| 0,0 → 1,61 |
|---|
| /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| /* @(#)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. |
| * ==================================================== |
| */ |
| |
| #if defined(LIBM_SCCS) && !defined(lint) |
| static char rcsid[] = "$Id: w_scalb.c,v 1.4 1994/08/10 20:35:37 jtc 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 __STDC__ |
| #ifdef _SCALB_INT |
| double scalb(double x, int fn) /* wrapper scalb */ |
| #else |
| double scalb(double x, double fn) /* wrapper scalb */ |
| #endif |
| #else |
| double scalb(x,fn) /* wrapper scalb */ |
| #ifdef _SCALB_INT |
| double x; int fn; |
| #else |
| double x,fn; |
| #endif |
| #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 |
| } |