lib/realtime: fix `Timespec::-`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/realtime.nit b/lib/realtime.nit
index 523f63e..39c5a27 100644 (file)
--- a/lib/realtime.nit
+++ b/lib/realtime.nit
@@ -73,13 +73,16 @@ extern class Timespec `{struct timespec*`}
                clock_gettime(CLOCK_MONOTONIC, self);
        `}
 
-       # Substract a Timespec from `self`.
-       fun - ( o : Timespec ) : Timespec
+       # Subtract `other` from `self`
+       fun -(other: Timespec): Timespec
        do
-               var s = sec - o.sec
-               var ns = nanosec - o.nanosec
-               if ns > nanosec then s += 1
-               return new Timespec( s, ns )
+               var s = sec - other.sec
+               var ns = nanosec - other.nanosec
+               if ns < 0 then
+                       s -= 1
+                       ns += 1000000000
+               end
+               return new Timespec(s, ns)
        end
 
        # Number of whole seconds of elapsed time.