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authorUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
commitabfbdde177c3a7155070dda1b2cdc8292054cc26 (patch)
treee021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/generic/s_ctanh.c
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
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Update.
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diff --git a/sysdeps/generic/s_ctanh.c b/sysdeps/generic/s_ctanh.c
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+/* Complex hyperbole tangent for double.
+ Copyright (C) 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <complex.h>
+#include <fenv.h>
+#include <math.h>
+
+#include "math_private.h"
+
+
+__complex__ double
+__ctanh (__complex__ double x)
+{
+ __complex__ double res;
+
+ if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+ {
+ if (__isinf (__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 ("");
+
+#ifdef FE_INVALID
+ if (__isinf (__imag__ x))
+ feraiseexcept (FE_INVALID);
+#endif
+ }
+ }
+ else
+ {
+ double sin2ix, cos2ix;
+ double den;
+
+ __sincos (2.0 * __imag__ x, &sin2ix, &cos2ix);
+
+ den = (__ieee754_cosh (2.0 * __real__ x) + cos2ix);
+
+ __real__ res = __ieee754_sinh (2.0 * __real__ x) / den;
+ __imag__ res = sin2ix / den;
+ }
+
+ return res;
+}
+weak_alias (__ctanh, ctanh)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__ctanh, __ctanhl)
+weak_alias (__ctanh, ctanhl)
+#endif