libstdc++
istream.tcc
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1 // istream classes -*- C++ -*-
2 
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
4 // 2006, 2007, 2008, 2009, 2010, 2011
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 bits/istream.tcc
28  * This is an internal header file, included by other library headers.
29  * Do not attempt to use it directly. @headername{istream}
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 <bits/cxxabi_forced.h>
42 
43 namespace std _GLIBCXX_VISIBILITY(default)
44 {
45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
46 
47  template<typename _CharT, typename _Traits>
48  basic_istream<_CharT, _Traits>::sentry::
49  sentry(basic_istream<_CharT, _Traits>& __in, bool __noskip) : _M_ok(false)
50  {
51  ios_base::iostate __err = ios_base::goodbit;
52  if (__in.good())
53  {
54  if (__in.tie())
55  __in.tie()->flush();
56  if (!__noskip && bool(__in.flags() & ios_base::skipws))
57  {
58  const __int_type __eof = traits_type::eof();
59  __streambuf_type* __sb = __in.rdbuf();
60  __int_type __c = __sb->sgetc();
61 
62  const __ctype_type& __ct = __check_facet(__in._M_ctype);
63  while (!traits_type::eq_int_type(__c, __eof)
64  && __ct.is(ctype_base::space,
65  traits_type::to_char_type(__c)))
66  __c = __sb->snextc();
67 
68  // _GLIBCXX_RESOLVE_LIB_DEFECTS
69  // 195. Should basic_istream::sentry's constructor ever
70  // set eofbit?
71  if (traits_type::eq_int_type(__c, __eof))
72  __err |= ios_base::eofbit;
73  }
74  }
75 
76  if (__in.good() && __err == ios_base::goodbit)
77  _M_ok = true;
78  else
79  {
80  __err |= ios_base::failbit;
81  __in.setstate(__err);
82  }
83  }
84 
85  template<typename _CharT, typename _Traits>
86  template<typename _ValueT>
87  basic_istream<_CharT, _Traits>&
88  basic_istream<_CharT, _Traits>::
89  _M_extract(_ValueT& __v)
90  {
91  sentry __cerb(*this, false);
92  if (__cerb)
93  {
94  ios_base::iostate __err = ios_base::goodbit;
95  __try
96  {
97  const __num_get_type& __ng = __check_facet(this->_M_num_get);
98  __ng.get(*this, 0, *this, __err, __v);
99  }
100  __catch(__cxxabiv1::__forced_unwind&)
101  {
102  this->_M_setstate(ios_base::badbit);
103  __throw_exception_again;
104  }
105  __catch(...)
106  { this->_M_setstate(ios_base::badbit); }
107  if (__err)
108  this->setstate(__err);
109  }
110  return *this;
111  }
112 
113  template<typename _CharT, typename _Traits>
114  basic_istream<_CharT, _Traits>&
115  basic_istream<_CharT, _Traits>::
116  operator>>(short& __n)
117  {
118  // _GLIBCXX_RESOLVE_LIB_DEFECTS
119  // 118. basic_istream uses nonexistent num_get member functions.
120  sentry __cerb(*this, false);
121  if (__cerb)
122  {
123  ios_base::iostate __err = ios_base::goodbit;
124  __try
125  {
126  long __l;
127  const __num_get_type& __ng = __check_facet(this->_M_num_get);
128  __ng.get(*this, 0, *this, __err, __l);
129 
130  // _GLIBCXX_RESOLVE_LIB_DEFECTS
131  // 696. istream::operator>>(int&) broken.
132  if (__l < __gnu_cxx::__numeric_traits<short>::__min)
133  {
134  __err |= ios_base::failbit;
135  __n = __gnu_cxx::__numeric_traits<short>::__min;
136  }
137  else if (__l > __gnu_cxx::__numeric_traits<short>::__max)
138  {
139  __err |= ios_base::failbit;
140  __n = __gnu_cxx::__numeric_traits<short>::__max;
141  }
142  else
143  __n = short(__l);
144  }
145  __catch(__cxxabiv1::__forced_unwind&)
146  {
147  this->_M_setstate(ios_base::badbit);
148  __throw_exception_again;
149  }
150  __catch(...)
151  { this->_M_setstate(ios_base::badbit); }
152  if (__err)
153  this->setstate(__err);
154  }
155  return *this;
156  }
157 
158  template<typename _CharT, typename _Traits>
159  basic_istream<_CharT, _Traits>&
160  basic_istream<_CharT, _Traits>::
161  operator>>(int& __n)
162  {
163  // _GLIBCXX_RESOLVE_LIB_DEFECTS
164  // 118. basic_istream uses nonexistent num_get member functions.
165  sentry __cerb(*this, false);
166  if (__cerb)
167  {
168  ios_base::iostate __err = ios_base::goodbit;
169  __try
170  {
171  long __l;
172  const __num_get_type& __ng = __check_facet(this->_M_num_get);
173  __ng.get(*this, 0, *this, __err, __l);
174 
175  // _GLIBCXX_RESOLVE_LIB_DEFECTS
176  // 696. istream::operator>>(int&) broken.
