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lightning-sunbird  0.9+nobinonly
w_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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00035  * the provisions above, a recipient may use your version of this file under
00036  * the terms of any one of the MPL, the GPL or the LGPL.
00037  *
00038  * ***** END LICENSE BLOCK ***** */
00039 
00040 /* @(#)w_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  * wrapper scalb(double x, double fn) is provide for
00054  * passing various standard test suite. One 
00055  * should use scalbn() instead.
00056  */
00057 
00058 #include "fdlibm.h"
00059 
00060 #include <errno.h>
00061 
00062 #ifdef __STDC__
00063 #ifdef _SCALB_INT
00064        double fd_scalb(double x, int fn)         /* wrapper scalb */
00065 #else
00066        double fd_scalb(double x, double fn)      /* wrapper scalb */
00067 #endif
00068 #else
00069        double fd_scalb(x,fn)                     /* wrapper scalb */
00070 #ifdef _SCALB_INT
00071        double x; int fn;
00072 #else
00073        double x,fn;
00074 #endif
00075 #endif
00076 {
00077 #ifdef _IEEE_LIBM
00078        return __ieee754_scalb(x,fn);
00079 #else
00080        double z;
00081     int err;
00082        z = __ieee754_scalb(x,fn);
00083        if(_LIB_VERSION == _IEEE_) return z;
00084        if(!(fd_finite(z)||fd_isnan(z))&&fd_finite(x)) {
00085            return __kernel_standard(x,(double)fn,32,&err); /* scalb overflow */
00086        }
00087        if(z==0.0&&z!=x) {
00088            return __kernel_standard(x,(double)fn,33,&err); /* scalb underflow */
00089        } 
00090 #ifndef _SCALB_INT
00091        if(!fd_finite(fn)) errno = ERANGE;
00092 #endif
00093        return z;
00094 #endif 
00095 }