Clarify printf argument flags

examples/connection_tester.cpp

@@ -484,7 +484,7 @@ struct peer_conn
 		unsigned int length = read_uint32(ptr);
 		if (length > sizeof(buffer))
 		{
-			std::fprintf(stderr, "len: %d\n", length);
+			std::fprintf(stderr, "len: %u\n", length);
 			close("ERROR RECEIVE MESSAGE PREFIX: packet too big", error_code());
 			return;
 		}

simulation/setup_swarm.cpp

@@ -347,7 +347,7 @@ void setup_swarm(int num_nodes
 #if DEBUG_SWARM != 0
 							"[%d] "
 #endif
-							"%4d.%03d: %-25s %s\n"
+							"%4u.%03u: %-25s %s\n"
 #if DEBUG_SWARM != 0
 							, i
 #endif

simulation/test_optimistic_unchoke.cpp

@@ -134,7 +134,7 @@ TORRENT_TEST(optimistic_unchoke)
 					lt::time_duration d = lt::clock_type::now() - start_time;
 					std::uint32_t const millis = std::uint32_t(
 						lt::duration_cast<lt::milliseconds>(d).count());
-					printf("\x1b[35m%4d.%03d: [%d] %s (%d ms)\x1b[0m\n"
+					printf("\x1b[35m%4u.%03u: [%d] %s (%d ms)\x1b[0m\n"
 						, millis / 1000, millis % 1000, i, msg_str[msg]
 						, int(lt::duration_cast<lt::milliseconds>(cs.unchoke_duration).count()));
 				}

simulation/test_socks5.cpp

@@ -255,7 +255,7 @@ void test_udp_tracker(std::uint32_t const flags, socks_flags_t const sflags)
 				}
 				else
 				{
-					std::printf("unsupported udp tracker action: %d\n", action);
+					std::printf("unsupported udp tracker action: %u\n", action);
 				}
 				return ret;
 			});

simulation/test_swarm.cpp

@@ -951,7 +951,7 @@ TORRENT_TEST(pex)
 						lt::duration_cast<lt::milliseconds>(d).count());
 
 					if (i == 0) {
-					std::printf("%4d.%03d: %-25s %s\n"
+					std::printf("%4u.%03u: %-25s %s\n"
 						, millis / 1000, millis % 1000
 						, a->what()
 						, a->message().c_str());

simulation/test_tracker.cpp

@@ -354,7 +354,7 @@ void on_alert_notify(lt::session* ses)
 			lt::time_duration d = a->timestamp().time_since_epoch();
 			std::uint32_t const millis = std::uint32_t(
 				lt::duration_cast<lt::milliseconds>(d).count());
-			std::printf("%4d.%03d: %s\n", millis / 1000, millis % 1000,
+			std::printf("%4u.%03u: %s\n", millis / 1000, millis % 1000,
 				a->message().c_str());
 		}
 	});
@@ -514,7 +514,7 @@ void test_udpv6_support(char const* listen_interfaces
 					lt::time_duration d = a->timestamp().time_since_epoch();
 					std::uint32_t const millis = std::uint32_t(
 						lt::duration_cast<lt::milliseconds>(d).count());
-					std::printf("%4d.%03d: %s\n", millis / 1000, millis % 1000,
+					std::printf("%4u.%03u: %s\n", millis / 1000, millis % 1000,
 						a->message().c_str());
 					if (auto tr = alert_cast<tracker_announce_alert>(a))
 					{

test/print_alerts.cpp

@@ -63,7 +63,7 @@ void print_alerts(lt::session* ses, lt::time_point start_time)
 #endif
 		lt::time_duration d = a->timestamp() - start_time;
 		std::uint32_t millis = std::uint32_t(lt::duration_cast<lt::milliseconds>(d).count());
-		std::printf("%4d.%03d: %-25s %s\n", millis / 1000, millis % 1000
+		std::printf("%4u.%03u: %-25s %s\n", millis / 1000, millis % 1000
 			, a->what()
 			, a->message().c_str());
 	}

test/udp_tracker.cpp

@@ -160,7 +160,7 @@ struct udp_tracker
 				std::printf("%s: UDP scrape (ignored)\n", time_now_string().c_str());
 				break;
 			default:
-				std::printf("%s: UDP unknown message: %d\n", time_now_string().c_str()
+				std::printf("%s: UDP unknown message: %u\n", time_now_string().c_str()
 					, action);
 				break;
 		}