Print usage when no argument

The program needs a argument to specific which port it works on.

1 files changed, 9 insertions, 0 deletions

diff --git a/server.c b/server.c
index dbdaa67..fdc8724 100644
--- a/server.c
+++ b/server.c
@@ -13,6 +13,12 @@
 
 typedef enum { GET = 0, POST = 1, UNKNOWN = -1 } HTTP_METHODS;
 
+static void usage(const char *progname)
+{
+	fprintf(stderr, "Usage: %s <port>\n", progname);
+	exit(EXIT_FAILURE);
+}
+
 int shsd_sendfile(int in_fd, FILE *ou_fd)
 {
 	struct stat s;
@@ -81,6 +87,9 @@ int handle_client(int client_fd, char *buf)
 
 int main(int argc, char **argv)
 {
+	if (argc < 2) {
+		usage(argv[0]);
+	}
 	struct addrinfo hints, *res;
 	struct sockaddr_storage their_addr;
 	socklen_t addr_size;