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// 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"
"time"
"unsafe"
)
// Stat returns the FileInfo structure describing file.
// If there is an error, it will be of type *PathError.
func (file *File) Stat() (fi FileInfo, err error) {
if file == nil || file.fd < 0 {
return nil, syscall.EINVAL
}
if file.isdir() {
// I don't know any better way to do that for directory
return Stat(file.name)
}
var d syscall.ByHandleFileInformation
e := syscall.GetFileInformationByHandle(syscall.Handle(file.fd), &d)
if e != nil {
return nil, &PathError{"GetFileInformationByHandle", file.name, e}
}
return toFileInfo(basename(file.name), d.FileAttributes, d.FileSizeHigh, d.FileSizeLow, d.CreationTime, d.LastAccessTime, d.LastWriteTime), nil
}
// Stat returns a FileInfo structure describing the named file.
// If there is an error, it will be of type *PathError.
func Stat(name string) (fi FileInfo, err error) {
if len(name) == 0 {
return nil, &PathError{"Stat", name, syscall.Errno(syscall.ERROR_PATH_NOT_FOUND)}
}
var d syscall.Win32FileAttributeData
e := syscall.GetFileAttributesEx(syscall.StringToUTF16Ptr(name), syscall.GetFileExInfoStandard, (*byte)(unsafe.Pointer(&d)))
if e != nil {
return nil, &PathError{"GetFileAttributesEx", name, e}
}
return toFileInfo(basename(name), d.FileAttributes, d.FileSizeHigh, d.FileSizeLow, d.CreationTime, d.LastAccessTime, d.LastWriteTime), nil
}
// Lstat returns the FileInfo structure describing the named file.
// If the file is a symbolic link, the returned FileInfo
// describes the symbolic link. Lstat makes no attempt to follow the link.
// If there is an error, it will be of type *PathError.
func Lstat(name string) (fi FileInfo, err error) {
// No links on Windows
return Stat(name)
}
// basename removes trailing slashes and the leading
// directory name and drive letter from path name.
func basename(name string) string {
// Remove drive letter
if len(name) == 2 && name[1] == ':' {
name = "."
} else if len(name) > 2 && name[1] == ':' {
name = name[2:]
}
i := len(name) - 1
// Remove trailing slashes
for ; i > 0 && (name[i] == '/' || name[i] == '\\'); i-- {
name = name[:i]
}
// Remove leading directory name
for i--; i >= 0; i-- {
if name[i] == '/' || name[i] == '\\' {
name = name[i+1:]
break
}
}
return name
}
type winTimes struct {
atime, ctime syscall.Filetime
}
func toFileInfo(name string, fa, sizehi, sizelo uint32, ctime, atime, mtime syscall.Filetime) FileInfo {
fs := &fileStat{
name: name,
size: int64(sizehi)<<32 + int64(sizelo),
modTime: time.Unix(0, mtime.Nanoseconds()),
sys: &winTimes{atime, ctime},
}
if fa&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
fs.mode |= ModeDir
}
if fa&syscall.FILE_ATTRIBUTE_READONLY != 0 {
fs.mode |= 0444
} else {
fs.mode |= 0666
}
return fs
}
func sameFile(sys1, sys2 interface{}) bool {
// TODO(rsc): Do better than this, but this matches what
// used to happen when code compared .Dev and .Ino,
// which were both always zero. Obviously not all files
// are the same.
return true
}
// For testing.
func atime(fi FileInfo) time.Time {
return time.Unix(0, fi.Sys().(*winTimes).atime.Nanoseconds())
}
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