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bigdecimal.c: check underflow

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* ext/bigdecimal/bigdecimal.c (BigDecimal_to_f): check underflow since
  strtod() sets errno to ERANGE at underflow too.  [ruby-core:47342]
  [Bug #6944]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2012-08-30 07:17:56 +00:00
parent aa7dc0f305
commit d7ca01a73a
3 changed files with 36 additions and 8 deletions
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6
ChangeLog
View file

@ -1,3 +1,9 @@
Thu Aug 30 16:17:52 2012 Nobuyoshi Nakada <nobu@ruby-lang.org>
* ext/bigdecimal/bigdecimal.c (BigDecimal_to_f): check underflow since
strtod() sets errno to ERANGE at underflow too. [ruby-core:47342]
[Bug #6944]
Thu Aug 30 12:44:43 2012 Akinori MUSHA <knu@iDaemons.org>
* lib/set.rb (Set#{<,>,<=,>=}): Define comparison operators as

6
ext/bigdecimal/bigdecimal.c
View file

@ -696,8 +696,10 @@ BigDecimal_to_f(VALUE self)
VpToString(p, buf, 0, 0);
errno = 0;
d = strtod(buf, 0);
if (errno == ERANGE)
goto overflow;
if (errno == ERANGE) {
if (d == 0.0) goto underflow;
if (fabs(d) >= HUGE_VAL) goto overflow;
}
return rb_float_new(d);
overflow:

32
test/bigdecimal/test_bigdecimal.rb
View file

@ -540,15 +540,35 @@ class TestBigDecimal < Test::Unit::TestCase
assert_kind_of(Float, x .to_f)
assert_kind_of(Float, (-x).to_f)
bug6944 = '[ruby-core:47342]'
BigDecimal.mode(BigDecimal::EXCEPTION_UNDERFLOW, true)
assert_raise(FloatDomainError) {
BigDecimal("1e#{Float::MIN_10_EXP - 2*Float::DIG}").to_f }
assert_raise(FloatDomainError) {
BigDecimal("-1e#{Float::MIN_10_EXP - 2*Float::DIG}").to_f }
x = "1e#{Float::MIN_10_EXP - 2*Float::DIG}"
assert_raise(FloatDomainError, x) {BigDecimal(x).to_f}
x = "-#{x}"
assert_raise(FloatDomainError, x) {BigDecimal(x).to_f}
x = "1e#{Float::MIN_10_EXP - Float::DIG}"
assert_nothing_raised(FloatDomainError, x) {
assert_in_delta(0.0, BigDecimal(x).to_f, 10**Float::MIN_10_EXP, bug6944)
}
x = "-#{x}"
assert_nothing_raised(FloatDomainError, x) {
assert_in_delta(0.0, BigDecimal(x).to_f, 10**Float::MIN_10_EXP, bug6944)
}
BigDecimal.mode(BigDecimal::EXCEPTION_UNDERFLOW, false)
assert_equal( 0.0, BigDecimal("1e#{Float::MIN_10_EXP - 2*Float::DIG}").to_f)
assert_equal(-0.0, BigDecimal("-1e#{Float::MIN_10_EXP - 2*Float::DIG}").to_f)
x = "1e#{Float::MIN_10_EXP - 2*Float::DIG}"
assert_equal( 0.0, BigDecimal(x).to_f, x)
x = "-#{x}"
assert_equal(-0.0, BigDecimal(x).to_f, x)
x = "1e#{Float::MIN_10_EXP - Float::DIG}"
assert_nothing_raised(FloatDomainError, x) {
assert_in_delta(0.0, BigDecimal(x).to_f, 10**Float::MIN_10_EXP, bug6944)
}
x = "-#{x}"
assert_nothing_raised(FloatDomainError, x) {
assert_in_delta(0.0, BigDecimal(x).to_f, 10**Float::MIN_10_EXP, bug6944)
}
end
def test_coerce