222 lines
6.5 KiB
C++
222 lines
6.5 KiB
C++
// String based streams -*- 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: 27.7 String-based streams
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//
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#ifndef _CPP_BITS_SSTREAM_TCC
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#define _CPP_BITS_SSTREAM_TCC 1
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#include <bits/std_sstream.h>
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namespace std {
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template <class _CharT, class _Traits, class _Alloc>
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basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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pbackfail(int_type __c)
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{
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int_type __retval = traits_type::eof();
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bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
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bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur;
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// Try to put back __c into input sequence in one of three ways.
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// Order these tests done in is unspecified by the standard.
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if (!__testeof && __testpos
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&& traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]))
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{
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--_M_in_cur;
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__retval = __c;
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}
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else if (!__testeof && __testpos)
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{
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--_M_in_cur;
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*_M_in_cur = traits_type::to_char_type(__c);
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__retval = __c;
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}
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else if (__testeof && __testpos)
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{
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--_M_in_cur;
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__retval = traits_type::not_eof(__c);
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}
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return __retval;
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}
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template <class _CharT, class _Traits, class _Alloc>
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basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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overflow(int_type __c)
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{
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int_type __retval = traits_type::eof();
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bool __testeof = traits_type::eq_int_type(__c, __retval);
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bool __testwrite = _M_out_cur < _M_buf + _M_buf_size;
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bool __testout = _M_mode & ios_base::out;
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// Try to append __c into output sequence in one of two ways.
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// Order these tests done in is unspecified by the standard.
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if (__testout)
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{
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if (!__testeof)
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{
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// NB: Start ostringstream buffers at 1024 bytes. This
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// is an experimental value (pronounced "arbitrary" in
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// some of the hipper english-speaking countries), and
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// can be changed to suite particular needs.
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__size_type __len = max(_M_buf_size, static_cast<int_type>(512));
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__len *= 2;
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if (__testwrite)
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__retval = this->sputc(__c);
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else if (__len <= _M_string.max_size())
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{
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// Force-allocate, re-sync.
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_M_string = this->str();
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_M_string.reserve(__len);
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_M_buf_size = static_cast<int_type>(__len);
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_M_really_sync(_M_in_cur - _M_in_beg,
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_M_out_cur - _M_out_beg);
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*_M_out_cur = traits_type::to_char_type(__c);
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_M_buf_bump(1);
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__retval = __c;
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}
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}
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else
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__retval = traits_type::not_eof(__c);
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}
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return __retval;
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}
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template <class _CharT, class _Traits, class _Alloc>
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basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
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{
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pos_type __retval = pos_type(off_type(-1));
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bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
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bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
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bool __testboth = __testin && __testout && __way != ios_base::cur;
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if (_M_buf_size && ((__testin != __testout) || __testboth))
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{
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char_type* __beg = _M_buf;
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char_type* __curi = NULL;
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char_type* __curo = NULL;
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char_type* __endi = NULL;
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char_type* __endo = NULL;
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if (__testin)
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{
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__curi = this->gptr();
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__endi = this->egptr();
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}
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if (__testout)
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{
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__curo = this->pptr();
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__endo = this->epptr();
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}
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off_type __newoffi = 0;
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off_type __newoffo = 0;
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if (__way == ios_base::cur)
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{
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__newoffi = __curi - __beg;
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__newoffo = __curo - __beg;
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}
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else if (__way == ios_base::end)
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{
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__newoffi = __endi - __beg;
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__newoffo = __endo - __beg;
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}
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if (__testin
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&& __newoffi + __off >= 0 && __endi - __beg >= __newoffi + __off)
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{
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_M_in_cur = __beg + __newoffi + __off;
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__retval = pos_type(__newoffi);
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}
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if (__testout
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&& __newoffo + __off >= 0 && __endo - __beg >= __newoffo + __off)
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{
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_M_buf_bump(__newoffo + __off - (_M_out_cur - __beg));
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__retval = pos_type(__newoffo);
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}
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}
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return __retval;
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}
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template <class _CharT, class _Traits, class _Alloc>
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basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
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basic_stringbuf<_CharT, _Traits, _Alloc>::
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seekpos(pos_type __sp, ios_base::openmode __mode)
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{
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pos_type __retval = pos_type(off_type(-1));
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off_type __pos = __sp._M_position();
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char_type* __beg = NULL;
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char_type* __end = NULL;
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bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
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bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
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if (__testin)
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{
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__beg = this->eback();
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__end = this->egptr();
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}
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if (__testout)
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{
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__beg = this->pbase();
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__end = _M_buf + _M_buf_size;
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}
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if (0 <= __pos && __pos <= __end - __beg)
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{
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// Need to set both of these if applicable
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if (__testin)
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_M_in_cur = _M_in_beg + __pos;
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if (__testout)
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_M_buf_bump((__pos) - (_M_out_cur - __beg));
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__retval = pos_type(off_type(__pos));
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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_SSTREAM_TCC */
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