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//go:build unix
package cli
import (
"os"
"syscall"
"unsafe"
)
// ttyWidth returns f's terminal column width via the TIOCGWINSZ ioctl, or 0
// if f isn't a terminal (redirected to a file/pipe, as in tests) or the
// ioctl fails.
func ttyWidth(f *os.File) int {
var ws struct {
Row, Col, Xpixel, Ypixel uint16
}
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, f.Fd(), syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&ws)))
if errno != 0 || ws.Col == 0 {
return 0
}
return int(ws.Col)
}
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