Rev 1618 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 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 | #ifndef lint |
||
| 14 | static char rcsid[] = "$\Id: w_scalb.c,v 1.2 1995/05/30 05:51:41 rgrimes Exp $"; |
||
| 15 | #endif |
||
| 16 | |||
| 17 | /* |
||
| 18 | * wrapper scalb(double x, double fn) is provide for |
||
| 19 | * passing various standard test suite. One |
||
| 20 | * should use scalbn() instead. |
||
| 21 | */ |
||
| 22 | |||
| 23 | #include "math.h" |
||
| 24 | #include "math_private.h" |
||
| 25 | |||
| 26 | #include <errno.h> |
||
| 27 | |||
| 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 |
||
| 42 | { |
||
| 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 */ |
||
| 51 | } |
||
| 52 | if(z==0.0&&z!=x) { |
||
| 53 | return __kernel_standard(x,(double)fn,33); /* scalb underflow */ |
||
| 54 | } |
||
| 55 | #ifndef _SCALB_INT |
||
| 56 | if(!finite(fn)) errno = ERANGE; |
||
| 57 | #endif |
||
| 58 | return z; |
||
| 59 | #endif |
||
| 60 | } |