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| Rev | Author | Line No. | Line |
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| 2 | pj | 1 | /* @(#)w_scalb.c 5.1 93/09/24 */ |
| 2 | /* |
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| 3 | * ==================================================== |
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| 4 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 5 | * |
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| 6 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 7 | * Permission to use, copy, modify, and distribute this |
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| 8 | * software is freely granted, provided that this notice |
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| 9 | * is preserved. |
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| 10 | * ==================================================== |
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| 11 | */ |
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| 12 | |||
| 13 | #ifndef lint |
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| 14 | static char rcsid[] = "$\Id: w_scalb.c,v 1.2 1995/05/30 05:51:41 rgrimes Exp $"; |
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| 15 | #endif |
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| 16 | |||
| 17 | /* |
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| 18 | * wrapper scalb(double x, double fn) is provide for |
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| 19 | * passing various standard test suite. One |
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| 20 | * should use scalbn() instead. |
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| 21 | */ |
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| 22 | |||
| 23 | #include "math.h" |
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| 24 | #include "math_private.h" |
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| 25 | |||
| 26 | #include <errno.h> |
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| 27 | |||
| 28 | #ifdef __STDC__ |
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| 29 | #ifdef _SCALB_INT |
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| 30 | double scalb(double x, int fn) /* wrapper scalb */ |
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| 31 | #else |
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| 32 | double scalb(double x, double fn) /* wrapper scalb */ |
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| 33 | #endif |
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| 34 | #else |
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| 35 | double scalb(x,fn) /* wrapper scalb */ |
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| 36 | #ifdef _SCALB_INT |
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| 37 | double x; int fn; |
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| 38 | #else |
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| 39 | double x,fn; |
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| 40 | #endif |
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| 41 | #endif |
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| 42 | { |
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| 43 | #ifdef _IEEE_LIBM |
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| 44 | return __ieee754_scalb(x,fn); |
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| 45 | #else |
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| 46 | double z; |
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| 47 | z = __ieee754_scalb(x,fn); |
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| 48 | if(_LIB_VERSION == _IEEE_) return z; |
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| 49 | if(!(finite(z)||isnan(z))&&finite(x)) { |
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| 50 | return __kernel_standard(x,(double)fn,32); /* scalb overflow */ |
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| 51 | } |
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| 52 | if(z==0.0&&z!=x) { |
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| 53 | return __kernel_standard(x,(double)fn,33); /* scalb underflow */ |
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| 54 | } |
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| 55 | #ifndef _SCALB_INT |
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| 56 | if(!finite(fn)) errno = ERANGE; |
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| 57 | #endif |
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| 58 | return z; |
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| 59 | #endif |
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| 60 | } |