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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Windows environment variables.
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package windows
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import (
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	"syscall"
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	"unsafe"
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)
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func Getenv(key string) (value string, found bool) {
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	return syscall.Getenv(key)
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}
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func Setenv(key, value string) error {
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	return syscall.Setenv(key, value)
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}
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func Clearenv() {
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	syscall.Clearenv()
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}
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func Environ() []string {
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	return syscall.Environ()
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}
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// Returns a default environment associated with the token, rather than the current
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// process. If inheritExisting is true, then this environment also inherits the
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// environment of the current process.
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func (token Token) Environ(inheritExisting bool) (env []string, err error) {
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	var block *uint16
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	err = CreateEnvironmentBlock(&block, token, inheritExisting)
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	if err != nil {
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		return nil, err
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	}
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	defer DestroyEnvironmentBlock(block)
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	size := unsafe.Sizeof(*block)
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	for *block != 0 {
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		// find NUL terminator
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		end := unsafe.Pointer(block)
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		for *(*uint16)(end) != 0 {
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			end = unsafe.Add(end, size)
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		}
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		entry := unsafe.Slice(block, (uintptr(end)-uintptr(unsafe.Pointer(block)))/size)
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		env = append(env, UTF16ToString(entry))
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		block = (*uint16)(unsafe.Add(end, size))
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	}
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	return env, nil
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}
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func Unsetenv(key string) error {
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	return syscall.Unsetenv(key)
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}
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