summaryrefslogtreecommitdiff
path: root/libc/math/s_casinf.c
blob: 56c618fcf1ad7601d84d3dff11908002cb6355d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
/* Return arc sine of complex float value.
   Copyright (C) 1997, 2011 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <complex.h>
#include <math.h>
#include <math_private.h>


__complex__ float
__casinf (__complex__ float x)
{
  __complex__ float res;

  if (isnan (__real__ x) || isnan (__imag__ x))
    {
      if (__real__ x == 0.0)
	{
	  res = x;
	}
      else if (__isinf_nsf (__real__ x) || __isinf_nsf (__imag__ x))
	{
	  __real__ res = __nanf ("");
	  __imag__ res = __copysignf (HUGE_VALF, __imag__ x);
	}
      else
	{
	  __real__ res = __nanf ("");
	  __imag__ res = __nanf ("");
	}
    }
  else
    {
      __complex__ float y;

      __real__ y = -__imag__ x;
      __imag__ y = __real__ x;

      y = __casinhf (y);

      __real__ res = __imag__ y;
      __imag__ res = -__real__ y;
    }

  return res;
}
#ifndef __casinf
weak_alias (__casinf, casinf)
#endif