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 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 23 */ 24 /* 25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 26 * Use is subject to license terms. 27 */ 28 29 #pragma weak __carg = carg 30 31 #include <math.h> /* atan2 */ 32 #include "complex_wrapper.h" 33 34 static const double 35 pi = 3.14159265358979311600e+00, 36 pi_lo = 1.22464679914735320717e-16; 37 38 double carg(dcomplex z)39carg(dcomplex z) { 40 int ix, iy; 41 42 ix = ((int *)&(D_RE(z)))[HIWORD]; 43 iy = ((int *)&(D_IM(z)))[HIWORD]; 44 if ((((ix | iy) & ~0x80000000) | ((int *)&(D_RE(z)))[LOWORD] | 45 ((int *)&(D_IM(z)))[LOWORD]) == 0) { 46 /* x and y are both zero */ 47 if (ix == 0) 48 return (D_IM(z)); 49 return ((iy == 0)? pi + pi_lo : -pi - pi_lo); 50 } 51 return (atan2(D_IM(z), D_RE(z))); 52 } 53