Check rfbGetScreen() return value everywhere.

This fixes a segfault when a server is invoked with the
'-help' commandline argument.

VisualNaCro/nacro.c

@@ -121,6 +121,8 @@ static rfbBool malloc_frame_buffer(rfbClient* cl)
 		res->client->frameBuffer=malloc(w*4*h);
 		
 		res->server=rfbGetScreen(NULL,NULL,w,h,8,3,4);
+		if(!res->server)
+                  return FALSE;
 		res->server->screenData=res;
 		res->server->port=res->listen_port;
 		res->server->frameBuffer=res->client->frameBuffer;

examples/backchannel.c

@@ -107,6 +107,8 @@ int main(int argc,char** argv)
 	rfbRegisterProtocolExtension(&backChannelExtension);
 
 	server=rfbGetScreen(&argc,argv,400,300,8,3,4);
+	if(!server)
+	  return 0;
 	server->frameBuffer=(char*)malloc(400*300*4);
 	rfbInitServer(server);           
 	rfbRunEventLoop(server,-1,FALSE);

examples/camera.c

@@ -133,6 +133,8 @@ int main(int argc,char** argv)
   long usec;
   
   rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,WIDTH,HEIGHT,8,3,BPP);
+  if(!server)
+    return 0;
   server->desktopName = "Live Video Feed Example";
   server->frameBuffer=(char*)malloc(WIDTH*HEIGHT*BPP);
   server->alwaysShared=(1==1);

examples/colourmaptest.c

@@ -7,7 +7,8 @@ int main(int argc,char** argv)
   uint8_t bytes[256*3];
 
   rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,256,256,8,1,1);
-
+  if(!server)
+    return 0;
   server->serverFormat.trueColour=FALSE;
   server->colourMap.count=256;
   server->colourMap.is16=FALSE;

examples/example.c

@@ -279,8 +279,9 @@ static void MakeRichCursor(rfbScreenInfoPtr rfbScreen)
 
 int main(int argc,char** argv)
 {
-  rfbScreenInfoPtr rfbScreen =
-    rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
+  rfbScreenInfoPtr rfbScreen = rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
+  if(!rfbScreen)
+    return 0;
   rfbScreen->desktopName = "LibVNCServer Example";
   rfbScreen->frameBuffer = (char*)malloc(maxx*maxy*bpp);
   rfbScreen->alwaysShared = TRUE;

examples/filetransfer.c

@@ -7,6 +7,8 @@
 int main(int argc,char** argv)
 {                                                                
   rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,400,300,8,3,4);
+  if(!server)
+    return 0;
   server->frameBuffer=(char*)malloc(400*300*4);
   rfbRegisterTightVNCFileTransferExtension();
   rfbInitServer(server);           

examples/fontsel.c

@@ -41,6 +41,9 @@ int main(int argc,char** argv)
   rfbScreenInfoPtr s=rfbGetScreen(&argc,argv,640,480,8,3,3);
   int i,j;
 
+  if(!s)
+    return 0;
+
   s->frameBuffer=(char*)malloc(640*480*3);
   rfbInitServer(s);
 

examples/mac.c

@@ -455,6 +455,8 @@ ScreenInit(int argc, char**argv)
 			   CGDisplayPixelsHigh(kCGDirectMainDisplay),
 			   bitsPerSample,
 			   CGDisplaySamplesPerPixel(kCGDirectMainDisplay),4);
+  if(!rfbScreen)
+    exit(0);
   rfbScreen->serverFormat.redShift = bitsPerSample*2;
   rfbScreen->serverFormat.greenShift = bitsPerSample*1;
   rfbScreen->serverFormat.blueShift = 0;

examples/pnmshow.c

@@ -65,6 +65,8 @@ int main(int argc,char** argv)
 
   /* initialize data for vnc server */
   rfbScreen = rfbGetScreen(&argc,argv,paddedWidth,height,8,(bitsPerPixelInFile+7)/8,bytesPerPixel);
+  if(!rfbScreen)
+    return 0;
   if(argc>1)
     rfbScreen->desktopName = argv[1];
   else

examples/pnmshow24.c

@@ -60,6 +60,8 @@ int main(int argc,char** argv)
 
