1 package rename
2 3 // The following is adapted from goleveldb
4 // (https://github.com/syndtr/goleveldb) under the following license:
5 //
6 // Copyright 2012 Suryandaru Triandana <syndtr@gmail.com> All rights reserved.
7 //
8 // Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
9 // following conditions are met:
10 //
11 // * Redistributions of source code must retain the above copyright notice, this list of conditions and the following
12 // disclaimer.
13 //
14 // * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
15 // disclaimer in the documentation and/or other materials provided with the distribution.
16 //
17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
18 // INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.import (
24 import (
25 "syscall"
26 "unsafe"
27 )
28 29 var (
30 modkernel32 = syscall.NewLazyDLL("kernel32.dll")
31 procMoveFileExW = modkernel32.NewProc("MoveFileExW")
32 )
33 34 const (
35 _MOVEFILE_REPLACE_EXISTING = 1
36 )
37 38 func moveFileEx(from *uint16, to *uint16, flags uint32) (e error) {
39 r1, _, e1 := syscall.Syscall(procMoveFileExW.Addr(), 3,
40 uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(to)),
41 uintptr(flags),
42 )
43 if r1 == 0 {
44 if e1 != 0 {
45 return error(e1)
46 } else {
47 return syscall.EINVAL
48 }
49 }
50 return nil
51 }
52 53 // Atomic provides an atomic file rename. newpath is replaced if it already exists.
54 func Atomic(oldpath, newpath string) (e error) {
55 from, e := syscall.UTF16PtrFromString(oldpath)
56 if e != nil {
57 E.Ln(e)
58 return e
59 }
60 to, e := syscall.UTF16PtrFromString(newpath)
61 if e != nil {
62 E.Ln(e)
63 return e
64 }
65 return moveFileEx(from, to, _MOVEFILE_REPLACE_EXISTING)
66 }
67