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ORCALib
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In qsort, make sure to do nothing if count is 0. 

Previously, it could behave incorrectly in some cases where count was 0. This would happen if the address calculation &base[-1] wrapped around and produced a large number, either because base was NULL or because size was larger than the address of base.

This fixes #33.
This commit is contained in:
Stephen Heumann 2021-02-25 22:52:34 -06:00
parent 9af245933c
commit 7e95f8b182
1 changed files with 4 additions and 1 deletions
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5
stdlib.asm
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@ -663,6 +663,9 @@ qsort start
phk phk
plb plb
lda count nothing to do if count is 0
ora count+2
beq done
dec4 count set count to the addr of the last entry dec4 count set count to the addr of the last entry
mul4 count,size mul4 count,size
add4 count,base add4 count,base
@ -677,7 +680,7 @@ qsort start
ph4 base ph4 base
jsl rsort jsl rsort
plb done plb
creturn creturn
end end