type Macro struct {
	name   string   // The #define name.
	args   []string // Formal arguments.
	tokens []Token  // Body of macro.
}

// Tokenize turns a string into a list of Tokens; used to parse the -D flag and in tests.
func Tokenize(str string) []Token {
	t := NewTokenizer("command line", strings.NewReader(str), nil)
	var tokens []Token
	for {
		tok := t.Next()

	// Writes to f are only synchronized once Close() is called,
	// or when files are being rotated.
	f *os.File

	pw *xioutil.PipeWriter
	pr *xioutil.PipeReader
}

// Write writes p into the current file, rotating if necessary.
// Write is non-blocking, if the writer's queue is not full.
// Write is blocking otherwise.
func (w *Writer) Write(p []byte) (n int, err error) {
	return w.pw.Write(p)
}

	// Add the meta-uuid string, set to 1234
	uuidConditionStr := fmt.Sprintf(`["eq", "$x-amz-meta-uuid", "%s"]`, "1234")

	// Combine all conditions into one string.
	conditionStr := fmt.Sprintf(`"conditions":[%s, %s, %s, %s, %s, %s, %s]`, bucketConditionStr,
		keyConditionStr, contentLengthCondStr, algorithmConditionStr, dateConditionStr, credentialConditionStr, uuidConditionStr)

// scan modes
const (
	ScanInitialized         ScanMode = 1 << 0 // 1
	ScanUpdate              ScanMode = 1 << 1 // 2
	ScanOnConflictDoNothing ScanMode = 1 << 2 // 4
)

// Scan scan rows into db statement
func Scan(rows Rows, db *DB, mode ScanMode) {
	var (
		columns, _          = rows.Columns()
		values              = make([]interface{}, len(columns))
		initialized         = mode&ScanInitialized != 0

	// When a response is received, the mux is already removed from the remote.
	OpResponse

	// OpDisconnect instructs that remote wants to disconnect
	OpDisconnect

	// OpMerged is several operations merged into one.
	OpMerged
)

const (
	// FlagCRCxxh3 indicates that, the lower 32 bits of xxhash3 of the serialized
	// message will be sent after the serialized message as little endian.
	FlagCRCxxh3 Flags = 1 << iota

	if err != nil {
		return consumed, nil, typ, err
	}

	return consumed, nameBuf[:nameLen], typ, nil
}

// readDirFn applies the fn() function on each entries at dirPath, doesn't recurse into
// the directory itself, if the dirPath doesn't exist this function doesn't return
// an error.
func readDirFn(dirPath string, fn func(name string, typ os.FileMode) error) error {

	if !compareSignatureV2(signature, calculateSignatureV2(policy, cred.SecretKey)) {
		return cred, ErrSignatureDoesNotMatch
	}
	return cred, ErrNone
}

// Escape encodedQuery string into unescaped list of query params, returns error
// if any while unescaping the values.
func unescapeQueries(encodedQuery string) (unescapedQueries []string, err error) {
	for _, query := range strings.Split(encodedQuery, "&") {

					i++
				}
				continue
			}
			buf = append(buf, c)
		}

		f := strings.Fields(string(buf))

		// Turn relative (PC) into absolute (PC) automatically,
		// so that most branch instructions don't need comments
		// giving the absolute form.
		if len(f) > 0 && strings.Contains(printed, "(PC)") {
			index := len(f) - 1
			suf := "(PC)"

		// Without delimteter the code should recurse into the prefix Dir.
		// Tests with prefix, but without delimiter (53-54).
		{"test-bucket-list-object", "Asia/India/", "", "", 10, resultCases[23], nil, true},
		{"test-bucket-list-object", "Asia", "", "", 10, resultCases[24], nil, true},
		// Tests with prefix and delimiter (55-57).
		// With delimiter the code should not recurse into the sub-directories of prefix Dir.

	policies := make(map[string]MappedPolicy, m.Size())
	m.Range(func(k string, v MappedPolicy) bool {
		policies[k] = v
		return true
	})
	return policies
}

// converts a mapped policy into a slice of distinct policies
func (mp MappedPolicy) toSlice() []string {
	var policies []string
	for _, policy := range strings.Split(mp.Policies, ",") {
		if strings.TrimSpace(policy) == "" {
			continue
		}