/* @(#)w_scalb.c 5.1 93/09/24 */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ #include <sys/cdefs.h> #if defined(LIBM_SCCS) && !defined(lint) __RCSID("$NetBSD: w_scalb.c,v 1.9 2002/05/26 22:02:02 wiz Exp $"); #endif /* * wrapper scalb(double x, double fn) is provide for * passing various standard test suite. One * should use scalbn() instead. */ #include "math.h" #include "math_private.h" #include <errno.h> #ifdef _SCALB_INT double scalb(double x, int fn) /* wrapper scalb */ #else double scalb(double x, double fn) /* wrapper scalb */ #endif { #ifdef _IEEE_LIBM return __ieee754_scalb(x,fn); #else double z; z = __ieee754_scalb(x,fn); if(_LIB_VERSION == _IEEE_) return z; if(!(finite(z)||isnan(z))&&finite(x)) { return __kernel_standard(x,(double)fn,32); /* scalb overflow */ } if(z==0.0&&z!=x) { return __kernel_standard(x,(double)fn,33); /* scalb underflow */ } #ifndef _SCALB_INT if(!finite(fn)) errno = ERANGE; #endif return z; #endif } |