De-duplicate data source MIME types

types/data_device/wlr_data_source.c

@@ -190,16 +190,29 @@ static void data_source_offer(struct wl_client *client,
 			"wl_data_device.set_selection");
 	}
 
-	char **p = wl_array_add(&source->source.mime_types, sizeof(*p));
-	if (p) {
-		*p = strdup(mime_type);
+	const char **mime_type_ptr;
+	wl_array_for_each(mime_type_ptr, &source->source.mime_types) {
+		if (strcmp(*mime_type_ptr, mime_type) == 0) {
+			wlr_log(WLR_DEBUG, "Ignoring duplicate MIME type offer %s",
+				mime_type);
+			return;
+		}
 	}
-	if (!p || !*p) {
-		if (p) {
-			source->source.mime_types.size -= sizeof(*p);
+
+	char *dup_mime_type = strdup(mime_type);
+	if (dup_mime_type == NULL) {
+		wl_resource_post_no_memory(resource);
+		return;
 	}
+
+	char **p = wl_array_add(&source->source.mime_types, sizeof(*p));
+	if (p == NULL) {
+		free(dup_mime_type);
 		wl_resource_post_no_memory(resource);
+		return;
 	}
+
+	*p = dup_mime_type;
 }
 
 static const struct wl_data_source_interface data_source_impl = {

types/wlr_data_control_v1.c

@@ -5,6 +5,7 @@
 #include <unistd.h>
 #include <wlr/types/wlr_data_control_v1.h>
 #include <wlr/types/wlr_data_device.h>
+#include <wlr/util/log.h>
 #include "util/signal.h"
 #include "wlr-data-control-unstable-v1-protocol.h"
 
@@ -69,6 +70,15 @@ static void source_handle_offer(struct wl_client *client,
 		return;
 	}
 
+	const char **mime_type_ptr;
+	wl_array_for_each(mime_type_ptr, &source->source.mime_types) {
+		if (strcmp(*mime_type_ptr, mime_type) == 0) {
+			wlr_log(WLR_DEBUG, "Ignoring duplicate MIME type offer %s",
+				mime_type);
+			return;
+		}
+	}
+
 	char *dup_mime_type = strdup(mime_type);
 	if (dup_mime_type == NULL) {
 		wl_resource_post_no_memory(resource);

types/wlr_gtk_primary_selection.c

@@ -143,6 +143,15 @@ static void source_handle_offer(struct wl_client *client,
 		wlr_log(WLR_DEBUG, "Offering additional MIME type after set_selection");
 	}
 
+	const char **mime_type_ptr;
+	wl_array_for_each(mime_type_ptr, &source->source.mime_types) {
+		if (strcmp(*mime_type_ptr, mime_type) == 0) {
+			wlr_log(WLR_DEBUG, "Ignoring duplicate MIME type offer %s",
+				mime_type);
+			return;
+		}
+	}
+
 	char *dup_mime_type = strdup(mime_type);
 	if (dup_mime_type == NULL) {
 		wl_resource_post_no_memory(resource);