108 lines
2.9 KiB
Go
108 lines
2.9 KiB
Go
package vfs
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import (
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"io"
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"os"
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)
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// DirHandle represents an open directory
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type DirHandle struct {
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baseHandle
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d *Dir
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fis []os.FileInfo // where Readdir got to
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}
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// newDirHandle opens a directory for read
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func newDirHandle(d *Dir) *DirHandle {
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return &DirHandle{
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d: d,
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}
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}
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// String converts it to printable
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func (fh *DirHandle) String() string {
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if fh == nil {
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return "<nil *DirHandle>"
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}
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if fh.d == nil {
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return "<nil *DirHandle.d>"
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}
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return fh.d.String() + " (r)"
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}
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// Stat returns info about the current directory
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func (fh *DirHandle) Stat() (fi os.FileInfo, err error) {
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return fh.d, nil
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}
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// Node returns the Node assocuated with this - satisfies Noder interface
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func (fh *DirHandle) Node() Node {
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return fh.d
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}
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// Readdir reads the contents of the directory associated with file and returns
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// a slice of up to n FileInfo values, as would be returned by Lstat, in
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// directory order. Subsequent calls on the same file will yield further
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// FileInfos.
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//
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// If n > 0, Readdir returns at most n FileInfo structures. In this case, if
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// Readdir returns an empty slice, it will return a non-nil error explaining
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// why. At the end of a directory, the error is io.EOF.
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//
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// If n <= 0, Readdir returns all the FileInfo from the directory in a single
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// slice. In this case, if Readdir succeeds (reads all the way to the end of
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// the directory), it returns the slice and a nil error. If it encounters an
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// error before the end of the directory, Readdir returns the FileInfo read
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// until that point and a non-nil error.
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func (fh *DirHandle) Readdir(n int) (fis []os.FileInfo, err error) {
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if fh.fis == nil {
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nodes, err := fh.d.ReadDirAll()
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if err != nil {
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return nil, err
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}
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fh.fis = []os.FileInfo{}
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for _, node := range nodes {
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fh.fis = append(fh.fis, node)
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}
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}
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nn := len(fh.fis)
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if n > 0 {
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if nn == 0 {
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return nil, io.EOF
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}
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if nn > n {
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nn = n
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}
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}
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fis, fh.fis = fh.fis[:nn], fh.fis[nn:]
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return fis, nil
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}
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// Readdirnames reads and returns a slice of names from the directory f.
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//
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// If n > 0, Readdirnames returns at most n names. In this case, if
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// Readdirnames returns an empty slice, it will return a non-nil error
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// explaining why. At the end of a directory, the error is io.EOF.
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//
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// If n <= 0, Readdirnames returns all the names from the directory in a single
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// slice. In this case, if Readdirnames succeeds (reads all the way to the end
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// of the directory), it returns the slice and a nil error. If it encounters an
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// error before the end of the directory, Readdirnames returns the names read
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// until that point and a non-nil error.
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func (fh *DirHandle) Readdirnames(n int) (names []string, err error) {
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nodes, err := fh.Readdir(n)
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if err != nil {
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return nil, err
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}
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for _, node := range nodes {
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names = append(names, node.Name())
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}
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return names, nil
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}
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// Close closes the handle
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func (fh *DirHandle) Close() (err error) {
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fh.fis = nil
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return nil
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}
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