forked from KolibriOS/kolibrios
253 lines
7.5 KiB
C++
253 lines
7.5 KiB
C++
// Wrapper of C-language FILE struct -*- C++ -*-
|
|
|
|
// Copyright (C) 1999, 2000, 2001 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.
|
|
|
|
//
|
|
// ISO C++ 14882: 27.8 File-based streams
|
|
//
|
|
|
|
#ifndef _CPP_BASIC_FILE
|
|
#define _CPP_BASIC_FILE 1
|
|
|
|
#pragma GCC system_header
|
|
|
|
#include <bits/c++config.h>
|
|
#include <bits/std_ios.h>
|
|
|
|
namespace std
|
|
{
|
|
// Ulrich is going to make some detailed comment here, explaining
|
|
// all this unpleasantness, providing detailed performance analysis
|
|
// as to why we have to do all this lame vtable hacking instead of a
|
|
// sane, function-based approach. This verbiage will provide a clear
|
|
// and detailed description of the whole object-layout,
|
|
// vtable-swapping, sordid history of this hack.
|
|
template<typename _CharT>
|
|
struct __basic_file_base: public __c_file_type
|
|
{
|
|
virtual
|
|
~__basic_file_base() { };
|
|
|
|
virtual int
|
|
overflow(int __c = EOF) = 0;
|
|
|
|
virtual int
|
|
underflow() = 0;
|
|
|
|
virtual int
|
|
uflow() = 0;
|
|
|
|
virtual int
|
|
pbackfail(int __c) = 0;
|
|
|
|
virtual streamsize
|
|
xsputn(const _CharT* __s, streamsize __n) = 0;
|
|
|
|
virtual streamsize
|
|
xsgetn(_CharT* __s, streamsize __n) = 0;
|
|
|
|
virtual streamoff
|
|
seekoff(streamoff __off, ios_base::seekdir __way,
|
|
ios_base::openmode __mode = ios_base::in | ios_base::out) = 0;
|
|
|
|
virtual streamoff
|
|
seekpos(streamoff __pos,
|
|
ios_base::openmode __mode = ios_base::in | ios_base::out) = 0;
|
|
|
|
virtual streambuf*
|
|
setbuf(_CharT* __b, int __len) = 0;
|
|
|
|
virtual int
|
|
sync() = 0;
|
|
|
|
virtual int
|
|
doallocate() = 0;
|
|
|
|
virtual streamsize
|
|
sys_read(_CharT* __s, streamsize __n) = 0;
|
|
|
|
virtual streamsize
|
|
sys_write(const _CharT* __s, streamsize __n) = 0;
|
|
|
|
virtual streamoff
|
|
sys_seek(streamoff __off, ios_base::seekdir __way) = 0;
|
|
|
|
virtual int
|
|
sys_close() = 0;
|
|
|
|
virtual int
|
|
sys_stat(void* __v) = 0;
|
|
|
|
virtual int
|
|
showmanyc() = 0;
|
|
|
|
virtual void
|
|
imbue(void* __v) = 0;
|
|
};
|
|
|
|
// Some of these member functions are based on libio/filebuf.cc.
|
|
// Also note that the order and number of virtual functions has to precisely
|
|
// match the order and number in the _IO_jump_t struct defined in libioP.h.
|
|
template<typename _CharT>
|
|
#ifdef _GLIBCPP_BASIC_FILE_INHERITANCE
|
|
class __basic_file: public __basic_file_base<_CharT>
|
|
#else
|
|
class __basic_file
|
|
#endif
|
|
{
|
|
#if _GLIBCPP_BASIC_FILE_ENCAPSULATION
|
|
__c_file_type* _M_cfile;
|
|
bool _M_cfile_created;
|
|
#else
|
|
# ifdef _GLIBCPP_USE_WCHAR_T
|
|
__c_wfile_type _M_wfile;
|
|
# endif
|
|
#endif
|
|
|
|
public:
|
|
__basic_file(__c_lock* __lock = 0);
|
|
|
|
void
|
|
_M_open_mode(ios_base::openmode __mode, int& __p_mode, int& __rw_mode,
|
|
char* __c_mode);
|
|
|
|
// Equivalent to the normal fopen function.
