509 lines
15 KiB
C++
509 lines
15 KiB
C++
// File based streams -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2000, 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: 27.8 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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#pragma GCC system_header
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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_internal_buffer()
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{
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if (!this->_M_buf && this->_M_buf_size_opt)
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{
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this->_M_buf_size = this->_M_buf_size_opt;
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// Allocate internal buffer.
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this->_M_buf = new char_type[this->_M_buf_size];
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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 [] this->_M_buf;
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this->_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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basic_filebuf<_CharT, _Traits>::
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basic_filebuf() : __streambuf_type(), _M_file(&_M_lock),
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_M_state_cur(__state_type()), _M_state_beg(__state_type()),
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_M_buf_allocated(false), _M_last_overflowed(false)
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{ this->_M_buf_unified = true; }
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template<typename _CharT, typename _Traits>
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typename 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_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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this->_M_mode = __mode;
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// Setup initial position of buffer.
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_M_set_indeterminate();
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// Set input buffer to something real.
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// NB: Must open in non-blocking way to do this, or must
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// set the initial position in a different manner than
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// using underflow.
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if (__mode & ios_base::in && _M_buf_allocated)
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this->underflow();
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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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typename 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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const int_type __eof = traits_type::eof();
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bool __testput = this->_M_out_cur
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&& this->_M_out_beg < this->_M_out_end;
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if (__testput
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&& traits_type::eq_int_type(_M_really_overflow(__eof), __eof))
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return __ret;
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// NB: Do this here so that re-opened filebufs will be cool...
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this->_M_mode = ios_base::openmode(0);
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_M_destroy_internal_buffer();
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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(__eof);
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}
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#endif
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if (_M_file.close())
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__ret = this;
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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 = this->_M_mode & ios_base::in;
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if (__testin && this->is_open())
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__ret = this->_M_in_end - this->_M_in_cur;
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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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typename 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 = this->_M_mode & ios_base::in;
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if (__testin)
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{
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bool __testpb = this->_M_in_beg < this->_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 = this->_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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--this->_M_in_cur;
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if (__testout)
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--this->_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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--this->_M_in_cur;
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if (__testout)
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--this->_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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--this->_M_in_cur;
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if (__testout)
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--this->_M_out_cur;
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_M_pback_create();
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*this->_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, *this->_M_in_cur))
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{
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_M_pback_create();
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*this->_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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typename 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 = this->_M_out_cur
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&& this->_M_out_cur < this->_M_buf + this->_M_buf_size;
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bool __testout = this->_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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*this->_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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void
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basic_filebuf<_CharT, _Traits>::
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_M_convert_to_external(_CharT* __ibuf, streamsize __ilen,
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streamsize& __elen, streamsize& __plen)
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{
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const locale __loc = this->getloc();
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const __codecvt_type& __cvt = use_facet<__codecvt_type>(__loc);
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if (__cvt.always_noconv() && __ilen)
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{
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__elen += _M_file.xsputn(reinterpret_cast<char*>(__ibuf), __ilen);
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__plen += __ilen;
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}
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else
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{
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// Worst-case number of external bytes needed.
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int __ext_multiplier = __cvt.encoding();
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if (__ext_multiplier == -1 || __ext_multiplier == 0)
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__ext_multiplier = sizeof(char_type);
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streamsize __blen = __ilen * __ext_multiplier;
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char* __buf = static_cast<char*>(__builtin_alloca(__blen));
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char* __bend;
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const char_type* __iend;
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__res_type __r = __cvt.out(_M_state_cur, __ibuf, __ibuf + __ilen,
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__iend, __buf, __buf + __blen, __bend);
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// Result == ok, partial, noconv
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if (__r != codecvt_base::error)
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__blen = __bend - __buf;
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// Result == error
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else
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__blen = 0;
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if (__blen)
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{
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__elen += _M_file.xsputn(__buf, __blen);
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__plen += __blen;
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}
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// Try once more for partial conversions.
