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wkb-mini.c
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wkb-mini.c
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/*
Copyright (C) 2016-2022 Dimitar Toshkov Zhekov <dimitar.zhekov@gmail.com>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
static const char *const PROGRAM_NAME = "wkb-mini";
#include "program-inc.c"
#include <ctype.h>
#include <tlhelp32.h>
#define WKB_MINI_DLL __declspec(dllimport)
#include "wkb-hook.h"
#include "wkb-mwow.h"
static inline BOOL keyPressed(BYTE key) { return (GetAsyncKeyState(key) & 0x8000) != 0; }
static inline BOOL winKeyPressed(void) { return keyPressed(VK_LWIN) || keyPressed(VK_RWIN); }
static inline int windowClassEql(HWND hwnd, const char *className)
{
char buffer[0x80];
return GetClassName(hwnd, buffer, sizeof buffer) && strcmp(buffer, className) == 0;
}
static inline BOOL consoleWindow(HWND hWnd) { return windowClassEql(hWnd, "ConsoleWindowClass"); }
static inline void toggleScroll(void)
{
// A real scan code can never be 0xE0, that's the extended-key scan code prefix.
keybd_event(VK_SCROLL, 0xE0, KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(VK_SCROLL, 0xE0, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}
static BOOL lockScroll = TRUE;
static inline void clearScroll(void)
{
if (lockScroll && (GetKeyState(VK_SCROLL) & 0x01))
toggleScroll();
}
static inline void sendAsyncMessage(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
SendMessageTimeout(hWnd, message, wParam, lParam, SMTO_NORMAL, 40, NULL);
}
static UINT layoutMessage;
static inline void changeLayout(HWND hWnd, LPARAM layout)
{
// layoutMessage doesn't work for the XP (only?) console, even
// if the proper thread is used, but a CHANGEREQUEST works AFAICT.
sendAsyncMessage(hWnd, consoleWindow(hWnd) ? WM_INPUTLANGCHANGEREQUEST : layoutMessage, 0, layout);
}
static BOOL notModifiedExcept(BYTE exc1, BYTE exc2)
{
enum { MODIFIER_KEYS_COUNT = 8 };
static const BYTE modifierKeys[MODIFIER_KEYS_COUNT] =
{
VK_LMENU, VK_RMENU, VK_LCONTROL, VK_RCONTROL, VK_LWIN, VK_RWIN,
VK_LSHIFT, VK_RSHIFT
};
for (int i = 0; i < MODIFIER_KEYS_COUNT; i++)
{
BYTE key = modifierKeys[i];
if (key != exc1 && key != exc2 && keyPressed(key))
return FALSE;
}
return TRUE;
}
static BOOL pureToggle = FALSE, tabPressed = FALSE;
static LRESULT CALLBACK mouseLLProc(INT nCode, WPARAM wParam, LPARAM lParam)
{
// The opposite is not true: MB+toggle switches the layout in all Windows-es.
if (nCode == HC_ACTION && (wParam == WM_LBUTTONDOWN || wParam == WM_RBUTTONDOWN ||
wParam == WM_MBUTTONDOWN || wParam == WM_XBUTTONDOWN))
{
pureToggle = FALSE;
}
return CallNextHookEx(0, nCode, wParam, lParam);
}
static unsigned toggleKey = VK_APPS, shiftKey = VK_APPS;
static int timerDelay = 0;
static HWND lastFocus = NULL;
static inline BOOL shouldRetainPress(BYTE key)
{
switch (key)
{
case VK_LCONTROL :
case VK_RCONTROL :
case VK_LSHIFT :
case VK_RSHIFT : return key != shiftKey;
case VK_CAPITAL :
case VK_SNAPSHOT : return key != shiftKey && !pureToggle;
default : return FALSE;
}
}
static inline BOOL shouldRetainRelease(BYTE key)
{
switch (key)
{
case VK_LWIN : // fix Win state on 10 (8?) Win-L
case VK_RWIN : return TRUE;
case VK_LMENU : // unblock M-Tab, M-state on <= 7
case VK_RMENU : return tabPressed || key != shiftKey;
default : return shouldRetainPress(key);
}
}
static BOOL isLockLogout(BYTE key)
{
return (key == 'L' &&
winKeyPressed() && notModifiedExcept(VK_LWIN, VK_RWIN)) ||
((key == VK_DELETE || key == VK_DECIMAL) &&
keyPressed(VK_MENU) && keyPressed(VK_CONTROL) && !keyPressed(VK_SHIFT) && !winKeyPressed());
}
static LRESULT CALLBACK keyboardLLProc(INT nCode, WPARAM wParam, LPARAM lParam)
{
BOOL wmKeyDown = wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN;
if (nCode == HC_ACTION && (wmKeyDown || wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
const KBDLLHOOKSTRUCT *const pkb = (const KBDLLHOOKSTRUCT *) lParam;
const BYTE key = pkb->vkCode;
if (key != VK_SCROLL || pkb->scanCode != 0xE0)
{
if (wmKeyDown && key != toggleKey)
pureToggle = FALSE;
if (key == toggleKey || key == shiftKey)
{
static BOOL toggleDown = FALSE, shiftDown = FALSE;
static HWND shiftWindow = NULL;
if (wmKeyDown)
{
if (key == toggleKey && !toggleDown)
{
// The right Alt may set a fake Left Control state.
