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-rw-r--r--json-c/src/math_compat.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/json-c/src/math_compat.h b/json-c/src/math_compat.h
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index 0000000..6506bd9
--- /dev/null
+++ b/json-c/src/math_compat.h
@@ -0,0 +1,31 @@
+#ifndef __math_compat_h
+#define __math_compat_h
+
+/* Define isnan, isinf, infinity and nan on Windows/MSVC */
+
+#ifndef HAVE_DECL_ISNAN
+# ifdef HAVE_DECL__ISNAN
+#include <float.h>
+#define isnan(x) _isnan(x)
+# endif
+#endif
+
+#ifndef HAVE_DECL_ISINF
+# ifdef HAVE_DECL__FINITE
+#include <float.h>
+#define isinf(x) (!_finite(x))
+# endif
+#endif
+
+#ifndef HAVE_DECL_INFINITY
+#include <float.h>
+#define INFINITY (DBL_MAX + DBL_MAX)
+#define HAVE_DECL_INFINITY
+#endif
+
+#ifndef HAVE_DECL_NAN
+#define NAN (INFINITY - INFINITY)
+#define HAVE_DECL_NAN
+#endif
+
+#endif