177  if (__l < __gnu_cxx::__numeric_traits<int>::__min)
178  {
179  __err |= ios_base::failbit;
180  __n = __gnu_cxx::__numeric_traits<int>::__min;
181  }
182  else if (__l > __gnu_cxx::__numeric_traits<int>::__max)
183  {
184  __err |= ios_base::failbit;
185  __n = __gnu_cxx::__numeric_traits<int>::__max;
186  }
187  else
188  __n = int(__l);
189  }
190  __catch(__cxxabiv1::__forced_unwind&)
191  {
192  this->_M_setstate(ios_base::badbit);
193  __throw_exception_again;
194  }
195  __catch(...)
196  { this->_M_setstate(ios_base::badbit); }
197  if (__err)
198  this->setstate(__err);
199  }
200  return *this;
201  }
202 
203  template<typename _CharT, typename _Traits>
204  basic_istream<_CharT, _Traits>&
205  basic_istream<_CharT, _Traits>::
206  operator>>(__streambuf_type* __sbout)
207  {
208  ios_base::iostate __err = ios_base::goodbit;
209  sentry __cerb(*this, false);
210  if (__cerb && __sbout)
211  {
212  __try
213  {
214  bool __ineof;
215  if (!__copy_streambufs_eof(this->rdbuf(), __sbout, __ineof))
216  __err |= ios_base::failbit;
217  if (__ineof)
218  __err |= ios_base::eofbit;
219  }
220  __catch(__cxxabiv1::__forced_unwind&)
221  {
222  this->_M_setstate(ios_base::failbit);
223  __throw_exception_again;
224  }
225  __catch(...)
226  { this->_M_setstate(ios_base::failbit); }
227  }
228  else if (!__sbout)
229  __err |= ios_base::failbit;
230  if (__err)
231  this->setstate(__err);
232  return *this;
233  }
234 
235  template<typename _CharT, typename _Traits>
236  typename basic_istream<_CharT, _Traits>::int_type
237  basic_istream<_CharT, _Traits>::
238  get(void)
239  {
240  const int_type __eof = traits_type::eof();
241  int_type __c = __eof;
242  _M_gcount = 0;
243  ios_base::iostate __err = ios_base::goodbit;
244  sentry __cerb(*this, true);
245  if (__cerb)
246  {
247  __try
248  {
249  __c = this->rdbuf()->sbumpc();
250  // 27.6.1.1 paragraph 3
251  if (!traits_type::eq_int_type(__c, __eof))
252  _M_gcount = 1;
253  else
254  __err |= ios_base::eofbit;
255  }
256  __catch(__cxxabiv1::__forced_unwind&)
257  {
258  this->_M_setstate(ios_base::badbit);
259  __throw_exception_again;
260  }
261  __catch(...)
262  { this->_M_setstate(ios_base::badbit); }
263  }
264  if (!_M_gcount)
265  __err |= ios_base::failbit;
266  if (__err)
267  this->setstate(__err);
268  return __c;
269  }
270 
271  template<typename _CharT, typename _Traits>
272  basic_istream<_CharT, _Traits>&
273  basic_istream<_CharT, _Traits>::
274  get(char_type& __c)
275  {
276  _M_gcount = 0;
277  ios_base::iostate __err = ios_base::goodbit;
278  sentry __cerb(*this, true);
279  if (__cerb)
280  {
281  __try
282  {
283  const int_type __cb = this->rdbuf()->sbumpc();
284  // 27.6.1.1 paragraph 3
285  if (!traits_type::eq_int_type(__cb, traits_type::eof()))
286  {
287  _M_gcount = 1;
288  __c = traits_type::to_char_type(__cb);
289  }
290  else
291  __err |= ios_base::eofbit;
292  }
293  __catch(__cxxabiv1::__forced_unwind&)
294  {
295  this->_M_setstate(ios_base::badbit);
296  __throw_exception_again;
297  }
298  __catch(...)
299  { this->_M_setstate(ios_base::badbit); }
300  }
301  if (!_M_gcount)
302  __err |= ios_base::failbit;
303  if (__err)
304  this->setstate(__err);
305  return *this;
306  }
307 
308  template<typename _CharT, typename _Traits>
309  basic_istream<_CharT, _Traits>&
310  basic_istream<_CharT, _Traits>::
311  get(char_type* __s, streamsize __n, char_type __delim)
312  {
313  _M_gcount = 0;
314  ios_base::iostate __err = ios_base::goodbit;
315  sentry __cerb(*this, true);
316  if (__cerb)
317  {
318  __try
319  {
320  const int_type __idelim = traits_type::to_int_type(__delim);
321  const int_type __eof = traits_type::eof();
322  __streambuf_type* __sb = this->rdbuf();
323  int_type __c = __sb->sgetc();
324 
325  while (_M_gcount + 1 < __n
326  && !traits_type::eq_int_type(__c, __eof)
327  && !traits_type::eq_int_type(__c, __idelim))
328  {
329  *__s++ = traits_type::to_char_type(__c);
330  ++_M_gcount;
331  __c = __sb->snextc();
332  }
333  if (traits_type::eq_int_type(__c, __eof))
334  __err |= ios_base::eofbit;
335  }
336  __catch(__cxxabiv1::__forced_unwind&)
337  {
338  this->_M_setstate(ios_base::badbit);
339  __throw_exception_again;
340  }
341  __catch(...)
342  { this->_M_setstate(ios_base::badbit); }
343  }
344  // _GLIBCXX_RESOLVE_LIB_DEFECTS
345  // 243. get and getline when sentry reports failure.
