X-Git-Url: http://rtime.felk.cvut.cz/gitweb/socketcan-devel.git/blobdiff_plain/5d98b9d3cc77c81e2b36c481d39d459ef40f7790..369f9e23b0a2e24260f23504ab9d40a520e98587:/can-utils/cangw.c

diff --git a/can-utils/cangw.c b/can-utils/cangw.c
index ee063e9..d6e9668 100644
--- a/can-utils/cangw.c
+++ b/can-utils/cangw.c
@@ -203,7 +203,9 @@ void print_usage(char *prg)
 	fprintf(stderr, "           -p <profile>:[<profile_data>] (CRC8 checksum profile & parameters)\n");
 	fprintf(stderr, "\nValues are given and expected in hexadecimal values. Leading 0s can be omitted.\n");
 	fprintf(stderr, "\n");
-	fprintf(stderr, "<filter> is a <value>:<mask> CAN identifier filter\n");
+	fprintf(stderr, "<filter> is a <value><mask> CAN identifier filter\n");
+	fprintf(stderr, "   <can_id>:<can_mask> (matches when <received_can_id> & mask == can_id & mask)\n");
+	fprintf(stderr, "   <can_id>~<can_mask> (matches when <received_can_id> & mask != can_id & mask)\n");
 	fprintf(stderr, "\n");
 	fprintf(stderr, "<mod> is a CAN frame modification instruction consisting of\n");
 	fprintf(stderr, "<instruction>:<can_frame-elements>:<can_id>.<can_dlc>.<can_data>\n");
@@ -595,6 +597,11 @@ int main(int argc, char **argv)
 				   (long unsigned int *)&filter.can_id, 
 				   (long unsigned int *)&filter.can_mask) == 2) {
 				have_filter = 1;
+			} else if (sscanf(optarg, "%lx~%lx",
+					  (long unsigned int *)&filter.can_id, 
+					  (long unsigned int *)&filter.can_mask) == 2) {
+				filter.can_id |= CAN_INV_FILTER;
+				have_filter = 1;
 			} else {
 				printf("Bad filter definition '%s'.\n", optarg);
 				exit(1);