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// Copyright 2019 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.
package os
import (
"internal/syscall/windows"
"syscall"
"unicode/utf16"
"unsafe"
)
func environForSysProcAttr(sys *syscall.SysProcAttr) (env []string, err error) {
if sys == nil || sys.Token == 0 {
return Environ(), nil
}
var block *uint16
err = windows.CreateEnvironmentBlock(&block, sys.Token, false)
if err != nil {
return nil, err
}
defer windows.DestroyEnvironmentBlock(block)
blockp := uintptr(unsafe.Pointer(block))
for {
entry := (*[(1 << 30) - 1]uint16)(unsafe.Pointer(blockp))[:]
for i, v := range entry {
if v == 0 {
entry = entry[:i]
break
}
}
if len(entry) == 0 {
break
}
env = append(env, string(utf16.Decode(entry)))
blockp += 2 * (uintptr(len(entry)) + 1)
}
return
}
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