reference: check for unset leap_when in is_leap_close()

Check that the leap_when variable is set before testing a timestamp for
being close to a leap second. This allows the first measurement to be
accepted if starting at the Unix epoch (e.g. in a test).

diff --git a/reference.c b/reference.c
index bf30991613c90caf210914771fc8edf77dc46a18..903232305acbc44c811fbbf8cacdaecc55705fea 100644 (file)
--- a/reference.c
+++ b/reference.c
@@ -1333,7 +1333,8 @@ REF_DisableLocal(void)
 static int
 is_leap_close(time_t t)
 {
-  return t >= leap_when - LEAP_SECOND_CLOSE && t < leap_when + LEAP_SECOND_CLOSE;
+  return leap_when != 0 &&
+         t >= leap_when - LEAP_SECOND_CLOSE && t < leap_when + LEAP_SECOND_CLOSE;
 }
 
 /* ================================================== */