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// +build !windows
package pty
import (
"os"
"syscall"
"unsafe"
)
// Getsize returns the number of rows (lines) and cols (positions
// in each line) in terminal t.
func Getsize(t *os.File) (rows, cols int, err error) {
var ws winsize
err = getwindowrect(&ws, t.Fd())
return int(ws.ws_row), int(ws.ws_col), err
}
// Setsize sets the number of rows (lines) and cols (positions
// in each line) in terminal t. Both rows and cols have to be
// positive integers.
func Setsize(t *os.File, rows, cols int) error {
ws := winsize{
ws_col: uint16(cols),
ws_row: uint16(rows),
ws_xpixel: uint16(0), // not used
ws_ypixel: uint16(0), // not used
}
return setwindowrect(&ws, t.Fd())
}
type winsize struct {
ws_row uint16
ws_col uint16
ws_xpixel uint16
ws_ypixel uint16
}
func getwindowrect(ws *winsize, fd uintptr) error {
_, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
fd,
syscall.TIOCGWINSZ,
uintptr(unsafe.Pointer(ws)),
)
if errno != 0 {
return syscall.Errno(errno)
}
return nil
}
func setwindowrect(ws *winsize, fd uintptr) error {
_, _, errno := syscall.Syscall(
syscall.SYS_IOCTL,
fd,
syscall.TIOCSWINSZ,
uintptr(unsafe.Pointer(ws)),
)
if errno != 0 {
return syscall.Errno(errno)
}
return nil
}
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