windows: add SetConsoleMode and GetConsoleScreenBufferInfo

Add the SetConsoleMode and GetConsoleScreenBufferInfo functions, as well
as the corresponding types and constants. For details see:

  https://docs.microsoft.com/en-us/windows/console/setconsolemode
  https://docs.microsoft.com/en-us/windows/console/getconsolescreenbufferinfo
  https://docs.microsoft.com/en-us/windows/console/console-screen-buffer-info-str

Change-Id: I17dcd62ffde12b5c94e1245b6836d067aea3dc6e
Reviewed-on: https://go-review.googlesource.com/52670
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

windows/syscall_windows.go

@@ -176,6 +176,8 @@ func NewCallbackCDecl(fn interface{}) uintptr
 //sys	RegQueryValueEx(key Handle, name *uint16, reserved *uint32, valtype *uint32, buf *byte, buflen *uint32) (regerrno error) = advapi32.RegQueryValueExW
 //sys	getCurrentProcessId() (pid uint32) = kernel32.GetCurrentProcessId
 //sys	GetConsoleMode(console Handle, mode *uint32) (err error) = kernel32.GetConsoleMode
+//sys	SetConsoleMode(console Handle, mode uint32) (err error) = kernel32.SetConsoleMode
+//sys	GetConsoleScreenBufferInfo(console Handle, info *ConsoleScreenBufferInfo) (err error) = kernel32.GetConsoleScreenBufferInfo
 //sys	WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) = kernel32.WriteConsoleW
 //sys	ReadConsole(console Handle, buf *uint16, toread uint32, read *uint32, inputControl *byte) (err error) = kernel32.ReadConsoleW
 //sys	CreateToolhelp32Snapshot(flags uint32, processId uint32) (handle Handle, err error) [failretval==InvalidHandle] = kernel32.CreateToolhelp32Snapshot

windows/zsyscall_windows.go

@@ -161,6 +161,8 @@ var (
 	procRegQueryValueExW                   = modadvapi32.NewProc("RegQueryValueExW")
 	procGetCurrentProcessId                = modkernel32.NewProc("GetCurrentProcessId")
 	procGetConsoleMode                     = modkernel32.NewProc("GetConsoleMode")
+	procSetConsoleMode                     = modkernel32.NewProc("SetConsoleMode")
+	procGetConsoleScreenBufferInfo         = modkernel32.NewProc("GetConsoleScreenBufferInfo")
 	procWriteConsoleW                      = modkernel32.NewProc("WriteConsoleW")
 	procReadConsoleW                       = modkernel32.NewProc("ReadConsoleW")
 	procCreateToolhelp32Snapshot           = modkernel32.NewProc("CreateToolhelp32Snapshot")
@@ -1629,6 +1631,30 @@ func GetConsoleMode(console Handle, mode *uint32) (err error) {
 	return
 }
 
+func SetConsoleMode(console Handle, mode uint32) (err error) {
+	r1, _, e1 := syscall.Syscall(procSetConsoleMode.Addr(), 2, uintptr(console), uintptr(mode), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
+func GetConsoleScreenBufferInfo(console Handle, info *ConsoleScreenBufferInfo) (err error) {
+	r1, _, e1 := syscall.Syscall(procGetConsoleScreenBufferInfo.Addr(), 2, uintptr(console), uintptr(unsafe.Pointer(&info)), 0)
+	if r1 == 0 {
+		if e1 != 0 {
+			err = errnoErr(e1)
+		} else {
+			err = syscall.EINVAL
+		}
+	}
+	return
+}
+
 func WriteConsole(console Handle, buf *uint16, towrite uint32, written *uint32, reserved *byte) (err error) {
 	r1, _, e1 := syscall.Syscall6(procWriteConsoleW.Addr(), 5, uintptr(console), uintptr(unsafe.Pointer(buf)), uintptr(towrite), uintptr(unsafe.Pointer(written)), uintptr(unsafe.Pointer(reserved)), 0)
 	if r1 == 0 {

windows/ztypes_windows.go

@@ -1233,3 +1233,50 @@ const (
 	IfOperStatusNotPresent     = 6
 	IfOperStatusLowerLayerDown = 7
 )
+
+// Console related constants used for the mode parameter to SetConsoleMode. See
+// https://docs.microsoft.com/en-us/windows/console/setconsolemode for details.
+
+const (
+	ENABLE_PROCESSED_INPUT        = 0x1
+	ENABLE_LINE_INPUT             = 0x2
+	ENABLE_ECHO_INPUT             = 0x4
+	ENABLE_WINDOW_INPUT           = 0x8
+	ENABLE_MOUSE_INPUT            = 0x10
+	ENABLE_INSERT_MODE            = 0x20
+	ENABLE_QUICK_EDIT_MODE        = 0x40
+	ENABLE_EXTENDED_FLAGS         = 0x80
+	ENABLE_AUTO_POSITION          = 0x100
+	ENABLE_VIRTUAL_TERMINAL_INPUT = 0x200
+
+	ENABLE_PROCESSED_OUTPUT            = 0x1
+	ENABLE_WRAP_AT_EOL_OUTPUT          = 0x2
+	ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x4
+	DISABLE_NEWLINE_AUTO_RETURN        = 0x8
+	ENABLE_LVB_GRID_WORLDWIDE          = 0x10
+)
+
+type Coord struct {
+	X int16
+	Y int16
+}
+
+type SmallRect struct {
+	Left   int16
+	Top    int16
+	Right  int16
+	Bottom int16
+}
+
+// Used with GetConsoleScreenBuffer to retreive information about a console
+// screen buffer. See
+// https://docs.microsoft.com/en-us/windows/console/console-screen-buffer-info-str
+// for details.
+
+type ConsoleScreenBufferInfo struct {
+	Size              Coord
+	CursorPosition    Coord
+	Attributes        uint16
+	Window            SmallRect
+	MaximumWindowSize Coord
+}