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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/wchar_t/9875_seekoff.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/wchar_t/9875_seekoff.cc
new file mode 100644
index 00000000..312386a2
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/wchar_t/9875_seekoff.cc
@@ -0,0 +1,99 @@
+// Copyright (C) 2003, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// .
+
+// 27.8.1.4 Overridden virtual functions
+
+#include
+#include
+#include
+#include
+#include
+
+class Cvt : public std::codecvt
+{
+protected:
+ virtual std::codecvt_base::result
+ do_out(std::mbstate_t&, const wchar_t* from, const wchar_t* from_end,
+ const wchar_t*& from_next, char* to, char* to_end,
+ char*& to_next) const
+ {
+ std::size_t from_len = from_end - from;
+ std::size_t to_len = (to_end - to) / sizeof(wchar_t);
+ std::size_t len = std::min(from_len, to_len);
+ std::memcpy(to, from, len * sizeof(wchar_t));
+ from_next = from + len;
+ to_next = to + len * sizeof(wchar_t);
+ return from_next == from_end ? std::codecvt_base::ok :
+ std::codecvt_base::partial;
+ }
+
+ virtual std::codecvt_base::result
+ do_in(std::mbstate_t&, const char* from, const char* from_end,
+ const char*& from_next, wchar_t* to, wchar_t* to_end,
+ wchar_t*& to_next) const
+ {
+ std::size_t from_len =
+ (from_end - from) / sizeof(wchar_t);
+ std::size_t to_len = to_end - to;
+ std::size_t len = std::min(from_len, to_len);
+ std::memcpy(to, from, len * sizeof(wchar_t));
+ from_next = from + len * sizeof(wchar_t);
+ to_next = to + len;
+ return from_next == from_end ? std::codecvt_base::ok :
+ std::codecvt_base::partial;
+ }
+
+ virtual std::codecvt_base::result
+ do_unshift(std::mbstate_t&, char*, char*, char*&) const
+ { return std::codecvt_base::noconv; }
+
+ virtual int do_encoding() const throw() { return sizeof(wchar_t); }
+ virtual bool do_always_noconv() const throw() { return false; }
+
+ virtual int
+ do_length(std::mbstate_t&, const char* from, const char* end,
+ std::size_t max)
+ {
+ std::size_t len = (end - from) / sizeof(wchar_t);
+ return std::min(len, max) * sizeof(wchar_t);
+ }
+
+ virtual int do_max_length() const throw() { return sizeof(wchar_t); }
+};
+
+void test01()
+{
+ using namespace std;
+ bool test __attribute__((unused)) = true;
+
+ // seekoff
+ wfilebuf fb;
+ fb.pubimbue(locale(locale::classic(), new Cvt));
+ fb.open("tmp_9875_seekoff", ios_base::out | ios_base::in | ios_base::trunc);
+ fb.sputn(L"0123456789", 10);
+ fb.pubseekoff(-3, ios_base::cur);
+ VERIFY( fb.sgetc() == L'7' );
+ fb.pubseekoff(-3, ios_base::cur);
+ VERIFY( fb.sgetc() == L'4' );
+ fb.close();
+}
+
+int main()
+{
+ test01();
+ return 0;
+}