diff --git a/asc2log.c b/asc2log.c
index 40a1c13..2da2e38 100644
--- a/asc2log.c
+++ b/asc2log.c
@@ -192,7 +192,7 @@ static void eval_can(char* buf, struct timeval *date_tvp, char timestamps,
 	struct canfd_frame cf = { 0 };
 	struct can_frame *ccf = (struct can_frame *)&cf; /* for len8_dlc */
 	char rtr;
-	int dlc = 0;
+	unsigned int dlc = 0;
 	int len = 0;
 	int data[8];
 	char idstr[21];
@@ -300,7 +300,7 @@ static void eval_canfd(char* buf, struct timeval *date_tvp, char timestamps,
 	struct canfd_frame cf = { 0 };
 	unsigned char brs, esi;
 	unsigned int flags;
-	int dlc, dlen = 0;
+	unsigned int dlc, dlen = 0;
 	char idstr[21];
 	char dir[5]; /* 'Rx'/'Tx'/'TxRq' plus terminating zero */
 	char *ptr;
@@ -319,12 +319,12 @@ static void eval_canfd(char* buf, struct timeval *date_tvp, char timestamps,
 	 */
 
 	/* check for valid line without symbolic name */
-	if (sscanf(buf, "%llu.%llu %*s %d %4s %20s %hhx %hhx %x %d %n",
+	if (sscanf(buf, "%llu.%llu %*s %d %4s %20s %hhx %hhx %x %u %n",
 		   &sec, &usec, &interface,
 		   dir, idstr, &brs, &esi, &dlc, &dlen, &n) != 9) {
 
 		/* check for valid line with a symbolic name */
-		if (sscanf(buf, "%llu.%llu %*s %d %4s %20s %*s %hhx %hhx %x %d %n",
+		if (sscanf(buf, "%llu.%llu %*s %d %4s %20s %*s %hhx %hhx %x %u %n",
 			   &sec, &usec, &interface,
 			   dir, idstr, &brs, &esi, &dlc, &dlen, &n) != 9) {
 
@@ -412,7 +412,7 @@ static void eval_canxl_cc(char* buf, struct timeval *date_tvp, char timestamps,
 	static struct timeval read_tv; /* frame timestamp from ASC file */
 	struct can_frame cf = { 0 };
 	unsigned int flags;
-	int dlc, dlen = 0;
+	unsigned int dlc, dlen = 0;
 	char idstr[21];
 	char dir[5]; /* 'Rx'/'Tx'/'TxRq' plus terminating zero */
 	char *ptr;
@@ -430,7 +430,7 @@ static void eval_canxl_cc(char* buf, struct timeval *date_tvp, char timestamps,
 	if (sscanf(buf,
 		   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 		   "%*s %*s %*s %20s " /* frame format, msg dur, bit count, ID */
-		   "%x %d %n", /* DLC, Datalen */
+		   "%x %u %n", /* DLC, Datalen */
 		   &sec, &usec, &interface, dir,
 		   idstr,
 		   &dlc, &dlen, &n) != 7) {
@@ -438,7 +438,7 @@ static void eval_canxl_cc(char* buf, struct timeval *date_tvp, char timestamps,
 		if (sscanf(buf,
 			   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 			   "%*s %*s %*s %20s " /* frame format, msg dur, bit count, ID */
-			   "%*s %x %d %n", /* sym name, DLC, Datalen */
+			   "%*s %x %u %n", /* sym name, DLC, Datalen */
 			   &sec, &usec, &interface, dir,
 			   idstr,
 			   &dlc, &dlen, &n) != 7) {
@@ -509,7 +509,7 @@ static void eval_canxl_fd(char* buf, struct timeval *date_tvp, char timestamps,
 	static struct timeval read_tv; /* frame timestamp from ASC file */
 	struct canfd_frame cf = { 0 };
 	unsigned int flags;
-	int dlc, dlen = 0;
+	unsigned int dlc, dlen = 0;
 	char idstr[21];
 	char dir[5]; /* 'Rx'/'Tx'/'TxRq' plus terminating zero */
 	char *ptr;
@@ -527,7 +527,7 @@ static void eval_canxl_fd(char* buf, struct timeval *date_tvp, char timestamps,
 	if (sscanf(buf,
 		   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 		   "%*s %*s %*s %20s " /* frame format, msg dur, bit count, ID */
-		   "%x %d %n", /* DLC, Datalen */
+		   "%x %u %n", /* DLC, Datalen */
 		   &sec, &usec, &interface, dir,
 		   idstr,
 		   &dlc, &dlen, &n) != 7) {
@@ -535,7 +535,7 @@ static void eval_canxl_fd(char* buf, struct timeval *date_tvp, char timestamps,
 		if (sscanf(buf,
 			   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 			   "%*s %*s %*s %20s " /* frame format, msg dur, bit count, ID */
-			   "%*s %x %d %n", /* sym name, DLC, Datalen */
+			   "%*s %x %u %n", /* sym name, DLC, Datalen */
 			   &sec, &usec, &interface, dir,
 			   idstr,
 			   &dlc, &dlen, &n) != 7) {
@@ -603,7 +603,7 @@ static void eval_canxl_xl(char* buf, struct timeval *date_tvp, char timestamps,
 	struct canxl_frame cf = { 0 };
 	unsigned char sdt, vcid, secbit;
 	unsigned int af, flags;
-	int dlc, dlen = 0;
+	unsigned int dlc, dlen = 0;
 	char idstr[21];
 	char dir[5]; /* 'Rx'/'Tx'/'TxRq' plus terminating zero */
 	char *ptr;
@@ -622,7 +622,7 @@ static void eval_canxl_xl(char* buf, struct timeval *date_tvp, char timestamps,
 	if (sscanf(buf,
 		   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 		   "%*s %*s %*s %20s " /* frame format, msg dur, bit count, ID */
-		   "%hhx %hhx %x %d " /* SDT, SEC, DLC, Datalen */
+		   "%hhx %hhx %x %u " /* SDT, SEC, DLC, Datalen */
 		   "%*s %*s %hhx %x %n", /* stuff bit count, crc, VCID, AF */
 		   &sec, &usec, &interface, dir,
 		   idstr,
@@ -632,7 +632,7 @@ static void eval_canxl_xl(char* buf, struct timeval *date_tvp, char timestamps,
 		if (sscanf(buf,
 			   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 			   "%*s %*s %*s %20s " /* frame format, msg dur, bit count, ID */
-			   "%*s %hhx %hhx %x %d " /* sym name, SDT, SEC, DLC, Datalen */
+			   "%*s %hhx %hhx %x %u " /* sym name, SDT, SEC, DLC, Datalen */
 			   "%*s %*s %hhx %x %n", /* stuff bit count, crc, VCID, AF */
 			   &sec, &usec, &interface, dir,
 			   idstr,