
 750             this->setstate(__err);
 751         }
 752       return _M_gcount;
 753     }
 754
 755   template<typename _CharT, typename _Traits>
 756     basic_istream<_CharT, _Traits>&
 757     basic_istream<_CharT, _Traits>::
 758     putback(char_type __c)
 759     {
 760       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 761       // 60. What is a formatted input function?
 762       _M_gcount = 0;
 763       sentry __cerb(*this, true);
 764       if (__cerb)
 765         {
 766           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 767           try
 768             {
 769               const int_type __eof = traits_type::eof();
 770               __streambuf_type* __sb = this->rdbuf();
 771               if (!__sb
 772                   || traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
 773                 __err |= ios_base::badbit;
 774             }
 775           catch(...)
 776             { this->_M_setstate(ios_base::badbit); }
 777           if (__err)
 778             this->setstate(__err);
 779         }
 780       return *this;
 781     }
 782
 783   template<typename _CharT, typename _Traits>
 784     basic_istream<_CharT, _Traits>&
 785     basic_istream<_CharT, _Traits>::
 786     unget(void)
 787     {
 788       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 789       // 60. What is a formatted input function?
 790       _M_gcount = 0;
 791       sentry __cerb(*this, true);
 792       if (__cerb)
 793         {
 794           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 795           try
 796             {
 797               const int_type __eof = traits_type::eof();
 798               __streambuf_type* __sb = this->rdbuf();
 799               if (!__sb
 800                   || traits_type::eq_int_type(__sb->sungetc(), __eof))
 801                 __err |= ios_base::badbit;
 802             }
 803           catch(...)
 804             { this->_M_setstate(ios_base::badbit); }
 805           if (__err)
 806             this->setstate(__err);
 807         }
 808       return *this;
 809     }
 810
 811   template<typename _CharT, typename _Traits>
 812     int
 813     basic_istream<_CharT, _Traits>::
 814     sync(void)
 815     {
 816       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 817       // DR60.  Do not change _M_gcount.
 818       int __ret = -1;
 819       sentry __cerb(*this, true);
 820       if (__cerb)
 821         {
 822           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 823           try
 824             {
 825               __streambuf_type* __sb = this->rdbuf();
 826               if (__sb)
 827                 {
 828                   if (__sb->pubsync() == -1)
 829                     __err |= ios_base::badbit;
 830                   else
 831                     __ret = 0;
 832                 }
 833             }
 834           catch(...)
 835             { this->_M_setstate(ios_base::badbit); }
 836           if (__err)
 837             this->setstate(__err);
 838         }
 839       return __ret;
 840     }
 841
 842   template<typename _CharT, typename _Traits>
 843     typename basic_istream<_CharT, _Traits>::pos_type
 844     basic_istream<_CharT, _Traits>::
 845     tellg(void)
 846     {
 847       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 848       // DR60.  Do not change _M_gcount.
 849       pos_type __ret = pos_type(-1);
 850       try
 851         {
 852           if (!this->fail())
 853             __ret = this->rdbuf()->pubseekoff(0, ios_base::cur, ios_base::in);
 854         }
 855       catch(...)
 856         { this->_M_setstate(ios_base::badbit); }
 857       return __ret;
 858     }
 859
 860   template<typename _CharT, typename _Traits>
 861     basic_istream<_CharT, _Traits>&
 862     basic_istream<_CharT, _Traits>::
 863     seekg(pos_type __pos)
 864     {
 865       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 866       // DR60.  Do not change _M_gcount.
 867       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 868       try
 869         {
 870           if (!this->fail())
 871             {
 872               // 136.  seekp, seekg setting wrong streams?
 873               const pos_type __p = this->rdbuf()->pubseekpos(__pos,
 874                                                              ios_base::in);
 875
 876               // 129. Need error indication from seekp() and seekg()
 877               if (__p == pos_type(off_type(-1)))
 878                 __err |= ios_base::failbit;
 879             }
 880         }
 881       catch(...)
