/* Return arc sine of complex double value. Copyright (C) 1997-2015 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, see <http://www.gnu.org/licenses/>. */ #include <complex.h> #include <math.h> #include <math_private.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