346  if (__n > 0)
347  *__s = char_type();
348  if (!_M_gcount)
349  __err |= ios_base::failbit;
350  if (__err)
351  this->setstate(__err);
352  return *this;
353  }
354 
355  template<typename _CharT, typename _Traits>
356  basic_istream<_CharT, _Traits>&
357  basic_istream<_CharT, _Traits>::
358  get(__streambuf_type& __sb, char_type __delim)
359  {
360  _M_gcount = 0;
361  ios_base::iostate __err = ios_base::goodbit;
362  sentry __cerb(*this, true);
363  if (__cerb)
364  {
365  __try
366  {
367  const int_type __idelim = traits_type::to_int_type(__delim);
368  const int_type __eof = traits_type::eof();
369  __streambuf_type* __this_sb = this->rdbuf();
370  int_type __c = __this_sb->sgetc();
371  char_type __c2 = traits_type::to_char_type(__c);
372 
373  while (!traits_type::eq_int_type(__c, __eof)
374  && !traits_type::eq_int_type(__c, __idelim)
375  && !traits_type::eq_int_type(__sb.sputc(__c2), __eof))
376  {
377  ++_M_gcount;
378  __c = __this_sb->snextc();
379  __c2 = traits_type::to_char_type(__c);
380  }
381  if (traits_type::eq_int_type(__c, __eof))
382  __err |= ios_base::eofbit;
383  }
384  __catch(__cxxabiv1::__forced_unwind&)
385  {
386  this->_M_setstate(ios_base::badbit);
387  __throw_exception_again;
388  }
389  __catch(...)
390  { this->_M_setstate(ios_base::badbit); }
391  }
392  if (!_M_gcount)
393  __err |= ios_base::failbit;
394  if (__err)
395  this->setstate(__err);
396  return *this;
397  }
398 
399  template<typename _CharT, typename _Traits>
400  basic_istream<_CharT, _Traits>&
401  basic_istream<_CharT, _Traits>::
402  getline(char_type* __s, streamsize __n, char_type __delim)
403  {
404  _M_gcount = 0;
405  ios_base::iostate __err = ios_base::goodbit;
406  sentry __cerb(*this, true);
407  if (__cerb)
408  {
409  __try
410  {
411  const int_type __idelim = traits_type::to_int_type(__delim);
412  const int_type __eof = traits_type::eof();
413  __streambuf_type* __sb = this->rdbuf();
414  int_type __c = __sb->sgetc();
415 
416  while (_M_gcount + 1 < __n
417  && !traits_type::eq_int_type(__c, __eof)
418  && !traits_type::eq_int_type(__c, __idelim))
419  {
420  *__s++ = traits_type::to_char_type(__c);
421  __c = __sb->snextc();
422  ++_M_gcount;
423  }
424  if (traits_type::eq_int_type(__c, __eof))
425  __err |= ios_base::eofbit;
426  else
427  {
428  if (traits_type::eq_int_type(__c, __idelim))
429  {
430  __sb->sbumpc();
431  ++_M_gcount;
432  }
433  else
434  __err |= ios_base::failbit;
435  }
436  }
437  __catch(__cxxabiv1::__forced_unwind&)
438  {
439  this->_M_setstate(ios_base::badbit);
440  __throw_exception_again;
441  }
442  __catch(...)
443  { this->_M_setstate(ios_base::badbit); }
444  }
445  // _GLIBCXX_RESOLVE_LIB_DEFECTS
446  // 243. get and getline when sentry reports failure.
447  if (__n > 0)
448  *__s = char_type();
449  if (!_M_gcount)
450  __err |= ios_base::failbit;
451  if (__err)
452  this->setstate(__err);
453  return *this;
454  }
455 
456  // We provide three overloads, since the first two are much simpler
457  // than the general case. Also, the latter two can thus adopt the
458  // same "batchy" strategy used by getline above.
459  template<typename _CharT, typename _Traits>
460  basic_istream<_CharT, _Traits>&
461  basic_istream<_CharT, _Traits>::
462  ignore(void)
463  {
464  _M_gcount = 0;
465  sentry __cerb(*this, true);
466  if (__cerb)
467  {
468  ios_base::iostate __err = ios_base::goodbit;
469  __try
470  {
471  const int_type __eof = traits_type::eof();
472  __streambuf_type* __sb = this->rdbuf();
473 
474  if (traits_type::eq_int_type(__sb->sbumpc(), __eof))
475  __err |= ios_base::eofbit;
476  else
477  _M_gcount = 1;
478  }
479  __catch(__cxxabiv1::__forced_unwind&)
480  {
481  this->_M_setstate(ios_base::badbit);
482  __throw_exception_again;
483  }
484  __catch(...)