 882         { this->_M_setstate(ios_base::badbit); }
 883       if (__err)
 884         this->setstate(__err);
 885       return *this;
 886     }
 887
 888   template<typename _CharT, typename _Traits>
 889     basic_istream<_CharT, _Traits>&
 890     basic_istream<_CharT, _Traits>::
 891     seekg(off_type __off, ios_base::seekdir __dir)
 892     {
 893       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 894       // DR60.  Do not change _M_gcount.
 895       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 896       try
 897         {
 898           if (!this->fail())
 899             {
 900               // 136.  seekp, seekg setting wrong streams?
 901               const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir,
 902                                                              ios_base::in);
 903
 904               // 129. Need error indication from seekp() and seekg()
 905               if (__p == pos_type(off_type(-1)))
 906                 __err |= ios_base::failbit;
 907             }
 908         }
 909       catch(...)
 910         { this->_M_setstate(ios_base::badbit); }
 911       if (__err)
 912         this->setstate(__err);
 913       return *this;
 914     }
 915
 916   // 27.6.1.2.3 Character extraction templates
 917   template<typename _CharT, typename _Traits>
 918     basic_istream<_CharT, _Traits>&
 919     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
 920     {
 921       typedef basic_istream<_CharT, _Traits>            __istream_type;
 922       typedef typename __istream_type::int_type         __int_type;
 923
 924       typename __istream_type::sentry __cerb(__in, false);
 925       if (__cerb)
 926         {
 927           ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 928           try
 929             {
 930               const __int_type __cb = __in.rdbuf()->sbumpc();
 931               if (!_Traits::eq_int_type(__cb, _Traits::eof()))
 932                 __c = _Traits::to_char_type(__cb);
 933               else
 934                 __err |= (ios_base::eofbit | ios_base::failbit);
 935             }
 936           catch(...)
 937             { __in._M_setstate(ios_base::badbit); }
 938           if (__err)
 939             __in.setstate(__err);
 940         }
 941       return __in;
 942     }
 943
 944   template<typename _CharT, typename _Traits>
 945     basic_istream<_CharT, _Traits>&
 946     operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
 947     {
 948       typedef basic_istream<_CharT, _Traits>            __istream_type;
 949       typedef typename __istream_type::__streambuf_type __streambuf_type;
 950       typedef typename _Traits::int_type                int_type;
 951       typedef _CharT                                    char_type;
 952       typedef ctype<_CharT>                             __ctype_type;
 953
 954       streamsize __extracted = 0;
 955       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
 956       typename __istream_type::sentry __cerb(__in, false);
 957       if (__cerb)
 958         {
 959           try
 960             {
 961               // Figure out how many characters to extract.
 962               streamsize __num = __in.width();
 963               if (__num <= 0)
 964                 __num = numeric_limits<streamsize>::max();
 965
 966               const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
 967
 968               const int_type __eof = _Traits::eof();
 969               __streambuf_type* __sb = __in.rdbuf();
 970               int_type __c = __sb->sgetc();
 971
 972               while (__extracted < __num - 1
 973                      && !_Traits::eq_int_type(__c, __eof)
 974                      && !__ct.is(ctype_base::space,
 975                                  _Traits::to_char_type(__c)))
 976                 {
 977                   *__s++ = _Traits::to_char_type(__c);
 978                   ++__extracted;
 979                   __c = __sb->snextc();
 980                 }
 981               if (_Traits::eq_int_type(__c, __eof))
 982                 __err |= ios_base::eofbit;
 983
 984               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 985               // 68.  Extractors for char* should store null at end
 986               *__s = char_type();
 987               __in.width(0);
 988             }
 989           catch(...)
