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// 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"

)

func sameFile(sys1, sys2 interface{}) bool {

        a := sys1.(*Dir)

        b := sys2.(*Dir)

        return a.Qid.Path == b.Qid.Path && a.Type == b.Type && a.Dev == b.Dev

}

func fileInfoFromStat(d *Dir) FileInfo {

        fs := &fileStat{

                name:    d.Name,

                size:    int64(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

        }

        return fs

}

// arg is an open *File or a path string.

func dirstat(arg interface{}) (d *Dir, err error) {

        var name string

        // This is big enough for most stat messages

        // and rounded to a multiple of 128 bytes.

        size := (syscall.STATFIXLEN + 16*4 + 128) &^ 128

        for i := 0; i < 2; i++ {

                buf := make([]byte, 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(name, buf)

                }

                if err != nil {

                        return nil, &PathError{"stat", name, err}

                }

                if n < syscall.STATFIXLEN {

                        return nil, &PathError{"stat", name, Eshortstat}

                }

                // Pull the real size out of the stat message.

                s, _ := gbit16(buf)

                size = int(s)

                // 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 = UnmarshalDir(buf[:n])

                        if err != nil {

                                return nil, &PathError{"stat", name, err}

                        }

                        return

                }

        }

        return nil, &PathError{"stat", name, Ebadstat}

}

// Stat returns a FileInfo structure describing the named file and an error, if any.

func Stat(name string) (FileInfo, error) {

        d, err := dirstat(name)

        if err != nil {

                return nil, err

        }

        return fileInfoFromStat(d), nil

}

// Lstat returns the FileInfo structure describing the named file and an

// error, if any.  If the file is a symbolic link (though Plan 9 does not have symbolic links),

// the returned FileInfo describes the symbolic link.  Lstat makes no attempt to follow the link.

func Lstat(name string) (FileInfo, error) {

        return Stat(name)

}

// For testing.

func atime(fi FileInfo) time.Time {

        return time.Unix(int64(fi.Sys().(*Dir).Atime), 0)

}