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/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2006 Altera Corporation, San Jose, California, USA.           *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

* Altera does not recommend, suggest or require that this reference design    *

* file be used in conjunction or combination with any other product.          *

******************************************************************************/

#include <stddef.h>

#include <sys/stat.h>

#include "sys/alt_dev.h"

#include "sys/alt_warning.h"

#include "sys/alt_errno.h"

#include "priv/alt_file.h"

#include "os/alt_syscall.h"

/*

 * The fstat() system call is used to obtain information about the capabilities

 * of an open file descriptor. By default file descriptors are marked as

 * being character devices. If a device or file system wishes to advertise

 * alternative capabilities then they can register an fstat() function within

 * their associated alt_dev structure. This will be called to fill in the

 * entries in the imput "st" structure.

 *

 * This function is provided for compatability with newlib.

 *

 * ALT_FSTAT is mapped onto the fstat() system call in alt_syscall.h

 */

#ifdef ALT_USE_DIRECT_DRIVERS

#include "system.h"

/*

 * Provide minimal version that just describes all file descriptors

 * as character devices for provided stdio devices.

 */

int ALT_FSTAT (int file, struct stat *st)

{

    switch (file) {

#ifdef ALT_STDIN_PRESENT

    case 0: /* stdin file descriptor */

#endif /* ALT_STDIN_PRESENT */

#ifdef ALT_STDOUT_PRESENT

    case 1: /* stdout file descriptor */

#endif /* ALT_STDOUT_PRESENT */

#ifdef ALT_STDERR_PRESENT

    case 2: /* stderr file descriptor */

#endif /* ALT_STDERR_PRESENT */

        st->st_mode = _IFCHR;

        return 0;

    default:

        return -1;

    }

#if !defined(ALT_STDIN_PRESENT) && !defined(ALT_STDOUT_PRESENT) && !defined(ALT_STDERR_PRESENT)

    /* Generate a link time warning, should this function ever be called. */

    ALT_STUB_WARNING(fstat);

#endif

}

#else /* !ALT_USE_DIRECT_DRIVERS */

int ALT_FSTAT (int file, struct stat *st)

{

  alt_fd*  fd;

  /*

   * A common error case is that when the file descriptor was created, the call

   * to open() failed resulting in a negative file descriptor. This is trapped

   * below so that we don't try and process an invalid file descriptor.

   */

  fd = (file < 0) ? NULL : &alt_fd_list[file];

  if (fd)

  {

    /* Call the drivers fstat() function to fill out the "st" structure. */

    if (fd->dev->fstat)

    {

      return fd->dev->fstat(fd, st);

    }

    /*

     * If no function is provided, mark the fd as belonging to a character

     * device.

     */

    else

    {

      st->st_mode = _IFCHR;

      return 0;

    }

  }

  else

  {

    ALT_ERRNO = EBADFD;

    return -1;

  }

}

#endif /* ALT_USE_DIRECT_DRIVERS */