128 lines
3.3 KiB
Go
128 lines
3.3 KiB
Go
// 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 os
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import (
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"syscall"
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"utf16"
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"unsafe"
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)
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// ENOENV is the Error indicating that an environment variable does not exist.
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var ENOENV = NewError("no such environment variable")
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// Getenverror retrieves the value of the environment variable named by the key.
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// It returns the value and an error, if any.
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func Getenverror(key string) (value string, err Error) {
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b := make([]uint16, 100)
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n, e := syscall.GetEnvironmentVariable(syscall.StringToUTF16Ptr(key), &b[0], uint32(len(b)))
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if n == 0 && e == syscall.ERROR_ENVVAR_NOT_FOUND {
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return "", ENOENV
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}
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if n > uint32(len(b)) {
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b = make([]uint16, n)
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n, e = syscall.GetEnvironmentVariable(syscall.StringToUTF16Ptr(key), &b[0], uint32(len(b)))
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if n > uint32(len(b)) {
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n = 0
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}
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}
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if n == 0 {
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return "", NewSyscallError("GetEnvironmentVariable", e)
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}
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return string(utf16.Decode(b[0:n])), nil
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}
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// Getenv retrieves the value of the environment variable named by the key.
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// It returns the value, which will be empty if the variable is not present.
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func Getenv(key string) string {
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v, _ := Getenverror(key)
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return v
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}
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// Setenv sets the value of the environment variable named by the key.
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// It returns an Error, if any.
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func Setenv(key, value string) Error {
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var v *uint16
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if len(value) > 0 {
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v = syscall.StringToUTF16Ptr(value)
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}
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e := syscall.SetEnvironmentVariable(syscall.StringToUTF16Ptr(key), v)
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if e != 0 {
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return NewSyscallError("SetEnvironmentVariable", e)
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}
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return nil
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}
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// Clearenv deletes all environment variables.
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func Clearenv() {
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for _, s := range Environ() {
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// Environment variables can begin with =
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// so start looking for the separator = at j=1.
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// http://blogs.msdn.com/b/oldnewthing/archive/2010/05/06/10008132.aspx
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for j := 1; j < len(s); j++ {
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if s[j] == '=' {
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Setenv(s[0:j], "")
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break
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}
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}
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}
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}
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// Environ returns an array of strings representing the environment,
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// in the form "key=value".
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func Environ() []string {
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s, e := syscall.GetEnvironmentStrings()
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if e != 0 {
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return nil
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}
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defer syscall.FreeEnvironmentStrings(s)
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r := make([]string, 0, 50) // Empty with room to grow.
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for from, i, p := 0, 0, (*[1 << 24]uint16)(unsafe.Pointer(s)); true; i++ {
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if p[i] == 0 {
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// empty string marks the end
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if i <= from {
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break
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}
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r = append(r, string(utf16.Decode(p[from:i])))
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from = i + 1
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}
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}
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return r
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}
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// TempDir returns the default directory to use for temporary files.
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func TempDir() string {
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const pathSep = '\\'
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dirw := make([]uint16, syscall.MAX_PATH)
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n, _ := syscall.GetTempPath(uint32(len(dirw)), &dirw[0])
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if n > uint32(len(dirw)) {
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dirw = make([]uint16, n)
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n, _ = syscall.GetTempPath(uint32(len(dirw)), &dirw[0])
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if n > uint32(len(dirw)) {
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n = 0
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}
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}
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if n > 0 && dirw[n-1] == pathSep {
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n--
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}
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return string(utf16.Decode(dirw[0:n]))
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}
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func init() {
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var argc int32
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cmd := syscall.GetCommandLine()
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argv, e := syscall.CommandLineToArgv(cmd, &argc)
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if e != 0 {
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return
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}
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defer syscall.LocalFree(uint32(uintptr(unsafe.Pointer(argv))))
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Args = make([]string, argc)
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for i, v := range (*argv)[:argc] {
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Args[i] = string(syscall.UTF16ToString((*v)[:]))
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}
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}
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