add fdlibm

git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@557 b9cfdab3-6d41-4d17-bbe4-086880011989

external/fdlibm/s_ldexp.c

@@ -0,0 +1,22 @@
+
+/* @(#)s_ldexp.c 1.3 95/01/18 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunSoft, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+#include "math.h"
+#include <errno.h>
+
+double ldexp(double value, int exp) {
+	if(!finite(value) || value == 0.0) return value;
+	value = scalbn(value, exp);
+	if(!finite(value) || value == 0.0) errno = ERANGE;
+	return value;
+}