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slcanpty: print_usage(): factor out help text into separate function 

...and use single fprintf() call only.
pull/499/head
Marc Kleine-Budde 2024-02-19 08:46:31 +01:00
parent 7683efab41
commit e4ba924b21
1 changed files with 19 additions and 13 deletions
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32
slcanpty.c
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@ -387,6 +387,24 @@ int check_select_stdin(void)
return 1; return 1;
} }
static void print_usage(const char *prg)
{
fprintf(stderr,
"%s: adapter for applications using the slcan ASCII protocol.\n"
"\n"
"%s creates a pty for applications using the slcan ASCII protocol and\n"
"converts the ASCII data to a CAN network interface (and vice versa)\n"
"\n"
"Usage: %s <pty> <can interface>\n"
"\n"
"Examples:\n"
"%s /dev/ptyc0 can0 - creates /dev/ttyc0 for the slcan application\n"
"\n"
"e.g. for pseudo-terminal '%s %s can0' creates /dev/pts/N\n"
"\n",
prg, prg, prg, prg, prg, DEVICE_NAME_PTMX);
}
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
fd_set rdfs; fd_set rdfs;
@ -402,19 +420,7 @@ int main(int argc, char **argv)
/* check command line options */ /* check command line options */
if (argc != 3) { if (argc != 3) {
fprintf(stderr, "%s: adapter for applications using" print_usage(basename(argv[0]));
" the slcan ASCII protocol.\n", basename(argv[0]));
fprintf(stderr, "\n%s creates a pty for applications using"
" the slcan ASCII protocol and\n", basename(argv[0]));
fprintf(stderr, "converts the ASCII data to a CAN network"
" interface (and vice versa)\n\n");
fprintf(stderr, "Usage: %s <pty> <can interface>\n", basename(argv[0]));
fprintf(stderr, "\nExamples:\n");
fprintf(stderr, "%s /dev/ptyc0 can0 - creates /dev/ttyc0 for the slcan application\n\n",
basename(argv[0]));
fprintf(stderr, "e.g. for pseudo-terminal '%s %s can0' creates"
" /dev/pts/N\n", basename(argv[0]), DEVICE_NAME_PTMX);
fprintf(stderr, "\n");
return 1; return 1;
} }