forked from toolshed/abra
92 lines
2.3 KiB
Go
92 lines
2.3 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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//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
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package term
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import (
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"golang.org/x/sys/unix"
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)
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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.IoctlGetTermios(fd, ioctlReadTermios)
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return err == nil
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}
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func makeRaw(fd int) (*State, error) {
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termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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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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// This attempts to replicate the behaviour documented for cfmakeraw in
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// the termios(3) manpage.
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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, ioctlWriteTermios, 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 getState(fd int) (*State, error) {
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termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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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 restore(fd int, state *State) error {
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return unix.IoctlSetTermios(fd, ioctlWriteTermios, &state.termios)
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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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// passwordReader is an io.Reader that reads from a specific file descriptor.
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type passwordReader int
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func (r passwordReader) Read(buf []byte) (int, error) {
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return unix.Read(int(r), buf)
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}
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func readPassword(fd int) ([]byte, error) {
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termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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if err != nil {
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return nil, err
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}
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newState := *termios
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newState.Lflag &^= unix.ECHO
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newState.Lflag |= unix.ICANON | unix.ISIG
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newState.Iflag |= unix.ICRNL
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if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &newState); err != nil {
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return nil, err
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}
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defer unix.IoctlSetTermios(fd, ioctlWriteTermios, termios)
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return readPasswordLine(passwordReader(fd))
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}
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