Imported Upstream version 1.4upstream/1.4

1 files changed, 170 insertions, 0 deletions

diff --git a/src/os/stat_windows.go b/src/os/stat_windows.go
new file mode 100644
index 000000000..f396c1db3
--- /dev/null
+++ b/src/os/stat_windows.go
@@ -0,0 +1,170 @@
+// 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"
+	"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 {
+		return nil, ErrInvalid
+	}
+	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)
+	}
+	if file.name == DevNull {
+		return &devNullStat, nil
+	}
+	var d syscall.ByHandleFileInformation
+	e := syscall.GetFileInformationByHandle(syscall.Handle(file.fd), &d)
+	if e != nil {
+		return nil, &PathError{"GetFileInformationByHandle", file.name, e}
+	}
+	return &fileStat{
+		name: basename(file.name),
+		sys: syscall.Win32FileAttributeData{
+			FileAttributes: d.FileAttributes,
+			CreationTime:   d.CreationTime,
+			LastAccessTime: d.LastAccessTime,
+			LastWriteTime:  d.LastWriteTime,
+			FileSizeHigh:   d.FileSizeHigh,
+			FileSizeLow:    d.FileSizeLow,
+		},
+		vol:   d.VolumeSerialNumber,
+		idxhi: d.FileIndexHigh,
+		idxlo: d.FileIndexLow,
+	}, 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) {
+	for {
+		fi, err = Lstat(name)
+		if err != nil {
+			return
+		}
+		if fi.Mode()&ModeSymlink == 0 {
+			return
+		}
+		name, err = Readlink(name)
+		if err != nil {
+			return
+		}
+	}
+	return fi, err
+}
+
+// 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) {
+	if len(name) == 0 {
+		return nil, &PathError{"Lstat", name, syscall.Errno(syscall.ERROR_PATH_NOT_FOUND)}
+	}
+	if name == DevNull {
+		return &devNullStat, nil
+	}
+	fs := &fileStat{name: basename(name)}
+	namep, e := syscall.UTF16PtrFromString(name)
+	if e != nil {
+		return nil, &PathError{"Lstat", name, e}
+	}
+	e = syscall.GetFileAttributesEx(namep, syscall.GetFileExInfoStandard, (*byte)(unsafe.Pointer(&fs.sys)))
+	if e != nil {
+		return nil, &PathError{"GetFileAttributesEx", name, e}
+	}
+	fs.path = name
+	if !isAbs(fs.path) {
+		fs.path, e = syscall.FullPath(fs.path)
+		if e != nil {
+			return nil, e
+		}
+	}
+	return fs, nil
+}
+
+// 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 isAbs(path string) (b bool) {
+	v := volumeName(path)
+	if v == "" {
+		return false
+	}
+	path = path[len(v):]
+	if path == "" {
+		return false
+	}
+	return IsPathSeparator(path[0])
+}
+
+func volumeName(path string) (v string) {
+	if len(path) < 2 {
+		return ""
+	}
+	// with drive letter
+	c := path[0]
+	if path[1] == ':' &&
+		('0' <= c && c <= '9' || 'a' <= c && c <= 'z' ||
+			'A' <= c && c <= 'Z') {
+		return path[:2]
+	}
+	// is it UNC
+	if l := len(path); l >= 5 && IsPathSeparator(path[0]) && IsPathSeparator(path[1]) &&
+		!IsPathSeparator(path[2]) && path[2] != '.' {
+		// first, leading `\\` and next shouldn't be `\`. its server name.
+		for n := 3; n < l-1; n++ {
+			// second, next '\' shouldn't be repeated.
+			if IsPathSeparator(path[n]) {
+				n++
+				// third, following something characters. its share name.
+				if !IsPathSeparator(path[n]) {
+					if path[n] == '.' {
+						break
+					}
+					for ; n < l; n++ {
+						if IsPathSeparator(path[n]) {
+							break
+						}
+					}
+					return path[:n]
+				}
+				break
+			}
+		}
+	}
+	return ""
+}