BYTE secondIgnore = (key == VK_RMENU) ? VK_LCONTROL : toggleKey;
pureToggle = notModifiedExcept(toggleKey, secondIgnore);
toggleDown = TRUE;
}
if (key == shiftKey && !shiftDown)
{
shiftWindow = GetForegroundWindow();
changeLayout(shiftWindow, HKL_NEXT);
shiftDown = TRUE;
}
tabPressed = (key == VK_TAB);
if (!shouldRetainPress(key))
return TRUE;
}
else
{
BOOL toggleHeld = toggleDown;
BOOL shiftHeld = shiftDown;
// The layout change may cause a fake left Control release,
// so we need to update the key down states before that.
toggleDown &= (key != toggleKey);
shiftDown &= (key != shiftKey);
if (key == toggleKey && toggleHeld && pureToggle)
{
if (toggleKey != shiftKey)
changeLayout(GetForegroundWindow(), HKL_NEXT);
}
else if (key == shiftKey && shiftHeld)
{
changeLayout(shiftWindow, HKL_PREV);
shiftWindow = NULL;
}
if (!shouldRetainRelease(key))
return TRUE;
}
}
else if (wmKeyDown)
{
if (isLockLogout(key))
{
clearScroll();
timerDelay = 10; // give lock time to kick in
lastFocus = NULL;
}
else if (key == VK_TAB)
tabPressed = TRUE;
}
}
}
return CallNextHookEx(0, nCode, wParam, lParam);
}
static HWND wkbWindow;
static const char *const WKB_CLASS_NAME = "wkbMini83447E6D";
static const char *const WKB_WINDOW_NAME = "WkbMini45B95DF9";
static HHOOK hKeyboardLL, hMouseLL;
static HHOOK hWindowProc, hKeyboardProc;
static HINSTANCE hInstance, hLibrary;
static void connectLock(void)
{
wkbWindow = CreateWindow(WKB_CLASS_NAME, WKB_WINDOW_NAME, WS_OVERLAPPED, 1, 1, 1, 1, NULL, NULL, hInstance, NULL);
checkFunc("CreateWindow", wkbWindow != NULL);
ShowWindow(wkbWindow, SW_HIDE);
hKeyboardLL = SetWindowsHookEx(WH_KEYBOARD_LL, keyboardLLProc, hInstance, 0);
checkFunc("SetWindowsHookEx(WH_KEYBOARD_LL)", hKeyboardLL != NULL);
hMouseLL = SetWindowsHookEx(WH_MOUSE_LL, mouseLLProc, hInstance, 0);
hWindowProc = SetWindowsHookEx(WH_CALLWNDPROC, windowProc, hLibrary, 0);
checkFunc("SetWindowsHookEx(WH_CALLWNDPROC)", hWindowProc != NULL);
hKeyboardProc = SetWindowsHookEx(WH_KEYBOARD, keyboardProc, hLibrary, 0);
checkFunc("SetWindowsHookEx(WH_KEYBOARD)", hKeyboardProc != NULL);
}
static void disconnectHooks(void)
{
checkFunc("UnhookWindowsHookEx(hKeyboardLL)", UnhookWindowsHookEx(hKeyboardLL));
if (hMouseLL != NULL)
checkFunc("UnhookWindowsHookEx(hMouseLL)", UnhookWindowsHookEx(hMouseLL));
checkFunc("UnhookWindowsHookEx(hWindowProc)", UnhookWindowsHookEx(hWindowProc));
checkFunc("UnhookWindowsHookEx(hKeyboardProc)", UnhookWindowsHookEx(hKeyboardProc));
}
#include "wkb-proc-inc.c"
static void startWowHelper(void)
{
STARTUPINFO startupInfo = { 0 };
PROCESS_INFORMATION processInfo;
startupInfo.cb = sizeof startupInfo;
checkFunc("CreateProcess", CreateProcess(NULL, "wkb-mwow.exe " WOW_ARGUMENT, NULL, NULL, FALSE,
NORMAL_PRIORITY_CLASS, NULL, NULL, &startupInfo, &processInfo));
CloseHandle(processInfo.hThread);
CloseHandle(processInfo.hProcess);
}
static BOOL CALLBACK compareHWnd(HWND hwnd, LPARAM lParam)
{
return hwnd != (HWND) lParam;
}
static DWORD layoutThread = 0;
static void getConsoleThread(HWND focus)
{
// For the console layout, we need a thread that contains the foreground
// window, but is different from the window thread. Don't ask me why.
