Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go b/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go
new file mode 100644
index 0000000..5cfdf8f
--- /dev/null
+++ b/vendor/golang.org/x/crypto/ssh/terminal/util_windows.go
@@ -0,0 +1,105 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build windows
+
+// Package terminal provides support functions for dealing with terminals, as
+// commonly found on UNIX systems.
+//
+// Putting a terminal into raw mode is the most common requirement:
+//
+// oldState, err := terminal.MakeRaw(0)
+// if err != nil {
+// panic(err)
+// }
+// defer terminal.Restore(0, oldState)
+package terminal
+
+import (
+ "os"
+
+ "golang.org/x/sys/windows"
+)
+
+type State struct {
+ mode uint32
+}
+
+// IsTerminal returns whether the given file descriptor is a terminal.
+func IsTerminal(fd int) bool {
+ var st uint32
+ err := windows.GetConsoleMode(windows.Handle(fd), &st)
+ return err == nil
+}
+
+// MakeRaw put the terminal connected to the given file descriptor into raw
+// mode and returns the previous state of the terminal so that it can be
+// restored.
+func MakeRaw(fd int) (*State, error) {
+ var st uint32
+ if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
+ return nil, err
+ }
+ raw := st &^ (windows.ENABLE_ECHO_INPUT | windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
+ if err := windows.SetConsoleMode(windows.Handle(fd), raw); err != nil {
+ return nil, err
+ }
+ return &State{st}, nil
+}
+
+// GetState returns the current state of a terminal which may be useful to
+// restore the terminal after a signal.
+func GetState(fd int) (*State, error) {
+ var st uint32
+ if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
+ return nil, err
+ }
+ return &State{st}, nil
+}
+
+// Restore restores the terminal connected to the given file descriptor to a
+// previous state.
+func Restore(fd int, state *State) error {
+ return windows.SetConsoleMode(windows.Handle(fd), state.mode)
+}
+
+// GetSize returns the visible dimensions of the given terminal.
+//
+// These dimensions don't include any scrollback buffer height.
+func GetSize(fd int) (width, height int, err error) {
+ var info windows.ConsoleScreenBufferInfo
+ if err := windows.GetConsoleScreenBufferInfo(windows.Handle(fd), &info); err != nil {
+ return 0, 0, err
+ }
+ return int(info.Window.Right - info.Window.Left + 1), int(info.Window.Bottom - info.Window.Top + 1), nil
+}
+
+// ReadPassword reads a line of input from a terminal without local echo. This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, error) {
+ var st uint32
+ if err := windows.GetConsoleMode(windows.Handle(fd), &st); err != nil {
+ return nil, err
+ }
+ old := st
+
+ st &^= (windows.ENABLE_ECHO_INPUT)
+ st |= (windows.ENABLE_PROCESSED_INPUT | windows.ENABLE_LINE_INPUT | windows.ENABLE_PROCESSED_OUTPUT)
+ if err := windows.SetConsoleMode(windows.Handle(fd), st); err != nil {
+ return nil, err
+ }
+
+ defer windows.SetConsoleMode(windows.Handle(fd), old)
+
+ var h windows.Handle
+ p, _ := windows.GetCurrentProcess()
+ if err := windows.DuplicateHandle(p, windows.Handle(fd), p, &h, 0, false, windows.DUPLICATE_SAME_ACCESS); err != nil {
+ return nil, err
+ }
+
+ f := os.NewFile(uintptr(h), "stdin")
+ defer f.Close()
+ return readPasswordLine(f)
+}