 990             { __in._M_setstate(ios_base::badbit); }
 991         }
 992       if (!__extracted)
 993         __err |= ios_base::failbit;
 994       if (__err)
 995         __in.setstate(__err);
 996       return __in;
 997     }
 998
 999   // 27.6.1.4 Standard basic_istream manipulators
1000   template<typename _CharT, typename _Traits>
1001     basic_istream<_CharT,_Traits>&
1002     ws(basic_istream<_CharT,_Traits>& __in)
1003     {
1004       typedef basic_istream<_CharT, _Traits>            __istream_type;
1005       typedef typename __istream_type::__streambuf_type __streambuf_type;
1006       typedef typename __istream_type::__ctype_type     __ctype_type;
1007       typedef typename __istream_type::int_type         __int_type;
1008
1009       const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
1010       const __int_type __eof = _Traits::eof();
1011       __streambuf_type* __sb = __in.rdbuf();
1012       __int_type __c = __sb->sgetc();
1013
1014       while (!_Traits::eq_int_type(__c, __eof)
1015              && __ct.is(ctype_base::space, _Traits::to_char_type(__c)))
1016         __c = __sb->snextc();
1017
1018        if (_Traits::eq_int_type(__c, __eof))
1019          __in.setstate(ios_base::eofbit);
1020       return __in;
1021     }
1022
1023   // 21.3.7.9 basic_string::getline and operators
1024   template<typename _CharT, typename _Traits, typename _Alloc>
1025     basic_istream<_CharT, _Traits>&
1026     operator>>(basic_istream<_CharT, _Traits>& __in,
1027                basic_string<_CharT, _Traits, _Alloc>& __str)
1028     {
1029       typedef basic_istream<_CharT, _Traits>            __istream_type;
1030       typedef typename __istream_type::int_type         __int_type;
1031       typedef typename __istream_type::__streambuf_type __streambuf_type;
1032       typedef typename __istream_type::__ctype_type     __ctype_type;
1033       typedef basic_string<_CharT, _Traits, _Alloc>     __string_type;
1034       typedef typename __string_type::size_type         __size_type;
1035
1036       __size_type __extracted = 0;
1037       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
1038       typename __istream_type::sentry __cerb(__in, false);
1039       if (__cerb)
1040         {
1041           try
1042             {
1043               // Avoid reallocation for common case.
1044               __str.erase();
1045               _CharT __buf[128];
1046               __size_type __len = 0;
1047               const streamsize __w = __in.width();
1048               const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
1049                                               : __str.max_size();
1050               const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
1051               const __int_type __eof = _Traits::eof();
1052               __streambuf_type* __sb = __in.rdbuf();
1053               __int_type __c = __sb->sgetc();
1054
1055               while (__extracted < __n
1056                      && !_Traits::eq_int_type(__c, __eof)
1057                      && !__ct.is(ctype_base::space, _Traits::to_char_type(__c)))
1058                 {
1059                   if (__len == sizeof(__buf) / sizeof(_CharT))
1060                     {
1061                       __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
1062                       __len = 0;
1063                     }
1064                   __buf[__len++] = _Traits::to_char_type(__c);
1065                   ++__extracted;
1066                   __c = __sb->snextc();
1067                 }
1068               __str.append(__buf, __len);
1069
1070               if (_Traits::eq_int_type(__c, __eof))
1071                 __err |= ios_base::eofbit;
1072               __in.width(0);
1073             }
1074           catch(...)
