source: code/trunk/vendor/golang.org/x/term/term_windows.go@ 822

// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package term

import (
        "os"

        "golang.org/x/sys/windows"
)

type state struct {
        mode uint32
}

func isTerminal(fd int) bool {
        var st uint32
        err := windows.GetConsoleMode(windows.Handle(fd), &st)
        return err == nil
}

func makeRaw(fd int) (*State, error) {
        var st uint32
        if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
                return nil, err
        }
        raw := st &^ (windows.ENABLE_ECHO_INPUT | windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
        if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
                return nil, err
        }
        return &State{state{st}}, nil
}

func getState(fd int) (*State, error) {
        var st uint32
        if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
                return nil, err
        }
        return &State{state{st}}, nil
}

func restore(fd int, state *State) error {
        return windows.SetConsoleMode(windows.Handle(fd), state.mode)
}

func getSize(fd int) (width, height int, err error) {
        var info windows.ConsoleScreenBufferInfo
        if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
                return 0, 0, err
        }
        return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
}

func readPassword(fd int) ([]byte, error) {
        var st uint32
        if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
                return nil, err
        }
        old := st

        st &^= (windows.ENABLE_ECHO_INPUT | windows.ENABLE_LINE_INPUT)
        st |= (windows.ENABLE_PROCESSED_OUTPUT | windows.ENABLE_PROCESSED_INPUT)
        if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
                return nil, err
        }

        defer windows.SetConsoleMode(windows.Handle(fd), old)

        var h windows.Handle
        p, _ := windows.GetCurrentProcess()
        if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
                return nil, err
        }

        f := os.NewFile(uintptr(h), "stdin")
        defer f.Close()
        return readPasswordLine(f)
}