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* missing/xlgamma_r.c (lgamma_r): return HUGE_VAL for non-positive

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integers.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@15411 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2008-02-09 02:10:57 +00:00
parent 8f9fb1a820
commit 4c351aea17
2 changed files with 10 additions and 4 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sat Feb 9 11:09:26 2008 Tanaka Akira <akr@fsij.org>
* missing/xlgamma_r.c (lgamma_r): return HUGE_VAL for non-positive
integers.
Sat Feb 9 10:03:07 2008 Tanaka Akira <akr@fsij.org>
* string.c (rb_str_new4): copy encoding from orig, instead of shared

9
missing/lgamma_r.c
View file

@ -12,6 +12,7 @@ reference - Haruhiko Okumura: C-gengo niyoru saishin algorithm jiten
gamma.c -- Gamma function
***********************************************************/
#include <math.h>
#include <errno.h>
#define PI 3.14159265358979324 /* $\pi$ */
#define LOG_2PI 1.83787706640934548 /* $\log 2\pi$ */
#define LOG_PI 1.14472988584940017 /* $\log_e \pi$ */
@ -47,13 +48,13 @@ loggamma(double x) /* the natural logarithm of the Gamma function. */
double
lgamma_r(double x, int *signp)
{
if (x < 0) {
if (x <= 0) {
double i, f, s;
f = modf(-x, &i);
if (f == 0.0) {
static const double zero = 0.0;
if (f == 0.0) { /* pole error */
*signp = 1;
return 1.0/zero;
errno = ERANGE;
return HUGE_VAL;
}
*signp = (fmod(i, 2.0) != 0.0) ? 1 : -1;
s = sin(PI * f);