gcc/libstdc++-v3/include/ext/stdio_filebuf.h
Paolo Carlini 71b460210a Nathan C.
2003-06-24  Paolo Carlini  <pcarlini@unitus.it>
            Nathan C. Myers  <ncm-nospam@cantrip.org>

	* include/std/std_fstream.h (_M_filepos): Remove.
	(_M_reading, _M_writing): New, encode the various I/O modes:
	'read', 'write' and 'uncommitted'.
	(sync): If there is something to flush, do it, then go to
	'uncommitted' mode.
	* include/bits/fstream.tcc (_M_set_buffer): Overhaul to deal
	with three different cases: __off > 0 (upon underflow),
	__off == 0 (upon overflow), __off == -1 (upon open, setbuf,
	seekoff/pos).
	(_M_underflow): Don't call overflow, set _M_reading to true
	on success, tweak.
	(pbackfail): Set _M_reading to true on pback creation, tweak.
	(overflow): Don't seek, deal with overflow in 'uncommitted' mode,
	set _M_writing to true on success, tweak.
	(seekoff): Simplify, set _M_reading, _M_writing to false, call
	_M_set_buffer(-1) ('uncommitted').
	(open, close, setbuf): Set _M_reading, _M_writing to false and
	call _M_set_buffer(-1), tweak.
	(basic_filebuf): Don't set _M_buf_unified.
	(_M_destroy_internal_buffer): Don't call setg and setp.
	* include/ext/stdio_filebuf.h (stdio_filebuf): Use _M_reading,
	_M_writing and _M_set_buffer(-1).
	* include/std/std_streambuf.h (_M_move_out_cur, _M_move_in_cur,
	_M_out_lim, _M_buf_unified): Remove.
	(basic_streambuf): Don't set _M_out_lim and _M_buf_unified.
	(setp): Don't set _M_out_lim.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-io.cc: Fix for
	the new logic ('read', 'write' and 'uncommitted' modes): e.g.,
	upon open the mode is 'uncommitted' and therefore the put area
	pointers are null.
	* testsuite/27_io/basic_filebuf/sbumpc/char/1-out.cc: Ditto.
	* testsuite/27_io/basic_filebuf/seekoff/char/3-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/seekpos/char/3-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/setbuf/char/1.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sgetc/char/1-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sgetc/char/1-out.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sgetn/char/1-out.cc: Ditto.
	* testsuite/27_io/basic_filebuf/snextc/char/1-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/snextc/char/1-out.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputbackc/char/1-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputbackc/char/1-out.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputc/char/1-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputc/char/1-out.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputc/char/9701-2.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputn/char/1-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputn/char/1-out.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sputn/char/9701-1.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sungetc/char/1-io.cc: Ditto.
	* testsuite/27_io/basic_filebuf/sungetc/char/1-out.cc: Ditto.

	* include/bits/fstream.tcc (showmanyc): Use only the
	documented derivation interface to basic_streambuf (gptr(),
	setg(), etc.) to work right with user specializations.
	* include/bits/streambuf.tcc (sbumpc, sputbackc, sungetc,
	sputc, xsgetn, xsputn, __copy_streambufs): Likewise.
	* include/std/std_streambuf.h (in_avail, sgetc, uflow, stossc):
	Likewise.
	* include/std/std_fstream.h (_M_create_pback, _M_destroy_pback,
	xsgetn): Likewise.

Co-Authored-By: Nathan C. Myers <ncm-nospam@cantrip.org>

From-SVN: r68420
2003-06-24 13:48:11 +00:00

155 lines
5.6 KiB
C++

// File descriptor layer for filebuf -*- C++ -*-
// Copyright (C) 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file ext/stdio_filebuf.h
* This file is a GNU extension to the Standard C++ Library.
*/
#ifndef _STDIO_FILEBUF_H
#define _STDIO_FILEBUF_H 1
#pragma GCC system_header
#include <fstream>
namespace __gnu_cxx
{
/**
* @class stdio_filebuf ext/stdio_filebuf.h <ext/stdio_filebuf.h>
* @brief Provides a layer of compatibility for C/POSIX.
*
* This GNU extension provides extensions for working with standard C
* FILE*'s and POSIX file descriptors. It must be instantiated by the
* user with the type of character used in the file stream, e.g.,
* stdio_filebuf<char>.
*/
template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
class stdio_filebuf : public std::basic_filebuf<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
typedef std::size_t size_t;
public:
/**
* @param fd An open file descriptor.
* @param mode Same meaning as in a standard filebuf.
* @param del Whether to close the file on destruction.
* @param size Optimal or preferred size of internal buffer, in bytes.
* Note that it includes a position for the overflow char,
* therefore, can't be smaller than 2.
*
* This constructor associates a file stream buffer with an open
* POSIX file descriptor. Iff @a del is true, then the associated
* file will be closed when the stdio_filebuf is closed/destroyed.
*/
stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del,
size_t __size = static_cast<size_t>(BUFSIZ));
/**
* @param f An open @c FILE*.
* @param mode Same meaning as in a standard filebuf.
* @param size Optimal or preferred size of internal buffer, in bytes.
* Defaults to system's @c BUFSIZ. Note that it includes
* a position for the overflow char, therefore, can't be
* smaller than 2.
*
* This constructor associates a file stream buffer with an open
* C @c FILE*. The @c FILE* will not be automatically closed when the
* stdio_filebuf is closed/destroyed.
*/
stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
size_t __size = static_cast<size_t>(BUFSIZ));
/**
* Possibly closes the external data stream, in the case of the file
* descriptor constructor and @c del @c == @c true.
*/
virtual
~stdio_filebuf();
/**
* @return The underlying file descriptor.
*
* Once associated with an external data stream, this function can be
* used to access the underlying POSIX file descriptor. Note that
* there is no way for the library to track what you do with the
* descriptor, so be careful.
*/
int
fd()
{ return this->_M_file.fd(); }
};
template<typename _CharT, typename _Traits>
stdio_filebuf<_CharT, _Traits>::~stdio_filebuf()
{ }
template<typename _CharT, typename _Traits>
stdio_filebuf<_CharT, _Traits>::
stdio_filebuf(int __fd, std::ios_base::openmode __mode, bool __del,
size_t __size)
{
this->_M_file.sys_open(__fd, __mode, __del);
if (this->is_open())
{
this->_M_mode = __mode;
this->_M_buf_size = __size;
_M_allocate_internal_buffer();
this->_M_reading = false;
this->_M_writing = false;
_M_set_buffer(-1);
}
}
template<typename _CharT, typename _Traits>
stdio_filebuf<_CharT, _Traits>::
stdio_filebuf(std::__c_file* __f, std::ios_base::openmode __mode,
size_t __size)
{
this->_M_file.sys_open(__f, __mode);
if (this->is_open())
{
this->_M_mode = __mode;
this->_M_buf_size = __size;
_M_allocate_internal_buffer();
this->_M_reading = false;
this->_M_writing = false;
_M_set_buffer(-1);
}
}
} // namespace __gnu_cxx
#endif