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isotptun: print command line parsing error messages to stderr

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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>
This commit is contained in:
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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isotptun.c
+4 -4
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@@ -154,7 +154,7 @@ int main(int argc, char **argv)
else if (elements == 2)
opts.flags |= (CAN_ISOTP_EXTEND_ADDR | CAN_ISOTP_RX_EXT_ADDR);
else {
printf("incorrect extended addr values '%s'.\n", optarg);
fprintf(stderr, "incorrect extended addr values '%s'.\n", optarg);
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
@@ -174,7 +174,7 @@ int main(int argc, char **argv)
else if (sscanf(optarg, ":%hhx", &opts.rxpad_content) == 1)
opts.flags |= CAN_ISOTP_RX_PADDING;
else {
printf("incorrect padding values '%s'.\n", optarg);
fprintf(stderr, "incorrect padding values '%s'.\n", optarg);
print_usage(basename(argv[0]));
exit(EXIT_FAILURE);
}
@@ -189,7 +189,7 @@ int main(int argc, char **argv)
else if (optarg[0] == 'a')
opts.flags |= (CAN_ISOTP_CHK_PAD_LEN | CAN_ISOTP_CHK_PAD_DATA);
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]));
exit(EXIT_FAILURE);
}
@@ -220,7 +220,7 @@ int main(int argc, char **argv)
&llopts.mtu,
&llopts.tx_dl,
&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]));
exit(EXIT_FAILURE);
}