HANDLE snap = CreateToolhelp32Snapshot(TH32CS_SNAPTHREAD, 0);
if (snap != INVALID_HANDLE_VALUE)
{
THREADENTRY32 tentry;
tentry.dwSize = sizeof tentry;
if (Thread32First(snap, &tentry))
{
do
{
if (tentry.th32ThreadID && tentry.th32ThreadID != layoutThread &&
!EnumThreadWindows(tentry.th32ThreadID, compareHWnd, (LPARAM) focus))
{
layoutThread = tentry.th32ThreadID;
break;
}
} while (Thread32Next(snap, &tentry));
}
CloseHandle(snap);
}
}
static LONG regOpenUserKey(const char *name, PHKEY phKey, const LONG *allowedResults)
{
LONG result = RegOpenKeyEx(HKEY_CURRENT_USER, name, 0, KEY_QUERY_VALUE, phKey);
for (int i = 0; allowedResults[i] != result; i++)
if (allowedResults[i] == ERROR_SUCCESS)
fatal("RegOpenKeyEx(%s) failed with error code %ld.", name, (long) result);
return result;
}
enum { REG_BUFFER_SIZE = 11 };
static BOOL regReadString(HKEY hKey, const char *name, char *buffer, const char *where)
{
DWORD type, size = REG_BUFFER_SIZE;
LONG result = RegQueryValueEx(hKey, name, 0, &type, (BYTE *) buffer, &size);
if (result == ERROR_SUCCESS)
{
if (type != REG_SZ)
fatal("RegQueryValueEx(%s\\%s): invalid type", where, name);
if (*buffer == '\0')
fatal("RegQueryValueEx(%s\\%s): invalid value", where, name);
return TRUE;
}
else if (result != ERROR_FILE_NOT_FOUND)
fatal("RegQueryValueEx(%s\\%s) failed with error code %ld.", where, name, (long) result);
return FALSE;
}
static BOOL fixLayouts = FALSE;
static BOOL unloadWrongLayouts(void)
{
static const char *const PRELOAD_KEY = "Keyboard Layout\\Preload";
static const LONG allowedResults[] = { ERROR_FILE_NOT_FOUND, ERROR_PAGED_SYSTEM_RESOURCES, ERROR_SUCCESS };
HKEY hKey;
LONG result = regOpenUserKey(PRELOAD_KEY, &hKey, allowedResults);
if (result == ERROR_SUCCESS)
{
enum { MAX_LAYOUTS = 64 };
DWORD nUserLayouts;
WORD userLayouts[MAX_LAYOUTS];
for (nUserLayouts = 0; nUserLayouts <= MAX_LAYOUTS; nUserLayouts++)
{
char name[REG_BUFFER_SIZE];
char buffer[REG_BUFFER_SIZE];
char *endptr;
DWORD value;
itoa(nUserLayouts + 1, name, 10);
if (!regReadString(hKey, name, buffer, PRELOAD_KEY))
break;
value = strtoul(buffer, &endptr, 0x10);
if (strlen(buffer) > 8 || value == HKL_PREV || value == HKL_NEXT || *endptr != '\0')
fatal("RegQueryValueEx(%s\\%s): invalid value", PRELOAD_KEY, name);
if (nUserLayouts < MAX_LAYOUTS)
userLayouts[nUserLayouts] = LOWORD(value);
}
RegCloseKey(hKey);
if (nUserLayouts >= 1 && nUserLayouts <= MAX_LAYOUTS)
{
HKL unlockLayouts[MAX_LAYOUTS];
DWORD nUnlockLayouts = GetKeyboardLayoutList(MAX_LAYOUTS, unlockLayouts);
for (DWORD n = 0; n < nUnlockLayouts; n++)
{
if (n >= nUserLayouts)
UnloadKeyboardLayout(unlockLayouts[n]);
else if (LOWORD(unlockLayouts[n]) != userLayouts[n])
break;
}
}
}
return result != ERROR_PAGED_SYSTEM_RESOURCES;
}
static int wkbMainLoop(void)
{
HKL defaultLayout = GetKeyboardLayout(GetCurrentThreadId());
