| | 1 | /* $NetBSD: ctanl.c,v 1.1 2014/10/10 00:48:18 christos Exp $ */ |
| | 2 | |
| | 3 | /*- |
| | 4 | * Copyright (c) 2007 The NetBSD Foundation, Inc. |
| | 5 | * All rights reserved. |
| | 6 | * |
| | 7 | * This code is derived from software written by Stephen L. Moshier. |
| | 8 | * It is redistributed by the NetBSD Foundation by permission of the author. |
| | 9 | * |
| | 10 | * Redistribution and use in source and binary forms, with or without |
| | 11 | * modification, are permitted provided that the following conditions |
| | 12 | * are met: |
| | 13 | * 1. Redistributions of source code must retain the above copyright |
| | 14 | * notice, this list of conditions and the following disclaimer. |
| | 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 16 | * notice, this list of conditions and the following disclaimer in the |
| | 17 | * documentation and/or other materials provided with the distribution. |
| | 18 | * |
| | 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| | 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| | 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| | 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| | 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| | 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| | 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| | 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| | 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| | 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| | 29 | * POSSIBILITY OF SUCH DAMAGE. |
| | 30 | */ |
| | 31 | |
| | 32 | #include <complex.h> |
| | 33 | #include <float.h> |
| | 34 | #include "math.h" |
| | 35 | #include "cephes_subrl.h" |
| | 36 | |
| | 37 | #define MAXNUM LDBL_MAX |
| | 38 | |
| | 39 | long double complex |
| | 40 | ctanl(long double complex z) |
| | 41 | { |
| | 42 | long double complex w; |
| | 43 | long double d; |
| | 44 | |
| | 45 | d = cosl(2.0L * creall(z)) + coshl(2.0L * cimagl(z)); |
| | 46 | |
| | 47 | if (fabsl(d) < 0.25L) |
| | 48 | d = _ctansl(z); |
| | 49 | |
| | 50 | if (d == 0.0L) { |
| | 51 | /* mtherr ("ctan", OVERFLOW); */ |
| | 52 | w = MAXNUM + MAXNUM * I; |
| | 53 | return w; |
| | 54 | } |
| | 55 | |
| | 56 | w = sinl(2.0L * creall(z)) / d + (sinhl(2.0L * cimagl(z)) / d) * I; |
| | 57 | return w; |
| | 58 | } |
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