添加布局算法并在新建窗口时应用规则

src/xcb/window.c

@@ -1,6 +1,7 @@
 #include "window.h"
 
 #include <stdbool.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ -34,6 +35,28 @@ void set_window_class_instance(xcb_window_t window, const char *class,
   free(str);
 }
 
+static char broken[] = "broken";
+
+void get_window_class_instance(xcb_window_t window,
+                               window_class_instance_t *class_instance) {
+  xcb_get_property_cookie_t cookie = xcb_icccm_get_wm_class(conn, window);
+  xcb_icccm_get_wm_class_reply_t prop;
+  const char *class = NULL;
+  const char *instance = NULL;
+  if (xcb_icccm_get_wm_class_reply(conn, cookie, &prop, NULL)) {
+    class = prop.class_name;
+    instance = prop.instance_name;
+  } else {
+    class = broken;
+    instance = broken;
+  }
+
+  strncpy(class_instance->class, class, LENGTH(class_instance->class));
+  strncpy(class_instance->instance, instance, LENGTH(class_instance->instance));
+
+  xcb_icccm_get_wm_class_reply_wipe(&prop);
+}
+
 typedef struct visual_t {
   uint8_t depth;
   xcb_visualtype_t *visual;
@@ -242,9 +265,8 @@ char *get_window_name(xcb_window_t window) {
   }
 
   {
-    const char *broken = "broken";
-    char *name = ecalloc(strlen(broken) + 1, sizeof(char));
-    strncpy(name, broken, strlen(broken));
+    char *name = ecalloc(LENGTH(broken), sizeof(char));
+    strncpy(name, broken, LENGTH(broken));
     return name;
   }
 }