Fix support for evdev (#473875)

Following upstream commits:

Author: c2woody <c2woody>

Date:   Wed Dec 31 16:33:46 2008 +0000

    add evdev-kbd compatible scancode remapping (disabled atm)

Author: qbix79 <qbix79>

Date:   Thu Jan 22 13:14:33 2009 +0000

    Add experimental evdev detection.

Author: qbix79 <qbix79>

Date:   Thu Jan 22 21:44:14 2009 +0000

    counting is hard

diff -up dosbox-0.72/src/gui/sdl_mapper.cpp.evdev dosbox-0.72/src/gui/sdl_mapper.cpp

--- dosbox-0.72/src/gui/sdl_mapper.cpp.evdev	2007-08-17 14:49:56.000000000 -0400

+++ dosbox-0.72/src/gui/sdl_mapper.cpp	2009-03-08 21:41:46.000000000 -0400

@@ -1614,7 +1614,7 @@ static struct {

 static void change_action_text(const char* text,Bit8u col) {

-	bind_but.action->Change(text);

+	bind_but.action->Change(text,"");

 	bind_but.action->SetColor(col);

 }

@@ -2172,7 +2172,7 @@ static void CreateBindGroups(void) {

 		if (mapper.sticks.num) SDL_JoystickEventState(SDL_DISABLE);

 #else

 		// enable joystick event handling

-		if (numsticks) SDL_JoystickEventState(SDL_ENABLE);

+		if (mapper.sticks.num) SDL_JoystickEventState(SDL_ENABLE);

 		else return;

 #endif

 		Bit8u joyno=0;

@@ -2276,6 +2276,11 @@ void MAPPER_Init(void) {

 	if (!MAPPER_LoadBinds()) CreateDefaultBinds();

 }

+//Somehow including them at the top conflicts with something in setup.h

+#ifdef LINUX

+#include "SDL_syswm.h"

+#include <X11/XKBlib.h>

+#endif

 void MAPPER_StartUp(Section * sec) {

 	Section_prop * section=static_cast<Section_prop *>(sec);

 	mapper.sticks.num=0;

@@ -2292,7 +2297,7 @@ void MAPPER_StartUp(Section * sec) {

 		virtual_joysticks[0].axis_pos[i]=0;

 	}

-	usescancodes=false;

+	usescancodes = false;

 	if (section->Get_bool("usescancodes")) {

 		usescancodes=true;

@@ -2319,23 +2324,63 @@ void MAPPER_StartUp(Section * sec) {

 		sdlkey_map[0x5E]=SDLK_RALT;

 		sdlkey_map[0x40]=SDLK_KP5;

 		sdlkey_map[0x41]=SDLK_KP6;

-#elif !defined (WIN32) /* => Linux */

-		sdlkey_map[0x5a]=SDLK_UP;

-		sdlkey_map[0x60]=SDLK_DOWN;

-		sdlkey_map[0x5c]=SDLK_LEFT;

-		sdlkey_map[0x5e]=SDLK_RIGHT;

-		sdlkey_map[0x59]=SDLK_HOME;

-		sdlkey_map[0x5f]=SDLK_END;

-		sdlkey_map[0x5b]=SDLK_PAGEUP;

-		sdlkey_map[0x61]=SDLK_PAGEDOWN;

-		sdlkey_map[0x62]=SDLK_INSERT;

-		sdlkey_map[0x63]=SDLK_DELETE;

-		sdlkey_map[0x68]=SDLK_KP_DIVIDE;

-		sdlkey_map[0x64]=SDLK_KP_ENTER;

-		sdlkey_map[0x65]=SDLK_RCTRL;

-		sdlkey_map[0x66]=SDLK_PAUSE;

-		sdlkey_map[0x67]=SDLK_PRINT;

-		sdlkey_map[0x69]=SDLK_RALT;

+#elif !defined (WIN32) /* => Linux & BSDs */

+		//bool evdev_input = false;

+		bool evdev_input = true;

+#ifdef LINUX

+		SDL_SysWMinfo info;

+		SDL_VERSION(&info.version);

+		if (SDL_GetWMInfo(&info)) {

+			XkbDescPtr desc = NULL;

+			if((desc = XkbGetMap(info.info.x11.display,XkbAllComponentsMask,XkbUseCoreKbd))) {

+				if(XkbGetNames(info.info.x11.display,XkbAllNamesMask,desc) == 0) {

+					const char* keycodes = XGetAtomName(info.info.x11.display, desc->names->keycodes);

+//					const char* geom = XGetAtomName(info.info.x11.display, desc->names->geometry);

+					if(keycodes) {

+						LOG(LOG_MISC,LOG_NORMAL)("keyboard type %s",keycodes);

+						if (strncmp(keycodes,"evdev",5) == 0) evdev_input = true;

+					}

+					XkbFreeNames(desc,XkbAllNamesMask,True);

+				}

+			XkbFreeClientMap(desc,0,True);

+			}

+		}

+#endif

+		if (evdev_input) {

+			sdlkey_map[0x67]=SDLK_UP;

+			sdlkey_map[0x6c]=SDLK_DOWN;

+			sdlkey_map[0x69]=SDLK_LEFT;

+			sdlkey_map[0x6a]=SDLK_RIGHT;

+			sdlkey_map[0x66]=SDLK_HOME;

+			sdlkey_map[0x6b]=SDLK_END;

+			sdlkey_map[0x68]=SDLK_PAGEUP;

+			sdlkey_map[0x6d]=SDLK_PAGEDOWN;

+			sdlkey_map[0x6e]=SDLK_INSERT;

+			sdlkey_map[0x6f]=SDLK_DELETE;

+			sdlkey_map[0x62]=SDLK_KP_DIVIDE;

+			sdlkey_map[0x60]=SDLK_KP_ENTER;

+			sdlkey_map[0x61]=SDLK_RCTRL;

+			sdlkey_map[0x77]=SDLK_PAUSE;

+			sdlkey_map[0x63]=SDLK_PRINT;

+			sdlkey_map[0x64]=SDLK_RALT;

+		} else {

+			sdlkey_map[0x5a]=SDLK_UP;

+			sdlkey_map[0x60]=SDLK_DOWN;

+			sdlkey_map[0x5c]=SDLK_LEFT;

+			sdlkey_map[0x5e]=SDLK_RIGHT;

+			sdlkey_map[0x59]=SDLK_HOME;

+			sdlkey_map[0x5f]=SDLK_END;

+			sdlkey_map[0x5b]=SDLK_PAGEUP;

+			sdlkey_map[0x61]=SDLK_PAGEDOWN;

+			sdlkey_map[0x62]=SDLK_INSERT;

+			sdlkey_map[0x63]=SDLK_DELETE;

+			sdlkey_map[0x68]=SDLK_KP_DIVIDE;

+			sdlkey_map[0x64]=SDLK_KP_ENTER;

+			sdlkey_map[0x65]=SDLK_RCTRL;

+			sdlkey_map[0x66]=SDLK_PAUSE;

+			sdlkey_map[0x67]=SDLK_PRINT;

+			sdlkey_map[0x69]=SDLK_RALT;

+		}

 #else

 		sdlkey_map[0xc8]=SDLK_UP;

 		sdlkey_map[0xd0]=SDLK_DOWN;