Finish up yes(1) by adding multiple string support

yes.c

@@ -7,18 +7,22 @@
 static void
 usage(void)
 {
-	eprintf("usage: %s [string]\n", argv0);
+	eprintf("usage: %s [string ...]\n", argv0);
 }
 
 int
 main(int argc, char *argv[])
 {
+	size_t i;
+
 	ARGBEGIN {
 	default:
 		usage();
 	} ARGEND;
 
-	for (;;)
-		puts(argc >= 1 ? argv[0] : "y");
+	for (i = 0; ;i++, i %= argc) {
+		printf("%s", (argc > 0) ? argv[i] : "y");
+		putchar((i == argc - 1) ? '\n' : ' ');
+	}
 	return 1; /* should not reach */
 }