1/* Return arc sine of complex float value.
2 Copyright (C) 1997-2016 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, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <complex.h>
21#include <math.h>
22#include <math_private.h>
23
24
25__complex__ float
26__casinf (__complex__ float x)
27{
28 __complex__ float 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 (isinf (__real__ x) || isinf (__imag__ x))
37 {
38 __real__ res = __nanf ("");
39 __imag__ res = __copysignf (HUGE_VALF, __imag__ x);
40 }
41 else
42 {
43 __real__ res = __nanf ("");
44 __imag__ res = __nanf ("");
45 }
46 }
47 else
48 {
49 __complex__ float y;
50
51 __real__ y = -__imag__ x;
52 __imag__ y = __real__ x;
53
54 y = __casinhf (y);
55
56 __real__ res = __imag__ y;
57 __imag__ res = -__real__ y;
58 }
59
60 return res;
61}
62#ifndef __casinf
63weak_alias (__casinf, casinf)
64#endif
65