Fix CanCastAsInteger if errno is set.

This method checks if the range of the input variable is fine.

However if the errno variable was already set, it fails even for valid inputs.

This fixes at least some random failures in the python castmode.

Fixes: #2519

1 files changed, 5 insertions, 3 deletions

diff --git a/Lib/typemaps/primtypes.swg b/Lib/typemaps/primtypes.swg
index dd80eb775..85a0b8d9b 100644
--- a/Lib/typemaps/primtypes.swg
+++ b/Lib/typemaps/primtypes.swg
@@ -252,9 +252,11 @@ SWIGINTERNINLINE int
 SWIG_CanCastAsInteger(double *d, double min, double max) {
   double x = *d;
   if ((min <= x && x <= max)) {
-   double fx = floor(x);
-   double cx = ceil(x);
-   double rd =  ((x - fx) < 0.5) ? fx : cx; /* simple rint */
+   double fx, cx, rd;
+   errno = 0;
+   fx = floor(x);
+   cx = ceil(x);
+   rd =  ((x - fx) < 0.5) ? fx : cx; /* simple rint */
    if ((errno == EDOM) || (errno == ERANGE)) {
      errno = 0;
    } else {