Update.
[glibc.git] / sysdeps / libm-ieee754 / s_casinf.c
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1 /* Return arc sine of complex float 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 Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 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 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #include <complex.h>
22 #include <math.h>
25 __complex__ float
26 __casinf (__complex__ float x)
28 __complex__ float res;
30 if (isnan (__real__ x) || isnan (__imag__ x))
32 if (__real__ x == 0.0)
34 res = x;
36 else if (__isinff (__real__ x) || __isinff (__imag__ x))
38 __real__ res = __nanf ("");
39 __imag__ res = __copysignf (HUGE_VALF, __imag__ x);
41 else
43 __real__ res = __nanf ("");
44 __imag__ res = __nanf ("");
47 else
49 __complex__ float y;
51 __real__ y = -__imag__ x;
52 __imag__ y = __real__ x;
54 y = __casinhf (y);
56 __real__ res = __imag__ y;
57 __imag__ res = -__real__ y;
60 return res;
62 weak_alias (__casinf, casinf)