59b19ff14a
- float ynf(int n, float x) /* wrapper ynf */ +float +ynf(int n, float x) /* wrapper ynf */ This is because the __STDC__ stuff was indented. Reviewed by: md5
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/* @(#)w_gamma.c 5.1 93/09/24 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#ifndef lint
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static char rcsid[] = "$FreeBSD$";
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#endif
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/* double gamma(double x)
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* Return the logarithm of the Gamma function of x.
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*
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* Method: call gamma_r
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*/
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#include "math.h"
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#include "math_private.h"
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extern int signgam;
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double
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gamma(double x)
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{
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#ifdef _IEEE_LIBM
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return __ieee754_gamma_r(x,&signgam);
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#else
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double y;
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y = __ieee754_gamma_r(x,&signgam);
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if(_LIB_VERSION == _IEEE_) return y;
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if(!finite(y)&&finite(x)) {
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if(floor(x)==x&&x<=0.0)
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return __kernel_standard(x,x,41); /* gamma pole */
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else
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return __kernel_standard(x,x,40); /* gamma overflow */
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} else
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return y;
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#endif
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}
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