diff --git a/asc2log.c b/asc2log.c
index 060c4d3..fe69598 100644
--- a/asc2log.c
+++ b/asc2log.c
@@ -265,6 +265,7 @@ static void eval_canfd(char* buf, struct timeval *date_tvp, char timestamps,
 	char *extra_info;
 	char *ptr;
 	int i;
+	int n = 0; /* sscanf consumed characters */
 	unsigned long long sec, usec;
 
 	/*
@@ -279,14 +280,14 @@ 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 %s %hhx %hhx %x %d ",
+	if (sscanf(buf, "%llu.%llu %*s %d %4s %s %hhx %hhx %x %d %n",
 		   &sec, &usec, &interface,
-		   dir, tmp1, &brs, &esi, &dlc, &dlen) != 9) {
+		   dir, tmp1, &brs, &esi, &dlc, &dlen, &n) != 9) {
 
 		/* check for valid line with a symbolic name */
-		if (sscanf(buf, "%llu.%llu %*s %d %4s %s %*s %hhx %hhx %x %d ",
+		if (sscanf(buf, "%llu.%llu %*s %d %4s %s %*s %hhx %hhx %x %d %n",
 			   &sec, &usec, &interface,
-			   dir, tmp1, &brs, &esi, &dlc, &dlen) != 9) {
+			   dir, tmp1, &brs, &esi, &dlc, &dlen, &n) != 9) {
 
 			/* no valid CANFD format pattern */
 			return;
@@ -322,15 +323,7 @@ static void eval_canfd(char* buf, struct timeval *date_tvp, char timestamps,
 
 	get_can_id(&cf.can_id, tmp1, 16);
 
-	/* now search for the beginning of the data[] content */
-	sprintf(tmp1, " %x %x %x %2d ", brs, esi, dlc, dlen);
-
-	/* search for the pattern generated by real data */
-	ptr = strcasestr(buf, tmp1);
-	if (ptr == NULL)
-		return;
-
-	ptr += strlen(tmp1); /* start of ASCII hex frame data */
+	ptr = buf + n; /* start of ASCII hex frame data */
 
 	cf.len = dlen;
 
@@ -402,13 +395,14 @@ static void eval_canxl_xl(char* buf, struct timeval *date_tvp, char timestamps,
 	static struct timeval read_tv; /* frame timestamp from ASC file */
 	struct canxl_frame cf = { 0 };
 	unsigned char sdt, vcid, secbit, ctmp;
-	unsigned int af, sbc, pcrc, flags;
+	unsigned int af, flags;
 	int dlc, dlen = 0;
 	char tmp1[BUFLEN];
 	char dir[5]; /* 'Rx'/'Tx'/'TxRq' plus terminating zero */
 	char *extra_info;
 	char *ptr;
 	int i;
+	int n = 0; /* sscanf consumed characters */
 	unsigned long long sec, usec;
 
 	/*
@@ -424,21 +418,21 @@ static void eval_canxl_xl(char* buf, struct timeval *date_tvp, char timestamps,
 		   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 		   "%*s %*s %*s %s " /* frame format, msg dur, bit count, ID */
 		   "%hhx %hhx %x %d " /* SDT, SEC, DLC, Datalen */
-		   "%x %x %hhx %x ", /* stuff bit count, crc, VCID, AF */
+		   "%*s %*s %hhx %x %n", /* stuff bit count, crc, VCID, AF */
 		   &sec, &usec, &interface, dir,
 		   tmp1,
 		   &sdt, &secbit, &dlc, &dlen,
-		   &sbc, &pcrc, &vcid, &af) != 13) {
+		   &vcid, &af, &n) != 11) {
 		/* check for valid line with a symbolic name */
 		if (sscanf(buf,
 			   "%llu.%llu %*s %d %4s " /* time, CANXL, channel, direction */
 			   "%*s %*s %*s %s " /* frame format, msg dur, bit count, ID */
 			   "%*s %hhx %hhx %x %d " /* sym name, SDT, SEC, DLC, Datalen */
-			   "%x %x %hhx %x ", /* stuff bit count, crc, VCID, AF */
+			   "%*s %*s %hhx %x %n", /* stuff bit count, crc, VCID, AF */
 			   &sec, &usec, &interface, dir,
 			   tmp1,
 			   &sdt, &secbit, &dlc, &dlen,
-			   &sbc, &pcrc, &vcid, &af) != 13) {
+			   &vcid, &af, &n) != 11) {
 
 			/* no valid CANXL format pattern */
 			return;
@@ -449,8 +443,7 @@ static void eval_canxl_xl(char* buf, struct timeval *date_tvp, char timestamps,
 	read_tv.tv_usec = usec;
 
 	/* check for allowed (unsigned) value ranges */
-	if ((dlen > CANXL_MAX_DLEN) || (dlc > CANXL_MAX_DLC) ||
-	    (sbc > 7) || (secbit > 1))
+	if ((dlen > CANXL_MAX_DLEN) || (dlc > CANXL_MAX_DLC) || (secbit > 1))
 		return;
 
 	cf.sdt = sdt;
@@ -484,15 +477,7 @@ static void eval_canxl_xl(char* buf, struct timeval *date_tvp, char timestamps,
 	if (vcid)
 		cf.prio |= (vcid << CANXL_VCID_OFFSET);
 
-	/* now search for the beginning of the data[] content */
-	sprintf(tmp1, " %x %04x %02x %08x ", sbc, pcrc, vcid, af);
-
-	/* search for the pattern generated by real data */
-	ptr = strcasestr(buf, tmp1);
-	if (ptr == NULL)
-		return;
-
-	ptr += strlen(tmp1); /* start of ASCII hex frame data */
+	ptr = buf + n; /* start of ASCII hex frame data */
 
 	cf.len = dlen;