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rational.c: infinity in power

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* rational.c (nurat_expt): return 0 due to overflow.
  [ruby-core:79686] [Bug #13242]:

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57689 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2017-02-22 23:49:40 +00:00
parent 06010b2b05
commit 2e2063fe16
2 changed files with 6 additions and 0 deletions
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4
rational.c
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@ -1046,6 +1046,10 @@ nurat_expt(VALUE self, VALUE other)
if (RB_FLOAT_TYPE_P(den)) return DBL2NUM(NAN);
return num;
}
if (RB_FLOAT_TYPE_P(den)) { /* infinity due to overflow */
num = ZERO;
den = ONE;
}
return f_rational_new2(CLASS_OF(self), num, den);
}
}

2
test/ruby/test_rational.rb
View file

@ -959,6 +959,8 @@ class Rational_Test < Test::Unit::TestCase
bug = '[ruby-core:79686] [Bug #13242]: Infinity due to overflow'
x = EnvUtil.suppress_warning {4r**40000000}
assert_predicate x, :infinite?, bug
x = EnvUtil.suppress_warning {(1/4r)**40000000}
assert_equal 0, x, bug
end
def test_positive_p