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math.c: check argument to tgamma

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* math.c (math_gamma): check the argument before calling math
  function `tgamma` for edge cases.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58697 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-05-13 00:50:20 +00:00
parent 94a7a4e908
commit 1a4a536247
2 changed files with 7 additions and 2 deletions
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1
configure.in
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@ -1317,7 +1317,6 @@ main()
ac_cv_func___builtin_setjmp=no
ac_cv_func_round=no
])
ac_cv_func_tgamma=no
AC_CHECK_TYPE([NET_LUID], [], [],
[@%:@include <winsock2.h>
@%:@include <iphlpapi.h>])

8
math.c
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@ -869,7 +869,13 @@ math_gamma(VALUE unused_obj, VALUE x)
double d;
d = Get_Double(x);
/* check for domain error */
if (isinf(d) && signbit(d)) domain_error("gamma");
if (isinf(d)) {
if (signbit(d)) domain_error("gamma");
return DBL2NUM(INFINITY);
}
if (d == 0.0) {
return signbit(d) ? DBL2NUM(-INFINITY) : DBL2NUM(INFINITY);
}
if (d == floor(d)) {
if (d < 0.0) domain_error("gamma");
if (1.0 <= d && d <= (double)NFACT_TABLE) {