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112 lines
2.4 KiB
Go
112 lines
2.4 KiB
Go
// Copyright 2019 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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package term
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import (
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"io"
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"syscall"
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"golang.org/x/sys/unix"
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)
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// State contains the state of a terminal.
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type state struct {
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termios unix.Termios
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}
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func isTerminal(fd int) bool {
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_, err := unix.IoctlGetTermio(fd, unix.TCGETA)
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return err == nil
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}
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func readPassword(fd int) ([]byte, error) {
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// see also: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libast/common/uwin/getpass.c
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val, err := unix.IoctlGetTermios(fd, unix.TCGETS)
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if err != nil {
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return nil, err
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}
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oldState := *val
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newState := oldState
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newState.Lflag &^= syscall.ECHO
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newState.Lflag |= syscall.ICANON | syscall.ISIG
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newState.Iflag |= syscall.ICRNL
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err = unix.IoctlSetTermios(fd, unix.TCSETS, &newState)
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if err != nil {
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return nil, err
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}
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defer unix.IoctlSetTermios(fd, unix.TCSETS, &oldState)
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var buf [16]byte
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var ret []byte
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for {
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n, err := syscall.Read(fd, buf[:])
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if err != nil {
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return nil, err
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}
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if n == 0 {
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if len(ret) == 0 {
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return nil, io.EOF
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}
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break
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}
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if buf[n-1] == '\n' {
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n--
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}
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ret = append(ret, buf[:n]...)
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if n < len(buf) {
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break
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}
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}
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return ret, nil
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}
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func makeRaw(fd int) (*State, error) {
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// see http://cr.illumos.org/~webrev/andy_js/1060/
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termios, err := unix.IoctlGetTermios(fd, unix.TCGETS)
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if err != nil {
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return nil, err
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}
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oldState := State{state{termios: *termios}}
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termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON
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termios.Oflag &^= unix.OPOST
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termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN
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termios.Cflag &^= unix.CSIZE | unix.PARENB
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termios.Cflag |= unix.CS8
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termios.Cc[unix.VMIN] = 1
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termios.Cc[unix.VTIME] = 0
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if err := unix.IoctlSetTermios(fd, unix.TCSETS, termios); err != nil {
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return nil, err
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}
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return &oldState, nil
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}
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func restore(fd int, oldState *State) error {
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return unix.IoctlSetTermios(fd, unix.TCSETS, &oldState.termios)
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}
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func getState(fd int) (*State, error) {
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termios, err := unix.IoctlGetTermios(fd, unix.TCGETS)
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if err != nil {
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return nil, err
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}
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return &State{state{termios: *termios}}, nil
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}
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func getSize(fd int) (width, height int, err error) {
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ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
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if err != nil {
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return 0, 0, err
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}
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return int(ws.Col), int(ws.Row), nil
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}
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