Fix Windows build, again.

core/logic/smn_float.cpp

@@ -35,6 +35,7 @@
 #include "common_logic.h"
 #include "MersenneTwister.h"
 #include <IPluginSys.h>
+#include <am-utility.h>
 
 /****************************************
 *                                       *
@@ -119,7 +120,7 @@ static cell_t sm_FloatNe(IPluginContext *pCtx, const cell_t *params)
 static cell_t sm_FloatNot(IPluginContext *pCtx, const cell_t *params)
 {
 	float val = sp_ctof(params[1]);
-	if (isnan(val))
+	if (ke::IsNaN(val))
 		return 1;
 	return val ? 0 : 1;
 }

core/sm_stringutil.cpp

@@ -33,12 +33,12 @@
 #include <ctype.h>
 #include <stdarg.h>
 #include <ITextParsers.h>
-#include <float.h>
 #include "sm_stringutil.h"
 #include "Logger.h"
 #include "PlayerManager.h"
 #include "logic_bridge.h"
 #include "sourcemod.h"
+#include <am-utility.h>
 
 #define LADJUST			0x00000004		/* left adjustment */
 #define ZEROPAD			0x00000080		/* zero (as opposed to blank) pad */
@@ -214,7 +214,8 @@ void AddFloat(char **buf_p, size_t &maxlen, double fval, int width, int prec, in
 	int significant_digits = 0;	// number of significant digits written
 	const int MAX_SIGNIFICANT_DIGITS = 16;
 
-	if (isnan(fval)) {
+	if (ke::IsNaN(fval))
+	{
 		AddString(buf_p, maxlen, "NaN", width, prec);
 		return;
 	}

public/amtl/am-utility.h

@@ -34,6 +34,8 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdint.h>
+#include <math.h>
+#include <float.h>
 #if defined(_MSC_VER)
 # include <intrin.h>
 #endif
@@ -218,6 +220,16 @@ FindRightmostBit(size_t number)
 #endif
 }
 
+static inline bool
+IsNaN(double v)
+{
+#ifdef _MSC_VER
+  return _isnan(v);
+#else
+  return isnan(v);
+#endif
+}
+
 static inline bool
 IsPowerOfTwo(size_t value)
 {