1 files changed, 110 insertions, 0 deletions
diff --git a/src/os/stat_plan9.go b/src/os/stat_plan9.go
new file mode 100644
index 0000000..e20accf
--- /dev/null
+++ b/src/os/stat_plan9.go
@@ -0,0 +1,110 @@
+// Copyright 2011 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"
+	"time"
+)
+
+const bitSize16 = 2
+
+func fileInfoFromStat(d *syscall.Dir) *fileStat {
+	fs := &fileStat{
+		name:    d.Name,
+		size:    d.Length,
+		modTime: time.Unix(int64(d.Mtime), 0),
+		sys:     d,
+	}
+	fs.mode = FileMode(d.Mode & 0777)
+	if d.Mode&syscall.DMDIR != 0 {
+		fs.mode |= ModeDir
+	}
+	if d.Mode&syscall.DMAPPEND != 0 {
+		fs.mode |= ModeAppend
+	}
+	if d.Mode&syscall.DMEXCL != 0 {
+		fs.mode |= ModeExclusive
+	}
+	if d.Mode&syscall.DMTMP != 0 {
+		fs.mode |= ModeTemporary
+	}
+	// Consider all files not served by #M as device files.
+	if d.Type != 'M' {
+		fs.mode |= ModeDevice
+	}
+	// Consider all files served by #c as character device files.
+	if d.Type == 'c' {
+		fs.mode |= ModeCharDevice
+	}
+	return fs
+}
+
+// arg is an open *File or a path string.
+func dirstat(arg any) (*syscall.Dir, error) {
+	var name string
+	var err error
+
+	size := syscall.STATFIXLEN + 16*4
+
+	for i := 0; i < 2; i++ {
+		buf := make([]byte, bitSize16+size)
+
+		var n int
+		switch a := arg.(type) {
+		case *File:
+			name = a.name
+			n, err = syscall.Fstat(a.fd, buf)
+		case string:
+			name = a
+			n, err = syscall.Stat(a, buf)
+		default:
+			panic("phase error in dirstat")
+		}
+
+		if n < bitSize16 {
+			return nil, &PathError{Op: "stat", Path: name, Err: err}
+		}
+
+		// Pull the real size out of the stat message.
+		size = int(uint16(buf[0]) | uint16(buf[1])<<8)
+
+		// If the stat message is larger than our buffer we will
+		// go around the loop and allocate one that is big enough.
+		if size <= n {
+			d, err := syscall.UnmarshalDir(buf[:n])
+			if err != nil {
+				return nil, &PathError{Op: "stat", Path: name, Err: err}
+			}
+			return d, nil
+		}
+
+	}
+
+	if err == nil {
+		err = syscall.ErrBadStat
+	}
+
+	return nil, &PathError{Op: "stat", Path: name, Err: err}
+}
+
+// statNolog implements Stat for Plan 9.
+func statNolog(name string) (FileInfo, error) {
+	d, err := dirstat(name)
+	if err != nil {
+		return nil, err
+	}
+	return fileInfoFromStat(d), nil
+}
+
+// lstatNolog implements Lstat for Plan 9.
+func lstatNolog(name string) (FileInfo, error) {
+	return statNolog(name)
+}
+
+// For testing.
+func atime(fi FileInfo) time.Time {
+	return time.Unix(int64(fi.Sys().(*syscall.Dir).Atime), 0)
+}