From: Tobias Oetiker <tobi@oetiker.ch>
Date: Sat, 10 Nov 2012 16:46:44 +0000 (+0100)
Subject: fix trendnan variable access
X-Git-Tag: 1.4.8~19
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8381c9b92283b576929a7317f982a23d0b3254f3;p=thirdparty%2Frrdtool-1.x.git

fix trendnan variable access
---

diff --git a/src/rrd_rpncalc.c b/src/rrd_rpncalc.c
index b3d77601..78127d59 100644
--- a/src/rrd_rpncalc.c
+++ b/src/rrd_rpncalc.c
@@ -886,7 +886,9 @@ short rpn_calc(
                 if (output_idx + 1 >= (int) ceil((float) dur / (float) step)) {
                     int       ignorenan = (rpnp[rpi].op == OP_TREND);
                     double    accum = 0.0;
-                    int       i = 0;
+                    int       i = -1; /* pick the current entries, not the next one
+                                         as the data pointer has already been forwarded
+                                         when the OP_VARIABLE was processed */
                     int       count = 0;
 
                     do {