mirror of
https://github.com/ergochat/ergo.git
synced 2024-11-23 12:29:25 +01:00
115 lines
3.4 KiB
Go
115 lines
3.4 KiB
Go
// Copyright 2011 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.
|
|
|
|
// +build aix darwin dragonfly freebsd linux,!appengine netbsd openbsd
|
|
|
|
// Package terminal provides support functions for dealing with terminals, as
|
|
// commonly found on UNIX systems.
|
|
//
|
|
// Putting a terminal into raw mode is the most common requirement:
|
|
//
|
|
// oldState, err := terminal.MakeRaw(0)
|
|
// if err != nil {
|
|
// panic(err)
|
|
// }
|
|
// defer terminal.Restore(0, oldState)
|
|
package terminal // import "golang.org/x/crypto/ssh/terminal"
|
|
|
|
import (
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
// State contains the state of a terminal.
|
|
type State struct {
|
|
termios unix.Termios
|
|
}
|
|
|
|
// IsTerminal returns whether the given file descriptor is a terminal.
|
|
func IsTerminal(fd int) bool {
|
|
_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
|
|
return err == nil
|
|
}
|
|
|
|
// MakeRaw put the terminal connected to the given file descriptor into raw
|
|
// mode and returns the previous state of the terminal so that it can be
|
|
// restored.
|
|
func MakeRaw(fd int) (*State, error) {
|
|
termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
oldState := State{termios: *termios}
|
|
|
|
// This attempts to replicate the behaviour documented for cfmakeraw in
|
|
// the termios(3) manpage.
|
|
termios.Iflag &^= unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON
|
|
termios.Oflag &^= unix.OPOST
|
|
termios.Lflag &^= unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN
|
|
termios.Cflag &^= unix.CSIZE | unix.PARENB
|
|
termios.Cflag |= unix.CS8
|
|
termios.Cc[unix.VMIN] = 1
|
|
termios.Cc[unix.VTIME] = 0
|
|
if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, termios); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &oldState, nil
|
|
}
|
|
|
|
// GetState returns the current state of a terminal which may be useful to
|
|
// restore the terminal after a signal.
|
|
func GetState(fd int) (*State, error) {
|
|
termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &State{termios: *termios}, nil
|
|
}
|
|
|
|
// Restore restores the terminal connected to the given file descriptor to a
|
|
// previous state.
|
|
func Restore(fd int, state *State) error {
|
|
return unix.IoctlSetTermios(fd, ioctlWriteTermios, &state.termios)
|
|
}
|
|
|
|
// GetSize returns the dimensions of the given terminal.
|
|
func GetSize(fd int) (width, height int, err error) {
|
|
ws, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
|
|
if err != nil {
|
|
return -1, -1, err
|
|
}
|
|
return int(ws.Col), int(ws.Row), nil
|
|
}
|
|
|
|
// passwordReader is an io.Reader that reads from a specific file descriptor.
|
|
type passwordReader int
|
|
|
|
func (r passwordReader) Read(buf []byte) (int, error) {
|
|
return unix.Read(int(r), buf)
|
|
}
|
|
|
|
// ReadPassword reads a line of input from a terminal without local echo. This
|
|
// is commonly used for inputting passwords and other sensitive data. The slice
|
|
// returned does not include the \n.
|
|
func ReadPassword(fd int) ([]byte, error) {
|
|
termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
newState := *termios
|
|
newState.Lflag &^= unix.ECHO
|
|
newState.Lflag |= unix.ICANON | unix.ISIG
|
|
newState.Iflag |= unix.ICRNL
|
|
if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &newState); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
defer unix.IoctlSetTermios(fd, ioctlWriteTermios, termios)
|
|
|
|
return readPasswordLine(passwordReader(fd))
|
|
}
|