Fix json output when printing infinity values

The printf of a rrd_value_t variable can output inf in case of an
infinity value. That inf value is not JSON valid, nor are Infinity,
NaN, Number.NEGATIVE_INFINITY or Number.POSITIVE_INFINITY.

This commit adds a test for infinity values by using isinf() and
outputs a null in such case.

diff --git a/src/rrd_tool.c b/src/rrd_tool.c
index 57e22ce0d6c1278985d0e0630ca73946d3b3d39e..3002d383795bee0be8b047f37a1ad3403251fb28 100644 (file)
--- a/src/rrd_tool.c
+++ b/src/rrd_tool.c
@@ -804,7 +804,7 @@ int HandleInputLine(
                     rrd_value_t newval = DNAN;
                     newval = *ptr;
                     if (json){
-                        if (isnan(newval)){
+                        if (isnan(newval) || isinf(newval)){
                             printf("null");                        
                         } else {
                             printf("%0.10e",newval);