566 lines
15 KiB
C++
566 lines
15 KiB
C++
// File 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: 27.8 File-based streams
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//
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#ifndef _CPP_BITS_FSTREAM_TCC
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#define _CPP_BITS_FSTREAM_TCC 1
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namespace std
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{
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template<typename _CharT, typename _Traits>
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void
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basic_filebuf<_CharT, _Traits>::
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_M_init_filebuf(void)
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{
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_M_buf_unified = true; // Tie input to output for basic_filebuf.
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_M_buf_size = static_cast<int_type>(BUFSIZ * sizeof(char_type));
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try {
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_M_file = new __file_type(&_M_lock);
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}
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catch(...) {
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delete _M_file;
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throw;
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}
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::
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basic_filebuf()
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: __streambuf_type(), _M_file(NULL), _M_last_overflowed(false),
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_M_state_cur(), _M_state_beg()
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{ _M_fcvt = &use_facet<__codecvt_type>(this->getloc()); }
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::
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basic_filebuf(int __fd, const char* /*__name*/, ios_base::openmode __mode)
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: __streambuf_type(), _M_last_overflowed(false),
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_M_state_cur(), _M_state_beg()
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{
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_M_fcvt = &use_facet<__codecvt_type>(this->getloc());
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_M_init_filebuf();
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_M_file->sys_open(__fd, __mode);
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if (this->is_open() && _M_buf_size)
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{
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_M_mode = __mode;
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// XXX So that istream::getc() will only need to get 1 char,
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// as opposed to BUF_SIZE.
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if (__fd == 0)
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_M_buf_size = 1;
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try {
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_M_buf = new char_type[_M_buf_size];
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}
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catch(...) {
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delete [] _M_buf;
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throw;
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}
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this->_M_set_indeterminate();
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}
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::__filebuf_type*
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basic_filebuf<_CharT, _Traits>::
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open(const char* __s, ios_base::openmode __mode)
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{
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__filebuf_type *__retval = NULL;
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if (!this->is_open())
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{
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_M_init_filebuf();
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_M_file->open(__s, __mode);
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if (this->is_open() && _M_buf_size)
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{
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_M_mode = __mode;
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try {
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_M_buf = new char_type[_M_buf_size];
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}
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catch(...) {
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delete [] _M_buf;
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throw;
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}
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// For time being, set both (in/out) sets of pointers.
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_M_set_indeterminate();
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if (__mode & ios_base::ate
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&& this->seekoff(0, ios_base::end, __mode) < 0)
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this->close();
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__retval = this;
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}
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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_filebuf<_CharT, _Traits>::__filebuf_type*
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basic_filebuf<_CharT, _Traits>::
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close()
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{
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__filebuf_type *__retval = NULL;
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if (this->is_open())
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{
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bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
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if (__testput)
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_M_really_overflow(traits_type::eof());
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#if 0
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// XXX not done
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if (_M_last_overflowed)
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{
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_M_output_unshift();
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_M_really_overflow(traits_type::eof());
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}
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#endif
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if (_M_file->close())
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{
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_M_mode = ios_base::openmode(0);
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if (_M_buf_size)
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delete [] _M_buf;
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_M_buf = NULL;
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this->setg(NULL, NULL, NULL);
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this->setp(NULL, NULL);
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__retval = this;
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}
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}
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_M_last_overflowed = false;
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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_filebuf<_CharT, _Traits>::
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showmanyc()
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{
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streamsize __retval = -1;
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bool __testin = _M_mode & ios_base::in;
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if (__testin)
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{
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bool __testeof = false;
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if (_M_in_cur >= _M_in_end)
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__testeof = this->underflow() == traits_type::eof();
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if (!__testeof)
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__retval = (_M_in_end - _M_in_cur) / sizeof(char_type);
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}
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_M_last_overflowed = false;
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::int_type
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basic_filebuf<_CharT, _Traits>::
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underflow()
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{
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int_type __retval = traits_type::eof();
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bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
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bool __testinit = _M_is_indeterminate();
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bool __testout = _M_mode & ios_base::out;
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bool __testin = _M_mode & ios_base::in;
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if (__testin)
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{
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// Sync internal and external buffers.
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// NB: __testget -> __testput as _M_buf_unified here.
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if (__testget)
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{
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if (__testout)
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_M_really_overflow();
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else
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_M_file->seekoff(_M_in_cur - _M_in_beg,
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ios_base::cur, ios_base::in);
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}
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if (__testinit || __testget)
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{
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// Part one: (Re)fill external buf (_M_file->_IO_*) from
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// external byte sequence (whatever physical byte sink or
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// FILE actually is.)
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char __conv_buf[_M_buf_size];
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streamsize __size = _M_file->xsgetn(__conv_buf, _M_buf_size);
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// Part two: (Re)fill internal buf contents from external buf.
