1 files changed, 73 insertions, 0 deletions
diff --git a/src/os/dir_plan9.go b/src/os/dir_plan9.go
new file mode 100644
index 000000000..8195c02a4
--- /dev/null
+++ b/src/os/dir_plan9.go
@@ -0,0 +1,73 @@
+// 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) ([]FileInfo, 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
+	}
+	fi := make([]FileInfo, 0, size) // Empty with room to grow.
+	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 fi, &PathError{"readdir", file.name, err}
+			}
+			if nb < syscall.STATFIXLEN {
+				return fi, &PathError{"readdir", file.name, 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 fi, &PathError{"readdir", file.name, syscall.ErrShortStat}
+		}
+
+		dir, err := syscall.UnmarshalDir(b[:m])
+		if err != nil {
+			return fi, &PathError{"readdir", file.name, err}
+		}
+		fi = append(fi, fileInfoFromStat(dir))
+
+		d.bufp += m
+		n--
+	}
+
+	if n >= 0 && len(fi) == 0 {
+		return fi, io.EOF
+	}
+	return fi, nil
+}
+
+func (file *File) readdirnames(n int) (names []string, err error) {
+	fi, err := file.Readdir(n)
+	names = make([]string, len(fi))
+	for i := range fi {
+		names[i] = fi[i].Name()
+	}
+	return
+}