1075             {
1076               // _GLIBCXX_RESOLVE_LIB_DEFECTS
1077               // 91. Description of operator>> and getline() for string<>
1078               // might cause endless loop
1079               __in._M_setstate(ios_base::badbit);
1080             }
1081         }
1082       // 211.  operator>>(istream&, string&) doesn't set failbit
1083       if (!__extracted)
1084         __err |= ios_base::failbit;
1085       if (__err)
1086         __in.setstate(__err);
1087       return __in;
1088     }
1089
1090   template<typename _CharT, typename _Traits, typename _Alloc>
1091     basic_istream<_CharT, _Traits>&
1092     getline(basic_istream<_CharT, _Traits>& __in,
1093             basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
1094     {
1095       typedef basic_istream<_CharT, _Traits>            __istream_type;
1096       typedef typename __istream_type::int_type         __int_type;
1097       typedef typename __istream_type::__streambuf_type __streambuf_type;
1098       typedef typename __istream_type::__ctype_type     __ctype_type;
1099       typedef basic_string<_CharT, _Traits, _Alloc>     __string_type;
1100       typedef typename __string_type::size_type         __size_type;
1101
1102       __size_type __extracted = 0;
1103       const __size_type __n = __str.max_size();
1104       bool __testdelim = false;
1105       ios_base::iostate __err = ios_base::iostate(ios_base::goodbit);
1106       typename __istream_type::sentry __cerb(__in, true);
1107       if (__cerb)
1108         {
1109           try
1110             {
1111               // Avoid reallocation for common case.
1112               __str.erase();
1113               _CharT __buf[128];
1114               __size_type __len = 0;
1115               const __int_type __idelim = _Traits::to_int_type(__delim);
1116               const __int_type __eof = _Traits::eof();
1117               __streambuf_type* __sb = __in.rdbuf();
1118               __int_type __c = __sb->sgetc();
1119
1120               while (__extracted < __n
1121                      && !_Traits::eq_int_type(__c, __eof)
1122                      && !_Traits::eq_int_type(__c, __idelim))
1123                 {
1124                   if (__len == sizeof(__buf) / sizeof(_CharT))
1125                     {
1126                       __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
1127                       __len = 0;
1128                     }
1129                   __buf[__len++] = _Traits::to_char_type(__c);
1130                   ++__extracted;
1131                   __c = __sb->snextc();
1132                 }
1133               __str.append(__buf, __len);
1134
1135               if (_Traits::eq_int_type(__c, __eof))
1136                 __err |= ios_base::eofbit;
1137               else if (_Traits::eq_int_type(__c, __idelim))
1138                 {
1139                   __sb->sbumpc();
1140                   ++__extracted;
1141                 }
1142               else
1143                 __err |= ios_base::failbit;
1144             }
1145           catch(...)
1146             {
1147               // _GLIBCXX_RESOLVE_LIB_DEFECTS
1148               // 91. Description of operator>> and getline() for string<>
1149               // might cause endless loop
1150               __in._M_setstate(ios_base::badbit);
1151             }
1152         }
1153       if (!__extracted)
1154         __err |= ios_base::failbit;
1155       if (__err)
1156         __in.setstate(__err);
1157       return __in;
1158     }
1159
1160   template<class _CharT, class _Traits, class _Alloc>
1161     inline basic_istream<_CharT,_Traits>&
1162     getline(basic_istream<_CharT, _Traits>& __in,
1163             basic_string<_CharT,_Traits,_Alloc>& __str)
1164     { return getline(__in, __str, __in.widen('\n')); }
1165
1166   // Inhibit implicit instantiations for required instantiations,
1167   // which are defined via explicit instantiations elsewhere.
1168   // NB:  This syntax is a GNU extension.
1169 #if _GLIBCXX_EXTERN_TEMPLATE
1170   extern template class basic_istream<char>;
1171   extern template istream& ws(istream&);
1172   extern template istream& operator>>(istream&, char&);
1173   extern template istream& operator>>(istream&, char*);
1174   extern template istream& operator>>(istream&, unsigned char&);
1175   extern template istream& operator>>(istream&, signed char&);
1176   extern template istream& operator>>(istream&, unsigned char*);
1177   extern template istream& operator>>(istream&, signed char*);
1178
1179 #ifdef _GLIBCXX_USE_WCHAR_T
1180   extern template class basic_istream<wchar_t>;
1181   extern template wistream& ws(wistream&);
1182   extern template wistream& operator>>(wistream&, wchar_t&);
1183   extern template wistream& operator>>(wistream&, wchar_t*);
1184 #endif
1185 #endif
1186 } // namespace std
1187
1188 #endif