forked from KolibriOS/kolibrios
606 lines
16 KiB
C++
606 lines
16 KiB
C++
// File based streams -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2000, 2001 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_allocate_file()
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{
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if (!_M_file)
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{
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_M_buf_unified = true; // Tie input to output for basic_filebuf.
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try
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{ _M_file = new __file_type(&_M_lock); }
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catch(...)
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{
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delete _M_file;
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__throw_exception_again;
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}
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}
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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_allocate_internal_buffer()
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{
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if (!_M_buf && _M_buf_size_opt)
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{
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_M_buf_size = _M_buf_size_opt;
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// Allocate internal buffer.
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try { _M_buf = new char_type[_M_buf_size]; }
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catch(...)
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{
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delete [] _M_buf;
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__throw_exception_again;
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}
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_M_buf_allocated = true;
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}
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}
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// Both close and setbuf need to deallocate internal buffers, if it exists.
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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_destroy_internal_buffer()
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{
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if (_M_buf_allocated)
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{
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delete [] _M_buf;
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_M_buf = NULL;
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_M_buf_allocated = false;
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this->setg(NULL, NULL, NULL);
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this->setp(NULL, NULL);
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}
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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_allocate_pback_buffer()
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{
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if (!_M_pback && _M_pback_size)
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{
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// Allocate pback buffer.
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try
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{ _M_pback = new char_type[_M_pback_size]; }
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catch(...)
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{
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delete [] _M_pback;
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__throw_exception_again;
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}
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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_state_cur(__state_type()),
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_M_state_beg(__state_type()), _M_buf_allocated(false),
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_M_last_overflowed(false)
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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(__c_file_type* __f, ios_base::openmode __mode, int_type __s)
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: __streambuf_type(), _M_file(NULL), _M_state_cur(__state_type()),
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_M_state_beg(__state_type()), _M_buf_allocated(false),
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_M_last_overflowed(false)
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{
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_M_allocate_file();
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_M_file->sys_open(__f, __mode);
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if (this->is_open())
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{
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_M_mode = __mode;
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if (__s)
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{
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_M_buf_size_opt = __s;
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_M_allocate_internal_buffer();
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_M_set_indeterminate();
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}
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_M_allocate_pback_buffer();
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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 *__ret = NULL;
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if (!this->is_open())
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{
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_M_allocate_file();
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_M_file->open(__s, __mode);
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if (this->is_open())
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{
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_M_allocate_internal_buffer();
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_M_allocate_pback_buffer();
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_M_mode = __mode;
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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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__ret = this;
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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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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 *__ret = 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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// NB: Do this here so that re-opened filebufs will be cool...
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_M_pback_destroy();
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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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_M_mode = ios_base::openmode(0);
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_M_destroy_internal_buffer();
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if (_M_pback)
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{
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delete [] _M_pback;
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_M_pback = NULL;
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}
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__ret = this;
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}
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// Can actually allocate this file as part of an open and never
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// have it be opened.....
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if (_M_file)
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{
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delete _M_file;
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_M_file = NULL;
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}
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_M_last_overflowed = false;
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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_filebuf<_CharT, _Traits>::
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showmanyc()
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{
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streamsize __ret = -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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__ret = _M_in_end - _M_in_cur;
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}
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_M_last_overflowed = false;
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return __ret;
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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 __ret = traits_type::eof();
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bool __testin = _M_mode & ios_base::in;
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bool __testout = _M_mode & ios_base::out;
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// XXX Should re-enable codecvt bits disabled after 2.90.8.
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if (__testin)
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{
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// Check for pback madness, and if so swich back to the
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// normal buffers and jet outta here before expensive
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// fileops happen...
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if (_M_pback_init)
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{
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_M_pback_destroy();
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if (_M_in_cur < _M_in_end)
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return traits_type::to_int_type(*_M_in_cur);
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}
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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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// 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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#if _GLIBCPP_AVOID_FSEEK
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else if ((_M_in_cur - _M_in_beg) == 1)
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_M_file->sys_getc();
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#endif
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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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// Assume buffered case, need to refill internal buffers.