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if (0 < __size)
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{
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_M_set_determinate(__size);
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char* __conv_cur = __conv_buf;
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_M_state_beg = _M_state_cur;
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__res_type __r = _M_fcvt->in(_M_state_cur,
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__conv_buf,
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__conv_buf + __size,
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const_cast<const char*&>(__conv_cur),
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_M_in_beg, _M_in_end, _M_in_cur);
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if (__r == codecvt_base::partial)
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{
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// XXX Retry with larger _M_buf size.
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}
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// Set pointers to internal and external buffers
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// correctly. . .
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if (__r != codecvt_base::error)
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{
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if (__testout)
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_M_out_cur = _M_in_cur;
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__retval = traits_type::to_int_type(*_M_in_cur);
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}
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// Part three: Sync the current internal buffer
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// position with the (now overshot) external buffer
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// position.
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streamoff __p = _M_file->seekoff(0 - __size, ios_base::cur,
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ios_base::in);
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if (__p == -1)
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{
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// XXX Something is wrong, do error checking.
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}
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}
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}
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}
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_M_last_overflowed = false;
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::int_type
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basic_filebuf<_CharT, _Traits>::
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pbackfail(int_type __i)
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{
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int_type __retval = traits_type::eof();
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char_type __c = traits_type::to_char_type(__i);
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bool __testeof = traits_type::eq_int_type(__i, traits_type::eof());
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bool __testout = _M_mode & ios_base::out;
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bool __testin = _M_mode & ios_base::in;
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if (__testin)
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{
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if (!_M_is_indeterminate())
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{
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bool __testpb = _M_in_beg < _M_in_cur;
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bool __testeq = traits_type::eq(__c, this->gptr()[-1]);
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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 && __testpb && __testeq)
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{
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--_M_in_cur;
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if (__testout)
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--_M_out_cur;
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__retval = __i;
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}
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else if (!__testeof && __testpb && __testout)
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{
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--_M_in_cur;
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if (__testout)
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--_M_out_cur;
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*_M_in_cur = __c;
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__retval = __i;
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}
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else if (__testeof && __testpb)
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{
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--_M_in_cur;
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if (__testout)
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--_M_out_cur;
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__retval = traits_type::not_eof(__i);
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}
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}
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else
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{
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// Need to make a putback position available.
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this->seekoff(-1, ios_base::cur);
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this->underflow();
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if (!__testeof)
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{
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*_M_in_cur = __c;
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__retval = __c;
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}
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else
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__retval = traits_type::not_eof(__i);
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}
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}
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_M_last_overflowed = false;
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::int_type
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basic_filebuf<_CharT, _Traits>::
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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 __testpos = _M_out_cur && _M_out_cur >= _M_buf + _M_buf_size;
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bool __testout = _M_mode & ios_base::out;
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if (__testout)
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{
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if (!__testpos)
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{
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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 = traits_type::not_eof(__c);
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}
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else
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__retval = this->_M_really_overflow(__c);
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}
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_M_last_overflowed = false; // Set in _M_really_overflow, below.
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::int_type
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basic_filebuf<_CharT, _Traits>::
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_M_really_overflow(int_type __c)
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{
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int_type __retval = traits_type::eof();
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bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
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bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
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if (__testput)
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{
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// Part one: Allocate temporary conversion buffer on
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// stack. Convert internal buffer plus __c (ie,
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// "pending sequence") to temporary conversion buffer.
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int __plen = _M_out_end - _M_out_beg;
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char_type __pbuf[__plen + sizeof(char_type)];
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traits_type::copy(__pbuf, this->pbase(), __plen);
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if (!__testeof)
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{
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__pbuf[__plen] = traits_type::to_char_type(__c);
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++__plen;
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}
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char_type* __pend;
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char __conv_buf[__plen];
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char* __conv_end;
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_M_state_beg = _M_state_cur;
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__res_type __r = _M_fcvt->out(_M_state_cur,
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__pbuf, __pbuf + __plen,
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const_cast<const char_type*&>(__pend),
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__conv_buf, __conv_buf + __plen,
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__conv_end);
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// Part two: (Re)spill converted "pending sequence"
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// contents (now in temporary conversion buffer) to
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// external buffer (_M_file->_IO_*) using
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// _M_file->sys_write(), and do error (minimal) checking.
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if (__r != codecvt_base::error)
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{
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streamsize __len = _M_file->xsputn(__conv_buf, __plen);
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// NB: Need this so that external byte sequence reflects
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// internal buffer.
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_M_file->sync();
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if (__len == __plen)
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{
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_M_set_indeterminate();
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__retval = traits_type::not_eof(__c);
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}
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}
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}
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_M_last_overflowed = true;
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::pos_type
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basic_filebuf<_CharT, _Traits>::
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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 __testopen = this->is_open();
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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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int __width = _M_fcvt->encoding();
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if (__width < 0)
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__width = 0;
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bool __testfail = __off != 0 && __width <= 0;
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if (__testopen && !__testfail && (__testin || __testout))
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{
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if (__way != ios_base::cur || __off != 0)
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{
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off_type __computed_off = __width * __off;
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bool __testget = _M_in_cur && _M_in_beg < _M_in_end;
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bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
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// Sync the internal and external streams.
