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candump: add global variable progname 

Instead of using argv[0] several time, make the progname a global
variable.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20221114163848.3398-6-mailhol.vincent@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
pull/387/head
Vincent Mailhol 2022-11-15 01:38:47 +09:00 committed by Marc Kleine-Budde
parent 0cfd56d613
commit 8e45fc5158
1 changed files with 20 additions and 17 deletions
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37
candump.c
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@ -108,6 +108,7 @@ struct if_info { /* bundled information per open socket */
};
static struct if_info sock_info[MAXSOCK];
static char *progname;
static char devname[MAXIFNAMES][IFNAMSIZ+1];
static int dindex[MAXIFNAMES];
static int max_devname_len; /* to prevent frazzled device name output */
@ -121,11 +122,11 @@ extern int optind, opterr, optopt;
static volatile int running = 1;
static void print_usage(char *prg)
static void print_usage(void)
{
fprintf(stderr, "%s - dump CAN bus traffic.\n", prg);
fprintf(stderr, "\nUsage: %s [options] <CAN interface>+\n", prg);
fprintf(stderr, " (use CTRL-C to terminate %s)\n\n", prg);
fprintf(stderr, "%s - dump CAN bus traffic.\n", progname);
fprintf(stderr, "\nUsage: %s [options] <CAN interface>+\n", progname);
fprintf(stderr, " (use CTRL-C to terminate %s)\n\n", progname);
fprintf(stderr, "Options:\n");
fprintf(stderr, " -t <type> (timestamp: (a)bsolute/(d)elta/(z)ero/(A)bsolute w date)\n");
fprintf(stderr, " -H (read hardware timestamps instead of system timestamps)\n");
@ -159,12 +160,12 @@ static void print_usage(char *prg)
fprintf(stderr, "Without any given filter all data frames are received ('0:0' default filter).\n");
fprintf(stderr, "\nUse interface name '%s' to receive from all CAN interfaces.\n", ANYDEV);
fprintf(stderr, "\nExamples:\n");
fprintf(stderr, "%s -c -c -ta can0,123:7FF,400:700,#000000FF can2,400~7F0 can3 can8\n\n", prg);
fprintf(stderr, "%s -l any,0~0,#FFFFFFFF\n (log only error frames but no(!) data frames)\n", prg);
fprintf(stderr, "%s -l any,0:0,#FFFFFFFF\n (log error frames and also all data frames)\n", prg);
fprintf(stderr, "%s vcan2,12345678:DFFFFFFF\n (match only for extended CAN ID 12345678)\n", prg);
fprintf(stderr, "%s vcan2,123:7FF\n (matches CAN ID 123 - including EFF and RTR frames)\n", prg);
fprintf(stderr, "%s vcan2,123:C00007FF\n (matches CAN ID 123 - only SFF and non-RTR frames)\n", prg);
fprintf(stderr, "%s -c -c -ta can0,123:7FF,400:700,#000000FF can2,400~7F0 can3 can8\n\n", progname);
fprintf(stderr, "%s -l any,0~0,#FFFFFFFF\n (log only error frames but no(!) data frames)\n", progname);
fprintf(stderr, "%s -l any,0:0,#FFFFFFFF\n (log error frames and also all data frames)\n", progname);
fprintf(stderr, "%s vcan2,12345678:DFFFFFFF\n (match only for extended CAN ID 12345678)\n", progname);
fprintf(stderr, "%s vcan2,123:7FF\n (matches CAN ID 123 - including EFF and RTR frames)\n", progname);
fprintf(stderr, "%s vcan2,123:C00007FF\n (matches CAN ID 123 - only SFF and non-RTR frames)\n", progname);
fprintf(stderr, "\n");
}
@ -325,6 +326,8 @@ int main(int argc, char **argv)
last_tv.tv_sec = 0;
last_tv.tv_usec = 0;
progname = basename(argv[0]);
while ((opt = getopt(argc, argv, "t:HciaSs:lDdxLf:n:r:he8T:?")) != -1) {
switch (opt) {
case 't':
@ -333,7 +336,7 @@ int main(int argc, char **argv)
if ((timestamp != 'a') && (timestamp != 'A') &&
(timestamp != 'd') && (timestamp != 'z')) {
fprintf(stderr, "%s: unknown timestamp mode '%c' - ignored\n",
basename(argv[0]), optarg[0]);
progname, optarg[0]);
timestamp = 0;
}
if ((logtimestamp != 'a') && (logtimestamp != 'z')) {
@ -372,7 +375,7 @@ int main(int argc, char **argv)
case 's':
silent = atoi(optarg);
if (silent > SILENT_ON) {
print_usage(basename(argv[0]));
print_usage();
exit(1);
}
break;
@ -405,7 +408,7 @@ int main(int argc, char **argv)
case 'n':
count = atoi(optarg);
if (count < 1) {
print_usage(basename(argv[0]));
print_usage();
exit(1);
}
break;
@ -413,7 +416,7 @@ int main(int argc, char **argv)
case 'r':
rcvbuf_size = atoi(optarg);
if (rcvbuf_size < 1) {
print_usage(basename(argv[0]));
print_usage();
exit(1);
}
break;
@ -422,19 +425,19 @@ int main(int argc, char **argv)
errno = 0;
timeout_ms = strtol(optarg, NULL, 0);
if (errno != 0) {
print_usage(basename(argv[0]));
print_usage();
exit(1);
}
break;
default:
print_usage(basename(argv[0]));
print_usage();
exit(1);
break;
}
}
if (optind == argc) {
print_usage(basename(argv[0]));
print_usage();
exit(0);
}