259 lines
7.1 KiB
C++
259 lines
7.1 KiB
C++
// Stream buffer classes -*- C++ -*-
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// Copyright (C) 1997-1999 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 2, 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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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 27.5 Stream buffers
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//
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#ifndef _CPP_BITS_STREAMBUF_TCC
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#define _CPP_BITS_STREAMBUF_TCC 1
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namespace std {
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template<typename _CharT, typename _Traits>
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basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::
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sbumpc()
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{
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int_type __retval;
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if (_M_in_cur && _M_in_cur < _M_in_end)
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{
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char_type __c = *gptr();
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++_M_in_cur;
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if (_M_buf_unified && _M_mode & ios_base::out)
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++_M_out_cur;
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__retval = traits_type::to_int_type(__c);
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}
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else
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__retval = this->uflow();
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::
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sputbackc(char_type __c)
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{
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int_type __retval;
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bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur;
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bool __testne = _M_in_cur && !traits_type::eq(__c, this->gptr()[-1]);
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if (!__testpos || __testne)
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__retval = pbackfail(traits_type::to_int_type(__c));
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else
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{
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--_M_in_cur;
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if (_M_buf_unified && _M_mode & ios_base::out)
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--_M_out_cur;
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__retval = traits_type::to_int_type(*this->gptr());
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}
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::
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sungetc()
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{
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int_type __retval;
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if (_M_in_cur && _M_in_beg < _M_in_cur)
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{
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--_M_in_cur;
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if (_M_buf_unified && _M_mode & ios_base::out)
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--_M_out_cur;
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__retval = traits_type::to_int_type(*_M_in_cur);
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}
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else
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__retval = this->pbackfail();
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return __retval;
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}
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// Don't test against _M_buf + _M_buf_size, because _M_buf reflects
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// allocated space, and on certain (rare but entirely legal)
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// situations, there will be no allocated space yet the internal
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// buffers will still be valid. (This happens if setp is used to set
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// the internal buffer to say some externally-allocated sequence.)
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template<typename _CharT, typename _Traits>
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basic_streambuf<_CharT, _Traits>::int_type
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basic_streambuf<_CharT, _Traits>::
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sputc(char_type __c)
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{
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int_type __retval;
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if (_M_out_cur && _M_out_cur < _M_out_beg + _M_buf_size)
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{
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*_M_out_cur = __c;
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_M_buf_bump(1);
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__retval = traits_type::to_int_type(__c);
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}
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else
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__retval = this->overflow(traits_type::to_int_type(__c));
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return __retval;
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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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xsgetn(char_type* __s, streamsize __n)
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{
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bool __testout = _M_mode & ios_base::out;
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streamsize __retval = 0;
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if (__n)
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{
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while (__retval < __n)
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{
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if (_M_in_cur < _M_in_end)
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{
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size_t __len;
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if (_M_in_cur + __n - __retval <= _M_in_end)
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__len = __n - __retval;
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else
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__len = _M_in_end - _M_in_cur;
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traits_type::copy(__s, _M_in_cur, __len);
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__retval += __len;
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__s += __len;
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_M_in_cur += __len;
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if (_M_buf_unified && __testout)
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_M_out_cur += __len;
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}
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if (__retval != __n)
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{
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if (this->uflow() != traits_type::eof())
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++__retval;
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else
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break;
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}
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}
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}
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return __retval;
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}
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// Don't test against _M_buf + _M_buf_size, because _M_buf reflects
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// allocated space, and on certain (rare but entirely legal)
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// situations, there will be no allocated space yet the internal
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// buffers will still be valid. (This happens if setp is used to set
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// the internal buffer to say some externally-allocated sequence.)
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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 __retval = 0;
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if (__n)
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{
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while (__retval < __n)
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{
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bool __testput = _M_out_cur < _M_out_beg + _M_buf_size;
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bool __testout = _M_mode & ios_base::out;
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if (!(__testput && __testout))
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{
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char_type __c = *__s;
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char_type __overfc = this->overflow(__c);
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if (__c == __overfc)
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{
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++__retval;
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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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if (__retval != __n)
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{
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size_t __len;
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if (_M_out_cur + __n - __retval <= _M_out_beg + _M_buf_size)
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__len = __n - __retval;
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else
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__len = _M_out_beg + _M_buf_size - _M_out_cur;
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traits_type::copy(_M_out_cur, __s, __len);
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__retval += __len;
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__s += __len;
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_M_buf_bump(__len);
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}
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}
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}
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return __retval;
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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. If so, then checks for __ios being zero would be
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// necessary.
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template<typename _CharT, typename _Traits>
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static streamsize
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_S_copy_streambufs(basic_ios<_CharT, _Traits>& __ios,
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basic_streambuf<_CharT, _Traits>* __sbin,
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basic_streambuf<_CharT, _Traits>* __sbout)
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{
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typedef typename _Traits::int_type int_type;
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streamsize __retval = 0;
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streamsize __bufsize = __sbin->in_avail();
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streamsize __xtrct;
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bool __testout = __sbin->_M_mode & ios_base::out;
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bool __testput = __sbout->_M_mode & ios_base::out;
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try {
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while (__testput && __bufsize != -1)
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{
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__xtrct = __sbout->sputn(__sbin->gptr(), __bufsize);
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__retval += __xtrct;
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__sbin->_M_in_cur += __xtrct;
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if (__testout && __sbin->_M_buf_unified)
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__sbin->_M_out_cur += __xtrct;
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if (__xtrct == __bufsize)
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{
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int_type __c = __sbin->sgetc();
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if (__c == _Traits::eof())
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{
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__ios.setstate(ios_base::eofbit);
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break;
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}
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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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catch(exception& __fail) {
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if ((__ios.exceptions() & ios_base::failbit) != 0)
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throw;
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}
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return __retval;
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}
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} // namespace std
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#endif // _CPP_BITS_STREAMBUF_TCC
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