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[glibc/history.git] / math / s_ccosl.c
blob4ebe2c347dbe5946bec8bc58b1eb4fd9e843948d
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.
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.
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.
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. */
21 #include <complex.h>
22 #include <fenv.h>
23 #include <math.h>
26 __complex__ long double
27 __ccosl (__complex__ long double x)
29 __complex__ long double res;
31 if (!isfinite (__real__ x) || __isnanl (__imag__ x))
33 if (__real__ x == 0.0 || __imag__ x == 0.0)
35 __real__ res = __nanl ("");
36 __imag__ res = 0.0;
38 #ifdef FE_INVALID
39 if (__isinfl (__real__ x))
40 feraiseexcept (FE_INVALID);
41 #endif
43 else if (__isinfl (__imag__ x))
45 __real__ res = HUGE_VALL;
46 __imag__ res = __nanl ("");
48 #ifdef FE_INVALID
49 if (__isinfl (__real__ x))
50 feraiseexcept (FE_INVALID);
51 #endif
53 else
55 __real__ res = __nanl ("");
56 __imag__ res = __nanl ("");
58 #ifdef FE_INVALID
59 if (isfinite (__imag__ x))
60 feraiseexcept (FE_INVALID);
61 #endif
64 else
66 __complex__ long double y;
68 __real__ y = -__imag__ x;
69 __imag__ y = __real__ x;
71 res = __ccoshl (y);
74 return res;
76 weak_alias (__ccosl, ccosl)