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if (__r == codecvt_base::partial)
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{
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const char_type* __iresume = __iend;
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streamsize __rlen = this->_M_out_end - __iend;
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__r = __cvt.out(_M_state_cur, __iresume, __iresume + __rlen,
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__iend, __buf, __buf + __blen, __bend);
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if (__r != codecvt_base::error)
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__rlen = __bend - __buf;
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else
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__rlen = 0;
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if (__rlen)
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{
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__elen += _M_file.xsputn(__buf, __rlen);
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__plen += __rlen;
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}
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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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typename 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 = this->_M_out_cur && this->_M_out_beg < this->_M_out_end;
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bool __testunbuffered = _M_file.is_open() && !this->_M_buf_size_opt;
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if (__testput || __testunbuffered)
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{
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// Sizes of external and pending output.
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streamsize __elen = 0;
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streamsize __plen = 0;
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// Need to restore current position. The position of the external
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// byte sequence (_M_file) corresponds to _M_filepos, and we need
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// to move it to _M_out_beg for the write.
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if (_M_filepos && _M_filepos != this->_M_out_beg)
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{
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off_type __off = this->_M_out_beg - _M_filepos;
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_M_file.seekoff(__off, ios_base::cur);
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}
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// Convert internal buffer to external representation, output.
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// NB: In the unbuffered case, no internal buffer exists.
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if (!__testunbuffered)
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_M_convert_to_external(this->_M_out_beg,
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this->_M_out_end - this->_M_out_beg,
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__elen, __plen);
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// Convert pending sequence to external representation, output.
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// If eof, then just attempt sync.
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if (!traits_type::eq_int_type(__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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_M_convert_to_external(&__pending, 1, __elen, __plen);
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// User code must flush when switching modes (thus don't sync).
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if (__elen == __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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else if (!_M_file.sync())
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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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_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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typename 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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this->_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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this->_M_buf = __s;
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this->_M_buf_size_opt = this->_M_buf_size = __n;
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_M_set_indeterminate();
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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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typename 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 __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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// Should probably do has_facet checks here.
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int __width = use_facet<__codecvt_type>(this->_M_buf_locale).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 (this->is_open() && !__testfail && (__testin || __testout))
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{
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// Ditch any pback buffers to avoid confusion.
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_M_pback_destroy();
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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 = this->_M_in_cur
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&& this->_M_in_beg < this->_M_in_end;
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bool __testput = this->_M_out_cur
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&& this->_M_out_beg < this->_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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else if (__testget && __way == ios_base::cur)
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__computed_off += this->_M_in_cur - _M_filepos;
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__ret = _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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__ret = _M_file.seekoff(__off, ios_base::cur, __mode);
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__ret +=
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std::max(this->_M_out_cur, this->_M_in_cur) - _M_filepos;
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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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typename 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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#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
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// 171. Strange seekpos() semantics due to joint position
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return this->seekoff(off_type(__pos), ios_base::beg, __mode);
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#endif
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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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template<typename _CharT, typename _Traits>
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void
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basic_filebuf<_CharT, _Traits>::
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imbue(const locale& __loc)
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{
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bool __testbeg = gptr() == eback() && pptr() == pbase();
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if (__testbeg && this->_M_buf_locale != __loc)
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{
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this->_M_buf_locale = __loc;
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this->_M_buf_locale_init = true;
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}
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// NB this may require the reconversion of previously
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// converted chars. This in turn may cause the reconstruction
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// of the original file. YIKES!!
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// XXX The part in the above comment is not done.
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_M_last_overflowed = false;
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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_filebuf<char>;
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extern template class basic_ifstream<char>;
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extern template class basic_ofstream<char>;
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extern template class basic_fstream<char>;
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#ifdef _GLIBCPP_USE_WCHAR_T
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extern template class basic_filebuf<wchar_t>;
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extern template class basic_ifstream<wchar_t>;
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extern template class basic_ofstream<wchar_t>;
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extern template class basic_fstream<wchar_t>;
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#endif
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} // namespace std
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#endif
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