1 files changed, 72 insertions, 0 deletions
diff --git a/libgo/go/os/dir.go b/libgo/go/os/dir.go
new file mode 100644
index 000000000..b3b5d3e37
--- /dev/null
+++ b/libgo/go/os/dir.go
@@ -0,0 +1,72 @@
+// 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"
+	"unsafe"
+)
+
+func libc_dup(fd int) int __asm__ ("dup")
+func libc_opendir(*byte) *syscall.DIR __asm__ ("opendir")
+func libc_closedir(*syscall.DIR) int __asm__ ("closedir")
+
+// FIXME: pathconf returns long, not int.
+func libc_pathconf(*byte, int) int __asm__ ("pathconf")
+
+func clen(n []byte) int {
+	for i := 0; i < len(n); i++ {
+		if n[i] == 0 {
+			return i
+		}
+	}
+	return len(n)
+}
+
+var elen int;
+
+// Negative count means read until EOF.
+func (file *File) Readdirnames(count int) (names []string, err Error) {
+	if elen == 0 {
+		var dummy syscall.Dirent;
+		elen = (unsafe.Offsetof(dummy.Name) +
+			libc_pathconf(syscall.StringBytePtr(file.name),	syscall.PC_NAME_MAX) +
+			1);
+	}
+
+	if file.dirinfo == nil {
+		file.dirinfo = new(dirInfo)
+		file.dirinfo.buf = make([]byte, elen)
+		file.dirinfo.dir = libc_opendir(syscall.StringBytePtr(file.name))
+	}
+
+	entry_dirent := unsafe.Pointer(&file.dirinfo.buf[0]).(*syscall.Dirent)
+
+	size := count
+	if size < 0 {
+		size = 100
+	}
+	names = make([]string, 0, size) // Empty with room to grow.
+
+	dir := file.dirinfo.dir
+	if dir == nil {
+		return names, NewSyscallError("opendir", syscall.GetErrno())
+	}	
+
+	for count != 0 {
+		var result *syscall.Dirent
+		i := libc_readdir_r(dir, entry_dirent, &result)
+		if result == nil {
+			break
+		}
+		var name = string(result.Name[0:clen(result.Name[0:])])
+		if name == "." || name == ".." {	// Useless names
+			continue
+		}
+		count--
+		names = append(names, name)
+	}
+	return names, nil
+}