485  { this->_M_setstate(ios_base::badbit); }
486  if (__err)
487  this->setstate(__err);
488  }
489  return *this;
490  }
491 
492  template<typename _CharT, typename _Traits>
493  basic_istream<_CharT, _Traits>&
494  basic_istream<_CharT, _Traits>::
495  ignore(streamsize __n)
496  {
497  _M_gcount = 0;
498  sentry __cerb(*this, true);
499  if (__cerb && __n > 0)
500  {
501  ios_base::iostate __err = ios_base::goodbit;
502  __try
503  {
504  const int_type __eof = traits_type::eof();
505  __streambuf_type* __sb = this->rdbuf();
506  int_type __c = __sb->sgetc();
507 
508  // N.B. On LFS-enabled platforms streamsize is still 32 bits
509  // wide: if we want to implement the standard mandated behavior
510  // for n == max() (see 27.6.1.3/24) we are at risk of signed
511  // integer overflow: thus these contortions. Also note that,
512  // by definition, when more than 2G chars are actually ignored,
513  // _M_gcount (the return value of gcount, that is) cannot be
514  // really correct, being unavoidably too small.
515  bool __large_ignore = false;
516  while (true)
517  {
518  while (_M_gcount < __n
519  && !traits_type::eq_int_type(__c, __eof))
520  {
521  ++_M_gcount;
522  __c = __sb->snextc();
523  }
524  if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
525  && !traits_type::eq_int_type(__c, __eof))
526  {
527  _M_gcount =
528  __gnu_cxx::__numeric_traits<streamsize>::__min;
529  __large_ignore = true;
530  }
531  else
532  break;
533  }
534 
535  if (__large_ignore)
536  _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
537 
538  if (traits_type::eq_int_type(__c, __eof))
539  __err |= ios_base::eofbit;
540  }
541  __catch(__cxxabiv1::__forced_unwind&)
542  {
543  this->_M_setstate(ios_base::badbit);
544  __throw_exception_again;
545  }
546  __catch(...)
547  { this->_M_setstate(ios_base::badbit); }
548  if (__err)
549  this->setstate(__err);
550  }
551  return *this;
552  }
553 
554  template<typename _CharT, typename _Traits>
555  basic_istream<_CharT, _Traits>&
556  basic_istream<_CharT, _Traits>::
557  ignore(streamsize __n, int_type __delim)
558  {
559  _M_gcount = 0;
560  sentry __cerb(*this, true);
561  if (__cerb && __n > 0)
562  {
563  ios_base::iostate __err = ios_base::goodbit;
564  __try
565  {
566  const int_type __eof = traits_type::eof();
567  __streambuf_type* __sb = this->rdbuf();
568  int_type __c = __sb->sgetc();
569 
570  // See comment above.
571  bool __large_ignore = false;
572  while (true)
573  {
574  while (_M_gcount < __n
575  && !traits_type::eq_int_type(__c, __eof)
576  && !traits_type::eq_int_type(__c, __delim))
577  {
578  ++_M_gcount;
579  __c = __sb->snextc();
580  }
581  if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max
582  && !traits_type::eq_int_type(__c, __eof)
583  && !traits_type::eq_int_type(__c, __delim))
584  {
585  _M_gcount =
586  __gnu_cxx::__numeric_traits<streamsize>::__min;
587  __large_ignore = true;
588  }
589  else
590  break;
591  }
592 
593  if (__large_ignore)
594  _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max;
595 
596  if (traits_type::eq_int_type(__c, __eof))
597  __err |= ios_base::eofbit;
598  else if (traits_type::eq_int_type(__c, __delim))
599  {
600  if (_M_gcount
601  < __gnu_cxx::__numeric_traits<streamsize>::__max)
602  ++_M_gcount;
603  __sb->sbumpc();
604  }
605  }
606  __catch(__cxxabiv1::__forced_unwind&)
607  {
608  this->_M_setstate(ios_base::badbit);
609  __throw_exception_again;
610  }
611  __catch(...)
612  { this->_M_setstate(ios_base::badbit); }
613  if (__err)
614  this->setstate(__err);
615  }
616  return *this;
617  }
618 
619  template<typename _CharT, typename _Traits>
620  typename basic_istream<_CharT, _Traits>::int_type
621  basic_istream<_CharT, _Traits>::
622  peek(void)
623  {
624  int_type __c = traits_type::eof();
625  _M_gcount = 0;
626  sentry __cerb(*this, true);
627  if (__cerb)
628  {
629  ios_base::iostate __err = ios_base::goodbit;
630  __try
631  {
632  __c = this->rdbuf()->sgetc();
633  if (traits_type::eq_int_type(__c, traits_type::eof()))
634  __err |= ios_base::eofbit;
635  }
636  __catch(__cxxabiv1::__forced_unwind&)
637  {
638  this->_M_setstate(ios_base::badbit);
639  __throw_exception_again;
640  }
641  __catch(...)
642  { this->_M_setstate(ios_base::badbit); }
643  if (__err)
644  this->setstate(__err);
645  }
646  return __c;
647  }
648 
649  template<typename _CharT, typename _Traits>
650  basic_istream<_CharT, _Traits>&
651  basic_istream<_CharT, _Traits>::
652  read(char_type* __s, streamsize __n)
653  {
654  _M_gcount = 0;
655  sentry __cerb(*this, true);
656  if (__cerb)
657  {
658  ios_base::iostate __err = ios_base::goodbit;
659  __try
660  {
661  _M_gcount = this->rdbuf()->sgetn(__s, __n);
662  if (_M_gcount != __n)
663  __err |= (ios_base::eofbit | ios_base::failbit);
664  }
665  __catch(__cxxabiv1::__forced_unwind&)
666  {
667  this->_M_setstate(ios_base::badbit);
668  __throw_exception_again;
669  }
670  __catch(...)
