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Don't call memmove when there's nothing to move. Fixes PR#27978.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@271794 91177308-0d34-0410-b5e6-96231b3b80d8
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Marshall Clow
2016-06-04 16:16:59 +00:00
parent 1575e3e813
commit 2700619520
1 changed files with 3 additions and 1 deletions
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4
include/fstream
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@@ -606,7 +606,9 @@ basic_filebuf<_CharT, _Traits>::underflow()
} }
else else
{ {
memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_); _LIBCPP_ASSERT ( !(__extbufnext_ == NULL && (__extbufend_ != __extbufnext_)), "underflow moving from NULL" );
if (__extbufend_ != __extbufnext_)
memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
__extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_); __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
__extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_); __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);
size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz), size_t __nmemb = _VSTD::min(static_cast<size_t>(__ibs_ - __unget_sz),