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#include <sys/cdefs.h>
14#if defined(LIBM_SCCS) && !defined(lint)
15__RCSID("$NetBSD: w_scalb.c,v 1.8 1999/07/02 15:37:45 simonb Exp $");
16#endif
17
18/*
19 * wrapper scalb(double x, double fn) is provide for
20 * passing various standard test suite. One
21 * should use scalbn() instead.
22 */
23
24#include "math.h"
25#include "math_private.h"
26
27#include <errno.h>
28
29#ifdef _SCALB_INT
30double
31scalb(double x, int fn)		/* wrapper scalb */
32#else
33double
34scalb(double x, double fn)	/* wrapper scalb */
35#endif
36{
37#ifdef _IEEE_LIBM
38	return __ieee754_scalb(x,fn);
39#else
40	double z;
41	z = __ieee754_scalb(x,fn);
42	if(_LIB_VERSION == _IEEE_) return z;
43	if(!(finite(z)||isnan(z))&&finite(x)) {
44	    return __kernel_standard(x,(double)fn,32); /* scalb overflow */
45	}
46	if(z==0.0&&z!=x) {
47	    return __kernel_standard(x,(double)fn,33); /* scalb underflow */
48	}
49#ifndef _SCALB_INT
50	if(!finite(fn)) errno = ERANGE;
51#endif
52	return z;
53#endif
54}
55