tc_unix.go

//go:build darwin || freebsd || linux || netbsd || openbsd || zos
// +build darwin freebsd linux netbsd openbsd zos

/*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package console

import (
	"golang.org/x/sys/unix"
)

func tcget(fd uintptr, p *unix.Termios) error {
	termios, err := unix.IoctlGetTermios(int(fd), cmdTcGet)
	if err != nil {
		return err
	}
	*p = *termios
	return nil
}

func tcset(fd uintptr, p *unix.Termios) error {
	return unix.IoctlSetTermios(int(fd), cmdTcSet, p)
}

func tcgwinsz(fd uintptr) (WinSize, error) {
	var ws WinSize

	uws, err := unix.IoctlGetWinsize(int(fd), unix.TIOCGWINSZ)
	if err != nil {
		return ws, err
	}

	// Translate from unix.Winsize to console.WinSize
	ws.Height = uws.Row
	ws.Width = uws.Col
	ws.x = uws.Xpixel
	ws.y = uws.Ypixel
	return ws, nil
}

func tcswinsz(fd uintptr, ws WinSize) error {
	// Translate from console.WinSize to unix.Winsize

	var uws unix.Winsize
	uws.Row = ws.Height
	uws.Col = ws.Width
	uws.Xpixel = ws.x
	uws.Ypixel = ws.y

	return unix.IoctlSetWinsize(int(fd), unix.TIOCSWINSZ, &uws)
}

func setONLCR(fd uintptr, enable bool) error {
	var termios unix.Termios
	if err := tcget(fd, &termios); err != nil {
		return err
	}
	if enable {
		// Set +onlcr so we can act like a real terminal
		termios.Oflag |= unix.ONLCR
	} else {
		// Set -onlcr so we don't have to deal with \r.
		termios.Oflag &^= unix.ONLCR
	}
	return tcset(fd, &termios)
}

func cfmakeraw(t unix.Termios) unix.Termios {
	t.Iflag &^= (unix.IGNBRK | unix.BRKINT | unix.PARMRK | unix.ISTRIP | unix.INLCR | unix.IGNCR | unix.ICRNL | unix.IXON)
	t.Oflag &^= unix.OPOST
	t.Lflag &^= (unix.ECHO | unix.ECHONL | unix.ICANON | unix.ISIG | unix.IEXTEN)
	t.Cflag &^= (unix.CSIZE | unix.PARENB)
	t.Cflag |= unix.CS8
	t.Cc[unix.VMIN] = 1
	t.Cc[unix.VTIME] = 0

	return t
}