From d7be1cb13eb46f173d994d2f9d71b70e89087f1f Mon Sep 17 00:00:00 2001
From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Sat, 15 Mar 2008 10:32:10 +0000
Subject: [PATCH] reat nan as FALSE in an IF CDEF

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1305 a5681a0c-68f1-0310-ab6d-d61299d08faa
---
 src/rrd_rpncalc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/rrd_rpncalc.c b/src/rrd_rpncalc.c
index 839643b..1f86f2e 100644
--- a/src/rrd_rpncalc.c
+++ b/src/rrd_rpncalc.c
@@ -705,8 +705,8 @@ short rpn_calc(
             break;
         case OP_IF:
             stackunderflow(2);
-            rpnstack->s[stptr - 2] = rpnstack->s[stptr - 2] != 0.0 ?
-                rpnstack->s[stptr - 1] : rpnstack->s[stptr];
+            rpnstack->s[stptr - 2] = ( isnan(rpnstack->s[stptr - 2]) || rpnstack->s[stptr - 2] == 0.0 ) ?
+                rpnstack->s[stptr] : rpnstack->s[stptr - 1];
             stptr--;
             stptr--;
             break;
-- 
2.30.2