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/*

 *  ftruncate() - Truncate a File to the Specified Length

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  ftruncate.c,v 1.9 2002/01/04 18:29:36 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <unistd.h>

#include <errno.h>

#include <rtems/libio_.h>

#include <rtems/seterr.h>

int ftruncate(

  int     fd,

  off_t   length

)

{

  rtems_libio_t                    *iop;

  rtems_filesystem_location_info_t  loc;

  rtems_libio_check_fd( fd );

  iop = rtems_libio_iop( fd );

  rtems_libio_check_is_open(iop);

  /*

   *  Now process the ftruncate() request.

   */

  /*

   *  Make sure we are not working on a directory

   */

  loc = iop->pathinfo;

  if ( !loc.ops->node_type_h )

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  if ( (*loc.ops->node_type_h)( &loc ) == RTEMS_FILESYSTEM_DIRECTORY )

    rtems_set_errno_and_return_minus_one( EISDIR );

  rtems_libio_check_permissions( iop, LIBIO_FLAGS_WRITE );

  if ( !iop->handlers->ftruncate_h )

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  return (*iop->handlers->ftruncate_h)( iop, length );

}