72 lines
2.3 KiB
Go
72 lines
2.3 KiB
Go
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// The following is adapted from goleveldb
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// (https://github.com/syndtr/goleveldb) under the following license:
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//
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// Copyright 2012 Suryandaru Triandana <syndtr@gmail.com>
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package main
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import (
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"syscall"
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"unsafe"
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)
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var (
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modkernel32 = syscall.NewLazyDLL("kernel32.dll")
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procMoveFileExW = modkernel32.NewProc("MoveFileExW")
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)
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const (
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_MOVEFILE_REPLACE_EXISTING = 1
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)
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func moveFileEx(from *uint16, to *uint16, flags uint32) error {
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r1, _, e1 := syscall.Syscall(procMoveFileExW.Addr(), 3,
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uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(to)),
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uintptr(flags))
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if r1 == 0 {
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if e1 != 0 {
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return error(e1)
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} else {
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return syscall.EINVAL
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}
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}
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return nil
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}
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// Rename provides an atomic file rename. newpath is replaced if it
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// already exists.
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func Rename(oldpath, newpath string) error {
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from, err := syscall.UTF16PtrFromString(oldpath)
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if err != nil {
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return err
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}
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to, err := syscall.UTF16PtrFromString(newpath)
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if err != nil {
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return err
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}
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return moveFileEx(from, to, _MOVEFILE_REPLACE_EXISTING)
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}
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