1/* @(#)w_scalb.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13#if defined(LIBM_SCCS) && !defined(lint)
14static char rcsid[] = "$NetBSD: w_scalb.c,v 1.6 1995/05/10 20:49:48 jtc Exp $";
15#endif
16
17/*
18 * wrapper scalb(double x, double fn) is provide for
19 * passing various standard test suite. One
20 * should use scalbn() instead.
21 */
22
23#include "math.h"
24#include "math_private.h"
25
26#include <errno.h>
27
28#ifdef __STDC__
29#ifdef _SCALB_INT
30	double __scalb(double x, int fn)		/* wrapper scalb */
31#else
32	double __scalb(double x, double fn)	/* wrapper scalb */
33#endif
34#else
35	double __scalb(x,fn)			/* wrapper scalb */
36#ifdef _SCALB_INT
37	double x; int fn;
38#else
39	double x,fn;
40#endif
41#endif
42{
43#ifdef _IEEE_LIBM
44	return __ieee754_scalb(x,fn);
45#else
46	double z;
47	z = __ieee754_scalb(x,fn);
48	if(_LIB_VERSION != _SVID_) return z;
49	if(!(__finite(z)||__isnan(z))&&__finite(x)) {
50	    return __kernel_standard(x,(double)fn,32); /* scalb overflow */
51	}
52	if(z==0.0&&z!=x) {
53	    return __kernel_standard(x,(double)fn,33); /* scalb underflow */
54	}
55#ifndef _SCALB_INT
56	if(!__finite(fn)) __set_errno (ERANGE);
57#endif
58	return z;
59#endif
60}
61weak_alias (__scalb, scalb)
62#ifdef NO_LONG_DOUBLE
63strong_alias (__scalb, __scalbl)
64weak_alias (__scalb, scalbl)
65#endif
66