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