Tolerate specifying -BoolParam 0 and similar

This is needed by vncserver which doesn't know which parameters are
boolean, and it cannot use the -Param=Value form as that isn't tolerated
by the Xorg code.

unix/xserver/hw/vnc/RFBGlue.cc

@@ -143,6 +143,22 @@ const char* vncGetParamDesc(const char *name)
   return param->getDescription();
 }
 
+int vncIsParamBool(const char *name)
+{
+  VoidParameter *param;
+  BoolParameter *bparam;
+
+  param = rfb::Configuration::getParam(name);
+  if (param == NULL)
+    return false;
+
+  bparam = dynamic_cast<BoolParameter*>(param);
+  if (bparam == NULL)
+    return false;
+
+  return true;
+}
+
 int vncGetParamCount(void)
 {
   int count;

unix/xserver/hw/vnc/RFBGlue.h

@@ -41,6 +41,7 @@ int vncSetParam(const char *name, const char *value);
 int vncSetParamSimple(const char *nameAndValue);
 char* vncGetParam(const char *name);
 const char* vncGetParamDesc(const char *name);
+int vncIsParamBool(const char *name);
 
 int vncGetParamCount(void);
 char *vncGetParamList(void);

unix/xserver/hw/vnc/xvnc.c

@@ -639,6 +639,20 @@ ddxProcessArgument(int argc, char *argv[], int i)
         exit(0);
     }
 
+    /* We need to resolve an ambiguity for booleans */
+    if (argv[i][0] == '-' && i+1 < argc &&
+        vncIsParamBool(&argv[i][1])) {
+        if ((strcasecmp(argv[i+1], "0") == 0) ||
+            (strcasecmp(argv[i+1], "1") == 0) ||
+            (strcasecmp(argv[i+1], "true") == 0) ||
+            (strcasecmp(argv[i+1], "false") == 0) ||
+            (strcasecmp(argv[i+1], "yes") == 0) ||
+            (strcasecmp(argv[i+1], "no") == 0)) {
+            vncSetParam(&argv[i][1], argv[i+1]);
+            return 2;
+        }
+    }
+
     if (vncSetParamSimple(argv[i]))
 	return 1;