From 23ef281842928bc1a0d4a71660daa708068be292 Mon Sep 17 00:00:00 2001
From: Garrett D'Amore <garrett@damore.org>
Date: Sun, 1 Nov 2015 20:50:14 -0800
Subject: [PATCH] fixes #67 Use SYS_IOCTL interface on darwin

---
 tscreen_darwin.go | 153 ++++++++++++++++++++++++++++++++++++++++++++++
 tscreen_posix.go  |   2 +-
 2 files changed, 154 insertions(+), 1 deletion(-)
 create mode 100644 tscreen_darwin.go

diff --git a/tscreen_darwin.go b/tscreen_darwin.go
new file mode 100644
index 0000000..3fc8eb2
--- /dev/null
+++ b/tscreen_darwin.go
@@ -0,0 +1,153 @@
+// +build darwin
+
+// Copyright 2015 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+type termiosPrivate syscall.Termios
+
+func (t *tScreen) termioInit() error {
+	var e error
+	var newtios termiosPrivate
+	var fd uintptr
+	var tios uintptr
+	var ioc uintptr
+	t.tiosp = &termiosPrivate{}
+
+	if t.in, e = os.OpenFile("/dev/tty", os.O_RDONLY, 0); e != nil {
+		goto failed
+	}
+	if t.out, e = os.OpenFile("/dev/tty", os.O_WRONLY, 0); e != nil {
+		goto failed
+	}
+
+	tios = uintptr(unsafe.Pointer(t.tiosp))
+	ioc = uintptr(syscall.TIOCGETA)
+	fd = uintptr(t.out.Fd())
+	if _, _, e1 := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0); e1 != 0 {
+		e = e1
+		goto failed
+	}
+
+	// On this platform (FreeBSD and family), the baud rate is stored
+	// directly as an integer in termios.c_ospeed.  No bitmasking required.
+	t.baud = int(t.tiosp.Ospeed)
+	newtios = *t.tiosp
+	newtios.Iflag &^= syscall.IGNBRK | syscall.BRKINT | syscall.PARMRK |
+		syscall.ISTRIP | syscall.INLCR | syscall.IGNCR |
+		syscall.ICRNL | syscall.IXON
+	newtios.Oflag &^= syscall.OPOST
+	newtios.Lflag &^= syscall.ECHO | syscall.ECHONL | syscall.ICANON |
+		syscall.ISIG | syscall.IEXTEN
+	newtios.Cflag &^= syscall.CSIZE | syscall.PARENB
+	newtios.Cflag |= syscall.CS8
+
+	// We wake up at the earliest of 100 msec or when data is received.
+	// We need to wake up frequently to permit us to exit cleanly and
+	// close file descriptors on systems like Darwin, where close does
+	// cause a wakeup.  (Probably we could reasonably increase this to
+	// something like 1 sec or 500 msec.)
+	newtios.Cc[syscall.VMIN] = 0
+	newtios.Cc[syscall.VTIME] = 1
+	tios = uintptr(unsafe.Pointer(&newtios))
+
+	ioc = uintptr(syscall.TIOCSETA)
+	if _, _, e1 := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0); e1 != 0 {
+		e = e1
+		goto failed
+	}
+
+	signal.Notify(t.sigwinch, syscall.SIGWINCH)
+
+	if w, h, e := t.getWinSize(); e == nil && w != 0 && h != 0 {
+		t.cells.Resize(w, h)
+	}
+
+	return nil
+
+failed:
+	if t.in != nil {
+		t.in.Close()
+	}
+	if t.out != nil {
+		t.out.Close()
+	}
+	return e
+}
+
+func (t *tScreen) termioFini() {
+
+	signal.Stop(t.sigwinch)
+
+	<-t.indoneq
+
+	if t.out != nil {
+		fd := uintptr(t.out.Fd())
+		ioc := uintptr(syscall.TIOCSETAF)
+		tios := uintptr(unsafe.Pointer(t.tiosp))
+		syscall.Syscall6(syscall.SYS_IOCTL, fd, ioc, tios, 0, 0, 0)
+		t.out.Close()
+	}
+	if t.in != nil {
+		t.in.Close()
+	}
+}
+
+func (t *tScreen) getCharset() string {
+	// Let's also determine the character set.  This can help us later.
+	// Per POSIX, we search for LC_ALL first, then LC_CTYPE, and
+	// finally LANG.  First one set wins.
+	locale := ""
+	if locale = os.Getenv("LC_ALL"); locale == "" {
+		if locale = os.Getenv("LC_CTYPE"); locale == "" {
+			locale = os.Getenv("LANG")
+		}
+	}
+	if locale == "POSIX" || locale == "C" {
+		return "US-ASCII"
+	}
+	if i := strings.IndexRune(locale, '@'); i >= 0 {
+		locale = locale[:i]
+	}
+	if i := strings.IndexRune(locale, '.'); i >= 0 {
+		locale = locale[i+1:]
+	}
+	if locale == "" {
+		return "UTF-8"
+	}
+	// XXX: add support for aliases
+	return locale
+}
+
+func (t *tScreen) getWinSize() (int, int, error) {
+
+	fd := uintptr(t.out.Fd())
+	dim := [4]uint16{}
+	dimp := uintptr(unsafe.Pointer(&dim))
+	ioc := uintptr(syscall.TIOCGWINSZ)
+	if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL,
+		fd, ioc, dimp, 0, 0, 0); err != 0 {
+		return -1, -1, err
+	}
+	return int(dim[1]), int(dim[0]), nil
+}
diff --git a/tscreen_posix.go b/tscreen_posix.go
index 55b6f25..125d4bf 100644
--- a/tscreen_posix.go
+++ b/tscreen_posix.go
@@ -1,4 +1,4 @@
-// +build !windows,!nacl,!plan9
+// +build !windows,!nacl,!plan9,!darwin
 
 // Copyright 2015 The TCell Authors
 //