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// +build linux darwin freebsd openbsd netbsd dragonfly
// Copyright 2013-2015 Bowery, Inc.
package prompt
import (
"os"
"unsafe"
"golang.org/x/sys/unix"
)
// winsize contains the size for the terminal.
type winsize struct {
rows uint16
cols uint16
_ uint32
}
// terminalSize retrieves the cols/rows for the terminal connected to out.
func terminalSize(out *os.File) (int, int, error) {
ws := new(winsize)
_, _, err := unix.Syscall(unix.SYS_IOCTL, out.Fd(),
uintptr(unix.TIOCGWINSZ), uintptr(unsafe.Pointer(ws)))
if err != 0 {
return 0, 0, err
}
return int(ws.cols), int(ws.rows), nil
}
// getTermios retrieves the termios settings for the terminal descriptor.
func getTermios(fd uintptr) (*unix.Termios, error) {
termios := new(unix.Termios)
_, _, err := unix.Syscall(unix.SYS_IOCTL, fd, tcgets,
uintptr(unsafe.Pointer(termios)))
if err != 0 {
return nil, err
}
return termios, nil
}
// setTermios sets the termios settings for the terminal descriptor,
// optionally flushing the buffer before setting.
func setTermios(fd uintptr, flush bool, mode *unix.Termios) error {
req := int64(tcsets)
if flush {
req = int64(tcsetsf)
}
_, _, err := unix.Syscall(unix.SYS_IOCTL, fd, uintptr(req),
uintptr(unsafe.Pointer(mode)))
if err != 0 {
return err
}
return nil
}
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