mirror of
https://github.com/autc04/Retro68.git
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55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// Copyright 2020 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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//go:build windows
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package execenv
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import (
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"internal/syscall/windows"
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"syscall"
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"unicode/utf16"
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"unsafe"
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)
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// Default will return the default environment
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// variables based on the process attributes
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// provided.
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//
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// If the process attributes contain a token, then
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// the environment variables will be sourced from
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// the defaults for that user token, otherwise they
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// will be sourced from syscall.Environ().
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func Default(sys *syscall.SysProcAttr) (env []string, err error) {
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if sys == nil || sys.Token == 0 {
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return syscall.Environ(), nil
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}
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var block *uint16
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err = windows.CreateEnvironmentBlock(&block, sys.Token, false)
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if err != nil {
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return nil, err
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}
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defer windows.DestroyEnvironmentBlock(block)
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blockp := uintptr(unsafe.Pointer(block))
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for {
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// find NUL terminator
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end := unsafe.Pointer(blockp)
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for *(*uint16)(end) != 0 {
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end = unsafe.Pointer(uintptr(end) + 2)
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}
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n := (uintptr(end) - uintptr(unsafe.Pointer(blockp))) / 2
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if n == 0 {
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// environment block ends with empty string
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break
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}
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entry := (*[(1 << 30) - 1]uint16)(unsafe.Pointer(blockp))[:n:n]
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env = append(env, string(utf16.Decode(entry)))
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blockp += 2 * (uintptr(len(entry)) + 1)
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}
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return
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}
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