[test] Add cairo_test_NaN and use it in place of strtod

strtod("NaN") returns 0.0 with the MSVC runtime so we
need to generate NaN some other way.

1 files changed, 15 insertions, 0 deletions

diff --git a/test/cairo-test.h b/test/cairo-test.h
index ac8856b3a..5a5be44ea 100644
--- a/test/cairo-test.h
+++ b/test/cairo-test.h
@@ -64,6 +64,21 @@ typedef unsigned __int64 uint64_t;
 
 #include <math.h>
 
+static inline double
+cairo_test_NaN (void)
+{
+#ifdef _MSC_VER
+    /* MSVC strtod("NaN", NULL) returns 0.0 */
+    union {
+	uint32_t i[2];
+	double d;
+    } nan = {{0xffffffff, 0x7fffffff}};
+    return nan.d;
+#else
+    return strtod("NaN", NULL);
+#endif
+}
+
 typedef enum cairo_test_status {
     CAIRO_TEST_SUCCESS = 0,
     CAIRO_TEST_NO_MEMORY,