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env_windows.go (1367B)

      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 	size := unsafe.Sizeof(*block)
     41 	for *block != 0 {
     42 		// find NUL terminator
     43 		end := unsafe.Pointer(block)
     44 		for *(*uint16)(end) != 0 {
     45 			end = unsafe.Add(end, size)
     46 		}
     47 
     48 		entry := unsafe.Slice(block, (uintptr(end)-uintptr(unsafe.Pointer(block)))/size)
     49 		env = append(env, UTF16ToString(entry))
     50 		block = (*uint16)(unsafe.Add(end, size))
     51 	}
     52 	return env, nil
     53 }
     54 
     55 func Unsetenv(key string) error {
     56 	return syscall.Unsetenv(key)
     57 }