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Use IoctlGetWinsize to get term dimensions #1

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Oct 8, 2020
Merged

Use IoctlGetWinsize to get term dimensions #1

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22 changes: 2 additions & 20 deletions status/term.go
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Original file line number Diff line number Diff line change
Expand Up @@ -109,33 +109,15 @@ func (t *term) Clear(w io.Writer) {

// Dim returns the current dimensions of the terminal.
func (t *term) Dim() (width, height int) {
ws, err := getWinsize(t.fd)
ws, err := unix.IoctlGetWinsize(int(t.fd), unix.TIOCGWINSZ)
if err != nil {
return 80, 20
}
return int(ws.Width), int(ws.Height)
return int(ws.Col), int(ws.Row)
}

func isTerminal(fd uintptr) bool {
var t syscall.Termios
_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), termios, uintptr(unsafe.Pointer(&t)), 0, 0, 0)
return err == 0
}

type winsize struct {
Height, Width uint16
// We pad the struct to give us plenty of headroom. (In practice,
// darwin only has 8 additional bytes.) The proper way to do this
// would be to use cgo to get the proper struct definition, but I'd
// like to avoid this if possible.
Pad [128]byte
}

func getWinsize(fd uintptr) (*winsize, error) {
w := new(winsize)
_, _, err := unix.Syscall(syscall.SYS_IOCTL, fd, uintptr(unix.TIOCGWINSZ), uintptr(unsafe.Pointer(w)))
if err == 0 {
return w, nil
}
return w, err
}