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	raw |= windows.ENABLE_VIRTUAL_TERMINAL_INPUT
30	if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
31		return nil, err
32	}
33	return &State{state{st}}, nil
34}
35
36func getState(fd int) (*State, error) {
37	var st uint32
38	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
39		return nil, err
40	}
41	return &State{state{st}}, nil
42}
43
44func restore(fd int, state *State) error {
45	return windows.SetConsoleMode(windows.Handle(fd), state.mode)
46}
47
48func getSize(fd int) (width, height int, err error) {
49	var info windows.ConsoleScreenBufferInfo
50	if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
51		return 0, 0, err
52	}
53	return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
54}
55
56func readPassword(fd int) ([]byte, error) {
57	var st uint32
58	if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
59		return nil, err
60	}
61	old := st
62
63	st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
64	st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
65	if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
66		return nil, err
67	}
68
69	defer windows.SetConsoleMode(windows.Handle(fd), old)
70
71	var h windows.Handle
72	p, _ := windows.GetCurrentProcess()
73	if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
74		return nil, err
75	}
76
77	f := os.NewFile(uintptr(h), "stdin")
78	defer f.Close()
79	return readPasswordLine(f)
80}