//go:build darwin

package main

import (
  "os"
  "syscall"
  "unsafe"
)

func termWidth() int {
  var ws struct{ Row, Col, Xpixel, Ypixel uint16 }
  _, _, e := syscall.Syscall(syscall.SYS_IOCTL, uintptr(os.Stdin.Fd()), syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&ws)))
  if e != 0 || ws.Col == 0 {
    return 80
  }
  return int(ws.Col)
}

func isTerminal(fd int) bool {
  var t syscall.Termios
  _, _, e := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TIOCGETA, uintptr(unsafe.Pointer(&t)))
  return e == 0
}

func makeRaw(fd int) (func(), error) {
  var old syscall.Termios
  if _, _, e := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TIOCGETA, uintptr(unsafe.Pointer(&old))); e != 0 {
    return nil, e
  }
  raw := old
  raw.Iflag &^= syscall.ICRNL | syscall.IXON | syscall.BRKINT | syscall.INPCK | syscall.ISTRIP
  raw.Oflag &^= syscall.OPOST
  raw.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.ISIG | syscall.IEXTEN
  raw.Cflag |= syscall.CS8
  if _, _, e := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TIOCSETA, uintptr(unsafe.Pointer(&raw))); e != 0 {
    return nil, e
  }
  return func() {
    syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), syscall.TIOCSETA, uintptr(unsafe.Pointer(&old)))
  }, nil
}