mirror of
https://github.com/golang/go
synced 2024-11-18 12:54:44 -07:00
c007ce824d
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
171 lines
4.0 KiB
Go
171 lines
4.0 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import (
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"syscall"
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"unsafe"
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)
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// Stat returns the FileInfo structure describing file.
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// If there is an error, it will be of type *PathError.
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func (file *File) Stat() (fi FileInfo, err error) {
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if file == nil {
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return nil, ErrInvalid
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}
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if file == nil || file.fd < 0 {
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return nil, syscall.EINVAL
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}
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if file.isdir() {
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// I don't know any better way to do that for directory
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return Stat(file.name)
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}
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if file.name == DevNull {
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return &devNullStat, nil
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}
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var d syscall.ByHandleFileInformation
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e := syscall.GetFileInformationByHandle(syscall.Handle(file.fd), &d)
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if e != nil {
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return nil, &PathError{"GetFileInformationByHandle", file.name, e}
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}
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return &fileStat{
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name: basename(file.name),
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sys: syscall.Win32FileAttributeData{
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FileAttributes: d.FileAttributes,
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CreationTime: d.CreationTime,
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LastAccessTime: d.LastAccessTime,
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LastWriteTime: d.LastWriteTime,
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FileSizeHigh: d.FileSizeHigh,
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FileSizeLow: d.FileSizeLow,
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},
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vol: d.VolumeSerialNumber,
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idxhi: d.FileIndexHigh,
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idxlo: d.FileIndexLow,
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}, nil
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}
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// Stat returns a FileInfo structure describing the named file.
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// If there is an error, it will be of type *PathError.
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func Stat(name string) (fi FileInfo, err error) {
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for {
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fi, err = Lstat(name)
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if err != nil {
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return
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}
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if fi.Mode()&ModeSymlink == 0 {
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return
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}
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name, err = Readlink(name)
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if err != nil {
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return
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}
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}
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return fi, err
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}
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// Lstat returns the FileInfo structure describing the named file.
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// If the file is a symbolic link, the returned FileInfo
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// describes the symbolic link. Lstat makes no attempt to follow the link.
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// If there is an error, it will be of type *PathError.
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func Lstat(name string) (fi FileInfo, err error) {
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if len(name) == 0 {
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return nil, &PathError{"Lstat", name, syscall.Errno(syscall.ERROR_PATH_NOT_FOUND)}
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}
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if name == DevNull {
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return &devNullStat, nil
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}
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fs := &fileStat{name: basename(name)}
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namep, e := syscall.UTF16PtrFromString(name)
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if e != nil {
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return nil, &PathError{"Lstat", name, e}
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}
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e = syscall.GetFileAttributesEx(namep, syscall.GetFileExInfoStandard, (*byte)(unsafe.Pointer(&fs.sys)))
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if e != nil {
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return nil, &PathError{"GetFileAttributesEx", name, e}
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}
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fs.path = name
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if !isAbs(fs.path) {
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fs.path, e = syscall.FullPath(fs.path)
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if e != nil {
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return nil, e
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}
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}
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return fs, nil
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}
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// basename removes trailing slashes and the leading
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// directory name and drive letter from path name.
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func basename(name string) string {
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// Remove drive letter
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if len(name) == 2 && name[1] == ':' {
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name = "."
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} else if len(name) > 2 && name[1] == ':' {
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name = name[2:]
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}
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i := len(name) - 1
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// Remove trailing slashes
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for ; i > 0 && (name[i] == '/' || name[i] == '\\'); i-- {
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name = name[:i]
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}
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// Remove leading directory name
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for i--; i >= 0; i-- {
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if name[i] == '/' || name[i] == '\\' {
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name = name[i+1:]
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break
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}
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}
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return name
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}
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func isAbs(path string) (b bool) {
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v := volumeName(path)
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if v == "" {
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return false
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}
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path = path[len(v):]
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if path == "" {
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return false
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}
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return IsPathSeparator(path[0])
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}
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func volumeName(path string) (v string) {
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if len(path) < 2 {
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return ""
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}
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// with drive letter
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c := path[0]
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if path[1] == ':' &&
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('0' <= c && c <= '9' || 'a' <= c && c <= 'z' ||
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'A' <= c && c <= 'Z') {
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return path[:2]
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}
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// is it UNC
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if l := len(path); l >= 5 && IsPathSeparator(path[0]) && IsPathSeparator(path[1]) &&
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!IsPathSeparator(path[2]) && path[2] != '.' {
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// first, leading `\\` and next shouldn't be `\`. its server name.
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for n := 3; n < l-1; n++ {
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// second, next '\' shouldn't be repeated.
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if IsPathSeparator(path[n]) {
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n++
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// third, following something characters. its share name.
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if !IsPathSeparator(path[n]) {
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if path[n] == '.' {
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break
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}
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for ; n < l; n++ {
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if IsPathSeparator(path[n]) {
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break
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}
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}
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return path[:n]
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}
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break
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}
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}
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}
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return ""
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}
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