1 // Stream buffer classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
4 // Free Software Foundation, Inc.
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)
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.
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,
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.
32 // ISO C++ 14882: 27.5 Stream buffers
35 #ifndef _CPP_BITS_STREAMBUF_TCC
36 #define _CPP_BITS_STREAMBUF_TCC 1
38 #pragma GCC system_header
42 template<typename _CharT, typename _Traits>
43 typename basic_streambuf<_CharT, _Traits>::int_type
44 basic_streambuf<_CharT, _Traits>::
48 if (_M_in_cur < _M_in_end)
50 __ret = traits_type::to_int_type(*this->_M_in_cur);
54 __ret = this->uflow();
58 template<typename _CharT, typename _Traits>
59 typename basic_streambuf<_CharT, _Traits>::int_type
60 basic_streambuf<_CharT, _Traits>::
61 sputbackc(char_type __c)
64 const bool __testpos = _M_in_beg < _M_in_cur;
65 if (!__testpos || !traits_type::eq(__c, this->_M_in_cur[-1]))
66 __ret = this->pbackfail(traits_type::to_int_type(__c));
70 __ret = traits_type::to_int_type(*this->_M_in_cur);
75 template<typename _CharT, typename _Traits>
76 typename basic_streambuf<_CharT, _Traits>::int_type
77 basic_streambuf<_CharT, _Traits>::
81 if (_M_in_beg < _M_in_cur)
84 __ret = traits_type::to_int_type(*_M_in_cur);
87 __ret = this->pbackfail();
91 template<typename _CharT, typename _Traits>
92 typename basic_streambuf<_CharT, _Traits>::int_type
93 basic_streambuf<_CharT, _Traits>::
97 if (_M_out_cur < _M_out_end)
101 __ret = traits_type::to_int_type(__c);
104 __ret = this->overflow(traits_type::to_int_type(__c));
108 template<typename _CharT, typename _Traits>
110 basic_streambuf<_CharT, _Traits>::
111 xsgetn(char_type* __s, streamsize __n)
113 streamsize __ret = 0;
116 const size_t __buf_len = _M_in_end - _M_in_cur;
119 const size_t __remaining = __n - __ret;
120 const size_t __len = std::min(__buf_len, __remaining);
121 traits_type::copy(__s, _M_in_cur, __len);
124 _M_move_in_cur(__len);
129 const int_type __c = this->uflow();
130 if (!traits_type::eq_int_type(__c, traits_type::eof()))
132 traits_type::assign(*__s++, traits_type::to_char_type(__c));
142 template<typename _CharT, typename _Traits>
144 basic_streambuf<_CharT, _Traits>::
145 xsputn(const char_type* __s, streamsize __n)
147 streamsize __ret = 0;
150 const size_t __buf_len = _M_out_end - _M_out_cur;
153 const size_t __remaining = __n - __ret;
154 const size_t __len = std::min(__buf_len, __remaining);
155 traits_type::copy(_M_out_cur, __s, __len);
158 _M_move_out_cur(__len);
163 int_type __c = this->overflow(traits_type::to_int_type(*__s));
164 if (!traits_type::eq_int_type(__c, traits_type::eof()))
176 // Conceivably, this could be used to implement buffer-to-buffer
177 // copies, if this was ever desired in an un-ambiguous way by the
178 // standard. If so, then checks for __ios being zero would be
180 template<typename _CharT, typename _Traits>
182 __copy_streambufs(basic_ios<_CharT, _Traits>& __ios,
183 basic_streambuf<_CharT, _Traits>* __sbin,
184 basic_streambuf<_CharT, _Traits>* __sbout)
186 streamsize __ret = 0;
189 typename _Traits::int_type __c = __sbin->sgetc();
190 while (!_Traits::eq_int_type(__c, _Traits::eof()))
192 const size_t __n = __sbin->_M_in_end - __sbin->_M_in_cur;
195 const size_t __wrote = __sbout->sputn(__sbin->_M_in_cur,
197 __sbin->_M_move_in_cur(__wrote);
201 __c = __sbin->underflow();
205 __c = __sbout->sputc(_Traits::to_char_type(__c));
206 if (_Traits::eq_int_type(__c, _Traits::eof()))
209 __c = __sbin->snextc();
213 catch(exception& __fail)
215 __ios.setstate(ios_base::failbit);
216 if ((__ios.exceptions() & ios_base::failbit) != 0)
217 __throw_exception_again;
222 // Inhibit implicit instantiations for required instantiations,
223 // which are defined via explicit instantiations elsewhere.
224 // NB: This syntax is a GNU extension.
225 #if _GLIBCPP_EXTERN_TEMPLATE
226 extern template class basic_streambuf<char>;
229 __copy_streambufs(basic_ios<char>&, basic_streambuf<char>*,
230 basic_streambuf<char>*);
232 #ifdef _GLIBCPP_USE_WCHAR_T
233 extern template class basic_streambuf<wchar_t>;
236 __copy_streambufs(basic_ios<wchar_t>&, basic_streambuf<wchar_t>*,
237 basic_streambuf<wchar_t>*);