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luatz/timetable: Fix incorrect math for negative carry operations
[etc/awesome.git] / luatz / timetable.lua
diff --git a/luatz/timetable.lua b/luatz/timetable.lua
index e2930d8dcc287cdaef8aeb92aab6272cffc5c52e..0dbf4c8eedb5d6fdce95d0f80187ef08e1363de0 100644 (file)
--- a/luatz/timetable.lua
+++ b/luatz/timetable.lua
@@ -76,8 +76,8 @@ local function carry ( tens , units , base )
                tens  = tens + idiv ( units , base )
                units = units % base
        elseif units < 0 then
-               tens  = tens - 1 + idiv ( -units , base )
-               units = base - ( -units % base )
+               tens  = tens + idiv ( units , base )
+               units = ( base + units ) % base
        end
        return tens , units
 end
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