fstream.cpp

vxworks源码源码解读是学习vxworks的最佳途径

/* This has been copied from the gnu source tree */
/* Make all changes there, not here! */
#ifdef __cplusplus
extern "C" {
#endif
#ifndef _N_
char __fstream_o = 0;
#else
char _N_ = 0;
#endif
#ifdef __cplusplus
}
#endif
#include "vxWorks.h"
/* This is part of libio/iostream, providing -*- C++ -*- input/output.
Copyright (C) 1993 Free Software Foundation

This file is part of the GNU IO 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, if you link this library with files
compiled with a GNU compiler to produce an executable, this does not 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.

Written by Per Bothner ([e-mail]). */

#ifdef __GNUG__
#pragma implementation
#endif
#define _STREAM_COMPAT
extern "C" {
#include "libioP.h"
}
#include <fstream.h>

inline void
fstreambase::__fb_init()
{
#ifdef _IO_NEW_STREAMS
#if !_IO_UNIFIED_JUMPTABLES
  /* Uses the _IO_file_jump jumptable, for eficiency. */
  __my_fb._jumps = &_IO_file_jumps;
  __my_fb._vtable() = builtinbuf_vtable;
#endif
  init (&__my_fb);
#else
  init(filebuf::__new());
  _flags &= ~ios::dont_close;
#endif
}

fstreambase::fstreambase()
{
  __fb_init ();
}

fstreambase::fstreambase(int fd)
{
  __fb_init ();
  _IO_file_attach(rdbuf(), fd);
}

fstreambase::fstreambase(const char *name, int mode, int prot)
{
  __fb_init ();
  if (!rdbuf()->open(name, mode, prot))
    set(ios::badbit);
}

fstreambase::fstreambase(int fd, char *p, int l)
{
#ifdef _IO_NEW_STREAMS
  __fb_init ();
#else
  init(filebuf::__new());
#endif
  _IO_file_attach(rdbuf(), fd);
  _IO_file_setbuf(rdbuf(), p, l);
}

void fstreambase::open(const char *name, int mode, int prot)
{
    clear();
    if (!rdbuf()->open(name, mode, prot))
	set(ios::badbit);
}

void fstreambase::close()
{
    if (!rdbuf()->close())
	set(ios::failbit);
}

void fstreambase::attach(int fd)
{
  if (!rdbuf()->attach(fd))
    set(ios::failbit);
}

#if 0
static int mode_to_sys(enum open_mode mode)
{
    return O_WRONLY;
}

static char* fopen_cmd_arg(io_mode i)
{
    return "w";
}
#endif