generic-library/cxx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Make basic_streambuf::xsputn write characters in chunks whenever possible, instead of one at a time. References PR#10193

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@229866 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow 2015-02-19 16:17:46 +00:00
parent 784fa1eeba
commit 6b5a5e52f0
1 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
include/streambuf
View File

@ -536,12 +536,23 @@ basic_streambuf<_CharT, _Traits>::xsputn(const char_type* __s, streamsize __n)
{ {
streamsize __i = 0; streamsize __i = 0;
int_type __eof = traits_type::eof(); int_type __eof = traits_type::eof();
for (; __i < __n; ++__s, ++__i) while( __i < __n)
{ {
if (__nout_ < __eout_) if (__nout_ >= __eout_)
*__nout_++ = *__s; {
else if (overflow(traits_type::to_int_type(*__s)) == __eof) if (overflow(traits_type::to_int_type(*__s)) == __eof)
break; break;
++__s;
++__i;
}
else
{
streamsize __chunk_size = _VSTD::min(__eout_ - __nout_, __n - __i);
traits_type::copy(__nout_, __s, __chunk_size);
__nout_ += __chunk_size;
__s += __chunk_size;
__i += __chunk_size;
}
} }
return __i; return __i;
} }