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Current view: directory - tools/gcc-4.5/include/c++/4.5.2/bits - streambuf_iterator.h (source / functions) Found Hit Coverage
Test: app.info Lines: 8 0 0.0 %
Date: 2012-06-02 Functions: 4 0 0.0 %

       1                 : // Streambuf iterators
       2                 : 
       3                 : // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
       4                 : // 2006, 2007, 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 streambuf_iterator.h
      28                 :  *  This is an internal header file, included by other library headers.
      29                 :  *  You should not attempt to use it directly.
      30                 :  */
      31                 : 
      32                 : #ifndef _STREAMBUF_ITERATOR_H
      33                 : #define _STREAMBUF_ITERATOR_H 1
      34                 : 
      35                 : #pragma GCC system_header
      36                 : 
      37                 : #include <streambuf>
      38                 : #include <debug/debug.h>
      39                 : 
      40                 : _GLIBCXX_BEGIN_NAMESPACE(std)
      41                 :      
      42                 :   /**
      43                 :    * @addtogroup iterators
      44                 :    * @{
      45                 :    */
      46                 : 
      47                 :   // 24.5.3 Template class istreambuf_iterator
      48                 :   /// Provides input iterator semantics for streambufs.
      49                 :   template<typename _CharT, typename _Traits>
      50                 :     class istreambuf_iterator
      51                 :     : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
      52                 :                       _CharT*, _CharT&>
      53                 :     {
      54                 :     public:
      55                 :       // Types:
      56                 :       //@{
      57                 :       /// Public typedefs
      58                 :       typedef _CharT                                    char_type;
      59                 :       typedef _Traits                                   traits_type;
      60                 :       typedef typename _Traits::int_type                int_type;
      61                 :       typedef basic_streambuf<_CharT, _Traits>            streambuf_type;
      62                 :       typedef basic_istream<_CharT, _Traits>              istream_type;
      63                 :       //@}
      64                 : 
      65                 :       template<typename _CharT2>
      66                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
      67                 :                                     ostreambuf_iterator<_CharT2> >::__type
      68                 :         copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
      69                 :              ostreambuf_iterator<_CharT2>);
      70                 : 
      71                 :       template<bool _IsMove, typename _CharT2>
      72                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value, 
      73                 :                                                _CharT2*>::__type
      74                 :         __copy_move_a2(istreambuf_iterator<_CharT2>,
      75                 :                        istreambuf_iterator<_CharT2>, _CharT2*);
      76                 : 
      77                 :       template<typename _CharT2>
      78                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
      79                 :                                     istreambuf_iterator<_CharT2> >::__type
      80                 :         find(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
      81                 :              const _CharT2&);
      82                 : 
      83                 :     private:
      84                 :       // 24.5.3 istreambuf_iterator
      85                 :       // p 1
      86                 :       // If the end of stream is reached (streambuf_type::sgetc()
      87                 :       // returns traits_type::eof()), the iterator becomes equal to
      88                 :       // the "end of stream" iterator value.
      89                 :       // NB: This implementation assumes the "end of stream" value
      90                 :       // is EOF, or -1.
      91                 :       mutable streambuf_type*   _M_sbuf;
      92                 :       mutable int_type          _M_c;
      93                 : 
      94                 :     public:
      95                 :       ///  Construct end of input stream iterator.
      96                 :       istreambuf_iterator() throw()
      97                 :       : _M_sbuf(0), _M_c(traits_type::eof()) { }
      98                 : 
      99                 :       ///  Construct start of input stream iterator.
     100               0 :       istreambuf_iterator(istream_type& __s) throw()
     101               0 :       : _M_sbuf(__s.rdbuf()), _M_c(traits_type::eof()) { }
     102                 : 
     103                 :       ///  Construct start of streambuf iterator.
     104               0 :       istreambuf_iterator(streambuf_type* __s) throw()
     105               0 :       : _M_sbuf(__s), _M_c(traits_type::eof()) { }
     106                 : 
     107                 :       ///  Return the current character pointed to by iterator.  This returns
     108                 :       ///  streambuf.sgetc().  It cannot be assigned.  NB: The result of
     109                 :       ///  operator*() on an end of stream is undefined.
