diff options
| author | Sergey Cherkashin <4erkashin@list.ru> | 2017-10-03 15:26:34 +0300 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2017-11-03 20:23:10 +0100 |
| commit | ea38f4d89c9698895b1cf53a5946429dc1d8bbaa (patch) | |
| tree | e05828ca1fedf55f104b837bc9c44215c2978e99 /libm/w_lgamma.c | |
| parent | 68de9946e914d8c30dcc6667a059ea59e5b74cac (diff) | |
math: add exception handling functionality
According to standards SVID and SYSV.
Modified lgamma calling in case when 'signgam' variable should not be used.
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
Diffstat (limited to 'libm/w_lgamma.c')
| -rw-r--r-- | libm/w_lgamma.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/libm/w_lgamma.c b/libm/w_lgamma.c new file mode 100644 index 000000000..d2fb88dcb --- /dev/null +++ b/libm/w_lgamma.c @@ -0,0 +1,37 @@ +/* @(#)w_lgamma.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +/* double lgamma(double x) + * Return the logarithm of the Gamma function of x. + * + * Method: call __ieee754_lgamma_r + */ + +#include <math.h> +#include "math_private.h" + +double +lgamma(double x) +{ + return lgamma_r(x, &signgam); +} + +libm_hidden_def(lgamma) + +/* NB: gamma function is an old name for lgamma. + * It is deprecated. + * Some C math libraries redefine it as a "true gamma", i.e., + * not a ln(|Gamma(x)|) but just Gamma(x), but standards + * introduced tgamma name for that. + */ +strong_alias(lgamma, gamma) +libm_hidden_def(gamma)
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