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[libc++] Avoid calling setlocale in do_unshift when unnecessary #117153

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[libc++] Avoid calling setlocale in do_unshift when unnecessary #117153

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2 changes: 2 additions & 0 deletions libcxx/src/locale.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1475,6 +1475,8 @@ codecvt<wchar_t, char, mbstate_t>::result codecvt<wchar_t, char, mbstate_t>::do_
codecvt<wchar_t, char, mbstate_t>::result codecvt<wchar_t, char, mbstate_t>::do_unshift(
state_type& st, extern_type* to, extern_type* to_end, extern_type*& to_nxt) const {
to_nxt = to;
if (std::mbsinit(&st))
return ok;
extern_type tmp[MB_LEN_MAX];
size_t n = __locale::__wcrtomb(tmp, intern_type(), &st, __l_);
if (n == size_t(-1) || n == 0) // on error
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