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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
This commit is contained in:
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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include/fstream
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@@ -606,6 +606,8 @@ basic_filebuf<_CharT, _Traits>::underflow()
}
else
{
_LIBCPP_ASSERT ( !(__extbufnext_ == NULL && (__extbufend_ != __extbufnext_)), "underflow moving from NULL" );
if (__extbufend_ != __extbufnext_)
memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_);
__extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_);
__extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_);