upload sdk

git-svn-id: svn://kolibrios.org@4349 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/math/sf_isinf.c

@@ -0,0 +1,37 @@
+/*
+ * isinff(x) returns 1 if x is +-infinity, else 0;
+ *
+ * isinf is a <math.h> macro in the C99 standard.  It was previously
+ * implemented as isinf and isinff functions by newlib and are still declared
+ * as such in <ieeefp.h>.  Newlib supplies it here as a function if the user
+ * chooses to use <ieeefp.h> or needs to link older code compiled with the
+ * previous <math.h> declaration.
+ */
+
+#include "fdlibm.h"
+#include <ieeefp.h>
+
+#undef isinff
+
+int
+_DEFUN (isinff, (x),
+	float x)
+{
+	__int32_t ix;
+	GET_FLOAT_WORD(ix,x);
+	ix &= 0x7fffffff;
+	return FLT_UWORD_IS_INFINITE(ix);
+}
+
+#ifdef _DOUBLE_IS_32BITS
+
+#undef isinf
+
+int
+_DEFUN (isinf, (x),
+	double x)
+{
+	return isinff((float) x);
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */