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| 2 | /* @(#)wr_gamma.c 5.1 93/09/24 */ |
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| 3 | /* |
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| 4 | * ==================================================== |
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| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 6 | * |
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| 7 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 8 | * Permission to use, copy, modify, and distribute this |
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| 9 | * software is freely granted, provided that this notice |
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| 10 | * is preserved. |
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| 11 | * ==================================================== |
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| 12 | */ |
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| 13 | |
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| 14 | /* |
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| 15 | * wrapper double gamma_r(double x, int *signgamp) |
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| 16 | */ |
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| 17 | |
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| 18 | #include "fdlibm.h" |
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| 19 | #include <errno.h> |
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| 20 | |
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| 21 | #ifndef _DOUBLE_IS_32BITS |
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| 22 | |
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| 23 | #ifdef __STDC__ |
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| 24 | double gamma_r(double x, int *signgamp) /* wrapper lgamma_r */ |
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| 25 | #else |
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| 26 | double gamma_r(x,signgamp) /* wrapper lgamma_r */ |
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| 27 | double x; int *signgamp; |
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| 28 | #endif |
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| 29 | { |
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| 30 | #ifdef _IEEE_LIBM |
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| 31 | return __ieee754_gamma_r(x,signgamp); |
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| 32 | #else |
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| 33 | double y; |
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| 34 | struct exception exc; |
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| 35 | y = __ieee754_gamma_r(x,signgamp); |
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| 36 | if(_LIB_VERSION == _IEEE_) return y; |
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| 37 | if(!finite(y)&&finite(x)) { |
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| 38 | #ifndef HUGE_VAL |
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| 39 | #define HUGE_VAL inf |
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| 40 | double inf = 0.0; |
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| 41 | |
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| 42 | SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ |
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| 43 | #endif |
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| 44 | exc.name = "gamma"; |
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| 45 | exc.err = 0; |
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| 46 | exc.arg1 = exc.arg2 = (double)x; |
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| 47 | if (_LIB_VERSION == _SVID_) |
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| 48 | exc.retval = HUGE; |
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| 49 | else |
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| 50 | exc.retval = HUGE_VAL; |
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| 51 | if(floor(x)==x&&x<=0.0) { |
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| 52 | /* gamma(-integer) or gamma(0) */ |
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| 53 | exc.type = SING; |
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| 54 | if (_LIB_VERSION == _POSIX_) |
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| 55 | errno = EDOM; |
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| 56 | else if (!matherr(&exc)) { |
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| 57 | errno = EDOM; |
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| 58 | } |
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| 59 | } else { |
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| 60 | /* gamma(finite) overflow */ |
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| 61 | exc.type = OVERFLOW; |
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| 62 | if (_LIB_VERSION == _POSIX_) |
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| 63 | errno = ERANGE; |
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| 64 | else if (!matherr(&exc)) { |
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| 65 | errno = ERANGE; |
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| 66 | } |
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| 67 | } |
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| 68 | if (exc.err != 0) |
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| 69 | errno = exc.err; |
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| 70 | return exc.retval; |
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| 71 | } else |
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| 72 | return y; |
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| 73 | #endif |
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| 74 | } |
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| 75 | |
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| 76 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
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