671  { this->_M_setstate(ios_base::badbit); }
672  if (__err)
673  this->setstate(__err);
674  }
675  return *this;
676  }
677 
678  template<typename _CharT, typename _Traits>
679  streamsize
680  basic_istream<_CharT, _Traits>::
681  readsome(char_type* __s, streamsize __n)
682  {
683  _M_gcount = 0;
684  sentry __cerb(*this, true);
685  if (__cerb)
686  {
687  ios_base::iostate __err = ios_base::goodbit;
688  __try
689  {
690  // Cannot compare int_type with streamsize generically.
691  const streamsize __num = this->rdbuf()->in_avail();
692  if (__num > 0)
693  _M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n));
694  else if (__num == -1)
695  __err |= ios_base::eofbit;
696  }
697  __catch(__cxxabiv1::__forced_unwind&)
698  {
699  this->_M_setstate(ios_base::badbit);
700  __throw_exception_again;
701  }
702  __catch(...)
703  { this->_M_setstate(ios_base::badbit); }
704  if (__err)
705  this->setstate(__err);
706  }
707  return _M_gcount;
708  }
709 
710  template<typename _CharT, typename _Traits>
711  basic_istream<_CharT, _Traits>&
712  basic_istream<_CharT, _Traits>::
713  putback(char_type __c)
714  {
715  // _GLIBCXX_RESOLVE_LIB_DEFECTS
716  // 60. What is a formatted input function?
717  _M_gcount = 0;
718  // Clear eofbit per N3168.
719  this->clear(this->rdstate() & ~ios_base::eofbit);
720  sentry __cerb(*this, true);
721  if (__cerb)
722  {
723  ios_base::iostate __err = ios_base::goodbit;
724  __try
725  {
726  const int_type __eof = traits_type::eof();
727  __streambuf_type* __sb = this->rdbuf();
728  if (!__sb
729  || traits_type::eq_int_type(__sb->sputbackc(__c), __eof))
730  __err |= ios_base::badbit;
731  }
732  __catch(__cxxabiv1::__forced_unwind&)
733  {
734  this->_M_setstate(ios_base::badbit);
735  __throw_exception_again;
736  }
737  __catch(...)
738  { this->_M_setstate(ios_base::badbit); }
739  if (__err)
740  this->setstate(__err);
741  }
742  return *this;
743  }
744 
745  template<typename _CharT, typename _Traits>
746  basic_istream<_CharT, _Traits>&
747  basic_istream<_CharT, _Traits>::
748  unget(void)
749  {
750  // _GLIBCXX_RESOLVE_LIB_DEFECTS
751  // 60. What is a formatted input function?
752  _M_gcount = 0;
753  // Clear eofbit per N3168.
754  this->clear(this->rdstate() & ~ios_base::eofbit);
755  sentry __cerb(*this, true);
756  if (__cerb)
757  {
758  ios_base::iostate __err = ios_base::goodbit;
759  __try
760  {
761  const int_type __eof = traits_type::eof();
762  __streambuf_type* __sb = this->rdbuf();
763  if (!__sb
764  || traits_type::eq_int_type(__sb->sungetc(), __eof))
765  __err |= ios_base::badbit;
766  }
767  __catch(__cxxabiv1::__forced_unwind&)
768  {
769  this->_M_setstate(ios_base::badbit);
770  __throw_exception_again;
771  }
772  __catch(...)
773  { this->_M_setstate(ios_base::badbit); }
774  if (__err)
775  this->setstate(__err);
776  }
777  return *this;
778  }
779 
780  template<typename _CharT, typename _Traits>
781  int
782  basic_istream<_CharT, _Traits>::
783  sync(void)
784  {
785  // _GLIBCXX_RESOLVE_LIB_DEFECTS
786  // DR60. Do not change _M_gcount.
787  int __ret = -1;
788  sentry __cerb(*this, true);
789  if (__cerb)
790  {
791  ios_base::iostate __err = ios_base::goodbit;
792  __try
793  {
794  __streambuf_type* __sb = this->rdbuf();
795  if (__sb)
796  {
797  if (__sb->pubsync() == -1)
798  __err |= ios_base::badbit;
799  else
800  __ret = 0;
801  }
802  }
803  __catch(__cxxabiv1::__forced_unwind&)
804  {
805  this->_M_setstate(ios_base::badbit);
806  __throw_exception_again;
807  }
808  __catch(...)
809  { this->_M_setstate(ios_base::badbit); }
810  if (__err)
811  this->setstate(__err);
812  }
813  return __ret;
814  }
815 
816  template<typename _CharT, typename _Traits>
817  typename basic_istream<_CharT, _Traits>::pos_type
818  basic_istream<_CharT, _Traits>::
819  tellg(void)
820  {
821  // _GLIBCXX_RESOLVE_LIB_DEFECTS
822  // DR60. Do not change _M_gcount.
823  pos_type __ret = pos_type(-1);
824  sentry __cerb(*this, true);
825  if (__cerb)
826  {
827  __try
828  {
829  if (!this->fail())
830  __ret = this->rdbuf()->pubseekoff(0, ios_base::cur,
831  ios_base::in);
832  }
833  __catch(__cxxabiv1::__forced_unwind&)
834  {
835  this->_M_setstate(ios_base::badbit);
836  __throw_exception_again;
837  }
838  __catch(...)
