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 1.9 2002/05/26 22:02:02 wiz 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
30 double
scalb(double x,int fn)31 scalb(double x, int fn) /* wrapper scalb */
32 #else
33 double
34 scalb(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