1 /* Return arc sine 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 <math.h>
23
24
25 __complex__ long double
__casinl(__complex__ long double x)26 __casinl (__complex__ long double x)
27 {
28 __complex__ long double res;
29
30 if (isnan (__real__ x) || isnan (__imag__ x))
31 {
32 if (__real__ x == 0.0)
33 {
34 res = x;
35 }
36 else if (__isinfl (__real__ x) || __isinfl (__imag__ x))
37 {
38 __real__ res = nanl ("");
39 __imag__ res = copysignl (HUGE_VALL, __imag__ x);
40 }
41 else
42 {
43 __real__ res = nanl ("");
44 __imag__ res = nanl ("");
45 }
46 }
47 else
48 {
49 __complex__ long double y;
50
51 __real__ y = -__imag__ x;
52 __imag__ y = __real__ x;
53
54 y = __casinhl (y);
55
56 __real__ res = __imag__ y;
57 __imag__ res = -__real__ y;
58 }
59
60 return res;
61 }
62 weak_alias (__casinl, casinl)
63