     110                 :       char_type
     111                 :       operator*() const
     112                 :       {
     113                 : #ifdef _GLIBCXX_DEBUG_PEDANTIC
     114                 :         // Dereferencing a past-the-end istreambuf_iterator is a
     115                 :         // libstdc++ extension
     116                 :         __glibcxx_requires_cond(!_M_at_eof(),
     117                 :                                 _M_message(__gnu_debug::__msg_deref_istreambuf)
     118                 :                                 ._M_iterator(*this));
     119                 : #endif
     120                 :         return traits_type::to_char_type(_M_get());
     121                 :       }
     122                 : 
     123                 :       /// Advance the iterator.  Calls streambuf.sbumpc().
     124                 :       istreambuf_iterator&
     125                 :       operator++()
     126                 :       {
     127                 :         __glibcxx_requires_cond(!_M_at_eof(),
     128                 :                                 _M_message(__gnu_debug::__msg_inc_istreambuf)
     129                 :                                 ._M_iterator(*this));
     130                 :         if (_M_sbuf)
     131                 :           {
     132                 :             _M_sbuf->sbumpc();
     133                 :             _M_c = traits_type::eof();
     134                 :           }
     135                 :         return *this;
     136                 :       }
     137                 : 
     138                 :       /// Advance the iterator.  Calls streambuf.sbumpc().
     139                 :       istreambuf_iterator
     140                 :       operator++(int)
     141                 :       {
     142                 :         __glibcxx_requires_cond(!_M_at_eof(),
     143                 :                                 _M_message(__gnu_debug::__msg_inc_istreambuf)
     144                 :                                 ._M_iterator(*this));
     145                 : 
     146                 :         istreambuf_iterator __old = *this;
     147                 :         if (_M_sbuf)
     148                 :           {
     149                 :             __old._M_c = _M_sbuf->sbumpc();
     150                 :             _M_c = traits_type::eof();
     151                 :           }
     152                 :         return __old;
     153                 :       }
     154                 : 
     155                 :       // _GLIBCXX_RESOLVE_LIB_DEFECTS
     156                 :       // 110 istreambuf_iterator::equal not const
     157                 :       // NB: there is also number 111 (NAD, Future) pending on this function.
     158                 :       /// Return true both iterators are end or both are not end.
     159                 :       bool
     160                 :       equal(const istreambuf_iterator& __b) const
     161                 :       { return _M_at_eof() == __b._M_at_eof(); }
     162                 : 
     163                 :     private:
     164                 :       int_type
     165                 :       _M_get() const
     166                 :       {
     167                 :         const int_type __eof = traits_type::eof();
     168                 :         int_type __ret = __eof;
     169                 :         if (_M_sbuf)
     170                 :           {
     171                 :             if (!traits_type::eq_int_type(_M_c, __eof))
     172                 :               __ret = _M_c;
     173                 :             else if (!traits_type::eq_int_type((__ret = _M_sbuf->sgetc()),
     174                 :                                                __eof))
     175                 :               _M_c = __ret;
     176                 :             else
     177                 :               _M_sbuf = 0;
     178                 :           }
     179                 :         return __ret;
     180                 :       }
     181                 : 
     182                 :       bool
     183                 :       _M_at_eof() const
     184                 :       {
     185                 :         const int_type __eof = traits_type::eof();
     186                 :         return traits_type::eq_int_type(_M_get(), __eof);
     187                 :       }
     188                 :     };
     189                 : 
     190                 :   template<typename _CharT, typename _Traits>
     191                 :     inline bool
     192                 :     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
     193                 :                const istreambuf_iterator<_CharT, _Traits>& __b)
     194                 :     { return __a.equal(__b); }
     195                 : 
     196                 :   template<typename _CharT, typename _Traits>
     197                 :     inline bool
     198                 :     operator!=(const istreambuf_iterator<_CharT, _Traits>& __a,
     199                 :                const istreambuf_iterator<_CharT, _Traits>& __b)
     200                 :     { return !__a.equal(__b); }
     201                 : 
     202                 :   /// Provides output iterator semantics for streambufs.
