Imported Upstream version 2011.04.13upstream/2011.04.13

1 files changed, 54 insertions, 0 deletions

diff --git a/src/pkg/os/dir_unix.go b/src/pkg/os/dir_unix.go
new file mode 100644
index 000000000..f5b82230d
--- /dev/null
+++ b/src/pkg/os/dir_unix.go
@@ -0,0 +1,54 @@
+// 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 (
+	"syscall"
+)
+
+const (
+	blockSize = 4096
+)
+
+// Readdirnames reads the contents of the directory associated with file and
+// returns an array of up to count names, in directory order.  Subsequent
+// calls on the same file will yield further names.
+// A negative count means to read until EOF.
+// Readdirnames returns the array and an Error, if any.
+func (file *File) Readdirnames(count int) (names []string, err Error) {
+	// If this file has no dirinfo, create one.
+	if file.dirinfo == nil {
+		file.dirinfo = new(dirInfo)
+		// The buffer must be at least a block long.
+		file.dirinfo.buf = make([]byte, blockSize)
+	}
+	d := file.dirinfo
+	size := count
+	if size < 0 {
+		size = 100
+	}
+	names = make([]string, 0, size) // Empty with room to grow.
+	for count != 0 {
+		// Refill the buffer if necessary
+		if d.bufp >= d.nbuf {
+			d.bufp = 0
+			var errno int
+			d.nbuf, errno = syscall.ReadDirent(file.fd, d.buf)
+			if errno != 0 {
+				return names, NewSyscallError("readdirent", errno)
+			}
+			if d.nbuf <= 0 {
+				break // EOF
+			}
+		}
+
+		// Drain the buffer
+		var nb, nc int
+		nb, nc, names = syscall.ParseDirent(d.buf[d.bufp:d.nbuf], count, names)
+		d.bufp += nb
+		count -= nc
+	}
+	return names, nil
+}