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52 lines
938 B
ArmAsm
52 lines
938 B
ArmAsm
;
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; Ullrich von Bassewitz, 2004-07-17
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;
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; size_t __fastcall__ _heapblocksize (const void* ptr);
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;
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; Return the size of an allocated block.
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;
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.importzp ptr1
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.export __heapblocksize
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.include "_heap.inc"
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.macpack generic
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.macpack cpu
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;-----------------------------------------------------------------------------
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; Code
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__heapblocksize:
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; Decrement the block pointer so it points to the admin data
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sub #HEAP_ADMIN_SPACE ; Assume it's less than 256
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bcs L1
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dex
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L1: sta ptr1
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stx ptr1+1
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; Load the size from the given block
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ldy #1
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lda (ptr1),y
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tax
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.if (.cpu .bitand CPU_ISET_65SC02)
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lda (ptr1)
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.else
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dey
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lda (ptr1),y
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.endif
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; Adjust it to the user visible size
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sub #HEAP_ADMIN_SPACE
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bcs L9
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dex
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; Done
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L9: rts
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