Handle NaN / +Inf / -Inf in range evaluation (fixes #606).

1 files changed, 9 insertions, 1 deletions

diff --git a/src/value.cc b/src/value.cc
index c8a88c6..3a6540f 100644
--- a/src/value.cc
+++ b/src/value.cc
@@ -39,6 +39,10 @@
 /*Unicode support for string lengths and array accesses*/
 #include <glib.h>
 
+#include <boost/math/special_functions/fpclassify.hpp>
+using boost::math::isnan;
+using boost::math::isinf;
+
 std::ostream &operator<<(std::ostream &stream, const Filename &filename)
 {
   fs::path fnpath = fs::path( (std::string)filename );
@@ -642,7 +646,11 @@ void Value::RangeType::normalize() {
 }
 
 uint32_t Value::RangeType::nbsteps() const {
-  if (begin_val == end_val) {
+  if (isnan(step_val) || isinf(begin_val) || (isinf(end_val))) {
+    return std::numeric_limits<uint32_t>::max();
+  }
+
+  if ((begin_val == end_val) || isinf(step_val)) {
     return 0;
   }