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.
5 // Windows environment variables.
14 func Getenv(key string) (value string, found bool) {
15 keyp, err := UTF16PtrFromString(key)
19 b := make([]uint16, 100)
20 n, e := GetEnvironmentVariable(keyp, &b[0], uint32(len(b)))
21 if n == 0 && e == ERROR_ENVVAR_NOT_FOUND {
24 if n > uint32(len(b)) {
26 n, e = GetEnvironmentVariable(keyp, &b[0], uint32(len(b)))
27 if n > uint32(len(b)) {
34 return string(utf16.Decode(b[0:n])), true
37 func Setenv(key, value string) error {
41 v, err = UTF16PtrFromString(value)
46 keyp, err := UTF16PtrFromString(key)
50 e := SetEnvironmentVariable(keyp, v)
58 for _, s := range Environ() {
59 // Environment variables can begin with =
60 // so start looking for the separator = at j=1.
61 // http://blogs.msdn.com/b/oldnewthing/archive/2010/05/06/10008132.aspx
62 for j := 1; j < len(s); j++ {
71 func Environ() []string {
72 s, e := GetEnvironmentStrings()
76 defer FreeEnvironmentStrings(s)
77 r := make([]string, 0, 50) // Empty with room to grow.
78 for from, i, p := 0, 0, (*[1 << 24]uint16)(unsafe.Pointer(s)); true; i++ {
80 // empty string marks the end
84 r = append(r, string(utf16.Decode(p[from:i])))