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, 43 insertions, 0 deletions

diff --git a/libm/w_exp10.c b/libm/w_exp10.c
new file mode 100644
index 000000000..120c0908e
--- /dev/null
+++ b/libm/w_exp10.c
@@ -0,0 +1,43 @@
+/* Copyright (C) 2011-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+
+/*
+ * wrapper exp10(x)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+double
+exp10 (double x)
+{
+#if __UCLIBC_HAS_FENV__
+  double z = __ieee754_exp10 (x);
+  if (__builtin_expect (!isfinite (z) || z == 0, 0)
+      && isfinite (x) && _LIB_VERSION != _IEEE_)
+    /* exp10 overflow (46) if x > 0, underflow (47) if x < 0.  */
+    return __kernel_standard (x, x, 46 + !!signbit (x));
+
+  return z;
+#else
+  return __ieee754_exp10 (x);
+#endif
+}
+libm_hidden_def(exp10)
+strong_alias (exp10, pow10)