1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #pragma weak __cacosh = cacosh 31 32 /* INDENT OFF */ 33 /* 34 * dcomplex cacosh(dcomplex z); 35 * cacosh z = +-i cacos z . 36 * In order to make conj(cacosh(z))=cacosh(conj(z)), 37 * we define 38 * cacosh z = sign(Im(z))*i cacos z . 39 * 40 */ 41 /* INDENT ON */ 42 43 #include "libm.h" /* fabs/isnan/isinf/signbit */ 44 #include "complex_wrapper.h" 45 46 /* need to work on special cases according to spec */ 47 48 dcomplex 49 cacosh(dcomplex z) { 50 dcomplex w, ans; 51 double x, y; 52 53 w = cacos(z); 54 x = D_RE(z); 55 y = D_IM(z); 56 if (isnan(y)) { 57 D_IM(ans) = y + y; 58 if (isinf(x)) 59 D_RE(ans) = fabs(x); 60 else 61 D_RE(ans) = y; 62 } else if (signbit(y) == 0) { 63 D_RE(ans) = -D_IM(w); 64 D_IM(ans) = D_RE(w); 65 } else { 66 D_RE(ans) = D_IM(w); 67 D_IM(ans) = -D_RE(w); 68 } 69 return (ans); 70 } 71