1 files changed, 81 insertions, 0 deletions
diff --git a/src/os/dir_plan9.go b/src/os/dir_plan9.go
new file mode 100644
index 0000000..8f6b0d6
--- /dev/null
+++ b/src/os/dir_plan9.go
@@ -0,0 +1,81 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import (
+	"io"
+	"syscall"
+)
+
+func (file *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
+	// If this file has no dirinfo, create one.
+	if file.dirinfo == nil {
+		file.dirinfo = new(dirInfo)
+	}
+	d := file.dirinfo
+	size := n
+	if size <= 0 {
+		size = 100
+		n = -1
+	}
+	for n != 0 {
+		// Refill the buffer if necessary.
+		if d.bufp >= d.nbuf {
+			nb, err := file.Read(d.buf[:])
+
+			// Update the buffer state before checking for errors.
+			d.bufp, d.nbuf = 0, nb
+
+			if err != nil {
+				if err == io.EOF {
+					break
+				}
+				return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: err}
+			}
+			if nb < syscall.STATFIXLEN {
+				return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: syscall.ErrShortStat}
+			}
+		}
+
+		// Get a record from the buffer.
+		b := d.buf[d.bufp:]
+		m := int(uint16(b[0])|uint16(b[1])<<8) + 2
+		if m < syscall.STATFIXLEN {
+			return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: syscall.ErrShortStat}
+		}
+
+		dir, err := syscall.UnmarshalDir(b[:m])
+		if err != nil {
+			return names, dirents, infos, &PathError{Op: "readdir", Path: file.name, Err: err}
+		}
+
+		if mode == readdirName {
+			names = append(names, dir.Name)
+		} else {
+			f := fileInfoFromStat(dir)
+			if mode == readdirDirEntry {
+				dirents = append(dirents, dirEntry{f})
+			} else {
+				infos = append(infos, f)
+			}
+		}
+		d.bufp += m
+		n--
+	}
+
+	if n > 0 && len(names)+len(dirents)+len(infos) == 0 {
+		return nil, nil, nil, io.EOF
+	}
+	return names, dirents, infos, nil
+}
+
+type dirEntry struct {
+	fs *fileStat
+}
+
+func (de dirEntry) Name() string            { return de.fs.Name() }
+func (de dirEntry) IsDir() bool             { return de.fs.IsDir() }
+func (de dirEntry) Type() FileMode          { return de.fs.Mode().Type() }
+func (de dirEntry) Info() (FileInfo, error) { return de.fs, nil }