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argument handling

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This commit is contained in:
Igor Socec 2014-03-06 16:09:19 +01:00
parent 4df19b472b
commit b1b990d861
1 changed files with 12 additions and 9 deletions
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21
moxerver.c
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@ -3,12 +3,14 @@
#define SERVER_WAIT_TIMEOUT 5 /* seconds for select() timeout in server loop */
#define PORT_MIN 4001 /* minimum TCP port number */
#define PORT_MAX 4008 /* maximum TCP port number */
/* Prints help message. */
void usage() {
//TODO maybe some styling should be done
fprintf(stderr, "Usage: moxerver -p tcp_port -t tty_path [-h]\n");
fprintf(stderr, "- tcp_port must be in range 4001 to 4008\n\n");
fprintf(stderr, "- tcp_port range [%d .. %d]\n\n", PORT_MIN, PORT_MAX);
}
/* MoxaNix main program loop. */
@ -28,22 +30,17 @@ int main(int argc, char *argv[]) {
struct timeval tv;
/* grab arguments */
/* check argument count */
if (argc <= 1) {
fprintf(stderr, "error parsing arguments\n");
usage();
return 0;
}
/* grab arguments */
while ((ret = getopt(argc, argv, ":p:t:h")) != -1) {
switch (ret) {
/* get server port number */
case 'p':
tcp_port = (unsigned int) atoi(optarg);
/* check port range */
if (tcp_port < 4001 || tcp_port > 4008) {
fprintf(stderr, "error: port number out of 4001-4008 range\n");
return -1;
}
break;
/* get tty device path */
case 't':
@ -59,8 +56,14 @@ int main(int argc, char *argv[]) {
return 0;
}
}
/* check arguments */
if (tcp_port < PORT_MIN || tcp_port > PORT_MAX) {
fprintf(stderr, "error: port number out of %d-%d range\n\n", PORT_MIN, PORT_MAX);
usage();
return -1;
}
if (strlen(tty_path) == 0) {
fprintf(stderr, "error parsing arguments\n");
fprintf(stderr, "error: tty path was not specified\n\n");
usage();
return 0;
}