math: add exception handling functionality

According to standards SVID and SYSV.
Modified lgamma calling in case when 'signgam' variable should not be used.

Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/libm/w_hypot.c b/libm/w_hypot.c
new file mode 100644
index 000000000..e547bfd4d
--- /dev/null
+++ b/libm/w_hypot.c
@@ -0,0 +1,34 @@
+/* @(#)w_hypot.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * wrapper hypot(x,y)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+double
+hypot (double x, double y)
+{
+#if __UCLIBC_HAS_FENV__
+	double z = __ieee754_hypot(x,y);
+	if(__builtin_expect(!isfinite(z), 0)
+	   && isfinite(x) && isfinite(y) && _LIB_VERSION != _IEEE_)
+	    return __kernel_standard(x, y, 4); /* hypot overflow */
+
+	return z;
+#else
+	return __ieee754_hypot(x,y);
+#endif
+}
+libm_hidden_def(hypot)