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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 (
"unsafe"
"syscall"
)
// Stat returns the FileInfo structure describing file.
// It returns the FileInfo and an error, if any.
func (file *File) Stat() (fi *FileInfo, err Error) {
if file == nil || file.fd < 0 {
return nil, 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 != 0 {
return nil, &PathError{"GetFileInformationByHandle", file.name, Errno(e)}
}
return setFileInfo(new(FileInfo), 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 and an error, if any.
// If name names a valid symbolic link, the returned FileInfo describes
// the file pointed at by the link and has fi.FollowedSymlink set to true.
// If name names an invalid symbolic link, the returned FileInfo describes
// the link itself and has fi.FollowedSymlink set to false.
func Stat(name string) (fi *FileInfo, err Error) {
if len(name) == 0 {
return nil, &PathError{"Stat", name, Errno(syscall.ERROR_PATH_NOT_FOUND)}
}
var d syscall.Win32FileAttributeData
e := syscall.GetFileAttributesEx(syscall.StringToUTF16Ptr(name), syscall.GetFileExInfoStandard, (*byte)(unsafe.Pointer(&d)))
if e != 0 {
return nil, &PathError{"GetFileAttributesEx", name, Errno(e)}
}
return setFileInfo(new(FileInfo), basename(name), d.FileAttributes, d.FileSizeHigh, d.FileSizeLow, d.CreationTime, d.LastAccessTime, d.LastWriteTime), nil
}
// Lstat returns the FileInfo structure describing the named file and an
// error, if any. If the file is a symbolic link, the returned FileInfo
// describes the symbolic link. Lstat makes no attempt to follow the link.
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
}
func setFileInfo(fi *FileInfo, name string, fa, sizehi, sizelo uint32, ctime, atime, wtime syscall.Filetime) *FileInfo {
fi.Mode = 0
if fa&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
fi.Mode = fi.Mode | syscall.S_IFDIR
} else {
fi.Mode = fi.Mode | syscall.S_IFREG
}
if fa&syscall.FILE_ATTRIBUTE_READONLY != 0 {
fi.Mode = fi.Mode | 0444
} else {
fi.Mode = fi.Mode | 0666
}
fi.Size = int64(sizehi)<<32 + int64(sizelo)
fi.Name = name
fi.FollowedSymlink = false
fi.Atime_ns = atime.Nanoseconds()
fi.Mtime_ns = wtime.Nanoseconds()
fi.Ctime_ns = ctime.Nanoseconds()
return fi
}
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