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1// Copyright 2019 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package term
6
7import (
8"os"
9
10"golang.org/x/sys/windows"
11)
12
13type state struct {
14mode uint32
15}
16
17func isTerminal(fd int) bool {
18var st uint32
19err := windows.GetConsoleMode(windows.Handle(fd), &st)
20return err == nil
21}
22
23func makeRaw(fd int) (*State, error) {
24var st uint32
25if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
26return nil, err
27}
28raw := st &^ (windows.ENABLE_ECHO_INPUT | windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
29if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
30return nil, err
31}
32return &State{state{st}}, nil
33}
34
35func getState(fd int) (*State, error) {
36var st uint32
37if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
38return nil, err
39}
40return &State{state{st}}, nil
41}
42
43func restore(fd int, state *State) error {
44return windows.SetConsoleMode(windows.Handle(fd), state.mode)
45}
46
47func getSize(fd int) (width, height int, err error) {
48var info windows.ConsoleScreenBufferInfo
49if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
50return 0, 0, err
51}
52return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
53}
54
55func readPassword(fd int) ([]byte, error) {
56var st uint32
57if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
58return nil, err
59}
60old := st
61
62st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
63st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
64if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
65return nil, err
66}
67
68defer windows.SetConsoleMode(windows.Handle(fd), old)
69
70var h windows.Handle
71p, _ := windows.GetCurrentProcess()
72if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
73return nil, err
74}
75
76f := os.NewFile(uintptr(h), "stdin")
77defer f.Close()
78return readPasswordLine(f)
79}
80