libstdc++-v3/src/streambuf.cc

   1 // Stream buffer classes -*- C++ -*-
   2
   3 // Copyright (C) 2004, 2005 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 //
  31 // ISO C++ 14882: 27.5  Stream buffers
  32 //
  33
  34 #include <streambuf>
  35
  36 namespace std
  37 {
  38   template<>
  39     streamsize
  40     __copy_streambufs(basic_streambuf<char>* __sbin,
  41                       basic_streambuf<char>* __sbout)
  42     {
  43       typedef basic_streambuf<char>::traits_type traits_type;
  44       streamsize __ret = 0;
  45       traits_type::int_type __c = __sbin->sgetc();
  46       while (!traits_type::eq_int_type(__c, traits_type::eof()))
  47         {
  48           const streamsize __n = __sbin->egptr() - __sbin->gptr();
  49           if (__n > 1)
  50             {
  51               const streamsize __wrote = __sbout->sputn(__sbin->gptr(), __n);
  52               __sbin->gbump(__wrote);
  53               __ret += __wrote;
  54               if (__wrote < __n)
  55                 break;
  56               __c = __sbin->underflow();
  57             }
  58           else
  59             {
  60               __c = __sbout->sputc(traits_type::to_char_type(__c));
  61               if (traits_type::eq_int_type(__c, traits_type::eof()))
  62                 break;
  63               ++__ret;
  64               __c = __sbin->snextc();
  65             }
  66         }
  67       return __ret;
  68     }
  69
  70 #ifdef _GLIBCXX_USE_WCHAR_T
  71   template<>
  72     streamsize
  73     __copy_streambufs(basic_streambuf<wchar_t>* __sbin,
  74                       basic_streambuf<wchar_t>* __sbout)
  75     {
  76       typedef basic_streambuf<wchar_t>::traits_type traits_type;
  77       streamsize __ret = 0;
  78       traits_type::int_type __c = __sbin->sgetc();
  79       while (!traits_type::eq_int_type(__c, traits_type::eof()))
  80         {
  81           const streamsize __n = __sbin->egptr() - __sbin->gptr();
  82           if (__n > 1)
  83             {
  84               const streamsize __wrote = __sbout->sputn(__sbin->gptr(), __n);
  85               __sbin->gbump(__wrote);
  86               __ret += __wrote;
  87               if (__wrote < __n)
  88                 break;
  89               __c = __sbin->underflow();
  90             }
  91           else
  92             {
  93               __c = __sbout->sputc(traits_type::to_char_type(__c));
  94               if (traits_type::eq_int_type(__c, traits_type::eof()))
  95                 break;
  96               ++__ret;
  97               __c = __sbin->snextc();
  98             }
  99         }
 100       return __ret;
 101     }
 102 #endif
 103 } // namespace std