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lightning-sunbird  0.9+nobinonly
w_atan2.c
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00001 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
00002  *
00003  * ***** BEGIN LICENSE BLOCK *****
00004  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00005  *
00006  * The contents of this file are subject to the Mozilla Public License Version
00007  * 1.1 (the "License"); you may not use this file except in compliance with
00008  * the License. You may obtain a copy of the License at
00009  * http://www.mozilla.org/MPL/
00010  *
00011  * Software distributed under the License is distributed on an "AS IS" basis,
00012  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00013  * for the specific language governing rights and limitations under the
00014  * License.
00015  *
00016  * The Original Code is Mozilla Communicator client code, released
00017  * March 31, 1998.
00018  *
00019  * The Initial Developer of the Original Code is
00020  * Sun Microsystems, Inc.
00021  * Portions created by the Initial Developer are Copyright (C) 1998
00022  * the Initial Developer. All Rights Reserved.
00023  *
00024  * Contributor(s):
00025  *
00026  * Alternatively, the contents of this file may be used under the terms of
00027  * either of the GNU General Public License Version 2 or later (the "GPL"),
00028  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00029  * in which case the provisions of the GPL or the LGPL are applicable instead
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00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 /* @(#)w_atan2.c 1.3 95/01/18 */
00041 /*
00042  * ====================================================
00043  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
00044  *
00045  * Developed at SunSoft, a Sun Microsystems, Inc. business.
00046  * Permission to use, copy, modify, and distribute this
00047  * software is freely granted, provided that this notice 
00048  * is preserved.
00049  * ====================================================
00050  *
00051  */
00052 
00053 /* 
00054  * wrapper atan2(y,x)
00055  */
00056 
00057 #include "fdlibm.h"
00058 
00059 
00060 #ifdef __STDC__
00061        double fd_atan2(double y, double x)       /* wrapper atan2 */
00062 #else
00063        double fd_atan2(y,x)               /* wrapper atan2 */
00064        double y,x;
00065 #endif
00066 {
00067 #ifdef _IEEE_LIBM
00068        return __ieee754_atan2(y,x);
00069 #else
00070        double z;
00071        z = __ieee754_atan2(y,x);
00072        if(_LIB_VERSION == _IEEE_||fd_isnan(x)||fd_isnan(y)) return z;
00073        if(x==0.0&&y==0.0) {
00074         int err;
00075         return __kernel_standard(y,x,3,&err); /* atan2(+-0,+-0) */
00076        } else
00077            return z;
00078 #endif
00079 }