Overloaded __pad_and_output on ostreambuf_iterator and in this overload call sputn instead of dereferencing the iterator which calls sputc. This is intended to be purely a performance optimization, especially for clients who may have overloaded the virtual function xsputn. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@164241 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/iterator b/include/iterator index 167db52..9b65608 100644 --- a/include/iterator +++ b/include/iterator
@@ -881,6 +881,14 @@ _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++() {return *this;} _LIBCPP_INLINE_VISIBILITY ostreambuf_iterator& operator++(int) {return *this;} _LIBCPP_INLINE_VISIBILITY bool failed() const _NOEXCEPT {return __sbuf_ == 0;} + + template <class _Ch, class _Tr> + friend + _LIBCPP_HIDDEN + ostreambuf_iterator<_Ch, _Tr> + __pad_and_output(ostreambuf_iterator<_Ch, _Tr> __s, + const _Ch* __ob, const _Ch* __op, const _Ch* __oe, + ios_base& __iob, _Ch __fl); }; template <class _Iter> diff --git a/include/locale b/include/locale index ee0a6a0..0d77a4a 100644 --- a/include/locale +++ b/include/locale
@@ -1587,6 +1587,52 @@ return __s; } +template <class _CharT, class _Traits> +_LIBCPP_HIDDEN +ostreambuf_iterator<_CharT, _Traits> +__pad_and_output(ostreambuf_iterator<_CharT, _Traits> __s, + const _CharT* __ob, const _CharT* __op, const _CharT* __oe, + ios_base& __iob, _CharT __fl) +{ + if (__s.__sbuf_ == nullptr) + return __s; + streamsize __sz = __oe - __ob; + streamsize __ns = __iob.width(); + if (__ns > __sz) + __ns -= __sz; + else + __ns = 0; + streamsize __np = __op - __ob; + if (__np > 0) + { + if (__s.__sbuf_->sputn(__ob, __np) != __np) + { + __s.__sbuf_ = nullptr; + return __s; + } + } + if (__ns > 0) + { + basic_string<_CharT, _Traits> __sp(__ns, __fl); + if (__s.__sbuf_->sputn(__sp.data(), __ns) != __ns) + { + __s.__sbuf_ = nullptr; + return __s; + } + } + __np = __oe - __op; + if (__np > 0) + { + if (__s.__sbuf_->sputn(__op, __np) != __np) + { + __s.__sbuf_ = nullptr; + return __s; + } + } + __iob.width(0); + return __s; +} + template <class _CharT, class _OutputIterator> _OutputIterator num_put<_CharT, _OutputIterator>::do_put(iter_type __s, ios_base& __iob, 