1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/* @(#)w_scalb.c 5.1 93/09/24 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: w_scalb.c,v 1.6 1995/05/10 20:49:48 jtc Exp $";
#endif
/*
* wrapper scalb(double x, double fn) is provide for
* passing various standard test suite. One
* should use scalbn() instead.
*/
#include <math.h>
#include "math_private.h"
#include <errno.h>
#ifdef __STDC__
#ifdef _SCALB_INT
double scalb(double x, int fn) /* wrapper scalb */
#else
double scalb(double x, double fn) /* wrapper scalb */
#endif
#else
double scalb(x,fn) /* wrapper scalb */
#ifdef _SCALB_INT
double x; int fn;
#else
double x,fn;
#endif
#endif
{
#ifdef _IEEE_LIBM
return __ieee754_scalb(x,fn);
#else
double z;
z = __ieee754_scalb(x,fn);
if(_LIB_VERSION == _IEEE_) return z;
if(!(finite(z)||isnan(z))&&finite(x)) {
return __kernel_standard(x,(double)fn,32); /* scalb overflow */
}
if(z==0.0&&z!=x) {
return __kernel_standard(x,(double)fn,33); /* scalb underflow */
}
#ifndef _SCALB_INT
if(!finite(fn)) errno = ERANGE;
#endif
return z;
#endif
}
libm_hidden_def(scalb)
|
