1 files changed, 70 insertions, 0 deletions
diff --git a/libstdc++-v3/math/ctanh.c b/libstdc++-v3/math/ctanh.c
new file mode 100644
index 0000000..5db5cd6
--- /dev/null
+++ b/libstdc++-v3/math/ctanh.c
@@ -0,0 +1,70 @@
+/* Complex hyperbole tangent for double. */
+
+/* Copyright (C) 1997-1999 Free Software Foundation, Inc.
+
+   This file is part of the GNU ISO C++ Library.  This library is free
+   software; you can redistribute it and/or modify it under the
+   terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along
+   with this library; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+   USA.
+
+   As a special exception, you may use this file as part of a free software
+   library without restriction.  Specifically, if other files instantiate
+   templates or use macros or inline functions from this file, or you compile
+   this file and link it with other files to produce an executable, this
+   file does not by itself cause the resulting executable to be covered by
+   the GNU General Public License.  This exception does not however
+   invalidate any other reasons why the executable file might be covered by
+   the GNU General Public License.  */
+
+
+#include <math.h>
+#include "mathconf.h"
+
+
+__complex__ double
+ctanh (__complex__ double x)
+{
+  __complex__ double res;
+
+  if (!FINITE_P (__real__ x) || !FINITE_P (__imag__ x))
+    {
+      if (INFINITE_P (__real__ x))
+	{
+	  __real__ res = copysign (1.0, __real__ x);
+	  __imag__ res = copysign (0.0, __imag__ x);
+	}
+      else if (__imag__ x == 0.0)
+	{
+	  res = x;
+	}
+      else
+	{
+	  __real__ res = NAN;
+	  __imag__ res = NAN;
+	}
+    }
+  else
+    {
+      double sin2ix = sin (2.0 * __imag__ x);
+      double cos2ix = cos (2.0 * __imag__ x);
+      double den;
+
+      den = (cosh (2.0 * __real__ x) + cos2ix);
+
+      __real__ res = sinh (2.0 * __real__ x) / den;
+      __imag__ res = sin2ix / den;
+    }
+
+  return res;
+}