glibc/sysdeps/generic/s_casin.c
Jakub Jelinek 0ecb606cb6 2.5-18.1
2007-07-12 18:26:36 +00:00

67 lines
1.7 KiB
C

/* Return arc sine of complex double value.
Copyright (C) 1997 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>
__complex__ double
__casin (__complex__ double x)
{
__complex__ double res;
if (isnan (__real__ x) || isnan (__imag__ x))
{
if (__real__ x == 0.0)
{
res = x;
}
else if (__isinf (__real__ x) || __isinf (__imag__ x))
{
__real__ res = __nan ("");
__imag__ res = __copysign (HUGE_VAL, __imag__ x);
}
else
{
__real__ res = __nan ("");
__imag__ res = __nan ("");
}
}
else
{
__complex__ double y;
__real__ y = -__imag__ x;
__imag__ y = __real__ x;
y = __casinh (y);
__real__ res = __imag__ y;
__imag__ res = -__real__ y;
}
return res;
}
weak_alias (__casin, casin)
#ifdef NO_LONG_DOUBLE
strong_alias (__casin, __casinl)
weak_alias (__casin, casinl)
#endif