+#ifdef LLVM_ON_WIN32
+const char utf16le_text[] =
+ "\x6c\x00\x69\x00\x6e\x00\x67\x00\xfc\x00\x69\x00\xe7\x00\x61\x00";
+const char utf16be_text[] =
+ "\x00\x6c\x00\x69\x00\x6e\x00\x67\x00\xfc\x00\x69\x00\xe7\x00\x61";
+#endif
+const char utf8_text[] = "\x6c\x69\x6e\x67\xc3\xbc\x69\xc3\xa7\x61";
+
+TEST(ProgramTest, TestWriteWithSystemEncoding) {
+ SmallString<128> TestDirectory;
+ ASSERT_NO_ERROR(fs::createUniqueDirectory("program-test", TestDirectory));
+ errs() << "Test Directory: " << TestDirectory << '\n';
+ errs().flush();
+ SmallString<128> file_pathname(TestDirectory);
+ path::append(file_pathname, "international-file.txt");
+ // Only on Windows we should encode in UTF16. For other systems, use UTF8
+ ASSERT_NO_ERROR(sys::writeFileWithEncoding(file_pathname.c_str(), utf8_text,
+ sys::WEM_UTF16));
+ int fd = 0;
+ ASSERT_NO_ERROR(fs::openFileForRead(file_pathname.c_str(), fd));
+#if defined(LLVM_ON_WIN32)
+ char buf[18];
+ ASSERT_EQ(::read(fd, buf, 18), 18);
+ if (strncmp(buf, "\xfe\xff", 2) == 0) { // UTF16-BE
+ ASSERT_EQ(strncmp(&buf[2], utf16be_text, 16), 0);
+ } else if (strncmp(buf, "\xff\xfe", 2) == 0) { // UTF16-LE
+ ASSERT_EQ(strncmp(&buf[2], utf16le_text, 16), 0);
+ } else {
+ FAIL() << "Invalid BOM in UTF-16 file";
+ }
+#else
+ char buf[10];
+ ASSERT_EQ(::read(fd, buf, 10), 10);
+ ASSERT_EQ(strncmp(buf, utf8_text, 10), 0);
+#endif
+ ::close(fd);
+ ASSERT_NO_ERROR(fs::remove(file_pathname.str()));
+ ASSERT_NO_ERROR(fs::remove(TestDirectory.str()));
+}
+