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Prevent '\b' from backing up into invalid memory. Fixes http://llvm.org/bugs/show_bug.cgi?id=16240. Sorry, I can not think of a good test case for this one, except by running valgrind as reported in the bug. 

llvm-svn: 185273
This commit is contained in:
Howard Hinnant 2013-06-29 23:45:43 +00:00
parent 7a69d2c06a
commit 660f2ae422
1 changed files with 25 additions and 1 deletions
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26
libcxx/include/regex
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@ -2843,6 +2843,15 @@ private:
const basic_regex<_Cp, _Tp>& __e,
regex_constants::match_flag_type __flags);
template <class _Iter, class _Ap, class _Cp, class _Tp>
friend
bool
regex_search(__wrap_iter<_Iter> __first,
__wrap_iter<_Iter> __last,
match_results<__wrap_iter<_Iter>, _Ap>& __m,
const basic_regex<_Cp, _Tp>& __e,
regex_constants::match_flag_type __flags);
template <class, class> friend class __lookahead;
};
@ -5808,6 +5817,21 @@ regex_search(_BidirectionalIterator __first, _BidirectionalIterator __last,
return __r;
}
template <class _Iter, class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
regex_search(__wrap_iter<_Iter> __first,
__wrap_iter<_Iter> __last,
match_results<__wrap_iter<_Iter>, _Allocator>& __m,
const basic_regex<_CharT, _Traits>& __e,
regex_constants::match_flag_type __flags = regex_constants::match_default)
{
match_results<const _CharT*> __mc;
bool __r = __e.__search(__first.base(), __last.base(), __mc, __flags);
__m.__assign(__first, __last, __mc, __flags & regex_constants::__no_update_pos);
return __r;
}
template <class _Allocator, class _CharT, class _Traits>
inline _LIBCPP_INLINE_VISIBILITY
bool
@ -6045,7 +6069,7 @@ regex_iterator<_BidirectionalIterator, _CharT, _Traits>::operator++()
{
__flags_ |= regex_constants::__no_update_pos;
_BidirectionalIterator __start = __match_[0].second;
if (__match_.length() == 0)
if (__match_.empty())
{
if (__start == __end_)
{