1 | /* |
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2 | * Heap Handler |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | |
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15 | #include <rtems/system.h> |
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16 | #include <rtems/score/sysstate.h> |
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17 | #include <rtems/score/heap.h> |
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18 | |
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19 | /*PAGE |
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20 | * |
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21 | * _Heap_Size_of_user_area |
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22 | * |
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23 | * This kernel routine returns the size of the memory area |
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24 | * given heap block. |
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25 | * |
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26 | * Input parameters: |
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27 | * the_heap - pointer to heap header |
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28 | * starting_address - starting address of the memory block to free. |
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29 | * size - pointer to size of area |
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30 | * |
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31 | * Output parameters: |
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32 | * size - size of area filled in |
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33 | * TRUE - if starting_address is valid heap address |
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34 | * FALSE - if starting_address is invalid heap address |
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35 | */ |
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36 | |
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37 | boolean _Heap_Size_of_user_area( |
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38 | Heap_Control *the_heap, |
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39 | void *starting_address, |
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40 | uint32_t *size |
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41 | ) |
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42 | { |
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43 | Heap_Block *the_block; |
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44 | Heap_Block *next_block; |
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45 | uint32_t the_size; |
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46 | |
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47 | if ( !_Addresses_Is_in_range( |
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48 | starting_address, (void *)the_heap->start, (void *)the_heap->final ) ) |
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49 | return( FALSE ); |
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50 | |
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51 | the_block = _Heap_User_block_at( starting_address ); |
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52 | |
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53 | if ( !_Heap_Is_block_in( the_heap, the_block ) ) |
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54 | return( FALSE ); |
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55 | |
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56 | if ( _Heap_Is_block_free( the_block ) ) |
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57 | return( FALSE ); |
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58 | |
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59 | the_size = _Heap_Block_size( the_block ); |
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60 | next_block = _Heap_Block_at( the_block, the_size ); |
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61 | |
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62 | if ( !_Heap_Is_block_in( the_heap, next_block ) || |
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63 | (the_block->front_flag != next_block->back_flag) ) |
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64 | return( FALSE ); |
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65 | |
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66 | *size = the_size; |
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67 | return( TRUE ); |
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68 | } |
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69 | |
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