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114 lines
2.7 KiB
114 lines
2.7 KiB
package main
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import (
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"fmt"
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"os"
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"os/signal"
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"syscall"
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"unsafe"
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)
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type winsize struct {
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Height uint16
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Width uint16
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x uint16
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y uint16
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}
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type State struct {
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termios Termios
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}
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const (
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getTermios = syscall.TCGETS
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setTermios = syscall.TCSETS
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)
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type Termios struct {
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Iflag uint32
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Oflag uint32
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Cflag uint32
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Lflag uint32
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Cc [20]byte
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Ispeed uint32
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Ospeed uint32
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}
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// MakeRaw put the terminal connected to the given file descriptor into raw
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// mode and returns the previous state of the terminal so that it can be
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// restored.
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func MakeRaw(fd uintptr) (*State, error) {
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var oldState State
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if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, getTermios, uintptr(unsafe.Pointer(&oldState.termios))); err != 0 {
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return nil, err
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}
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newState := oldState.termios
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newState.Iflag &^= (syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK | syscall.ISTRIP | syscall.INLCR | syscall.IGNCR | syscall.ICRNL | syscall.IXON)
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newState.Oflag &^= syscall.OPOST
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newState.Lflag &^= (syscall.ECHO | syscall.ECHONL | syscall.ICANON | syscall.ISIG | syscall.IEXTEN)
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newState.Cflag &^= (syscall.CSIZE | syscall.PARENB)
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newState.Cflag |= syscall.CS8
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if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, setTermios, uintptr(unsafe.Pointer(&newState))); err != 0 {
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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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// Restore restores the terminal connected to the given file descriptor to a
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// previous state.
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func RestoreTerminal(fd uintptr, state *State) error {
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(setTermios), uintptr(unsafe.Pointer(&state.termios)))
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return err
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}
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func SetRawTerminal(fd uintptr) (*State, error) {
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oldState, err := MakeRaw(fd)
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if err != nil {
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return nil, err
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}
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt)
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go func() {
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_ = <-c
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RestoreTerminal(fd, oldState)
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os.Exit(0)
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}()
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return oldState, err
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}
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func GetWinsize(fd uintptr) (*winsize, syscall.Errno) {
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ws := &winsize{}
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(ws)))
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return ws, err
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}
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func SetWinsize(fd uintptr, ws *winsize) syscall.Errno {
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_, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, uintptr(syscall.TIOCSWINSZ), uintptr(unsafe.Pointer(ws)))
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return err
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}
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func HandleResize(fd int) {
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sigs := make(chan os.Signal)
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signal.Notify(sigs, syscall.SIGWINCH)
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go func() {
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for {
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<-sigs
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handleSIGWINCH(fd)
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}
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}()
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handleSIGWINCH(fd)
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}
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func handleSIGWINCH(fd int) {
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ws, errno := GetWinsize(0)
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if errno != 0 {
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fmt.Printf("error reading winsize: %v\n", errno.Error())
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return
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}
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if errno := SetWinsize(uintptr(fd), ws); errno != 0 {
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fmt.Printf("error setting winsize: %v", errno.Error())
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}
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}
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