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/*

 *  Heap Handler

 *

 *  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.

 *

 *  $Id: heapsizeofuserarea.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/sysstate.h>

#include <rtems/score/heap.h>

/*PAGE

 *

 *  _Heap_Size_of_user_area

 *

 *  This kernel routine returns the size of the memory area

 *  given heap block.

 *

 *  Input parameters:

 *    the_heap         - pointer to heap header

 *    starting_address - starting address of the memory block to free.

 *    size             - pointer to size of area

 *

 *  Output parameters:

 *    size  - size of area filled in

 *    TRUE  - if starting_address is valid heap address

 *    FALSE - if starting_address is invalid heap address

 */

boolean _Heap_Size_of_user_area(

  Heap_Control        *the_heap,

  void                *starting_address,

  unsigned32          *size

)

{

  Heap_Block        *the_block;

  Heap_Block        *next_block;

  unsigned32         the_size;

  the_block = _Heap_User_block_at( starting_address );

  if ( !_Heap_Is_block_in( the_heap, the_block ) ||

        _Heap_Is_block_free( the_block ) )

    return( FALSE );

  the_size   = _Heap_Block_size( the_block );

  next_block = _Heap_Block_at( the_block, the_size );

  if ( !_Heap_Is_block_in( the_heap, next_block ) ||

       (the_block->front_flag != next_block->back_flag) )

    return( FALSE );

  *size = the_size;

  return( TRUE );

}