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) {
15	return syscall.Getenv(key)
16}
17
18func Setenv(key, value string) error {
19	return syscall.Setenv(key, value)
20}
21
22func Clearenv() {
23	syscall.Clearenv()
24}
25
26func Environ() []string {
27	return 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) {
34	var block *uint16
35	err = CreateEnvironmentBlock(&block, token, inheritExisting)
36	if err != nil {
37		return nil, err
38	}
39	defer DestroyEnvironmentBlock(block)
40	blockp := uintptr(unsafe.Pointer(block))
41	for {
42		entry := UTF16PtrToString((*uint16)(unsafe.Pointer(blockp)))
43		if len(entry) == 0 {
44			break
45		}
46		env = append(env, entry)
47		blockp += 2 * (uintptr(len(entry)) + 1)
48	}
49	return env, nil
50}
51
52func Unsetenv(key string) error {
53	return syscall.Unsetenv(key)
54}
55