839  { this->_M_setstate(ios_base::badbit); }
840  }
841  return __ret;
842  }
843 
844  template<typename _CharT, typename _Traits>
845  basic_istream<_CharT, _Traits>&
846  basic_istream<_CharT, _Traits>::
847  seekg(pos_type __pos)
848  {
849  // _GLIBCXX_RESOLVE_LIB_DEFECTS
850  // DR60. Do not change _M_gcount.
851  // Clear eofbit per N3168.
852  this->clear(this->rdstate() & ~ios_base::eofbit);
853  sentry __cerb(*this, true);
854  if (__cerb)
855  {
856  ios_base::iostate __err = ios_base::goodbit;
857  __try
858  {
859  if (!this->fail())
860  {
861  // 136. seekp, seekg setting wrong streams?
862  const pos_type __p = this->rdbuf()->pubseekpos(__pos,
863  ios_base::in);
864 
865  // 129. Need error indication from seekp() and seekg()
866  if (__p == pos_type(off_type(-1)))
867  __err |= ios_base::failbit;
868  }
869  }
870  __catch(__cxxabiv1::__forced_unwind&)
871  {
872  this->_M_setstate(ios_base::badbit);
873  __throw_exception_again;
874  }
875  __catch(...)
876  { this->_M_setstate(ios_base::badbit); }
877  if (__err)
878  this->setstate(__err);
879  }
880  return *this;
881  }
882 
883  template<typename _CharT, typename _Traits>
884  basic_istream<_CharT, _Traits>&
885  basic_istream<_CharT, _Traits>::
886  seekg(off_type __off, ios_base::seekdir __dir)
887  {
888  // _GLIBCXX_RESOLVE_LIB_DEFECTS
889  // DR60. Do not change _M_gcount.
890  // Clear eofbit per N3168.
891  this->clear(this->rdstate() & ~ios_base::eofbit);
892  sentry __cerb(*this, true);
893  if (__cerb)
894  {
895  ios_base::iostate __err = 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(__cxxabiv1::__forced_unwind&)
910  {
911  this->_M_setstate(ios_base::badbit);
912  __throw_exception_again;
913  }
914  __catch(...)
915  { this->_M_setstate(ios_base::badbit); }
916  if (__err)
917  this->setstate(__err);
918  }
919  return *this;
920  }
921 
922  // 27.6.1.2.3 Character extraction templates
923  template<typename _CharT, typename _Traits>
924  basic_istream<_CharT, _Traits>&
925  operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
926  {
927  typedef basic_istream<_CharT, _Traits> __istream_type;
928  typedef typename __istream_type::int_type __int_type;
929 
930  typename __istream_type::sentry __cerb(__in, false);
931  if (__cerb)
932  {
933  ios_base::iostate __err = ios_base::goodbit;
934  __try
935  {
936  const __int_type __cb = __in.rdbuf()->sbumpc();
937  if (!_Traits::eq_int_type(__cb, _Traits::eof()))
938  __c = _Traits::to_char_type(__cb);
939  else
940  __err |= (ios_base::eofbit | ios_base::failbit);
941  }
942  __catch(__cxxabiv1::__forced_unwind&)
943  {
944  __in._M_setstate(ios_base::badbit);
945  __throw_exception_again;
946  }
947  __catch(...)
948  { __in._M_setstate(ios_base::badbit); }
949  if (__err)
950  __in.setstate(__err);
951  }
952  return __in;
953  }
954 
955  template<typename _CharT, typename _Traits>
956  basic_istream<_CharT, _Traits>&
957  operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
958  {
959  typedef basic_istream<_CharT, _Traits> __istream_type;
960  typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
961  typedef typename _Traits::int_type int_type;
962  typedef _CharT char_type;
963  typedef ctype<_CharT> __ctype_type;
964 
965  streamsize __extracted = 0;
966  ios_base::iostate __err = ios_base::goodbit;
967  typename __istream_type::sentry __cerb(__in, false);
968  if (__cerb)
969  {
970  __try
971  {
972  // Figure out how many characters to extract.
973  streamsize __num = __in.width();
974  if (__num <= 0)
975  __num = __gnu_cxx::__numeric_traits<streamsize>::__max;
976 
977  const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
978 
979  const int_type __eof = _Traits::eof();
980  __streambuf_type* __sb = __in.rdbuf();
981  int_type __c = __sb->sgetc();
982 
983  while (__extracted < __num - 1
984  && !_Traits::eq_int_type(__c, __eof)
985  && !__ct.is(ctype_base::space,
986  _Traits::to_char_type(__c)))
987  {
988  *__s++ = _Traits::to_char_type(__c);
989  ++__extracted;
990  __c = __sb->snextc();
991  }
992  if (_Traits::eq_int_type(__c, __eof))
993  __err |= ios_base::eofbit;
994 
995  // _GLIBCXX_RESOLVE_LIB_DEFECTS
996  // 68. Extractors for char* should store null at end
997  *__s = char_type();
998  __in.width(0);
999  }
1000  __catch(__cxxabiv1::__forced_unwind&)
1001  {
1002  __in._M_setstate(ios_base::badbit);
1003  __throw_exception_again;
1004  }
1005  __catch(...)
