Index: uspace/app/tester/vfs/vfs1.c
===================================================================
--- uspace/app/tester/vfs/vfs1.c	(revision 855e0d811a98ab099ac72bbad3f412912d809f2c)
+++ uspace/app/tester/vfs/vfs1.c	(revision 202f57b62cc63567ddf782a70c1504e930277141)
@@ -105,5 +105,5 @@
 	if (cnt < 0)
 		return "write() failed";
-	TPRINTF("Written %d bytes\n", cnt);
+	TPRINTF("Written %zd bytes\n", cnt);
 	
 	if (lseek(fd0, 0, SEEK_SET) != 0)
@@ -116,5 +116,11 @@
 			return "read() failed";
 		
-		TPRINTF("Read %d bytes: \".*s\"\n", cnt, cnt, buf);
+		int _cnt = (int) cnt;
+		if (_cnt != cnt) {
+			/* Count overflow, just to be sure. */
+			TPRINTF("Read %zd bytes\n", cnt);
+		} else {
+			TPRINTF("Read %zd bytes: \"%.*s\"\n", cnt, _cnt, buf);
+		}
 	}
 	
Index: uspace/app/top/screen.c
===================================================================
--- uspace/app/top/screen.c	(revision 855e0d811a98ab099ac72bbad3f412912d809f2c)
+++ uspace/app/top/screen.c	(revision 202f57b62cc63567ddf782a70c1504e930277141)
@@ -150,11 +150,15 @@
 	screen_get_pos(&c, &r);
 	
-	if (c < cols)
-		printf("%.*s", cols - c - 1, str);
+	if (c < cols) {
+		int pos = cols - c - 1;
+		printf("%.*s", pos, str);
+	}
 }
 
 static inline void print_global_head(data_t *data)
 {
-	printf("top - %02lu:%02lu:%02lu up %u days, %02u:%02u:%02u, load average:",
+	printf("top - %02lu:%02lu:%02lu up "
+	    "%" PRIun " days, %02" PRIun ":%02" PRIun ":%02" PRIun ", "
+	    "load average:",
 	    data->hours, data->minutes, data->seconds,
 	    data->udays, data->uhours, data->uminutes, data->useconds);
@@ -171,5 +175,5 @@
 static inline void print_task_summary(data_t *data)
 {
-	printf("tasks: %u total", data->tasks_count);
+	printf("tasks: %zu total", data->tasks_count);
 	screen_newline();
 }
@@ -211,6 +215,6 @@
 	}
 	
-	printf("threads: %u total, %u running, %u ready, %u sleeping, %u lingering, "
-	    "%u other, %u invalid",
+	printf("threads: %zu total, %zu running, %zu ready, "
+	    "%zu sleeping, %zu lingering, %zu other, %zu invalid",
 	    total, running, ready, sleeping, lingering, other, invalid);
 	screen_newline();
@@ -295,5 +299,5 @@
 		order_suffix(task->virtmem, &virtmem, &virtmem_suffix);
 		
-		printf("%-8" PRIu64 " %9u %8" PRIu64 "%c ", task->task_id,
+		printf("%-8" PRIu64 " %9zu %8" PRIu64 "%c ", task->task_id,
 		    task->threads, virtmem, virtmem_suffix);
 		print_percent(perc->virtmem, 2);