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// out
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if (__testput || _M_last_overflowed)
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{
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// Part one: update the output sequence.
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this->sync();
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// Part two: output unshift sequence.
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_M_output_unshift();
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}
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//in
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// NB: underflow() rewinds the external buffer.
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else if (__testget && __way == ios_base::cur)
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__computed_off += _M_in_cur - _M_in_beg;
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__retval = _M_file->seekoff(__computed_off, __way, __mode);
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_M_set_indeterminate();
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}
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// NB: Need to do this in case _M_file in indeterminate
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// state, ie _M_file->_offset == -1
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else
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{
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__retval = _M_file->seekoff(__off, ios_base::cur, __mode);
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__retval += max(_M_out_cur, _M_in_cur) - _M_buf;
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}
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}
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_M_last_overflowed = false;
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::pos_type
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basic_filebuf<_CharT, _Traits>::
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seekpos(pos_type __pos, ios_base::openmode __mode)
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{
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pos_type __retval;
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off_type __off = __pos;
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__retval = this->seekoff(__off, ios_base::beg, __mode);
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_M_last_overflowed = false;
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return __retval;
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}
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template<typename _CharT, typename _Traits>
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void
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basic_filebuf<_CharT, _Traits>::
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_M_output_unshift()
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{
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#if 0
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// XXX Not complete, or correct.
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int __width = _M_fcvt->encoding();
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if (__width < 0)
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{
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// Part one: call codecvt::unshift
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int __unsft_len = 0;
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char_type __unsft_buf[_M_buf_size];
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char_type* __unsft_cur; // XXX Set to external buf.
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_M_state_beg = _M_state_cur;
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__res_type __r = _M_fcvt->unshift(_M_state_cur,
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__unsft_buf,
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__unsft_buf + _M_buf_size,
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__unsft_cur);
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// Note, for char_type == char, wchar_t unshift
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// should store no charachers.
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if (__r == codecvt_base::ok || __r == codecvt_base::noconv)
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__unsft_len = __unsft_cur - __unsft_buf;
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|
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// "Output the resulting sequence."
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if (__unsft_len)
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{
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int __plen = _M_out_cur - _M_out_beg;
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int __rlen = __plen + __unsft_len;
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char_type __rbuf[__rlen];
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char_type* __rend;
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traits_type::copy(__rbuf, this->pbase(), __plen);
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traits_type::copy(__rbuf + __plen, __unsft_buf,
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__unsft_len);
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|
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char __conv_buf[__rlen];
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char* __conv_end;
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|
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_M_state_beg = _M_state_cur; // XXX Needed?
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__r = _M_fcvt->out(_M_state_cur,
|
|
__rbuf, __rbuf + __rlen,
|
|
const_cast<const char_type*&>(__rend),
|
|
__conv_buf,
|
|
__conv_buf + __rlen,
|
|
__conv_end);
|
|
|
|
if (__r != codecvt_base::error)
|
|
{
|
|
streamsize __r = _M_file->xsputn(__conv_buf, __rlen);
|
|
if (__r == __rlen)
|
|
{
|
|
_M_out_cur = _M_out_beg;
|
|
if (_M_mode & ios_base::in)
|
|
_M_in_cur = _M_out_cur;
|
|
}
|
|
else
|
|
{
|
|
// XXX Throw "wig out and die exception?"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
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|
|
template<typename _CharT, typename _Traits>
|
|
void
|
|
basic_filebuf<_CharT, _Traits>::
|
|
imbue(const locale& __loc)
|
|
{
|
|
bool __testbeg = gptr() == eback() && pptr() == pbase();
|
|
bool __teststate = _M_fcvt->encoding() == -1;
|
|
|
|
_M_locale_set = true;
|
|
if (__testbeg && !__teststate && _M_locale_buf != __loc)
|
|
{
|
|
// XXX Will need to save these older values.
|
|
_M_locale_buf = __loc;
|
|
_M_fcvt = &use_facet<__codecvt_type>(_M_locale_buf);
|
|
// XXX Necessary?
|
|
_M_fctype_buf = &use_facet<__ctype_type>(_M_locale_buf);
|
|
}
|
|
// NB this may require the reconversion of previously
|
|
// converted chars. This in turn may cause the reconstruction
|
|
// of the original file. YIKES!!
|
|
// XXX The part in the above comment is not done.
|
|
_M_last_overflowed = false;
|
|
}
|
|
|
|
} // namespace std
|
|
|
|
#endif // _CPP_BITS_FSTREAM_TCC
|
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