1
2/* @(#)w_scalb.c 1.3 95/01/18 */
3/*
4 * ====================================================
5 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 *
7 * Developed at SunSoft, a Sun Microsystems, Inc. business.
8 * Permission to use, copy, modify, and distribute this
9 * software is freely granted, provided that this notice
10 * is preserved.
11 * ====================================================
12 */
13
14/*
15 * wrapper ieee_scalb(double x, double fn) is provide for
16 * passing various standard test suite. One
17 * should use ieee_scalbn() instead.
18 */
19
20#include "fdlibm.h"
21
22#include <errno.h>
23
24#ifdef __STDC__
25#ifdef _SCALB_INT
26	double ieee_scalb(double x, int fn)		/* wrapper scalb */
27#else
28	double ieee_scalb(double x, double fn)	/* wrapper scalb */
29#endif
30#else
31	double ieee_scalb(x,fn)			/* wrapper scalb */
32#ifdef _SCALB_INT
33	double x; int fn;
34#else
35	double x,fn;
36#endif
37#endif
38{
39#ifdef _IEEE_LIBM
40	return __ieee754_scalb(x,fn);
41#else
42	double z;
43	z = __ieee754_scalb(x,fn);
44	if(_LIB_VERSION == _IEEE_) return z;
45	if(!(ieee_finite(z)||ieee_isnan(z))&&ieee_finite(x)) {
46	    return __kernel_standard(x,(double)fn,32); /* scalb overflow */
47	}
48	if(z==0.0&&z!=x) {
49	    return __kernel_standard(x,(double)fn,33); /* scalb underflow */
50	}
51#ifndef _SCALB_INT
52	if(!ieee_finite(fn)) errno = ERANGE;
53#endif
54	return z;
55#endif
56}
57