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isotptun: print command line parsing error messages to stderr 

Command line parsing error messages are printed to stdout. Other errors
and usage goes to stderr.

Change to print errors to stderr.

Signed-off-by: Marko Kohtala <marko.kohtala@gmail.com>
pull/37/head
Marko Kohtala 2017-02-14 11:14:29 +02:00
parent 7eb005d9f3
commit 51192feff8
1 changed files with 4 additions and 4 deletions
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8
isotptun.c
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@ -154,7 +154,7 @@ int main(int argc, char **argv)
else if (elements == 2) else if (elements == 2)
opts.flags |= (CAN_ISOTP_EXTEND_ADDR | CAN_ISOTP_RX_EXT_ADDR); opts.flags |= (CAN_ISOTP_EXTEND_ADDR | CAN_ISOTP_RX_EXT_ADDR);
else { else {
printf("incorrect extended addr values '%s'.\n", optarg); fprintf(stderr, "incorrect extended addr values '%s'.\n", optarg);
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
@ -174,7 +174,7 @@ int main(int argc, char **argv)
else if (sscanf(optarg, ":%hhx", &opts.rxpad_content) == 1) else if (sscanf(optarg, ":%hhx", &opts.rxpad_content) == 1)
opts.flags |= CAN_ISOTP_RX_PADDING; opts.flags |= CAN_ISOTP_RX_PADDING;
else { else {
printf("incorrect padding values '%s'.\n", optarg); fprintf(stderr, "incorrect padding values '%s'.\n", optarg);
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
@ -189,7 +189,7 @@ int main(int argc, char **argv)
else if (optarg[0] == 'a') else if (optarg[0] == 'a')
opts.flags |= (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA); opts.flags |= (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA);
else { else {
printf("unknown padding check option '%c'.\n", optarg[0]); fprintf(stderr, "unknown padding check option '%c'.\n", optarg[0]);
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
@ -220,7 +220,7 @@ int main(int argc, char **argv)
&llopts.mtu, &llopts.mtu,
&llopts.tx_dl, &llopts.tx_dl,
&llopts.tx_flags) != 3) { &llopts.tx_flags) != 3) {
printf("unknown link layer options '%s'.\n", optarg); fprintf(stderr, "unknown link layer options '%s'.\n", optarg);
print_usage(basename(argv[0])); print_usage(basename(argv[0]));
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }