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Have _heapmaxavail() work as advertised.

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The cc65 doc explicitly states that the return value of _heapmaxavail() can be used as parameter of malloc(). To actually allow for that the size of HEAP_ADMIN_SPACE has to be substracted from the raw size of the largest free heap block.
This commit is contained in:
Oliver Schmidt 2014-02-20 21:03:52 +01:00
parent 4b085f193e
commit d001a6f1a0
1 changed files with 11 additions and 2 deletions
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13
libsrc/common/_heapmaxavail.s
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@ -61,7 +61,7 @@ __heapmaxavail:
; F = F->next; ; F = F->next;
@L2: iny ; Points to F->next @L2: iny ; Points to F->next
lda (ptr1),y lda (ptr1),y
tax tax
iny iny
@ -69,8 +69,17 @@ __heapmaxavail:
stx ptr1 stx ptr1
jmp @L1 jmp @L1
; return Size; ; if (Size < HEAP_ADMIN_SPACE) return 0;
@L3: lda ptr2 @L3: lda ptr2
sub #HEAP_ADMIN_SPACE
ldx ptr2+1 ldx ptr2+1
bcs @L5
bne @L4
txa
rts rts
; return Size - HEAP_ADMIN_SPACE;
@L4: dex
@L5: rts