1/* Return cosine of complex long double value.
2   Copyright (C) 1997 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5
6   The GNU C Library is free software; you can redistribute it and/or
7   modify it under the terms of the GNU Lesser General Public
8   License as published by the Free Software Foundation; either
9   version 2.1 of the License, or (at your option) any later version.
10
11   The GNU C Library is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   Lesser General Public License for more details.
15
16   You should have received a copy of the GNU Lesser General Public
17   License along with the GNU C Library; if not, write to the Free
18   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19   02111-1307 USA.  */
20
21#include <complex.h>
22#include <fenv.h>
23#include <math.h>
24
25
26__complex__ long double
27__ccosl (__complex__ long double x)
28{
29  __complex__ long double res;
30
31  if (!isfinite (__real__ x) || __isnanl (__imag__ x))
32    {
33      if (__real__ x == 0.0 || __imag__ x == 0.0)
34	{
35	  __real__ res = nanl ("");
36	  __imag__ res = 0.0;
37
38#ifdef FE_INVALID
39	  if (__isinfl (__real__ x))
40	    feraiseexcept (FE_INVALID);
41#endif
42	}
43      else if (__isinfl (__imag__ x))
44	{
45	  __real__ res = HUGE_VALL;
46	  __imag__ res = nanl ("");
47
48#ifdef FE_INVALID
49	  if (__isinfl (__real__ x))
50	    feraiseexcept (FE_INVALID);
51#endif
52	}
53      else
54	{
55	  __real__ res = nanl ("");
56	  __imag__ res = nanl ("");
57
58#ifdef FE_INVALID
59	  if (isfinite (__imag__ x))
60	    feraiseexcept (FE_INVALID);
61#endif
62	}
63    }
64  else
65    {
66      __complex__ long double y;
67
68      __real__ y = -__imag__ x;
69      __imag__ y = __real__ x;
70
71      res = __ccoshl (y);
72    }
73
74  return res;
75}
76weak_alias (__ccosl, ccosl)
77