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[streambuf] Added call to traits_type::copy to common case in xsgetn()

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Patch by Laman Sole <laxman.g@partner.samsung.com>, Sebastian Pop
<s.pop@samsung.com>, Aditya Kumar <aditya.k7@samsung.com>

Differential Revision: http://reviews.llvm.org/D21103

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@272401 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evandro Menezes
2016-06-10 16:00:29 +00:00
parent 4241df3ef4
commit 42e8527d86
1 changed files with 12 additions and 2 deletions
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14
include/streambuf
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@@ -495,12 +495,22 @@ basic_streambuf<_CharT, _Traits>::xsgetn(char_type* __s, streamsize __n)
const int_type __eof = traits_type::eof(); const int_type __eof = traits_type::eof();
int_type __c; int_type __c;
streamsize __i = 0; streamsize __i = 0;
for (;__i < __n; ++__i, ++__s) while(__i < __n)
{ {
if (__ninp_ < __einp_) if (__ninp_ < __einp_)
*__s = *__ninp_++; {
const streamsize __len = _VSTD::min(__einp_ - __ninp_, __n - __i);
traits_type::copy(__s, __ninp_, __len);
__s += __len;
__i += __len;
this->gbump(__len);
}
else if ((__c = uflow()) != __eof) else if ((__c = uflow()) != __eof)
{
*__s = traits_type::to_char_type(__c); *__s = traits_type::to_char_type(__c);
++__s;
++__i;
}
else else
break; break;
} }