* Normally used as a C string terminator.
   *
   * <p>Although RFC 20 names this as "Null", note that it is distinct from the C/C++ "NULL"
   * pointer.
   *
   * @since 8.0
   */
  public static final byte NUL = 0;

  /**
   * Start of Heading: A communication control character used at the beginning of a sequence of
   * characters which constitute a machine-sensible address or routing information. Such a sequence

// compared by value with the string object.  If the value is a char
// pointer but the other operand is not an STL string object, we don't
// know whether the pointer is supposed to point to a NUL-terminated
// string, and thus want to print it as a pointer to be safe.
//
// INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.

// The default case.
template <typename ToPrint, typename OtherOperand>

// compared by value with the string object.  If the value is a char
// pointer but the other operand is not an STL string object, we don't
// know whether the pointer is supposed to point to a NUL-terminated
// string, and thus want to print it as a pointer to be safe.
//
// INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.

// The default case.
template <typename ToPrint, typename OtherOperand>

		s.offset = s.rdOffset
		if s.ch == '\n' {
			s.lineOffset = s.offset
			s.file.AddLine(s.offset)
		}
		r, w := rune(s.src[s.rdOffset]), 1
		switch {
		case r == 0:
			s.error(s.offset, "illegal character NUL")
		case r >= utf8.RuneSelf:
			// not ASCII
			r, w = utf8.DecodeRune(s.src[s.rdOffset:])
			if r == utf8.RuneError && w == 1 {
				s.error(s.offset, "illegal UTF-8 encoding")
			} else if r == bom && s.offset > 0 {

			return nil // No edit needed.
		}
	}
	// Remove existing contents, so that when we truncate to the actual size it will zero-fill,
	// and we will be able to detect (some) incomplete writes as files containing trailing NUL bytes.
	if err := f.Truncate(0); err != nil {
		return err
	}
	// Reserve the final size and zero-fill.
	if err := f.Truncate(int64(buf.Len())); err != nil {
		return err
	}

// pointer to a struct:
//
//	struct {
//		PC      uintptr // program counter to fetch information for
//		File    *byte   // file name (NUL terminated)
//		Lineno  uintptr // line number
//		Func    *byte   // function name (NUL terminated)
//		Entry   uintptr // function entry point
//		More    uintptr // set non-zero if more info for this PC

		}

		// The prefix field should never appear in the GNU format.
		var blk block
		copy(blk[:], b.Bytes())
		prefix := string(blk.toUSTAR().prefix())
		prefix, _, _ = strings.Cut(prefix, "\x00") // Truncate at the NUL terminator
		if blk.getFormat() == FormatGNU && len(prefix) > 0 && strings.HasPrefix(name, prefix) {
			t.Errorf("test %d, found prefix in GNU format: %s", i, prefix)
		}

		tr := NewReader(&b)
		hdr, err := tr.Next()

	GOMOD
		The absolute path to the go.mod of the main module.
		If module-aware mode is enabled, but there is no go.mod, GOMOD will be
		os.DevNull ("/dev/null" on Unix-like systems, "NUL" on Windows).
		If module-aware mode is disabled, GOMOD will be the empty string.
	GOTOOLDIR
		The directory where the go tools (compile, cover, doc, etc...) are installed.
	GOVERSION

	dst.FileSizeHigh = src.FileSizeHigh
	dst.FileSizeLow = src.FileSizeLow
	dst.Reserved0 = src.Reserved0
	dst.Reserved1 = src.Reserved1

	// The src is 1 element bigger than dst, but it must be NUL.
	copy(dst.FileName[:], src.FileName[:])
	copy(dst.AlternateFileName[:], src.AlternateFileName[:])
}

type ByHandleFileInformation struct {
	FileAttributes     uint32
	CreationTime       Filetime

func testFileServerNamesEscape(t *testing.T, mode testMode) {
	ts := newClientServerTest(t, mode, FileServer(Dir("testdata"))).ts
	for _, path := range []string{
		"/../testdata/file",
		"/NUL", // don't read from device files on Windows
	} {
		res, err := ts.Client().Get(ts.URL + path)
		if err != nil {
			t.Fatal(err)
		}
		res.Body.Close()
		if res.StatusCode < 400 || res.StatusCode > 599 {