     203                 :   template<typename _CharT, typename _Traits>
     204                 :     class ostreambuf_iterator
     205                 :     : public iterator<output_iterator_tag, void, void, void, void>
     206                 :     {
     207                 :     public:
     208                 :       // Types:
     209                 :       //@{
     210                 :       /// Public typedefs
     211                 :       typedef _CharT                           char_type;
     212                 :       typedef _Traits                          traits_type;
     213                 :       typedef basic_streambuf<_CharT, _Traits> streambuf_type;
     214                 :       typedef basic_ostream<_CharT, _Traits>   ostream_type;
     215                 :       //@}
     216                 : 
     217                 :       template<typename _CharT2>
     218                 :         friend typename __gnu_cxx::__enable_if<__is_char<_CharT2>::__value,
     219                 :                                     ostreambuf_iterator<_CharT2> >::__type
     220                 :         copy(istreambuf_iterator<_CharT2>, istreambuf_iterator<_CharT2>,
     221                 :              ostreambuf_iterator<_CharT2>);
     222                 : 
     223                 :     private:
     224                 :       streambuf_type*   _M_sbuf;
     225                 :       bool              _M_failed;
     226                 : 
     227                 :     public:
     228                 :       ///  Construct output iterator from ostream.
     229               0 :       ostreambuf_iterator(ostream_type& __s) throw ()
     230               0 :       : _M_sbuf(__s.rdbuf()), _M_failed(!_M_sbuf) { }
     231                 : 
     232                 :       ///  Construct output iterator from streambuf.
     233                 :       ostreambuf_iterator(streambuf_type* __s) throw ()
     234                 :       : _M_sbuf(__s), _M_failed(!_M_sbuf) { }
     235                 : 
     236                 :       ///  Write character to streambuf.  Calls streambuf.sputc().
     237                 :       ostreambuf_iterator&
     238                 :       operator=(_CharT __c)
     239                 :       {
     240                 :         if (!_M_failed &&
     241                 :             _Traits::eq_int_type(_M_sbuf->sputc(__c), _Traits::eof()))
     242                 :           _M_failed = true;
     243                 :         return *this;
     244                 :       }
     245                 : 
     246                 :       /// Return *this.
     247                 :       ostreambuf_iterator&
     248                 :       operator*()
     249                 :       { return *this; }
     250                 : 
     251                 :       /// Return *this.
     252                 :       ostreambuf_iterator&
     253                 :       operator++(int)
     254                 :       { return *this; }
     255                 : 
     256                 :       /// Return *this.
     257                 :       ostreambuf_iterator&
     258                 :       operator++()
     259                 :       { return *this; }
     260                 : 
     261                 :       /// Return true if previous operator=() failed.
     262                 :       bool
     263               0 :       failed() const throw()
     264               0 :       { return _M_failed; }
     265                 : 
     266                 :       ostreambuf_iterator&
     267                 :       _M_put(const _CharT* __ws, streamsize __len)
     268                 :       {
     269                 :         if (__builtin_expect(!_M_failed, true)
     270                 :             && __builtin_expect(this->_M_sbuf->sputn(__ws, __len) != __len,
     271                 :                                 false))
     272                 :           _M_failed = true;
     273                 :         return *this;
     274                 :       }
     275                 :     };
     276                 : 
     277                 :   // Overloads for streambuf iterators.
     278                 :   template<typename _CharT>
     279                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
     280                 :                                     ostreambuf_iterator<_CharT> >::__type
     281                 :     copy(istreambuf_iterator<_CharT> __first,
     282                 :          istreambuf_iterator<_CharT> __last,
     283                 :          ostreambuf_iterator<_CharT> __result)
     284                 :     {
     285                 :       if (__first._M_sbuf && !__last._M_sbuf && !__result._M_failed)
     286                 :         {
     287                 :           bool __ineof;
     288                 :           __copy_streambufs_eof(__first._M_sbuf, __result._M_sbuf, __ineof);
     289                 :           if (!__ineof)
     290                 :             __result._M_failed = true;
     291                 :         }
     292                 :       return __result;
     293                 :     }
     294                 : 
     295                 :   template<bool _IsMove, typename _CharT>
     296                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 
     297                 :                                     ostreambuf_iterator<_CharT> >::__type
     298                 :     __copy_move_a2(_CharT* __first, _CharT* __last,
     299                 :                    ostreambuf_iterator<_CharT> __result)
     300                 :     {
     301                 :       const streamsize __num = __last - __first;
     302                 :       if (__num > 0)
     303                 :         __result._M_put(__first, __num);
     304                 :       return __result;
     305                 :     }