1006  { __in._M_setstate(ios_base::badbit); }
1007  }
1008  if (!__extracted)
1009  __err |= ios_base::failbit;
1010  if (__err)
1011  __in.setstate(__err);
1012  return __in;
1013  }
1014 
1015  // 27.6.1.4 Standard basic_istream manipulators
1016  template<typename _CharT, typename _Traits>
1017  basic_istream<_CharT, _Traits>&
1018  ws(basic_istream<_CharT, _Traits>& __in)
1019  {
1020  typedef basic_istream<_CharT, _Traits> __istream_type;
1021  typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
1022  typedef typename __istream_type::int_type __int_type;
1023  typedef ctype<_CharT> __ctype_type;
1024 
1025  const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
1026  const __int_type __eof = _Traits::eof();
1027  __streambuf_type* __sb = __in.rdbuf();
1028  __int_type __c = __sb->sgetc();
1029 
1030  while (!_Traits::eq_int_type(__c, __eof)
1031  && __ct.is(ctype_base::space, _Traits::to_char_type(__c)))
1032  __c = __sb->snextc();
1033 
1034  if (_Traits::eq_int_type(__c, __eof))
1035  __in.setstate(ios_base::eofbit);
1036  return __in;
1037  }
1038 
1039  // Inhibit implicit instantiations for required instantiations,
1040  // which are defined via explicit instantiations elsewhere.
1041 #if _GLIBCXX_EXTERN_TEMPLATE
1042  extern template class basic_istream<char>;
1043  extern template istream& ws(istream&);
1044  extern template istream& operator>>(istream&, char&);
1045  extern template istream& operator>>(istream&, char*);
1046  extern template istream& operator>>(istream&, unsigned char&);
1047  extern template istream& operator>>(istream&, signed char&);
1048  extern template istream& operator>>(istream&, unsigned char*);
1049  extern template istream& operator>>(istream&, signed char*);
1050 
1051  extern template istream& istream::_M_extract(unsigned short&);
1052  extern template istream& istream::_M_extract(unsigned int&);
1053  extern template istream& istream::_M_extract(long&);
1054  extern template istream& istream::_M_extract(unsigned long&);
1055  extern template istream& istream::_M_extract(bool&);
1056 #ifdef _GLIBCXX_USE_LONG_LONG
1057  extern template istream& istream::_M_extract(long long&);
1058  extern template istream& istream::_M_extract(unsigned long long&);
1059 #endif
1060  extern template istream& istream::_M_extract(float&);
1061  extern template istream& istream::_M_extract(double&);
1062  extern template istream& istream::_M_extract(long double&);
1063  extern template istream& istream::_M_extract(void*&);
1064 
1065  extern template class basic_iostream<char>;
1066 
1067 #ifdef _GLIBCXX_USE_WCHAR_T
1068  extern template class basic_istream<wchar_t>;
1069  extern template wistream& ws(wistream&);
1070  extern template wistream& operator>>(wistream&, wchar_t&);
1071  extern template wistream& operator>>(wistream&, wchar_t*);
1072 
1073  extern template wistream& wistream::_M_extract(unsigned short&);
1074  extern template wistream& wistream::_M_extract(unsigned int&);
1075  extern template wistream& wistream::_M_extract(long&);
1076  extern template wistream& wistream::_M_extract(unsigned long&);
1077  extern template wistream& wistream::_M_extract(bool&);
1078 #ifdef _GLIBCXX_USE_LONG_LONG
1079  extern template wistream& wistream::_M_extract(long long&);
1080  extern template wistream& wistream::_M_extract(unsigned long long&);
1081 #endif
1082  extern template wistream& wistream::_M_extract(float&);
1083  extern template wistream& wistream::_M_extract(double&);
1084  extern template wistream& wistream::_M_extract(long double&);
1085  extern template wistream& wistream::_M_extract(void*&);
1086 
1087  extern template class basic_iostream<wchar_t>;
1088 #endif
1089 #endif
1090 
1091 _GLIBCXX_END_NAMESPACE_VERSION
1092 } // namespace std
1093 
1094 #endif
std::basic_ios::fail
bool fail() const
Fast error checking.
Definition: basic_ios.h:193
std::basic_streambuf::pubsync
int pubsync()
Entry points for derived buffer functions.
Definition: streambuf:250
std::ios_base::eofbit
static const iostate eofbit
Indicates that an input operation reached the end of an input sequence.
Definition: ios_base.h:339
std::ios_base::width
streamsize width() const
Flags access.
Definition: ios_base.h:646
std::basic_streambuf::sgetc
int_type sgetc()
Getting the next character.
Definition: streambuf:317
std::basic_istream::_M_gcount
streamsize _M_gcount
Definition: istream:81
std::basic_ios::good
bool good() const
Fast error checking.
Definition: basic_ios.h:172
std::basic_streambuf::sputc
int_type sputc(char_type __c)
Entry point for all single-character output functions.
Definition: streambuf:403
std::streamsize
ptrdiff_t streamsize
Integral type for I/O operation counts and buffer sizes.
Definition: postypes.h:100
std::basic_istream::sync
int sync()
Synchronizing the stream buffer.
Definition: istream.tcc:783
std::basic_streambuf::sungetc
int_type sungetc()
Moving backwards in the input stream.
