#include "rrd_nan_inf.h"
-#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
+int done_nan = 0;
+int done_inf = 0;
+
+double dnan;
+double dinf;
+#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
#include <math.h>
-double set_to_DNAN(void) { return (double)fmod(0.0,0.0); }
-double set_to_DINF(void) { return (double)fabs((double)log(0.0)); }
+#define NAN_FUNC (double)fmod(0.0,0.0)
+#define INF_FUNC (double)fabs((double)log(0.0))
#else
-double set_to_DNAN(void) { return (double)(0.0/0.0); }
-double set_to_DINF(void) { return (double)(1.0/0.0); }
+#define NAN_FUNC (double)(0.0/0.0)
+#define INF_FUNC (double)(1.0/0.0)
#endif
+
+double set_to_DNAN(void)
+{
+ if ( !done_nan ) { dnan = NAN_FUNC; done_nan = 1; }
+ return dnan;
+}
+
+double set_to_DINF(void)
+{
+ if ( !done_inf ) { dinf = INF_FUNC; done_inf = 1; }
+ return dinf;
+}