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[/] [openrisc/] [trunk/] [or1ksim/] [peripheral/] [channels/] [file.c] - Blame information for rev 524

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Line No. Rev Author Line
1 19 jeremybenn
/* file.c -- Definition of functions and structures for
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   peripheral to communicate with host through files
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   Copyright (C) 2002 Richard Prescott <rip@step.polymtl.ca>
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   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org
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   Copyright (C) 2008 Embecosm Limited
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   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
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   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.
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   This program is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by the Free
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   Software Foundation; either version 3 of the License, or (at your option)
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   any later version.
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   This program is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   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 program.  If not, see <http://www.gnu.org/licenses/>.  */
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/* This program is commented throughout in a fashion suitable for processing
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   with Doxygen. */
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/* Autoconf and/or portability configuration */
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#include "config.h"
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#include "port.h"
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/* System includes */
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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/* Package includes */
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#include "channel.h"
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#include "fd.h"
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/*! Data structure representing a channel to/from a file */
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struct file_channel
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{
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  struct fd_channel  fds;
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  char              *namein;
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  char              *nameout;
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};
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/* Forward declarations of static routines */
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static void *file_init (const char *args);
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static int   file_open (void *data);
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static void  file_close (void *data);
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static void  file_free (void *data);
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/*! Data structure with all the operations for communicating with a file
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    channel */
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struct channel_ops  file_channel_ops = {
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        .init  = file_init,
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        .open  = file_open,
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        .close = file_close,
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        .read  = fd_read,
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        .write = fd_write,
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        .free  = file_free,
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};
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static void *
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file_init (const char *args)
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{
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  struct file_channel *retval;
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  char *nameout;
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  if (!args)
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    {
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      errno = EINVAL;
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      return NULL;
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    }
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  retval = (struct file_channel *) calloc (1, sizeof (struct file_channel));
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  if (!retval)
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    {
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      return NULL;
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    }
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  retval->fds.fdin = -1;
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  retval->fds.fdout = -1;
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  nameout = strchr (args, ',');
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  if (nameout)
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    {
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      retval->namein = strndup (args, nameout - args);
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      retval->nameout = strdup (nameout + 1);
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    }
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  else
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    {
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      retval->nameout = retval->namein = strdup (args);
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    }
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  return (void *) retval;
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}
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static int
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file_open (void *data)
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{
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  struct file_channel *files = (struct file_channel *) data;
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  if (!files)
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    {
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      errno = ENODEV;
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      return -1;
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    }
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  if (files->namein == files->nameout)
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    {
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      /* if we have the same name in and out
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       * it cannot (logically) be a regular files.
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       * so we wont create one
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       */
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      files->fds.fdin = files->fds.fdout = open (files->namein, O_RDWR);
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      return files->fds.fdin < 0 ? -1 : 0;
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    }
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  files->fds.fdin = open (files->namein, O_RDONLY | O_CREAT, 0664);
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  if (files->fds.fdin < 0)
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    return -1;
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  files->fds.fdout = open (files->nameout, O_WRONLY | O_CREAT, 0664);
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  if (files->fds.fdout < 0)
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    {
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      close (files->fds.fdout);
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      files->fds.fdout = -1;
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      return -1;
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    }
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  return 0;
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}
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static void
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file_close (void *data)
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{
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  struct file_channel *files = (struct file_channel *) data;
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  if (files->fds.fdin != files->fds.fdout)
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    close (files->fds.fdin);
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  close (files->fds.fdout);
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  files->fds.fdin = -1;
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  files->fds.fdout = -1;
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}
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static void
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file_free (void *data)
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{
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  struct file_channel *files = (struct file_channel *) data;
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  if (files->namein != files->nameout)
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    free (files->namein);
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  free (files->nameout);
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  free (files);
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}

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