BOOL rc;
MSG msg;
while ((rc = GetMessage(&msg, NULL, 0, 0)) != 0 && rc != -1)
{
if (standardMainProc(&msg))
continue;
// JOURNALPLAYBACK is required for keybd_event()
HWND focus = getFocus(DESKTOP_HOOKCONTROL | DESKTOP_JOURNALPLAYBACK | DESKTOP_CREATEWINDOW);
if (focus != NULL)
{
if (fixLayouts && lastFocus == NULL && !unloadWrongLayouts())
{
timerDelay = 5;
continue;
}
if (lockScroll)
{
HKL layout;
if (focus != lastFocus)
{
layoutThread = GetWindowThreadProcessId(focus, NULL);
if (consoleWindow(focus))
getConsoleThread(focus);
}
layout = GetKeyboardLayout(layoutThread);
if (layout != 0 && (GetKeyState(VK_SCROLL) & 0x01) != (layout != defaultLayout))
toggleScroll();
}
}
lastFocus = focus;
}
return rc ? 1 : msg.wParam;
}
static int wkbMain(void)
{
WNDCLASS wkbClass = { 0 };
BOOL rc;
// WM_INPUTLANGCHANGEREQUEST does not work for many dialogs, especially if the user is not
// a full administrator. The idea for using a custom message is from Eugene's "keyla".
checkFunc("RegisterWindowMessage", (layoutMessage = RegisterWindowMessage(WKB_LAYOUT_MESSAGE)) != 0);
wkbClass.lpfnWndProc = wkbWindowProc;
wkbClass.hInstance = hInstance;
wkbClass.lpszClassName = WKB_CLASS_NAME;
checkFunc("RegisterClass", RegisterClass(&wkbClass) != (ATOM) 0);
hLibrary = GetModuleHandle("wkb-hook.dll");
connectLock();
startTimer();
startWowHelper();
rc = wkbMainLoop();
disconnectHooks();
clearScroll();
return rc;
}
enum { KEY_UNDEF = 0xFFFF };
static unsigned translateKey(const char *str)
{
static struct keyName
{
WPARAM key;
const char *name;
} keyNames[] =
{
{ VK_APPS, "Apps" },
{ VK_APPS, "Props" }, // for compatibility
{ VK_SCROLL, "Scroll" },
{ VK_RCONTROL, "RCtrl" },
{ VK_RMENU, "RAlt" },
{ VK_RWIN, "RWin" },
{ VK_RSHIFT, "RShift" },
{ VK_LCONTROL, "LCtrl" },
{ VK_LMENU, "LAlt" },
{ VK_LWIN, "LWin" },
{ VK_LSHIFT, "LShift" },
{ VK_PAUSE, "Pause" },
{ VK_CAPITAL, "Caps" },
{ VK_SNAPSHOT, "Print" },
{ 0, NULL }
};
int i = (str[0] == '0' && toupper(str[1]) == 'X') ? 2 : 0;
for (struct keyName *kn = keyNames; kn->name; kn++)
if (!_stricmp(str, kn->name))
return kn->key;
if (isxdigit(str[i]) && isxdigit(str[i + 1]) && str[i + 2] == '\0')
return strtoul(str + i, NULL, 0x10);
return KEY_UNDEF;
}
static const char *const USAGE =
"Usage: wkb-mini [/T:KEY] [/S:KEY] [/N|/I] [/O|/U]\n"
"\n"
"/T - switch layout key\n"
"/S - shift-switch key\n"
"\n"
"KEY = Apps (Props), Scroll, RCtrl, RAlt, RWin, RShift, LCtrl, LAlt, LWin,\n"
"LShift, Pause, Caps, Print or a 2-digit winuser.h VK_ hex value (00 = none).\n"
"\n"
"Using LWin or RWin as a shift-switch key is NOT recommended.\n"
"\n"
"/N - Do not use the Scroll Lock led as a keyboard layout indicator,\n"
"/I - Use the Scroll Lock led as an indicator.\n"
"\n"
"/O - Do not unload layouts added by lock/unlock screen,\n"
"/U - Unload layouts added by lock/unlock screen."
