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[glibc.git] / math / w_scalb.c
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1 /* @(#)w_scalb.c 5.1 93/09/24 */
2 /*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 * ====================================================
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static char rcsid[] = "$NetBSD: w_scalb.c,v 1.6 1995/05/10 20:49:48 jtc Exp $";
15 #endif
18 * wrapper scalb(double x, double fn) is provide for
19 * passing various standard test suite. One
20 * should use scalbn() instead.
23 #include "math.h"
24 #include "math_private.h"
26 #include <errno.h>
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
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 == _IEEE_) return z;
49 if(!(__finite(z)||__isnan(z))&&__finite(x)) {
50 return __kernel_standard(x,(double)fn,32); /* scalb overflow */
52 if(z==0.0&&z!=x) {
53 return __kernel_standard(x,(double)fn,33); /* scalb underflow */
55 #ifndef _SCALB_INT
56 if(!__finite(fn)) __set_errno (ERANGE);
57 #endif
58 return z;
59 #endif
61 weak_alias (__scalb, scalb)
62 #ifdef NO_LONG_DOUBLE
63 strong_alias (__scalb, __scalbl)
64 weak_alias (__scalb, scalbl)
65 #endif