[llgo] cmd/llgoi: use line editor

Summary:
This diff adds line-editing to llgoi, by
vendoring and using github.com/peterh/liner.
I have only implemented the basics here;
follow-ups will come later to add persisted
history, and completion,

Reviewers: pcc

Reviewed By: pcc

Subscribers: axw, llvm-commits

Differential Revision: http://reviews.llvm.org/D9811

llvm-svn: 238100

1 files changed, 39 insertions, 0 deletions

diff --git a/llgo/third_party/liner/bsdinput.go b/llgo/third_party/liner/bsdinput.go
new file mode 100644
index 00000000000..4b552d44d96
--- /dev/null
+++ b/llgo/third_party/liner/bsdinput.go
@@ -0,0 +1,39 @@
+// +build openbsd freebsd netbsd
+
+package liner
+
+import "syscall"
+
+const (
+	getTermios = syscall.TIOCGETA
+	setTermios = syscall.TIOCSETA
+)
+
+const (
+	// Input flags
+	inpck  = 0x010
+	istrip = 0x020
+	icrnl  = 0x100
+	ixon   = 0x200
+
+	// Output flags
+	opost = 0x1
+
+	// Control flags
+	cs8 = 0x300
+
+	// Local flags
+	isig   = 0x080
+	icanon = 0x100
+	iexten = 0x400
+)
+
+type termios struct {
+	Iflag  uint32
+	Oflag  uint32
+	Cflag  uint32
+	Lflag  uint32
+	Cc     [20]byte
+	Ispeed int32
+	Ospeed int32
+}