call fpclass only once when replacing isnan for solaris

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1904 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/src/rrd_config_bottom.h b/src/rrd_config_bottom.h
index d04e592..a569197 100644 (file)
--- a/src/rrd_config_bottom.h
+++ b/src/rrd_config_bottom.h
@@ -175,7 +175,8 @@ char *strchr (), *strrchr ();
 #  ifdef isinf
 #  undef isinf
 #  endif
-#  define isinf(a) (fpclass(a) == FP_NINF || fpclass(a) == FP_PINF)
+#  define isinf(a) (!!(fpclass(a) & (FP_SNAN|FP_QNAN)))
+
 #endif
 
 /* solaris 10 it defines isnan such that only forte can compile it ... bad bad  */