From 359f59aef558076fb5519cfec6a7cd64339ee260 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 1 Oct 2016 14:22:10 -0700
Subject: [PATCH] Fixed bug 3130 - Spacebar not responding

Alex Baines

Make sure group is valid before passing it to XkbKeysymToKeycode.
---
 src/video/x11/SDL_x11keyboard.c | 44 ++++++++++++++++++++++++++++++---
 src/video/x11/SDL_x11sym.h      |  3 +++
 src/video/x11/SDL_x11video.h    |  4 +++
 3 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/src/video/x11/SDL_x11keyboard.c b/src/video/x11/SDL_x11keyboard.c
index e16d9f178518b..4e7a848321a8c 100644
--- a/src/video/x11/SDL_x11keyboard.c
+++ b/src/video/x11/SDL_x11keyboard.c
@@ -179,14 +179,36 @@ X11_KeyCodeToSDLScancode(Display *display, KeyCode keycode)
 }
 
 static Uint32
-X11_KeyCodeToUcs4(Display *display, KeyCode keycode, unsigned char group)
+X11_KeyCodeToUcs4(SDL_VideoData *data, KeyCode keycode, unsigned char group)
 {
     KeySym keysym;
 
 #if SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM
-    keysym = X11_XkbKeycodeToKeysym(display, keycode, group, 0);
+    if (data->xkb) {
+        int num_groups     = XkbKeyNumGroups(data->xkb, keycode);
+        unsigned char info = XkbKeyGroupInfo(data->xkb, keycode);
+        
+        if (num_groups && group >= num_groups) {
+        
+            int action = XkbOutOfRangeGroupAction(info);
+            
+            if (action == XkbRedirectIntoRange) {
+                if ((group = XkbOutOfRangeGroupNumber(info)) >= num_groups) {
+                    group = 0;
+                }
+            } else if (action == XkbClampIntoRange) {
+                group = num_groups - 1;
+            } else {
+                group %= num_groups;
+            }
+        }
+    } else {
+        group = 0;
+    }
+
+    keysym = X11_XkbKeycodeToKeysym(data->display, keycode, group, 0);
 #else
-    keysym = X11_XKeycodeToKeysym(display, keycode, 0);
+    keysym = X11_XKeycodeToKeysym(data->display, keycode, 0);
 #endif
     if (keysym == NoSymbol) {
         return 0;
@@ -308,6 +330,12 @@ X11_UpdateKeymap(_THIS)
     
 #if SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM
     {
+        if (data->xkb) {
+            X11_XkbGetUpdatedMap(data->display, XkbAllClientInfoMask, data->xkb);
+        } else {
+            data->xkb = X11_XkbGetMap(data->display, XkbAllClientInfoMask, XkbUseCoreKbd);
+        }
+
         XkbStateRec state;
         if (X11_XkbGetState(data->display, XkbUseCoreKbd, &state) == Success) {
             group = state.group;
@@ -326,7 +354,7 @@ X11_UpdateKeymap(_THIS)
         }
 
         /* See if there is a UCS keycode for this scancode */
-        key = X11_KeyCodeToUcs4(data->display, (KeyCode)i, group);
+        key = X11_KeyCodeToUcs4(data, (KeyCode)i, group);
         if (key) {
             keymap[scancode] = key;
         } else {
@@ -360,6 +388,14 @@ X11_UpdateKeymap(_THIS)
 void
 X11_QuitKeyboard(_THIS)
 {
+    SDL_VideoData *data = (SDL_VideoData *) _this->driverdata;
+
+#if SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM
+    if (data->xkb) {
+        X11_XkbFreeClientMap(data->xkb, 0, True);
+    }
+#endif
+
 #ifdef SDL_USE_IBUS
     SDL_IBus_Quit();
 #endif
diff --git a/src/video/x11/SDL_x11sym.h b/src/video/x11/SDL_x11sym.h
index 1caf383a88749..d3af2aff1e1c1 100644
--- a/src/video/x11/SDL_x11sym.h
+++ b/src/video/x11/SDL_x11sym.h
@@ -175,6 +175,9 @@ SDL_X11_SYM(KeySym,XkbKeycodeToKeysym,(Display* a,unsigned int b,int c,int d),(a
 SDL_X11_SYM(KeySym,XkbKeycodeToKeysym,(Display* a,KeyCode b,int c,int d),(a,b,c,d),return)
 #endif
 SDL_X11_SYM(Status,XkbGetState,(Display* a,unsigned int b,XkbStatePtr c),(a,b,c),return)
+SDL_X11_SYM(Status,XkbGetUpdatedMap,(Display* a,unsigned int b,XkbDescPtr c),(a,b,c),return)
+SDL_X11_SYM(XkbDescPtr,XkbGetMap,(Display* a,unsigned int b,unsigned int c),(a,b,c),return)
+SDL_X11_SYM(void,XkbFreeClientMap,(XkbDescPtr a,unsigned int b, Bool c),(a,b,c),)
 #endif
 
 #if NeedWidePrototypes
diff --git a/src/video/x11/SDL_x11video.h b/src/video/x11/SDL_x11video.h
index 912cf483e7a71..d5b82447feace 100644
--- a/src/video/x11/SDL_x11video.h
+++ b/src/video/x11/SDL_x11video.h
@@ -129,6 +129,10 @@ typedef struct SDL_VideoData
     SDL_bool global_mouse_changed;
     SDL_Point global_mouse_position;
     Uint32 global_mouse_buttons;
+
+#if SDL_VIDEO_DRIVER_X11_HAS_XKBKEYCODETOKEYSYM
+    XkbDescPtr xkb;
+#endif
 } SDL_VideoData;
 
 extern SDL_bool X11_UseDirectColorVisuals(void);