add support for eventstruct

eventstruct allows to use events as part of requests.
This is, e.g., needed by xcb_input_send_extension_event.

Signed-off-by: Christian Linhart <chris@demorecorder.com>

src/c_client.py

@@ -437,7 +437,11 @@ def _c_type_setup(self, name, postfix):
         first_field_after_varsized = None
 
         for field in self.fields:
-            field.c_field_type = _t(field.field_type)
+            if field.type.is_event:
+                field.c_field_type = _t(field.field_type + ('event',))
+            else:
+                field.c_field_type = _t(field.field_type)
+
             field.c_field_const_type = ('' if field.type.nmemb == 1 else 'const ') + field.c_field_type
             field.c_field_name = _cpp(field.field_name)
             field.c_subscript = '[%d]' % field.type.nmemb if (field.type.nmemb and field.type.nmemb > 1) else ''
@@ -3156,6 +3160,28 @@ def c_request(self, name):
     # TODO: what about aux helpers?
     _man_request(self, name, void=not self.reply, aux=False)
 
+
+def c_eventstruct(self, name):
+    #add fields that are needed to get the event-type in a generic way
+    self.fields.append( Field( tevent, tevent.name, 'event_header', False, True, True) )
+
+    if self.contains_ge_events:
+        #TODO: add header of ge-events as an extra field
+        raise Exception( 'eventstructs with ge-events are not yet supported' )
+
+    _c_type_setup(self, name, ())
+
+    #correct the format of the field names
+    for field in self.fields:
+        field.c_field_name = _n_item(field.c_field_name).lower()
+
+    _c_complex(self)
+    _c_iterator(self, name)
+
+    if not self.fixed_size():
+        #TODO: Create sizeof function (and maybe other accessors) for var-sized eventstructs
+        raise Exception( 'var sized eventstructs are not yet supported' )
+
 def c_event(self, name):
     '''
     Exported function that handles event declarations.
@@ -3253,6 +3279,7 @@ output = {'open'    : c_open,
           'struct'  : c_struct,
           'union'   : c_union,
           'request' : c_request,
+          'eventstruct' : c_eventstruct,
           'event'   : c_event,
           'error'   : c_error,
           }
@@ -3296,6 +3323,9 @@ Refer to the README file in xcb/proto for more info.
 ''')
     raise
 
+# predefined datatype globals.
+tevent = SimpleType(('xcb_raw_generic_event_t',), 32)
+
 # Ensure the man subdirectory exists
 try:
     os.mkdir('man')

src/xcb.h

@@ -142,6 +142,18 @@ typedef struct {
     uint32_t full_sequence;  /**< full sequence */
 } xcb_generic_event_t;
 
+/**
+ * @brief Raw Generic event.
+ *
+ * A generic event structure as used on the wire, i.e., without the full_sequence field
+ */
+typedef struct {
+    uint8_t   response_type;  /**< Type of the response */
+    uint8_t  pad0;           /**< Padding */
+    uint16_t sequence;       /**< Sequence number */
+    uint32_t pad[7];         /**< Padding */
+} xcb_raw_generic_event_t;
+
 /**
  * @brief GE event
  *