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 1.7 1997/10/09 11:36:01 lukem 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 __STDC__ 30 #ifdef _SCALB_INT 31 double scalb(double x, int fn) /* wrapper scalb */ 32 #else 33 double scalb(double x, double fn) /* wrapper scalb */ 34 #endif 35 #else 36 double scalb(x,fn) /* wrapper scalb */ 37 #ifdef _SCALB_INT 38 double x; int fn; 39 #else 40 double x,fn; 41 #endif 42 #endif 43 { 44 #ifdef _IEEE_LIBM 45 return __ieee754_scalb(x,fn); 46 #else 47 double z; 48 z = __ieee754_scalb(x,fn); 49 if(_LIB_VERSION == _IEEE_) return z; 50 if(!(finite(z)||isnan(z))&&finite(x)) { 51 return __kernel_standard(x,(double)fn,32); /* scalb overflow */ 52 } 53 if(z==0.0&&z!=x) { 54 return __kernel_standard(x,(double)fn,33); /* scalb underflow */ 55 } 56 #ifndef _SCALB_INT 57 if(!finite(fn)) errno = ERANGE; 58 #endif 59 return z; 60 #endif 61 } 62