69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
// Copyright 2012 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 walk
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import (
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"syscall"
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)
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func toShort(path string) (string, error) {
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p, err := syscall.UTF16FromString(path)
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if err != nil {
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return "", err
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}
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b := p // GetShortPathName says we can reuse buffer
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n, err := syscall.GetShortPathName(&p[0], &b[0], uint32(len(b)))
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if err != nil {
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return "", err
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}
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if n > uint32(len(b)) {
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b = make([]uint16, n)
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n, err = syscall.GetShortPathName(&p[0], &b[0], uint32(len(b)))
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if err != nil {
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return "", err
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}
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}
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return syscall.UTF16ToString(b), nil
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}
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func toLong(path string) (string, error) {
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p, err := syscall.UTF16FromString(path)
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if err != nil {
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return "", err
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}
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b := p // GetLongPathName says we can reuse buffer
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n, err := syscall.GetLongPathName(&p[0], &b[0], uint32(len(b)))
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if err != nil {
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return "", err
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}
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if n > uint32(len(b)) {
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b = make([]uint16, n)
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n, err = syscall.GetLongPathName(&p[0], &b[0], uint32(len(b)))
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if err != nil {
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return "", err
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}
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}
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b = b[:n]
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return syscall.UTF16ToString(b), nil
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}
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func evalSymlinks(path string) (string, error) {
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p, err := toShort(path)
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if err != nil {
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return "", err
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}
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p, err = toLong(p)
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if err != nil {
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return "", err
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}
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// syscall.GetLongPathName does not change the case of the drive letter,
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// but the result of EvalSymlinks must be unique, so we have
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// EvalSymlinks(`c:\a`) == EvalSymlinks(`C:\a`).
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// Make drive letter upper case.
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if len(p) >= 2 && p[1] == ':' && 'a' <= p[0] && p[0] <= 'z' {
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p = string(p[0]+'A'-'a') + p[1:]
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}
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return Clean(p), nil
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}
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