1 files changed, 58 insertions, 0 deletions
diff --git a/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
new file mode 100644
index 00000000000..aa9d5e8a95e
--- /dev/null
+++ b/libcxx/test/std/localization/locales/locale.convenience/conversions/conversions.buffer/seekoff.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <locale>
+
+// wbuffer_convert<Codecvt, Elem, Tr>
+
+// pos_type seekoff(off_type off, ios_base::seekdir way,
+//                  ios_base::openmode which = ios_base::in | ios_base::out);
+// pos_type seekpos(pos_type sp,
+//                  ios_base::openmode which = ios_base::in | ios_base::out);
+
+// This test is not entirely portable
+
+#include <locale>
+#include <codecvt>
+#include <fstream>
+#include <cassert>
+
+class test_codecvt
+    : public std::codecvt<wchar_t, char, std::mbstate_t>
+{
+    typedef std::codecvt<wchar_t, char, std::mbstate_t> base;
+public:
+    explicit test_codecvt(std::size_t refs = 0) : base(refs) {}
+    ~test_codecvt() {}
+};
+
+int main()
+{
+    {
+        wchar_t buf[10];
+        typedef std::wbuffer_convert<test_codecvt> test_buf;
+        typedef test_buf::pos_type pos_type;
+        std::fstream bs("seekoff.dat", std::ios::trunc | std::ios::in
+                                                       | std::ios::out);
+        test_buf f(bs.rdbuf());
+        f.pubsetbuf(buf, sizeof(buf)/sizeof(buf[0]));
+        f.sputn(L"abcdefghijklmnopqrstuvwxyz", 26);
+        assert(buf[0] == L'v');
+        pos_type p = f.pubseekoff(-15, std::ios_base::cur);
+        assert(p == 11);
+        assert(f.sgetc() == L'l');
+        f.pubseekoff(0, std::ios_base::beg);
+        assert(f.sgetc() == L'a');
+        f.pubseekoff(-1, std::ios_base::end);
+        assert(f.sgetc() == L'z');
+        assert(f.pubseekpos(p) == p);
+        assert(f.sgetc() == L'l');
+    }
+    std::remove("seekoff.dat");
+}