175 lines
4.8 KiB
C++
175 lines
4.8 KiB
C++
// Stream buffer classes -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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// 2006, 2009, 2010 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/streambuf.tcc
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{streambuf}
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*/
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//
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// ISO C++ 14882: 27.5 Stream buffers
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//
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#ifndef _STREAMBUF_TCC
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#define _STREAMBUF_TCC 1
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#pragma GCC system_header
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_GLIBCXX_BEGIN_NAMESPACE(std)
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template<typename _CharT, typename _Traits>
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streamsize
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basic_streambuf<_CharT, _Traits>::
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xsgetn(char_type* __s, streamsize __n)
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{
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streamsize __ret = 0;
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while (__ret < __n)
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{
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const streamsize __buf_len = this->egptr() - this->gptr();
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if (__buf_len)
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{
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const streamsize __remaining = __n - __ret;
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const streamsize __len = std::min(__buf_len, __remaining);
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traits_type::copy(__s, this->gptr(), __len);
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__ret += __len;
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__s += __len;
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this->gbump(__len);
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}
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if (__ret < __n)
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{
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const int_type __c = this->uflow();
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if (!traits_type::eq_int_type(__c, traits_type::eof()))
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{
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traits_type::assign(*__s++, traits_type::to_char_type(__c));
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++__ret;
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}
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else
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break;
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}
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}
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return __ret;
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}
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template<typename _CharT, typename _Traits>
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streamsize
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basic_streambuf<_CharT, _Traits>::
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xsputn(const char_type* __s, streamsize __n)
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{
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streamsize __ret = 0;
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while (__ret < __n)
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{
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const streamsize __buf_len = this->epptr() - this->pptr();
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if (__buf_len)
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{
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const streamsize __remaining = __n - __ret;
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const streamsize __len = std::min(__buf_len, __remaining);
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traits_type::copy(this->pptr(), __s, __len);
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__ret += __len;
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__s += __len;
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this->pbump(__len);
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}
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if (__ret < __n)
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{
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int_type __c = this->overflow(traits_type::to_int_type(*__s));
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if (!traits_type::eq_int_type(__c, traits_type::eof()))
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{
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++__ret;
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++__s;
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}
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else
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break;
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}
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}
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return __ret;
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}
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// Conceivably, this could be used to implement buffer-to-buffer
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// copies, if this was ever desired in an un-ambiguous way by the
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// standard.
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template<typename _CharT, typename _Traits>
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streamsize
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__copy_streambufs_eof(basic_streambuf<_CharT, _Traits>* __sbin,
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basic_streambuf<_CharT, _Traits>* __sbout,
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bool& __ineof)
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{
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streamsize __ret = 0;
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__ineof = true;
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typename _Traits::int_type __c = __sbin->sgetc();
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while (!_Traits::eq_int_type(__c, _Traits::eof()))
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{
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__c = __sbout->sputc(_Traits::to_char_type(__c));
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if (_Traits::eq_int_type(__c, _Traits::eof()))
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{
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__ineof = false;
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break;
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}
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++__ret;
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__c = __sbin->snextc();
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}
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return __ret;
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}
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template<typename _CharT, typename _Traits>
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inline streamsize
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__copy_streambufs(basic_streambuf<_CharT, _Traits>* __sbin,
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basic_streambuf<_CharT, _Traits>* __sbout)
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{
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bool __ineof;
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return __copy_streambufs_eof(__sbin, __sbout, __ineof);
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}
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// Inhibit implicit instantiations for required instantiations,
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// which are defined via explicit instantiations elsewhere.
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// NB: This syntax is a GNU extension.
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#if _GLIBCXX_EXTERN_TEMPLATE
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extern template class basic_streambuf<char>;
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extern template
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streamsize
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__copy_streambufs(basic_streambuf<char>*,
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basic_streambuf<char>*);
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extern template
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streamsize
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__copy_streambufs_eof(basic_streambuf<char>*,
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basic_streambuf<char>*, bool&);
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#ifdef _GLIBCXX_USE_WCHAR_T
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extern template class basic_streambuf<wchar_t>;
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extern template
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streamsize
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__copy_streambufs(basic_streambuf<wchar_t>*,
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basic_streambuf<wchar_t>*);
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extern template
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streamsize
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__copy_streambufs_eof(basic_streambuf<wchar_t>*,
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basic_streambuf<wchar_t>*, bool&);
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#endif
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#endif
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_GLIBCXX_END_NAMESPACE
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#endif
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