diff --git a/canerrsim.c b/canerrsim.c
index 280acf6..8c6caf3 100644
--- a/canerrsim.c
+++ b/canerrsim.c
@@ -134,21 +134,14 @@ void __attribute__((format (printf, 1, 2))) err_exit(const char *format, ...)
 	exit(EXIT_FAILURE);
 }
 
-void show_custom_format_and_exit(const char *param, const char *format)
-{
-	char str_buf[80];
-	sprintf(str_buf, format, param);
-	err_exit("%s", str_buf);
-}
-
 void show_invalid_option(const char *option)
 {
-	show_custom_format_and_exit(option, "Error: Invalid option %s\n");
+	err_exit("Error: Invalid option %s\n", option);
 }
 
 void show_err_and_exit(const char *err_type)
 {
-	show_custom_format_and_exit(err_type, "Error: You can only have one %s parameter!\n");
+	err_exit("Error: You can only have one %s parameter!\n", err_type);
 }
 
 void show_loc_err_and_exit()
@@ -182,7 +175,6 @@ int main(int argc, char *argv[])
 	struct ifreq ifr;
 	struct can_frame frame;
 	bool show_bits = false, location_processed = false, transceiver_processed = false, arbitration_processed = false;
-	char tmp_str[256];
 
 	printf("CAN Sockets Error Messages Simulator\n");
 	if (argc < 3)
@@ -547,10 +539,8 @@ int main(int argc, char *argv[])
 
 	// set interface name
 	strcpy(ifr.ifr_name, argv[1]); // can0, vcan0...
-	if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
-		sprintf(tmp_str, "Error setting CAN interface name %s", argv[1]);
-		err_exit(tmp_str);
-	}
+	if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0)
+		err_exit("Error setting CAN interface name %s\n", argv[1]);
 
 	// bind socket to the CAN interface
 	addr.can_family = AF_CAN;