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/*

 *  readlink() - POSIX 1003.1b - X.X.X - XXX

 *

 *  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.

 *

 *  readlink.c,v 1.8 2002/01/04 18:29:36 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <rtems/libio_.h>

#include <rtems/seterr.h>

int readlink(

  const char *pathname,

  char       *buf,

  int         bufsize

)

{

  rtems_filesystem_location_info_t  loc;

  int                               result;

  if (!buf)

    rtems_set_errno_and_return_minus_one( EFAULT );

  result = rtems_filesystem_evaluate_path( pathname, 0, &loc, FALSE );

  if ( result != 0 )

     return -1;

  if ( !loc.ops->node_type_h ){

    rtems_filesystem_freenode( &loc );

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  }

  if (  (*loc.ops->node_type_h)( &loc ) != RTEMS_FILESYSTEM_SYM_LINK ){

    rtems_filesystem_freenode( &loc );

    rtems_set_errno_and_return_minus_one( EINVAL );

  }

  if ( !loc.ops->readlink_h ){

    rtems_filesystem_freenode( &loc );

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  }

  result =  (*loc.ops->readlink_h)( &loc, buf, bufsize );

  rtems_filesystem_freenode( &loc );

  return result;

}