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streamsize __size = _M_file->xsgetn(_M_in_beg, _M_buf_size);
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if (0 < __size)
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{
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_M_set_determinate(__size);
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if (__testout)
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_M_out_cur = _M_in_cur;
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__ret = traits_type::to_int_type(*_M_in_cur);
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#if _GLIBCPP_AVOID_FSEEK
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if (__size == 1)
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_M_file->sys_ungetc(*_M_in_cur);
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else
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{
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#endif
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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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#if _GLIBCPP_AVOID_FSEEK
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}
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#endif
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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 __ret;
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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 __ret = traits_type::eof();
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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 __testpb = _M_in_beg < _M_in_cur;
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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, __ret);
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if (__testpb)
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{
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bool __testout = _M_mode & ios_base::out;
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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 && __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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__ret = __i;
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}
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else if (__testeof)
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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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__ret = traits_type::not_eof(__i);
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}
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else if (!__testeof)
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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_pback_create();
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*_M_in_cur = __c;
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__ret = __i;
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}
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}
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else
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{
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// At the beginning of the buffer, need to make a
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// 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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if (!traits_type::eq(__c, *_M_in_cur))
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{
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_M_pback_create();
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*_M_in_cur = __c;
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}
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__ret = __i;
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}
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else
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__ret = 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 __ret;
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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 __ret = traits_type::eof();
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bool __testput = _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 (__testput)
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{
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*_M_out_cur = traits_type::to_char_type(__c);
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_M_out_cur_move(1);
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__ret = traits_type::not_eof(__c);
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}
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else
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__ret = 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 __ret;
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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 __ret = traits_type::eof();
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bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
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bool __testunbuffered = _M_file && !_M_buf_size;
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if (__testput || __testunbuffered)
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{
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#if 1
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int __plen = _M_out_end - _M_out_beg;
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streamsize __len = 0;
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if (__plen)
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__len = _M_file->xsputn(_M_out_beg, __plen);
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if (__c !=traits_type::eof())
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{
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char_type __pending = traits_type::to_char_type(__c);
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__len += _M_file->xsputn(&__pending, 1);
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++__plen;
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}
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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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__ret = traits_type::not_eof(__c);
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}
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#else
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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 = static_cast<char_type*>(__builtin_alloca(sizeof(char_type) * __plen + 1));
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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 = static_cast<char*>(__builtin_alloca(__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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__ret = traits_type::not_eof(__c);
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}
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}
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#endif
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}
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_M_last_overflowed = true;
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return __ret;
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}
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template<typename _CharT, typename _Traits>
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basic_filebuf<_CharT, _Traits>::__streambuf_type*
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basic_filebuf<_CharT, _Traits>::
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setbuf(char_type* __s, streamsize __n)
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{
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if (!this->is_open() && __s == 0 && __n == 0)
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_M_buf_size_opt = 0;
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else if (__s && __n)
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{
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// This is implementation-defined behavior, and assumes
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// that an external char_type array of length (__s + __n)
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// exists and has been pre-allocated. If this is not the
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// case, things will quickly blow up.
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// Step 1: Destroy the current internal array.
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_M_destroy_internal_buffer();
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// Step 2: Use the external array.
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_M_buf = __s;
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_M_buf_size_opt = _M_buf_size = __n;
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_M_set_indeterminate();
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// Step 3: Make sure a pback buffer is allocated.
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_M_allocate_pback_buffer();
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}
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_M_last_overflowed = false;
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return this;
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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 __ret = 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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// Should probably do has_facet checks here.
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int __width = use_facet<__codecvt_type>(_M_buf_locale).encoding();
|
|
if (__width < 0)
|
|
__width = 0;
|
|
bool __testfail = __off != 0 && __width <= 0;
|
|
|
|
if (__testopen && !__testfail && (__testin || __testout))
|
|
{
|
|
// Ditch any pback buffers to avoid confusion.
|
|
_M_pback_destroy();
|
|
|
|
if (__way != ios_base::cur || __off != 0)
|
|
{
|
|
off_type __computed_off = __width * __off;
|
|
|
|
bool __testget = _M_in_cur && _M_in_beg < _M_in_end;
|
|
bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
|
|
// Sync the internal and external streams.
|
|
// out
|
|
if (__testput || _M_last_overflowed)
|
|
{
|
|
// Part one: update the output sequence.
|
|
this->sync();
|
|
// Part two: output unshift sequence.
|
|
_M_output_unshift();
|
|
}
|
|
//in
|
|
// NB: underflow() rewinds the external buffer.
|
|
else if (__testget && __way == ios_base::cur)
|
|
__computed_off += _M_in_cur - _M_in_beg;
|
|
|
|
__ret = _M_file->seekoff(__computed_off, __way, __mode);
|
|
_M_set_indeterminate();
|
|
}
|
|
// NB: Need to do this in case _M_file in indeterminate
|
|
// state, ie _M_file->_offset == -1
|
|
else
|
|
{
|
|
__ret = _M_file->seekoff(__off, ios_base::cur, __mode);
|
|
__ret += max(_M_out_cur, _M_in_cur) - _M_buf;
|
|
}
|
|
}
|
|
_M_last_overflowed = false;
|
|
return __ret;
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
basic_filebuf<_CharT, _Traits>::pos_type
|
|
basic_filebuf<_CharT, _Traits>::
|
|
seekpos(pos_type __pos, ios_base::openmode __mode)
|
|
{
|
|
pos_type __ret;
|
|
off_type __off = __pos;
|
|
|
|
__ret = this->seekoff(__off, ios_base::beg, __mode);
|
|
|
|
_M_last_overflowed = false;
|
|
return __ret;
|
|
}
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
void
|
|
basic_filebuf<_CharT, _Traits>::
|
|
_M_output_unshift()
|
|
{ }
|
|
|
|
template<typename _CharT, typename _Traits>
|
|
void
|
|
basic_filebuf<_CharT, _Traits>::
|
|
imbue(const locale& __loc)
|
|
{
|
|
bool __testbeg = gptr() == eback() && pptr() == pbase();
|
|
|
|
if (__testbeg && _M_buf_locale != __loc)
|
|
{
|
|
_M_buf_locale = __loc;
|
|
_M_buf_locale_init = true;
|
|
}
|
|
|
|
// 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
|
|
|
|
|