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// Copyright 2010 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Windows environment variables.

package windows

import (

	"syscall"

	"unsafe"

)

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

	return syscall.Getenv(key)

}

func Setenv(key, value string) error {

	return syscall.Setenv(key, value)

}

func Clearenv() {

	syscall.Clearenv()

}

func Environ() []string {

	return syscall.Environ()

}

// Returns a default environment associated with the token, rather than the current

// process. If inheritExisting is true, then this environment also inherits the

// environment of the current process.

func (token Token) Environ(inheritExisting bool) (env []string, err error) {

	var block *uint16

	err = CreateEnvironmentBlock(&block, token, inheritExisting)

	if err != nil {

		return nil, err

	}

	defer DestroyEnvironmentBlock(block)

	size := unsafe.Sizeof(*block)

	for *block != 0 {

		// find NUL terminator

		end := unsafe.Pointer(block)

		for *(*uint16)(end) != 0 {

			end = unsafe.Add(end, size)

		}

		entry := unsafe.Slice(block, (uintptr(end)-uintptr(unsafe.Pointer(block)))/size)

		env = append(env, UTF16ToString(entry))

		block = (*uint16)(unsafe.Add(end, size))

	}

	return env, nil

}

func Unsetenv(key string) error {

	return syscall.Unsetenv(key)

}