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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [score/] [src/] [heapsizeofuserarea.c] - Blame information for rev 846

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Line No. Rev Author Line
1 30 unneback
/*
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 *  Heap Handler
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: heapsizeofuserarea.c,v 1.2 2001-09-27 11:59:34 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/score/sysstate.h>
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#include <rtems/score/heap.h>
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/*PAGE
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 *
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 *  _Heap_Size_of_user_area
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 *
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 *  This kernel routine returns the size of the memory area
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 *  given heap block.
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 *
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 *  Input parameters:
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 *    the_heap         - pointer to heap header
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 *    starting_address - starting address of the memory block to free.
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 *    size             - pointer to size of area
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 *
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 *  Output parameters:
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 *    size  - size of area filled in
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 *    TRUE  - if starting_address is valid heap address
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 *    FALSE - if starting_address is invalid heap address
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 */
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boolean _Heap_Size_of_user_area(
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  Heap_Control        *the_heap,
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  void                *starting_address,
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  unsigned32          *size
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)
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{
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  Heap_Block        *the_block;
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  Heap_Block        *next_block;
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  unsigned32         the_size;
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  the_block = _Heap_User_block_at( starting_address );
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  if ( !_Heap_Is_block_in( the_heap, the_block ) ||
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        _Heap_Is_block_free( the_block ) )
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    return( FALSE );
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  the_size   = _Heap_Block_size( the_block );
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  next_block = _Heap_Block_at( the_block, the_size );
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  if ( !_Heap_Is_block_in( the_heap, next_block ) ||
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       (the_block->front_flag != next_block->back_flag) )
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    return( FALSE );
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  *size = the_size;
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  return( TRUE );
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}
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