1 // Stream buffer classes -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
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 const typename basic_streambuf<_CharT, _Traits>::int_type
44 basic_streambuf<_CharT, _Traits>::_S_pback_size;
46 template<typename _CharT, typename _Traits>
47 typename basic_streambuf<_CharT, _Traits>::int_type
48 basic_streambuf<_CharT, _Traits>::
52 if (_M_in_cur && _M_in_cur < _M_in_end)
54 char_type __c = *(this->gptr());
56 __ret = traits_type::to_int_type(__c);
59 __ret = this->uflow();
63 template<typename _CharT, typename _Traits>
64 typename basic_streambuf<_CharT, _Traits>::int_type
65 basic_streambuf<_CharT, _Traits>::
66 sputbackc(char_type __c)
69 bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur;
70 bool __testne = _M_in_cur && !traits_type::eq(__c, this->gptr()[-1]);
71 if (!__testpos || __testne)
72 __ret = pbackfail(traits_type::to_int_type(__c));
76 __ret = traits_type::to_int_type(*this->gptr());
81 template<typename _CharT, typename _Traits>
82 typename basic_streambuf<_CharT, _Traits>::int_type
83 basic_streambuf<_CharT, _Traits>::
87 if (_M_in_cur && _M_in_beg < _M_in_cur)
90 __ret = traits_type::to_int_type(*_M_in_cur);
93 __ret = this->pbackfail();
97 // Don't test against _M_buf + _M_buf_size, because _M_buf reflects
98 // allocated space, and on certain (rare but entirely legal)
99 // situations, there will be no allocated space yet the internal
100 // buffers will still be valid. (This happens if setp is used to set
101 // the internal buffer to say some externally-allocated sequence.)
102 template<typename _CharT, typename _Traits>
103 typename basic_streambuf<_CharT, _Traits>::int_type
104 basic_streambuf<_CharT, _Traits>::
108 if (_M_out_buf_size())
112 __ret = traits_type::to_int_type(__c);
115 __ret = this->overflow(traits_type::to_int_type(__c));
119 template<typename _CharT, typename _Traits>
121 basic_streambuf<_CharT, _Traits>::
122 xsgetn(char_type* __s, streamsize __n)
124 streamsize __ret = 0;
127 size_t __buf_len = _M_in_end - _M_in_cur;
130 size_t __remaining = __n - __ret;
131 size_t __len = min(__buf_len, __remaining);
132 traits_type::copy(__s, _M_in_cur, __len);
135 _M_in_cur_move(__len);
140 int_type __c = this->uflow();
141 if (__c != traits_type::eof())
143 traits_type::assign(*__s++, traits_type::to_char_type(__c));
153 // Don't test against _M_buf + _M_buf_size, because _M_buf reflects
154 // allocated space, and on certain (rare but entirely legal)
155 // situations, there will be no allocated space yet the internal
156 // buffers will still be valid. (This happens if setp is used to set
157 // the internal buffer to say some externally-allocated sequence.)
158 template<typename _CharT, typename _Traits>
160 basic_streambuf<_CharT, _Traits>::
161 xsputn(const char_type* __s, streamsize __n)
163 streamsize __ret = 0;
166 off_type __buf_len = _M_out_buf_size();
169 off_type __remaining = __n - __ret;
170 off_type __len = min(__buf_len, __remaining);
171 traits_type::copy(_M_out_cur, __s, __len);
174 _M_out_cur_move(__len);
179 int_type __c = this->overflow(traits_type::to_int_type(*__s));
180 if (__c != traits_type::eof())
192 // Conceivably, this could be used to implement buffer-to-buffer
193 // copies, if this was ever desired in an un-ambiguous way by the
194 // standard. If so, then checks for __ios being zero would be
196 template<typename _CharT, typename _Traits>
198 __copy_streambufs(basic_ios<_CharT, _Traits>& __ios,
199 basic_streambuf<_CharT, _Traits>* __sbin,
200 basic_streambuf<_CharT, _Traits>* __sbout)
202 typedef typename _Traits::int_type int_type;
204 streamsize __ret = 0;
205 streamsize __bufsize = __sbin->in_avail();
207 bool __testput = __sbout->_M_mode & ios_base::out;
210 while (__testput && __bufsize != -1)
212 __xtrct = __sbout->sputn(__sbin->gptr(), __bufsize);
214 __sbin->_M_in_cur_move(__xtrct);
215 if (__xtrct == __bufsize)
217 if (__sbin->sgetc() == _Traits::eof())
219 __bufsize = __sbin->in_avail();
225 catch(exception& __fail)
227 __ios.setstate(ios_base::failbit);
228 if ((__ios.exceptions() & ios_base::failbit) != 0)
229 __throw_exception_again;
234 // Inhibit implicit instantiations for required instantiations,
235 // which are defined via explicit instantiations elsewhere.
236 // NB: This syntax is a GNU extension.
237 extern template class basic_streambuf<char>;
240 __copy_streambufs(basic_ios<char>&, basic_streambuf<char>*,
241 basic_streambuf<char>*);
243 extern template class basic_streambuf<wchar_t>;
246 __copy_streambufs(basic_ios<wchar_t>&, basic_streambuf<wchar_t>*,
247 basic_streambuf<wchar_t>*);