log: expose wl_debug_handler for custom print debug message

issue: https://gitlab.freedesktop.org/wayland/wayland/-/issues/534
Signed-off-by: guoyao <guoyao@uniontech.com>

src/connection.c

@@ -1585,7 +1585,7 @@ wl_closure_print(struct wl_closure *closure, struct wl_object *target,
 	fprintf(f, ")\n");
 
 	if (fclose(f) == 0) {
-		fprintf(stderr, "%s", buffer);
+		wl_debug("%s", buffer);
 		free(buffer);
 	}
 }

src/wayland-client-core.h

@@ -312,6 +312,9 @@ wl_display_read_events(struct wl_display *display);
 void
 wl_log_set_handler_client(wl_log_func_t handler);
 
+void
+wl_debug_set_handler_client(wl_debug_func_t handler);
+
 void
 wl_display_set_max_buffer_size(struct wl_display *display,
                                size_t max_buffer_size);

src/wayland-client.c

@@ -2719,6 +2719,12 @@ wl_proxy_wrapper_destroy(void *proxy_wrapper)
 	free(wrapper);
 }
 
+WL_EXPORT void
+wl_debug_set_handler_client(wl_debug_func_t handler)
+{
+	wl_debug_handler = handler;
+}
+
 WL_EXPORT void
 wl_log_set_handler_client(wl_log_func_t handler)
 {

src/wayland-private.h

@@ -236,7 +236,9 @@ void
 wl_closure_destroy(struct wl_closure *closure);
 
 extern wl_log_func_t wl_log_handler;
+extern wl_debug_func_t wl_debug_handler;
 
+void wl_debug(const char *fmt, ...);
 void wl_log(const char *fmt, ...);
 void wl_abort(const char *fmt, ...);
 

src/wayland-server-core.h

@@ -696,6 +696,9 @@ wl_shm_buffer_create(struct wl_client *client,
 void
 wl_log_set_handler_server(wl_log_func_t handler);
 
+void
+wl_debug_set_handler_server(wl_debug_func_t handler);
+
 enum wl_protocol_logger_type {
 	WL_PROTOCOL_LOGGER_REQUEST,
 	WL_PROTOCOL_LOGGER_EVENT,

src/wayland-server.c

@@ -2052,6 +2052,12 @@ wl_resource_create(struct wl_client *client,
 	return resource;
 }
 
+WL_EXPORT void
+wl_debug_set_handler_server(wl_debug_func_t handler)
+{
+	wl_debug_handler = handler;
+}
+
 WL_EXPORT void
 wl_log_set_handler_server(wl_log_func_t handler)
 {

src/wayland-util.c

@@ -452,8 +452,19 @@ wl_log_stderr_handler(const char *fmt, va_list arg)
 	vfprintf(stderr, fmt, arg);
 }
 
+wl_debug_func_t wl_debug_handler = wl_log_stderr_handler;
 wl_log_func_t wl_log_handler = wl_log_stderr_handler;
 
+void
+wl_debug(const char *fmt, ...)
+{
+	va_list argp;
+
+	va_start(argp, fmt);
+	wl_debug_handler(fmt, argp);
+	va_end(argp);
+}
+
 void
 wl_log(const char *fmt, ...)
 {

src/wayland-util.h

@@ -739,6 +739,7 @@ typedef int (*wl_dispatcher_func_t)(const void *user_data, void *target,
  * \sa wl_log_set_handler_server
  */
 typedef void (*wl_log_func_t)(const char *fmt, va_list args) WL_PRINTF(1, 0);
+typedef wl_log_func_t wl_debug_func_t;
 
 /**
  * Return value of an iterator function