4c526d0960
2003-06-18 Paolo Carlini <pcarlini@unitus.it> * include/bits/sstream.tcc (seekoff): We can't seek beyond _M_out_lim, therefore _M_move_out_cur boils down to simply updating _M_out_cur. (seekpos): Likewise, clean up. From-SVN: r68162
219 lines
7.5 KiB
C++
219 lines
7.5 KiB
C++
// String based streams -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003
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// 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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#pragma GCC system_header
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#include <sstream>
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namespace std
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{
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template <class _CharT, class _Traits, class _Alloc>
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typename 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 __ret = traits_type::eof();
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const bool __testeof = traits_type::eq_int_type(__c, __ret);
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if (this->_M_in_beg < this->_M_in_cur)
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{
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const bool __testeq = traits_type::eq(traits_type::to_char_type(__c),
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this->_M_in_cur[-1]);
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--this->_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 && __testeq)
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__ret = __c;
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else if (__testeof)
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__ret = traits_type::not_eof(__c);
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else
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{
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*this->_M_in_cur = traits_type::to_char_type(__c);
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__ret = __c;
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}
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}
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return __ret;
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}
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template <class _CharT, class _Traits, class _Alloc>
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typename 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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const bool __testout = this->_M_mode & ios_base::out;
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if (__builtin_expect(!__testout, false))
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return traits_type::eof();
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const bool __testeof = traits_type::eq_int_type(__c,
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traits_type::eof());
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if (__builtin_expect(__testeof, false))
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return traits_type::not_eof(__c);
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// NB: Start ostringstream buffers at 512 chars. This is an
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// experimental value (pronounced "arbitrary" in some of the
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// hipper english-speaking countries), and can be changed to
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// suit particular needs.
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__size_type __len = std::max(__size_type(_M_string.capacity() + 1),
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__size_type(512));
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const bool __testput = this->_M_out_cur < this->_M_out_end;
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if (__builtin_expect(!__testput && __len > _M_string.max_size(), false))
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return traits_type::eof();
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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 (!__testput)
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{
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// In virtue of DR 169 (TC) we are allowed to grow more than
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// one char. That's easy to implement thanks to the exponential
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// growth policy builtin into basic_string.
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__string_type __tmp;
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__tmp.reserve(__len);
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__tmp.assign(_M_string.data(),
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this->_M_out_end - this->_M_out_beg);
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_M_string.swap(__tmp);
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// Just to be sure...
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_M_string.reserve(__len);
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_M_sync(const_cast<char_type*>(_M_string.data()),
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this->_M_in_cur - this->_M_in_beg,
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this->_M_out_cur - this->_M_out_beg);
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}
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return this->sputc(traits_type::to_char_type(__c));
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}
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template <class _CharT, class _Traits, class _Alloc>
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typename 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 __ret = pos_type(off_type(-1));
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bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
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bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
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const bool __testboth = __testin && __testout && __way != ios_base::cur;
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__testin &= !(__mode & ios_base::out);
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__testout &= !(__mode & ios_base::in);
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if (_M_string.capacity() && (__testin || __testout || __testboth))
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{
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char_type* __beg = __testin ? this->_M_in_beg : this->_M_out_beg;
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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 = this->_M_in_cur - __beg;
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__newoffo = this->_M_out_cur - __beg;
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}
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else if (__way == ios_base::end)
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{
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__newoffi = this->_M_in_end - __beg;
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// Due to the resolution of DR169, ios_base::end
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// is this->_M_out_lim, not _M_out_end.
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__newoffo = this->_M_out_lim - __beg;
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}
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if ((__testin || __testboth)
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&& __newoffi + __off >= 0
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&& this->_M_in_end - __beg >= __newoffi + __off)
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{
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this->_M_in_cur = __beg + __newoffi + __off;
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__ret = pos_type(__newoffi);
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}
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if ((__testout || __testboth)
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&& __newoffo + __off >= 0
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&& this->_M_out_lim - __beg >= __newoffo + __off)
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{
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this->_M_out_cur = __beg + __newoffo + __off;
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__ret = pos_type(__newoffo);
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}
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}
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return __ret;
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}
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template <class _CharT, class _Traits, class _Alloc>
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typename 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 __ret = pos_type(off_type(-1));
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if (_M_string.capacity())
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{
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off_type __pos = __sp; // Use streamoff operator to do conversion.
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const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
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const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
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char_type* __beg = __testin ? this->_M_in_beg : this->_M_out_beg;
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// NB: Ordered.
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bool __testposi = false;
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bool __testposo = false;
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if (__testin && 0 <= __pos
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&& __pos <= this->_M_in_end - __beg)
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__testposi = true;
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if (__testout && 0 <= __pos
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&& __pos <= this->_M_out_lim - __beg)
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__testposo = true;
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if (__testposi || __testposo)
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{
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if (__testposi)
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this->_M_in_cur = __beg + __pos;
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if (__testposo)
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this->_M_out_cur = __beg + __pos;
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__ret = pos_type(off_type(__pos));
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}
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}
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return __ret;
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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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extern template class basic_stringbuf<char>;
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extern template class basic_istringstream<char>;
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extern template class basic_ostringstream<char>;
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extern template class basic_stringstream<char>;
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#ifdef _GLIBCPP_USE_WCHAR_T
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extern template class basic_stringbuf<wchar_t>;
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extern template class basic_istringstream<wchar_t>;
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extern template class basic_ostringstream<wchar_t>;
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extern template class basic_stringstream<wchar_t>;
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#endif
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} // namespace std
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#endif
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