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1// Copyright 2010 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// Windows environment variables.
6
7package windows
8
9import (
10"syscall"
11"unsafe"
12)
13
14func Getenv(key string) (value string, found bool) {
15return syscall.Getenv(key)
16}
17
18func Setenv(key, value string) error {
19return syscall.Setenv(key, value)
20}
21
22func Clearenv() {
23syscall.Clearenv()
24}
25
26func Environ() []string {
27return syscall.Environ()
28}
29
30// Returns a default environment associated with the token, rather than the current
31// process. If inheritExisting is true, then this environment also inherits the
32// environment of the current process.
33func (token Token) Environ(inheritExisting bool) (env []string, err error) {
34var block *uint16
35err = CreateEnvironmentBlock(&block, token, inheritExisting)
36if err != nil {
37return nil, err
38}
39defer DestroyEnvironmentBlock(block)
40size := unsafe.Sizeof(*block)
41for *block != 0 {
42// find NUL terminator
43end := unsafe.Pointer(block)
44for *(*uint16)(end) != 0 {
45end = unsafe.Add(end, size)
46}
47
48entry := unsafe.Slice(block, (uintptr(end)-uintptr(unsafe.Pointer(block)))/size)
49env = append(env, UTF16ToString(entry))
50block = (*uint16)(unsafe.Add(end, size))
51}
52return env, nil
53}
54
55func Unsetenv(key string) error {
56return syscall.Unsetenv(key)
57}
58