| 1 | |
|---|
| 2 | /* @(#)wr_lgamma.c 5.1 93/09/24 */ |
|---|
| 3 | /* |
|---|
| 4 | * ==================================================== |
|---|
| 5 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
|---|
| 6 | * |
|---|
| 7 | * Developed at SunPro, 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 double lgamma_r(double x, int *signgamp) |
|---|
| 16 | */ |
|---|
| 17 | |
|---|
| 18 | #include "fdlibm.h" |
|---|
| 19 | #include <errno.h> |
|---|
| 20 | |
|---|
| 21 | #ifndef _DOUBLE_IS_32BITS |
|---|
| 22 | |
|---|
| 23 | #ifdef __STDC__ |
|---|
| 24 | double lgamma_r(double x, int *signgamp) /* wrapper lgamma_r */ |
|---|
| 25 | #else |
|---|
| 26 | double lgamma_r(x,signgamp) /* wrapper lgamma_r */ |
|---|
| 27 | double x; int *signgamp; |
|---|
| 28 | #endif |
|---|
| 29 | { |
|---|
| 30 | #ifdef _IEEE_LIBM |
|---|
| 31 | return __ieee754_lgamma_r(x,signgamp); |
|---|
| 32 | #else |
|---|
| 33 | double y; |
|---|
| 34 | struct exception exc; |
|---|
| 35 | y = __ieee754_lgamma_r(x,signgamp); |
|---|
| 36 | if(_LIB_VERSION == _IEEE_) return y; |
|---|
| 37 | if(!finite(y)&&finite(x)) { |
|---|
| 38 | #ifndef HUGE_VAL |
|---|
| 39 | #define HUGE_VAL inf |
|---|
| 40 | double inf = 0.0; |
|---|
| 41 | |
|---|
| 42 | SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ |
|---|
| 43 | #endif |
|---|
| 44 | exc.name = "lgamma"; |
|---|
| 45 | exc.err = 0; |
|---|
| 46 | exc.arg1 = exc.arg2 = (double)x; |
|---|
| 47 | if (_LIB_VERSION == _SVID_) |
|---|
| 48 | exc.retval = HUGE; |
|---|
| 49 | else |
|---|
| 50 | exc.retval = HUGE_VAL; |
|---|
| 51 | if(floor(x)==x&&x<=0.0) { |
|---|
| 52 | /* lgamma(-integer) */ |
|---|
| 53 | exc.type = SING; |
|---|
| 54 | if (_LIB_VERSION == _POSIX_) |
|---|
| 55 | errno = EDOM; |
|---|
| 56 | else if (!matherr(&exc)) { |
|---|
| 57 | errno = EDOM; |
|---|
| 58 | } |
|---|
| 59 | |
|---|
| 60 | } else { |
|---|
| 61 | /* lgamma(finite) overflow */ |
|---|
| 62 | exc.type = OVERFLOW; |
|---|
| 63 | if (_LIB_VERSION == _POSIX_) |
|---|
| 64 | errno = ERANGE; |
|---|
| 65 | else if (!matherr(&exc)) { |
|---|
| 66 | errno = ERANGE; |
|---|
| 67 | } |
|---|
| 68 | } |
|---|
| 69 | if (exc.err != 0) |
|---|
| 70 | errno = exc.err; |
|---|
| 71 | return exc.retval; |
|---|
| 72 | } else |
|---|
| 73 | return y; |
|---|
| 74 | #endif |
|---|
| 75 | } |
|---|
| 76 | |
|---|
| 77 | #endif /* defined(_DOUBLE_IS_32BITS) */ |
|---|
