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 

     7 package windows

     8 

     9 import (

    10 	"syscall"

    11 	"unsafe"

    12 )

    13 

    14 func Getenv(key string) (value string, found bool) {

    15 	return syscall.Getenv(key)

    16 }

    17 

    18 func Setenv(key, value string) error {

    19 	return syscall.Setenv(key, value)

    20 }

    21 

    22 func Clearenv() {

    23 	syscall.Clearenv()

    24 }

    25 

    26 func 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.

    33 func (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 

    52 func Unsetenv(key string) error {

    53 	return syscall.Unsetenv(key)

    54 }