   /* initialize data for vnc server */
   rfbScreen = rfbGetScreen(&argc,argv,paddedWidth,height,8,3,3);
+  if(!rfbScreen)
+    return 0;
   if(argc>1)
     rfbScreen->desktopName = argv[1];
   else

examples/simple.c

@@ -3,6 +3,8 @@
 int main(int argc,char** argv)
 {                                                                
   rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,400,300,8,3,4);
+  if(!server)
+    return 0;
   server->frameBuffer=(char*)malloc(400*300*4);
   rfbInitServer(server);           
   rfbRunEventLoop(server,-1,FALSE);

examples/simple15.c

@@ -9,7 +9,8 @@ int main(int argc,char** argv)
   uint16_t* f;
                          
   rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,400,300,5,3,2);
-
+  if(!server)
+    return 0;
   server->frameBuffer=(char*)malloc(400*300*2);
   f=(uint16_t*)server->frameBuffer;
   for(j=0;j<300;j++)

examples/vncev.c

@@ -112,6 +112,8 @@ static enum rfbNewClientAction newclient(rfbClientPtr cl)
 int main(int argc,char** argv)
 {
    rfbScreenInfoPtr s=rfbGetScreen(&argc,argv,width,height,8,1,1);
+   if(!s)
+     return 0;
    s->colourMap.is16=FALSE;
    s->colourMap.count=2;
    s->colourMap.data.bytes=(unsigned char*)"\xd0\xd0\xd0\x30\x01\xe0";

examples/zippy.c

@@ -27,6 +27,8 @@ int main (int argc, char **argv)
 	  return 1;
 	  
         server = rfbGetScreen (&argc, argv, maxx, maxy, 8, 3, bpp);
+        if(!server)
+          return 0;
 	server->desktopName = "Zippy das wundersquirrel\'s VNC server";
 	server->frameBuffer = (char*)malloc(maxx*maxy*bpp);
 	server->alwaysShared = TRUE;

test/cargstest.c

@@ -10,6 +10,9 @@ int main(int argc,char** argv)
 	rfbBool ret=0;
 
 	screen = rfbGetScreen(&fake_argc,fake_argv,1024,768,8,3,1);
+	if(!screen)
+          return 0;
+
 #define CHECK(a,b) if(screen->a!=b) { fprintf(stderr,#a " is %d (should be " #b ")\n",screen->a); ret=1; }
 	CHECK(width,1024);
 	CHECK(height,768);

test/copyrecttest.c

@@ -22,6 +22,8 @@ int main(int argc,char** argv)
   double r,phi=0;
   
   rfbScreenInfoPtr server=rfbGetScreen(&argc,argv,width,height,8,3,4);
+  if(!server)
+    return 0;
   server->frameBuffer=(char*)malloc(width*height*4);
   initBackground(server);
   server->deferUpdateTime=0;

test/cursortest.c

@@ -322,8 +322,10 @@ static void doptr(int buttonMask,int x,int y,rfbClientPtr cl)
 
 int main(int argc,char** argv)
 {
-	rfbScreenInfoPtr rfbScreen =
-		rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
+	rfbScreenInfoPtr rfbScreen = rfbGetScreen(&argc,argv,maxx,maxy,8,3,bpp);
+        if(!rfbScreen)
+          return 0;
+
 	rfbScreen->desktopName = "Cursor Test";
 	rfbScreen->frameBuffer = (char*)malloc(maxx*maxy*bpp);
 	rfbScreen->ptrAddEvent = doptr;

test/encodingstest.c

@@ -298,6 +298,8 @@ int main(int argc,char** argv)
 
 	/* Initialize server */
 	server=rfbGetScreen(&argc,argv,width,height,8,3,4);
+        if(!server)
+          return 0;
 
 	server->frameBuffer=malloc(400*300*4);
 	server->cursor=NULL;