"\n"
"/S:00 /T:00 /N /O - unload wkb-mini from memory.";
static const char *parseArguments(int argc, char **argv)
{
while (--argc > 0)
{
const char *const arg = *++argv;
if (arg[0] != '/')
return arg;
switch (toupper(arg[1]))
{
case '?' :
{
MessageBox(NULL, USAGE, PROGRAM_NAME, MB_OK);
ExitProcess(0);
}
case 'T' :
case 'S' :
{
unsigned *key = (toupper(arg[1]) == 'T') ? &toggleKey : &shiftKey;
if (arg[2] != ':' || (*key = translateKey(arg + 3)) == KEY_UNDEF)
return arg;
break;
}
case 'N' : lockScroll = FALSE; break;
case 'I' : lockScroll = TRUE; break;
case 'O' : fixLayouts = FALSE; break;
case 'U' : fixLayouts = TRUE; break;
default : return arg;
}
}
return NULL;
}
static const char *const WKB_LAYOUT_KEY = "Software\\WkbLayout";
static unsigned obtainKey(HKEY hKey, const char *name)
{
char buffer[REG_BUFFER_SIZE];
unsigned key = VK_APPS;
if (regReadString(hKey, name, buffer, "WkbLayout") && (key = translateKey(buffer)) == KEY_UNDEF)
fatal("RegQueryValueEx(%s\\%s): invalid value", WKB_LAYOUT_KEY, name);
return key;
}
static void readSettings(void)
{
static const LONG allowedResults[] = { ERROR_FILE_NOT_FOUND, ERROR_SUCCESS };
HKEY hKey;
if (regOpenUserKey(WKB_LAYOUT_KEY, &hKey, allowedResults) == ERROR_SUCCESS)
{
char buffer[REG_BUFFER_SIZE];
toggleKey = obtainKey(hKey, "ToggleKey");
shiftKey = obtainKey(hKey, "ShiftKey");
if (regReadString(hKey, "LedLight", buffer, WKB_LAYOUT_KEY))
lockScroll = _stricmp(buffer, "No");
if (regReadString(hKey, "FixLayouts", buffer, WKB_LAYOUT_KEY))
fixLayouts = !_stricmp(buffer, "Yes");
RegCloseKey(hKey);
}
}
static inline void findWkbWindows(HWND *windows)
{
windows[0] = FindWindow(WKB_CLASS_NAME, WKB_WINDOW_NAME);
windows[1] = FindWindow(WOW_CLASS_NAME, WOW_WINDOW_NAME);
}
// EnumWindows and all desktop functions may return FALSE without setting the last
// error (unless we consider values like 106, 6 and even 0 to be valid errors).
// So we avoid EnumWindows, and ignore/handle some FALSE-s instead of terminating.
static BOOL CALLBACK enumDesktop(LPSTR desktopName, LPARAM lParam)
{
HDESK desktop = OpenDesktop(desktopName, 0, FALSE, 0);
HWND *windows = (HWND *) lParam;
if (desktop)
{
if (SetThreadDesktop(desktop))
findWkbWindows(windows);
CloseHandle(desktop);
}
return windows[0] == NULL && windows[1] == NULL;
}
static BOOL unloadWkbs(void)
{
HDESK desktop = GetThreadDesktop(GetCurrentThreadId());
DWORD interval = getTimerInterval();
unsigned found = 0;
for (;;)
{
HWND windows[2] = { NULL, NULL };
EnumDesktops(GetProcessWindowStation(), enumDesktop, (LPARAM) windows);
SetThreadDesktop(desktop);
if (windows[0] == NULL && windows[1] == NULL)
findWkbWindows(windows);
if (windows[0] == NULL && windows[1] == NULL)
break;
if (found++ == 5)
{
fatal("Failed to unload %s from memory.\n"
"You may need administrator rights.",
windows[0] != NULL ? "wkb-mini" : "wkb-mwow");
}
if (windows[0] != NULL)
sendAsyncMessage(windows[0], WM_CLOSE, 0, 0);
if (windows[1] != NULL)
sendAsyncMessage(windows[1], WM_CLOSE, 0, 0);
Sleep(interval + 10);
}
CloseHandle(desktop);
return found > 0;
}
int CALLBACK WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
BOOL applyArg = (__argc == 2) && !strcmp(__argv[1], "/wkb:apply");
const char *badArgument;
BOOL anyUnloaded;
(void) hPrevInstance;
(void) lpCmdLine;
(void) nCmdShow;
readSettings();
if (!applyArg && (badArgument = parseArguments(__argc, __argv)) != NULL)
fatal("Invalid argument: %s", badArgument);
anyUnloaded = unloadWkbs();
hInstance = hThisInstance;
// Don't start if (a) nothing to do or (b) apply only, and there were no WKB-s running.
return (toggleKey || shiftKey || lockScroll || fixLayouts) && (!applyArg || anyUnloaded) ? wkbMain() : 0;
}