|
|
__basic_file*
|
|
open(const char* __name, ios_base::openmode __mode, int __prot = 0664);
|
|
|
|
// Used for opening the standard streams, cin, cout, cerr, clog,
|
|
// and their wide-stream equivalents. Instead of calling open, it
|
|
// just sets __c_file_type->_fileno and the respective _flags bits, and
|
|
// returns.
|
|
__basic_file*
|
|
sys_open(__c_file_type* __file, ios_base::openmode __mode);
|
|
|
|
_CharT
|
|
sys_getc();
|
|
|
|
_CharT
|
|
sys_ungetc(_CharT);
|
|
|
|
__basic_file*
|
|
close();
|
|
|
|
bool
|
|
is_open();
|
|
|
|
// NB: Must match FILE specific jump table starting here--this
|
|
// means all virtual functions starting with the dtor must match,
|
|
// slot by slot. For glibc-based dystems, this means the _IO_FILE
|
|
// as the FILE struct and _IO_jump_t as the jump table.
|
|
virtual
|
|
~__basic_file(); // Takes the place of __finish.
|
|
|
|
virtual int
|
|
overflow(int __c = EOF);
|
|
|
|
virtual int
|
|
underflow();
|
|
|
|
virtual int
|
|
uflow();
|
|
|
|
virtual int
|
|
pbackfail(int __c);
|
|
|
|
// A complex "write" function that sets all of __c_file_type's
|
|
// pointers and associated data members correctly and manages its
|
|
// relation to the external byte sequence.
|
|
virtual streamsize
|
|
xsputn(const _CharT* __s, streamsize __n);
|
|
|
|
// A complex "read" function that sets all of __c_file_type's
|
|
// pointers and associated data members correctly and manages its
|
|
// relation to the external byte sequence.
|
|
virtual streamsize
|
|
xsgetn(_CharT* __s, streamsize __n);
|
|
|
|
// A complex "seekoff" function that sets all of __c_file_type's
|
|
// pointers and associated data members correctly and manages its
|
|
// relation to the external byte sequence.
|
|
virtual streamoff
|
|
seekoff(streamoff __off, ios_base::seekdir __way,
|
|
ios_base::openmode __mode = ios_base::in | ios_base::out);
|
|
|
|
// A complex "seekpos" function that sets all of __c_file_type's
|
|
// pointers and associated data members correctly and manages its
|
|
// relation to the external byte sequence.
|
|
virtual streamoff
|
|
seekpos(streamoff __pos,
|
|
ios_base::openmode __mode = ios_base::in | ios_base::out);
|
|
|
|
virtual streambuf*
|
|
setbuf(_CharT* __b, int __len);
|
|
|
|
virtual int
|
|
sync();
|
|
|
|
virtual int
|
|
doallocate();
|
|
|
|
// A simple read function for the external byte sequence, that
|
|
// does no mucking around with or setting of the pointers or flags
|
|
// in __c_file_type.
|
|
virtual streamsize
|
|
sys_read(_CharT* __s, streamsize __n);
|
|
|
|
// A simple write function for the external byte sequence, that
|
|
// does no mucking around with or setting of the pointers or flags
|
|
// in __c_file_type.
|
|
virtual streamsize
|
|
sys_write(const _CharT* __s, streamsize __n);
|
|
|
|
// A simple seek function for the external byte sequence, that
|
|
// does no mucking around with or setting of the pointers or flags
|
|
// in __c_file_type.
|
|
virtual streamoff
|
|
sys_seek(streamoff __off, ios_base::seekdir __way);
|
|
|
|
virtual int
|
|
sys_close();
|
|
|
|
virtual int
|
|
sys_stat(void* __v);
|
|
|
|
virtual int
|
|
showmanyc();
|
|
|
|
virtual void
|
|
imbue(void* __v);
|
|
};
|
|
} // namespace std
|
|
|
|
// Now include the bits that are dependant on the underlying I/O
|
|
// model chosen at configure time.
|
|
#include <bits/basic_file_model.h>
|
|
|
|
#endif // _CPP_BASIC_FILE
|