Definition: streambuf:376
std::basic_istream::getline
__istream_type & getline(char_type *__s, streamsize __n, char_type __delim)
String extraction.
Definition: istream.tcc:402
std::ctype
Primary class template ctype facet.This template class defines classification and conversion function...
Definition: locale_facets.h:606
std::basic_istream::get
int_type get()
Simple extraction.
Definition: istream.tcc:238
std::basic_ios::clear
void clear(iostate __state=goodbit)
[Re]sets the error state.
Definition: basic_ios.tcc:42
std::ios_base::goodbit
static const iostate goodbit
Indicates all is well.
Definition: ios_base.h:347
std::basic_istream
Controlling input.This is the base class for all input streams. It provides text formatting of all bu...
Definition: iosfwd:85
std::basic_istream::ignore
__istream_type & ignore()
Discarding characters.
Definition: istream.tcc:462
std::basic_ios::rdbuf
basic_streambuf< _CharT, _Traits > * rdbuf() const
Accessing the underlying buffer.
Definition: basic_ios.h:313
std::basic_istream::unget
__istream_type & unget()
Unextracting the previous character.
Definition: istream.tcc:748
std::basic_istream::tellg
pos_type tellg()
Getting the current read position.
Definition: istream.tcc:819
std::wistream
basic_istream< wchar_t > wistream
Base class for wchar_t input streams.
Definition: iosfwd:175
std::ws
basic_istream< _CharT, _Traits > & ws(basic_istream< _CharT, _Traits > &__is)
Quick and easy way to eat whitespace.
Definition: istream.tcc:1018
std::basic_streambuf::sputbackc
int_type sputbackc(char_type __c)
Pushing characters back into the input stream.
Definition: streambuf:351
std::ios_base::in
static const openmode in
Open for input. Default for ifstream and fstream.
Definition: ios_base.h:377
std::num_get
Primary class template num_get.This facet encapsulates the code to parse and return a number from a s...
Definition: locale_facets.h:1916
std::ios_base::cur
static const seekdir cur
Request a seek relative to the current position within the sequence.
Definition: ios_base.h:401
std::num_get::get
iter_type get(iter_type __in, iter_type __end, ios_base &__io, ios_base::iostate &__err, bool &__v) const
Numeric parsing.
Definition: locale_facets.h:1963
std::ios_base::getloc
locale getloc() const
Locale access.
Definition: ios_base.h:697
std::basic_ios::rdstate
iostate rdstate() const
Returns the error state of the stream buffer.
Definition: basic_ios.h:129
std::ios_base::skipws
static const fmtflags skipws
Skips leading white space before certain input operations.
Definition: ios_base.h:302
std::ios_base::badbit
static const iostate badbit
Indicates a loss of integrity in an input or output sequence (such as an irrecoverable read error fro...
Definition: ios_base.h:336
std::basic_istream::readsome
streamsize readsome(char_type *__s, streamsize __n)
Extraction until the buffer is exhausted, but no more.
Definition: istream.tcc:681
std::basic_istream::peek
int_type peek()
Looking ahead in the stream.
Definition: istream.tcc:622
std::basic_istream::sentry::sentry
sentry(basic_istream< _CharT, _Traits > &__is, bool __noskipws=false)
The constructor performs all the work.
Definition: istream.tcc:49
std::ios_base::flags
fmtflags flags() const
Access to format flags.
Definition: ios_base.h:553
std::basic_streambuf
The actual work of input and output (interface).This is a base class. Derived stream buffers each con...
Definition: iosfwd:82
std::__ctype_abstract_base::is
bool is(mask __m, char_type __c) const
Test char_type classification.
Definition: locale_facets.h:163
std::basic_ios::setstate
void setstate(iostate __state)
Sets additional flags in the error state.
Definition: basic_ios.h:149
std::min
const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
Definition: stl_algobase.h:187
std::basic_streambuf::sbumpc
int_type sbumpc()
Getting the next character.
Definition: streambuf:295
std::basic_istream::putback
__istream_type & putback(char_type __c)
Unextracting a single character.
Definition: istream.tcc:713
std::istream
basic_istream< char > istream
Base class for char input streams.
Definition: iosfwd:135
__cxxabiv1::__forced_unwind
Thrown as part of forced unwinding.A magic placeholder class that can be caught by reference to recog...
Definition: cxxabi_forced.h:48
std::basic_istream::sentry
Performs setup work for input streams.
Definition: istream:638
std::ios_base::failbit
static const iostate failbit
Indicates that an input operation failed to read the expected characters, or that an output operation...
Definition: ios_base.h:344
std::basic_streambuf::snextc
int_type snextc()
Getting the next character.
Definition: streambuf:277
std::basic_istream::operator>>
__istream_type & operator>>(__istream_type &(*__pf)(__istream_type &))
Interface for manipulators.
Definition: istream:122
std::basic_istream::seekg
__istream_type & seekg(pos_type)
Changing the current read position.
Definition: istream.tcc:847
std::basic_ios::tie
basic_ostream< _CharT, _Traits > * tie() const
Fetches the current tied stream.
Definition: basic_ios.h:287
std::basic_istream::read
__istream_type & read(char_type *__s, streamsize __n)
Extraction without delimiters.
Definition: istream.tcc:652