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 {
14	mode uint32
15}
16
17func isTerminal(fd int) bool {
18	var st uint32
19	err := windows.GetConsoleMode(windows.Handle(fd), &st)
20	return err == nil
21}
22
23func makeRaw(fd int) (*State, error) {
24	var st uint32
25	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
26		return nil, err
27	}
28	raw := st &^ (windows.ENABLE_ECHO_INPUT | windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
29	if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
30		return nil, err
31	}
32	return &State{state{st}}, nil
33}
34
35func getState(fd int) (*State, error) {
36	var st uint32
37	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
38		return nil, err
39	}
40	return &State{state{st}}, nil
41}
42
43func restore(fd int, state *State) error {
44	return windows.SetConsoleMode(windows.Handle(fd), state.mode)
45}
46
47func getSize(fd int) (width, height int, err error) {
48	var info windows.ConsoleScreenBufferInfo
49	if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
50		return 0, 0, err
51	}
52	return 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) {
56	var st uint32
57	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
58		return nil, err
59	}
60	old := st
61
62	st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
63	st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
64	if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
65		return nil, err
66	}
67
68	defer windows.SetConsoleMode(windows.Handle(fd), old)
69
70	var h windows.Handle
71	p, _ := windows.GetCurrentProcess()
72	if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
73		return nil, err
74	}
75
76	f := os.NewFile(uintptr(h), "stdin")
77	defer f.Close()
78	return readPasswordLine(f)
79}