The Android Open Source Project | b07e1d9 | 2009-03-03 19:29:30 -0800 | [diff] [blame] | 1 | |
| 2 | /* @(#)w_scalb.c 1.3 95/01/18 */ |
| 3 | /* |
| 4 | * ==================================================== |
| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 6 | * |
| 7 | * Developed at SunSoft, a Sun Microsystems, Inc. business. |
| 8 | * Permission to use, copy, modify, and distribute this |
| 9 | * software is freely granted, provided that this notice |
| 10 | * is preserved. |
| 11 | * ==================================================== |
| 12 | */ |
| 13 | |
| 14 | /* |
| 15 | * wrapper ieee_scalb(double x, double fn) is provide for |
| 16 | * passing various standard test suite. One |
| 17 | * should use ieee_scalbn() instead. |
| 18 | */ |
| 19 | |
| 20 | #include "fdlibm.h" |
| 21 | |
| 22 | #include <errno.h> |
| 23 | |
| 24 | #ifdef __STDC__ |
| 25 | #ifdef _SCALB_INT |
| 26 | double ieee_scalb(double x, int fn) /* wrapper scalb */ |
| 27 | #else |
| 28 | double ieee_scalb(double x, double fn) /* wrapper scalb */ |
| 29 | #endif |
| 30 | #else |
| 31 | double ieee_scalb(x,fn) /* wrapper scalb */ |
| 32 | #ifdef _SCALB_INT |
| 33 | double x; int fn; |
| 34 | #else |
| 35 | double x,fn; |
| 36 | #endif |
| 37 | #endif |
| 38 | { |
| 39 | #ifdef _IEEE_LIBM |
| 40 | return __ieee754_scalb(x,fn); |
| 41 | #else |
| 42 | double z; |
| 43 | z = __ieee754_scalb(x,fn); |
| 44 | if(_LIB_VERSION == _IEEE_) return z; |
| 45 | if(!(ieee_finite(z)||ieee_isnan(z))&&ieee_finite(x)) { |
| 46 | return __kernel_standard(x,(double)fn,32); /* scalb overflow */ |
| 47 | } |
| 48 | if(z==0.0&&z!=x) { |
| 49 | return __kernel_standard(x,(double)fn,33); /* scalb underflow */ |
| 50 | } |
| 51 | #ifndef _SCALB_INT |
| 52 | if(!ieee_finite(fn)) errno = ERANGE; |
| 53 | #endif |
| 54 | return z; |
| 55 | #endif |
| 56 | } |