1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * ***** BEGIN LICENSE BLOCK *****
4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 *
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is Mozilla Communicator client code, released
17 * March 31, 1998.
18 *
19 * The Initial Developer of the Original Code is
20 * Sun Microsystems, Inc.
21 * Portions created by the Initial Developer are Copyright (C) 1998
22 * the Initial Developer. All Rights Reserved.
23 *
24 * Contributor(s):
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
37 *
38 * ***** END LICENSE BLOCK ***** */
40 /* @(#)w_scalb.c 1.3 95/01/18 */
41 /*
42 * ====================================================
43 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
44 *
45 * Developed at SunSoft, a Sun Microsystems, Inc. business.
46 * Permission to use, copy, modify, and distribute this
47 * software is freely granted, provided that this notice
48 * is preserved.
49 * ====================================================
50 */
52 /*
53 * wrapper scalb(double x, double fn) is provide for
54 * passing various standard test suite. One
55 * should use scalbn() instead.
56 */
58 #include "fdlibm.h"
60 #include <errno.h>
62 #ifdef __STDC__
63 #ifdef _SCALB_INT
64 double fd_scalb(double x, int fn) /* wrapper scalb */
65 #else
66 double fd_scalb(double x, double fn) /* wrapper scalb */
67 #endif
68 #else
69 double fd_scalb(x,fn) /* wrapper scalb */
70 #ifdef _SCALB_INT
71 double x; int fn;
72 #else
73 double x,fn;
74 #endif
75 #endif
76 {
77 #ifdef _IEEE_LIBM
78 return __ieee754_scalb(x,fn);
79 #else
80 double z;
81 int err;
82 z = __ieee754_scalb(x,fn);
83 if(_LIB_VERSION == _IEEE_) return z;
84 if(!(fd_finite(z)||fd_isnan(z))&&fd_finite(x)) {
85 return __kernel_standard(x,(double)fn,32,&err); /* scalb overflow */
86 }
87 if(z==0.0&&z!=x) {
88 return __kernel_standard(x,(double)fn,33,&err); /* scalb underflow */
89 }
90 #ifndef _SCALB_INT
91 if(!fd_finite(fn)) errno = ERANGE;
92 #endif
93 return z;
94 #endif
95 }