/
path_win.go
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/
path_win.go
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// Copyright 2020 CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Copyright 2010 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 path
import (
"strings"
)
type windowsInfo struct{}
var _ osInfo = windowsInfo{}
const (
windowsSeparator = '\\'
windowsListSeparator = ';'
)
func isSlash(c uint8) bool {
return c == '\\' || c == '/'
}
func (os windowsInfo) IsPathSeparator(b byte) bool {
return isSlash(b)
}
// reservedNames lists reserved Windows names. Search for PRN in
// https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
// for details.
var reservedNames = []string{
"CON", "PRN", "AUX", "NUL",
"COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
"LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
}
// isReservedName returns true, if path is Windows reserved name.
// See reservedNames for the full list.
func (os windowsInfo) isReservedName(path string) bool {
if len(path) == 0 {
return false
}
for _, reserved := range reservedNames {
if strings.EqualFold(path, reserved) {
return true
}
}
return false
}
// IsAbs reports whether the path is absolute.
func (os windowsInfo) IsAbs(path string) (b bool) {
if os.isReservedName(path) {
return true
}
l := os.volumeNameLen(path)
if l == 0 {
return false
}
path = path[l:]
if path == "" {
return false
}
return isSlash(path[0])
}
// volumeNameLen returns length of the leading volume name on Windows.
// It returns 0 elsewhere.
func (os windowsInfo) volumeNameLen(path string) int {
if len(path) < 2 {
return 0
}
// with drive letter
c := path[0]
if path[1] == ':' && ('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z') {
return 2
}
// is it UNC? https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247(v=vs.85).aspx
if l := len(path); l >= 5 && isSlash(path[0]) && isSlash(path[1]) &&
!isSlash(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 isSlash(path[n]) {
n++
// third, following something characters. its share name.
if !isSlash(path[n]) {
if path[n] == '.' {
break
}
for ; n < l; n++ {
if isSlash(path[n]) {
break
}
}
return n
}
break
}
}
}
return 0
}
// HasPrefix exists for historical compatibility and should not be used.
//
// Deprecated: HasPrefix does not respect path boundaries and
// does not ignore case when required.
func (os windowsInfo) HasPrefix(p, prefix string) bool {
if strings.HasPrefix(p, prefix) {
return true
}
return strings.HasPrefix(strings.ToLower(p), strings.ToLower(prefix))
}
func (os windowsInfo) splitList(path string) []string {
// The same implementation is used in LookPath in os/exec;
// consider changing os/exec when changing this.
if path == "" {
return []string{}
}
// Split path, respecting but preserving quotes.
list := []string{}
start := 0
quo := false
for i := 0; i < len(path); i++ {
switch c := path[i]; {
case c == '"':
quo = !quo
case c == windowsListSeparator && !quo:
list = append(list, path[start:i])
start = i + 1
}
}
list = append(list, path[start:])
// Remove quotes.
for i, s := range list {
list[i] = strings.ReplaceAll(s, `"`, ``)
}
return list
}
func (os windowsInfo) join(elem []string) string {
for i, e := range elem {
if e != "" {
return os.joinNonEmpty(elem[i:])
}
}
return ""
}
// joinNonEmpty is like join, but it assumes that the first element is non-empty.
func (o windowsInfo) joinNonEmpty(elem []string) string {
if len(elem[0]) == 2 && elem[0][1] == ':' {
// First element is drive letter without terminating slash.
// Keep path relative to current directory on that drive.
// Skip empty elements.
i := 1
for ; i < len(elem); i++ {
if elem[i] != "" {
break
}
}
return clean(elem[0]+strings.Join(elem[i:], string(windowsSeparator)), windows)
}
// The following logic prevents Join from inadvertently creating a
// UNC path on Windows. Unless the first element is a UNC path, Join
// shouldn't create a UNC path. See golang.org/issue/9167.
p := clean(strings.Join(elem, string(windowsSeparator)), windows)
if !isUNC(p) {
return p
}
// p == UNC only allowed when the first element is a UNC path.
head := clean(elem[0], windows)
if isUNC(head) {
return p
}
// head + tail == UNC, but joining two non-UNC paths should not result
// in a UNC path. Undo creation of UNC path.
tail := clean(strings.Join(elem[1:], string(windowsSeparator)), windows)
if head[len(head)-1] == windowsSeparator {
return head + tail
}
return head + string(windowsSeparator) + tail
}
// isUNC reports whether path is a UNC path.
func isUNC(path string) bool {
return windows.volumeNameLen(path) > 2
}
func (o windowsInfo) sameWord(a, b string) bool {
return strings.EqualFold(a, b)
}