57 lines
2.0 KiB
C
57 lines
2.0 KiB
C
/* $NetBSD: ctanl.c,v 1.1 2014/10/10 00:48:18 christos Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2007 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software written by Stephen L. Moshier.
|
|
* It is redistributed by the NetBSD Foundation by permission of the author.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
|
|
#include <complex.h>
|
|
#include <math.h>
|
|
#include "cephes_subrl.h"
|
|
|
|
long double complex
|
|
ctanl(long double complex z)
|
|
{
|
|
long double complex w;
|
|
long double d;
|
|
|
|
d = cosl(2.0L * creall(z)) + coshl(2.0L * cimagl(z));
|
|
|
|
if (fabsl(d) < 0.25L)
|
|
d = _ctansl(z);
|
|
|
|
if (d == 0.0L) {
|
|
/* mtherr ("ctan", OVERFLOW); */
|
|
w = HUGE_VALL + HUGE_VALL * I;
|
|
return w;
|
|
}
|
|
|
|
w = sinl(2.0L * creall(z)) / d + (sinhl(2.0L * cimagl(z)) / d) * I;
|
|
return w;
|
|
}
|