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//==========================================================================
//
// io/common/io_file.c
//
// High-level file I/O support.
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 2000-01-10
// Purpose:
// Description:
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
// File I/O support
#include <pkgconf/io.h>
#include <cyg/io/file.h>
#include <cyg/error/codes.h>
struct file fds[CYGPKG_IO_NFILE];
//
// This function allcates a file "slot".
//
int
falloc(struct file **fp, int *fd)
{
int i;
struct file *f;
f = &fds[0];
for (i = 0; i < CYGPKG_IO_NFILE; i++, f++) {
if (f->f_flag == 0) {
f->f_flag = FALLOC;
*fp = f;
*fd = i;
return 0;
}
}
return EMFILE; // No more files
}
//
// This function is used to return a file slot.
//
void
ffree(struct file *fp)
{
fp->f_flag = 0; // Mark free
}
//
// This function provides the mapping from a file descriptor (small
// integer used by application code) to the corresponding file slot.
cyg_bool
getfp(int fd, struct file **fp)
{
struct file *f;
if (fd >= CYGPKG_IO_NFILE)
return -1;
f = &fds[fd];
if (f->f_flag == 0)
return -1;
*fp = f;
return 0;
}
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