     306                 : 
     307                 :   template<bool _IsMove, typename _CharT>
     308                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
     309                 :                                     ostreambuf_iterator<_CharT> >::__type
     310                 :     __copy_move_a2(const _CharT* __first, const _CharT* __last,
     311                 :                    ostreambuf_iterator<_CharT> __result)
     312                 :     {
     313                 :       const streamsize __num = __last - __first;
     314                 :       if (__num > 0)
     315                 :         __result._M_put(__first, __num);
     316                 :       return __result;
     317                 :     }
     318                 : 
     319                 :   template<bool _IsMove, typename _CharT>
     320                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, 
     321                 :                                     _CharT*>::__type
     322                 :     __copy_move_a2(istreambuf_iterator<_CharT> __first,
     323                 :                    istreambuf_iterator<_CharT> __last, _CharT* __result)
     324                 :     {
     325                 :       typedef istreambuf_iterator<_CharT>                  __is_iterator_type;
     326                 :       typedef typename __is_iterator_type::traits_type     traits_type;
     327                 :       typedef typename __is_iterator_type::streambuf_type  streambuf_type;
     328                 :       typedef typename traits_type::int_type               int_type;
     329                 : 
     330                 :       if (__first._M_sbuf && !__last._M_sbuf)
     331                 :         {
     332                 :           streambuf_type* __sb = __first._M_sbuf;
     333                 :           int_type __c = __sb->sgetc();
     334                 :           while (!traits_type::eq_int_type(__c, traits_type::eof()))
     335                 :             {
     336                 :               const streamsize __n = __sb->egptr() - __sb->gptr();
     337                 :               if (__n > 1)
     338                 :                 {
     339                 :                   traits_type::copy(__result, __sb->gptr(), __n);
     340                 :                   __sb->gbump(__n);
     341                 :                   __result += __n;
     342                 :                   __c = __sb->underflow();
     343                 :                 }
     344                 :               else
     345                 :                 {
     346                 :                   *__result++ = traits_type::to_char_type(__c);
     347                 :                   __c = __sb->snextc();
     348                 :                 }
     349                 :             }
     350                 :         }
     351                 :       return __result;
     352                 :     }
     353                 : 
     354                 :   template<typename _CharT>
     355                 :     typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value,
     356                 :                                     istreambuf_iterator<_CharT> >::__type
     357                 :     find(istreambuf_iterator<_CharT> __first,
     358                 :          istreambuf_iterator<_CharT> __last, const _CharT& __val)
     359                 :     {
     360                 :       typedef istreambuf_iterator<_CharT>                  __is_iterator_type;
     361                 :       typedef typename __is_iterator_type::traits_type     traits_type;
     362                 :       typedef typename __is_iterator_type::streambuf_type  streambuf_type;
     363                 :       typedef typename traits_type::int_type               int_type;
     364                 : 
     365                 :       if (__first._M_sbuf && !__last._M_sbuf)
     366                 :         {
     367                 :           const int_type __ival = traits_type::to_int_type(__val);
     368                 :           streambuf_type* __sb = __first._M_sbuf;
     369                 :           int_type __c = __sb->sgetc();
     370                 :           while (!traits_type::eq_int_type(__c, traits_type::eof())
     371                 :                  && !traits_type::eq_int_type(__c, __ival))
     372                 :             {
     373                 :               streamsize __n = __sb->egptr() - __sb->gptr();
     374                 :               if (__n > 1)
     375                 :                 {
     376                 :                   const _CharT* __p = traits_type::find(__sb->gptr(),
     377                 :                                                         __n, __val);
     378                 :                   if (__p)
     379                 :                     __n = __p - __sb->gptr();
     380                 :                   __sb->gbump(__n);
     381                 :                   __c = __sb->sgetc();
     382                 :                 }
     383                 :               else
     384                 :                 __c = __sb->snextc();
     385                 :             }
     386                 : 
     387                 :           if (!traits_type::eq_int_type(__c, traits_type::eof()))
     388                 :             __first._M_c = __c;
     389                 :           else
     390                 :             __first._M_sbuf = 0;
     391                 :         }
     392                 :       return __first;
     393                 :     }
     394                 : 
     395                 : // @} group iterators
     396                 : 
     397                 : _GLIBCXX_END_NAMESPACE
     398                 : 
     399                 : #endif

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