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, 40 insertions, 0 deletions

diff --git a/libm/w_hypotl.c b/libm/w_hypotl.c
new file mode 100644
index 000000000..ebbb1a1c0
--- /dev/null
+++ b/libm/w_hypotl.c
@@ -0,0 +1,40 @@
+/* w_hypotl.c -- long double version of w_hypot.c.
+ * Conversion to long double by Ulrich Drepper,
+ * Cygnus Support, drepper@cygnus.com.
+ */
+
+/*
+ * ====================================================
+ * 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 hypotl(x,y)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+#if !defined __NO_LONG_DOUBLE_MATH
+long double
+hypotl(long double x, long double y)
+{
+# if __UCLIBC_HAS_FENV__
+	long double z;
+	z = (long double) __ieee754_hypot((double) x, (double) y);
+	if(__builtin_expect(!isfinite(z), 0)
+	   && isfinite(x) && isfinite(y) && _LIB_VERSION != _IEEE_)
+	    return __kernel_standard_l(x, y, 204); /* hypot overflow */
+
+	return z;
+# else
+	return (long double) __ieee754_hypot((double) x, (double) y);
+# endif /* __UCLIBC_HAS_FENV__ */
+}
+#endif /* __NO_LONG_DOUBLE_MATH */