[BZ #6803] Set errno for scalbln, scalbn

Errno is not set and the testcases will fail.

Now the scalbln-aliases are removed in i386/m68
and the wrappers are used when calling the scalbln-functions.

On ia64 only scalblnf has its own implementation.
For scalbln and scalblnl the ieee754/dbl-64 and ieee754/ldbl-96 are used, thus
the wrappers are needed, too.

1 files changed, 40 insertions, 0 deletions

diff --git a/math/w_scalbln.c b/math/w_scalbln.c
new file mode 100644
index 0000000000..7167fdf6ea
--- /dev/null
+++ b/math/w_scalbln.c
@@ -0,0 +1,40 @@
+/* Wrapper for __scalbln handles setting errno.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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/>.  */
+
+#include <errno.h>
+#include <math.h>
+#include <math_private.h>
+
+double
+__w_scalbln (double x, long int n)
+{
+  if (!__finite (x) || x == 0.0)
+    return x;
+
+  x = __scalbln (x, n);
+
+  if (!__finite (x) || x == 0.0)
+    __set_errno (ERANGE);
+
+  return x;
+}
+weak_alias (__w_scalbln, scalbln)
+
+#ifdef NO_LONG_DOUBLE
+weak_alias (__w_scalbln, scalblnl)
+#endif