完善 ewmh 扩展初始化

src/xcb/window.c

@@ -0,0 +1,26 @@
+#include "window.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <xcb/xcb_icccm.h>
+
+#include "xcb-private.h"
+
+void set_window_class_instance(xcb_window_t window, const char *class,
+                               const char *instance) {
+  size_t class_length = strlen(class) + 1;
+  size_t instance_length = strlen(instance) + 1;
+  size_t length = class_length + instance_length;
+
+  char *str = malloc(length * sizeof(char));
+  for (size_t i = 0; i < length; i++) {
+    if (i < class_length) {
+      str[i] = class[i];
+    } else {
+      str[i] = instance[i - class_length];
+    }
+  }
+
+  xcb_icccm_set_wm_class(conn, window, length, str);
+  free(str);
+}