diff options
Diffstat (limited to 'src/cansequence.c')
| -rw-r--r-- | src/cansequence.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/cansequence.c b/src/cansequence.c index 8395c65..30b5cd6 100644 --- a/src/cansequence.c +++ b/src/cansequence.c @@ -42,8 +42,8 @@ void print_usage(char *prg) " -t, --type=TYPE Socket type, see man 2 socket (default SOCK_RAW = %d)\n" " -p, --protocol=PROTO CAN protocol (default CAN_RAW = %d)\n" " -r, --receive work as receiver\n" - " -l COUNT send COUNT messages, infinite if omitted\n" - " --loop=COUNT \n" + " -l send message infinite times\n" + " --loop=COUNT send message COUNT times\n" " -q --quit quit if a wrong sequence is encountered\n" " -v, --verbose be verbose (twice to be even more verbose\n" " -h --help this help\n" @@ -82,12 +82,12 @@ int main(int argc, char **argv) { "version", no_argument, 0, VERSION_OPTION}, { "receive", no_argument, 0, 'r'}, { "quit", no_argument, 0, 'q'}, - { "loop", optional_argument, 0, 'l'}, + { "loop", required_argument, 0, 'l'}, { "verbose", no_argument, 0, 'v'}, { 0, 0, 0, 0}, }; - while ((opt = getopt_long(argc, argv, "f:t:p:vrl::hq", long_options, NULL)) != -1) { + while ((opt = getopt_long(argc, argv, "f:t:p:vrlhq", long_options, NULL)) != -1) { switch (opt) { case 'h': print_usage(basename(argv[0])); @@ -134,8 +134,16 @@ int main(int argc, char **argv) } } - if (optind != argc) - interface = argv[optind]; + if (optind == argc) { + print_usage(basename(argv[0])); + exit(0); + } + + if (argv[optind] == NULL) { + fprintf(stderr, "No Interface supplied\n"); + exit(-1); + } + interface = argv[optind]; printf("interface = %s, family = %d, type = %d, proto = %d\n", interface, family, type, proto); |