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lightning-sunbird  0.9+nobinonly
e_scalb.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
00030  * of those above. If you wish to allow use of your version of this file only
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00036  * the terms of any one of the MPL, the GPL or the LGPL.
00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 /* @(#)e_scalb.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  * __ieee754_scalb(x, fn) is provide for
00054  * passing various standard test suite. One 
00055  * should use scalbn() instead.
00056  */
00057 
00058 #include "fdlibm.h"
00059 
00060 #ifdef _SCALB_INT
00061 #ifdef __STDC__
00062        double __ieee754_scalb(double x, int fn)
00063 #else
00064        double __ieee754_scalb(x,fn)
00065        double x; int fn;
00066 #endif
00067 #else
00068 #ifdef __STDC__
00069        double __ieee754_scalb(double x, double fn)
00070 #else
00071        double __ieee754_scalb(x,fn)
00072        double x, fn;
00073 #endif
00074 #endif
00075 {
00076 #ifdef _SCALB_INT
00077        return fd_scalbn(x,fn);
00078 #else
00079        if (fd_isnan(x)||fd_isnan(fn)) return x*fn;
00080        if (!fd_finite(fn)) {
00081            if(fn>0.0) return x*fn;
00082            else       return x/(-fn);
00083        }
00084        if (fd_rint(fn)!=fn) return (fn-fn)/(fn-fn);
00085        if ( fn > 65000.0) return fd_scalbn(x, 65000);
00086        if (-fn > 65000.0) return fd_scalbn(x,-65000);
00087        return fd_scalbn(x,(int)fn);
00088 #endif
00089 }