add XextHasExtension macro

1 files changed, 11 insertions, 2 deletions

diff --git a/xc/include/extensions/extutil.h b/xc/include/extensions/extutil.h
index 69fa18630..532b3c193 100644
--- a/xc/include/extensions/extutil.h
+++ b/xc/include/extensions/extutil.h
@@ -10,7 +10,16 @@ typedef struct _XExtDisplayInfo {
     caddr_t data;			/* extra data for extension to use */
 } XExtDisplayInfo;
 
-extern XExtDisplayInfo *XextInitDisplay();
+typedef struct _XExtensionInfo {
+    XExtDisplayInfo *head;		/* start of list */
+    XExtDisplayInfo *cur;		/* most recently used */
+    int ndisplays;			/* number of displays */
+} XExtensionInfo;
+
+extern XExtensionInfo *XextCreateExtension();
+extern void XextDestroyExtension();
+extern XExtDisplayInfo *XextAddDisplay();
+extern int XextRemoveDisplay();
 extern XExtDisplayInfo *XextFindDisplay();
-extern int XextCloseDisplay();
 
+#define XextHasExtension(i) ((i) && ((i)->codes))