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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | |
| 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 | |||
| 14 | * wrapper scalb(double x, double fn) is provide for |
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| 15 | * passing various standard test suite. One |
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| 16 | * should use scalbn() instead. |
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| 17 | */ |
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| 18 | |||
| 19 | |||
| 20 | #include |
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| 21 | |||
| 22 | |||
| 23 | |||
| 24 | |||
| 25 | #ifdef _SCALB_INT |
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| 26 | double scalb(double x, int fn) /* wrapper scalb */ |
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| 27 | #else |
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| 28 | double scalb(double x, double fn) /* wrapper scalb */ |
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| 29 | #endif |
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| 30 | #else |
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| 31 | double scalb(x,fn) /* wrapper scalb */ |
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| 32 | #ifdef _SCALB_INT |
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| 33 | double x; int fn; |
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| 34 | #else |
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| 35 | double x,fn; |
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| 36 | #endif |
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| 37 | #endif |
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| 38 | { |
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| 39 | #ifdef _IEEE_LIBM |
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| 40 | return __ieee754_scalb(x,fn); |
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| 41 | #else |
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| 42 | double z; |
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| 43 | #ifndef HUGE_VAL |
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| 44 | #define HUGE_VAL inf |
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| 45 | double inf = 0.0; |
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| 46 | |||
| 47 | |||
| 48 | #endif |
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| 49 | struct exception exc; |
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| 50 | z = __ieee754_scalb(x,fn); |
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| 51 | if(_LIB_VERSION == _IEEE_) return z; |
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| 52 | if(!(finite(z)||isnan(z))&&finite(x)) { |
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| 53 | /* scalb overflow; SVID also returns +-HUGE_VAL */ |
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| 54 | exc.type = OVERFLOW; |
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| 55 | exc.name = "scalb"; |
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| 56 | exc.err = 0; |
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| 57 | exc.arg1 = x; |
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| 58 | exc.arg2 = fn; |
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| 59 | exc.retval = x > 0.0 ? HUGE_VAL : -HUGE_VAL; |
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| 60 | if (_LIB_VERSION == _POSIX_) |
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| 61 | errno = ERANGE; |
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| 62 | else if (!matherr(&exc)) { |
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| 63 | errno = ERANGE; |
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| 64 | } |
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| 65 | if (exc.err != 0) |
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| 66 | errno = exc.err; |
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| 67 | return exc.retval; |
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| 68 | } |
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| 69 | if(z==0.0&&z!=x) { |
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| 70 | /* scalb underflow */ |
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| 71 | exc.type = UNDERFLOW; |
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| 72 | exc.name = "scalb"; |
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| 73 | exc.err = 0; |
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| 74 | exc.arg1 = x; |
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| 75 | exc.arg2 = fn; |
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| 76 | exc.retval = copysign(0.0,x); |
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| 77 | if (_LIB_VERSION == _POSIX_) |
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| 78 | errno = ERANGE; |
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| 79 | else if (!matherr(&exc)) { |
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| 80 | errno = ERANGE; |
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| 81 | } |
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| 82 | if (exc.err != 0) |
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| 83 | errno = exc.err; |
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| 84 | return exc.retval; |
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| 85 | } |
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| 86 | #ifndef _SCALB_INT |
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| 87 | if(!finite(fn)) errno = ERANGE; |
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| 88 | #endif |
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| 89 | return z; |
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| 90 | #endif |
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| 91 | } |
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| 92 | |||
| 93 | |||
| 94 |