Make host parameters optional

For me at least, the first valid configuration found by getaddrinfo
works fine most of the time. Obviously if this isn't the configuration
you want, you can specify the host explicitly.

main.c

@@ -166,7 +166,7 @@ usage(void)
 	const char *opts = "[-u user] [-g group] [-n num] [-d dir] [-l] "
 	                   "[-i file] [-v vhost] ... [-m map] ...";
 
-	die("usage: %s -h host -p port %s\n"
+	die("usage: %s -p port [-h host] %s\n"
 	    "       %s -U file [-p port] %s", argv0,
 	    opts, argv0, opts);
 }
@@ -266,8 +266,8 @@ main(int argc, char *argv[])
 		usage();
 	}
 
-	/* allow host xor UNIX-domain socket, force port with host */
-	if ((!s.host == !udsname) || (s.host && !s.port)) {
+	/* can't have both host and UDS but must have one of port or UDS*/
+	if ((s.host && udsname) || !(s.port || udsname)) {
 		usage();
 	}
 

quark.1

@@ -6,8 +6,8 @@
 .Nd simple static web server
 .Sh SYNOPSIS
 .Nm
-.Fl h Ar host
 .Fl p Ar port
+.Op Fl h Ar host
 .Op Fl u Ar user
 .Op Fl g Ar group
 .Op Fl n Ar num