--- /5.0/usr/src/games/grdc/grdc.c	Tue Sep 25 14:45:46 2001
+++ grdc.c	Tue Feb 19 09:21:04 2002
@@ -1,10 +1,13 @@
 /*
  * Grand digital clock for curses compatible terminals
  * Usage: grdc [-s] [n]   -- run for n seconds (default infinity)
+ *        grdc -t n       -- countdown n seconds
  * Flags: -s: scroll
+ *        -t: timer mode
  *
  * modified 10-18-89 for curses (jrl)
  * 10-18-89 added signal handling
+ * 02-18-02 added countdown timer mode
  *
  * $FreeBSD: src/games/grdc/grdc.c,v 1.9 2001/09/25 13:45:46 ru Exp $
  */
@@ -25,6 +28,7 @@
 
 /* it won't be */
 time_t now; /* yeah! */
+time_t end; /* for timer mode */
 struct tm *tm;
 
 short disp[11] = {
@@ -58,15 +62,18 @@
 int i, j, s, k;
 int n;
 int ch;
-int scrol;
+int scrol = 0;
+int timer = 0;
+int hour, minute, second;
 
-	scrol = 0;
-
-	while ((ch = getopt(argc, argv, "s")) != -1)
+	while ((ch = getopt(argc, argv, "st")) != -1)
 	switch (ch) {
 	case 's':
 		scrol = 1;
 		break;
+	case 't':
+		timer = 1;
+		break;
 	case '?':
 	default:
 		usage();
@@ -75,7 +82,7 @@
 	argc -= optind;
 	argv += optind;
 
-	if (argc > 1) {
+	if ((argc > 1) || (argc == 0 && timer)) {
 		usage();
 		/* NOTREACHED */
 	}
@@ -85,6 +92,9 @@
 	else
 		n = 0;
 
+	if (timer && n == 0)
+		return(0);
+
 	initscr();
 
 	signal(SIGINT,sighndl);
@@ -127,16 +137,30 @@
 
 		attrset(COLOR_PAIR(2));
 	}
+	time(&end);
+	end += n;
 	do {
 		mask = 0;
 		time(&now);
-		tm = localtime(&now);
-		set(tm->tm_sec%10, 0);
-		set(tm->tm_sec/10, 4);
-		set(tm->tm_min%10, 10);
-		set(tm->tm_min/10, 14);
-		set(tm->tm_hour%10, 20);
-		set(tm->tm_hour/10, 24);
+		if (!timer) {
+			tm = localtime(&now);
+			hour = tm->tm_hour;
+			minute = tm->tm_min;
+			second = tm->tm_sec;
+		} else {
+			n = end - now;
+			if (n <= 0)
+				break;
+			hour = (n/3600)%100;
+			minute = (n/60)%60;
+			second = n%60;
+		}
+		set(second%10, 0);
+		set(second/10, 4);
+		set(minute%10, 10);
+		set(minute/10, 14);
+		set(hour%10, 20);
+		set(hour/10, 24);
 		set(10, 7);
 		set(10, 17);
 		for(k=0; k<6; k++) {
@@ -229,6 +253,6 @@
 usage(void)
 {
 
-	(void)fprintf(stderr, "usage: grdc [-s] [n]\n");
+	(void)fprintf(stderr, "usage: grdc [-s] [n]\n       grdc -t n\n");
 	exit(1);
 }