evdev: don't execute snprintf if not gonna print

Signed-off-by: Konstantin Kharlamov <Hi-Angel@yandex.ru>

src/evdev.h

@@ -713,6 +713,9 @@ evdev_log_msg(struct evdev_device *device,
 	va_list args;
 	char buf[1024];
 
+	if (!is_logged(evdev_libinput_context(device), priority))
+		return;
+
 	/* Anything info and above is user-visible, use the device name */
 	snprintf(buf,
 		 sizeof(buf),
@@ -741,6 +744,9 @@ evdev_log_msg_ratelimit(struct evdev_device *device,
 
 	enum ratelimit_state state;
 
+	if (!is_logged(evdev_libinput_context(device), priority))
+		return;
+
 	state = ratelimit_test(ratelimit);
 	if (state == RATELIMIT_EXCEEDED)
 		return;

src/libinput-private.h

@@ -404,6 +404,15 @@ typedef void (*libinput_source_dispatch_t)(void *data);
 #define log_bug_libinput_ratelimit(li_, r_, ...) log_msg_ratelimit((li_), (r_), LIBINPUT_LOG_PRIORITY_ERROR, "libinput bug: " __VA_ARGS__)
 #define log_bug_client_ratelimit(li_, r_, ...) log_msg_ratelimit((li_), (r_), LIBINPUT_LOG_PRIORITY_ERROR, "client bug: " __VA_ARGS__)
 
+static inline bool
+is_logged(const struct libinput *libinput,
+	  enum libinput_log_priority priority)
+{
+       return libinput->log_handler &&
+               libinput->log_priority <= priority;
+}
+
+
 void
 log_msg_ratelimit(struct libinput *libinput,
 		  struct ratelimit *ratelimit,

src/libinput.c

@@ -262,8 +262,7 @@ log_msg_va(struct libinput *libinput,
 	   const char *format,
 	   va_list args)
 {
-	if (libinput->log_handler &&
-	    libinput->log_priority <= priority)
+	if (is_logged(libinput, priority))
 		libinput->log_handler(libinput, priority, format, args);
 }