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diff --git a/usr.bin/grdc/grdc.6 b/usr.bin/grdc/grdc.6
--- a/usr.bin/grdc/grdc.6
+++ b/usr.bin/grdc/grdc.6
@@ -1,4 +1,4 @@
-.Dd September 25, 2001
+.Dd January 15, 2023
.Dt GRDC 6
.Os
.Sh NAME
@@ -8,6 +8,9 @@
.Nm
.Op Fl st
.Op Ar n
+.Nm
+.Fl c
+.Ar n
.Sh DESCRIPTION
.Nm
runs a digital clock made of reverse-video blanks on a curses
@@ -17,6 +20,11 @@
it stops after
.Ar n
seconds (default never).
+The clock can act as a countdown timer with the
+.Fl c
+flag,
+.Ar n
+specifies the number of seconds to time for.
The optional
.Fl s
flag makes digits scroll as they change.
@@ -37,8 +45,17 @@
If this variable is not set, the time zone is determined based on
.Pa /etc/localtime .
.El
+.Sh NOTES
+In countdown timer mode, the specifying of
+.Fl n
+> 360000 seconds (100 hours) will lead to the counter displaying
+incorrect remaining time, however it will time correctly, and
+display correctly when the remaining time becomes less than
+100 hours.
.Sh AUTHORS
.An -nosplit
.An Amos Shapir ,
modified for curses by
.An John Lupien .
+Countdown timer mode by
+.An Gavin Atkinson .
diff --git a/usr.bin/grdc/grdc.c b/usr.bin/grdc/grdc.c
--- a/usr.bin/grdc/grdc.c
+++ b/usr.bin/grdc/grdc.c
@@ -1,12 +1,15 @@
/*
* Grand digital clock for curses compatible terminals
* Usage: grdc [-st] [n] -- run for n seconds (default infinity)
- * Flags: -s: scroll
+ * grdc -c n -- countdown n seconds
+ * Flags: -c: Countdown timer mode
+ * -s: scroll
* -t: output time in 12-hour format
*
*
* modified 10-18-89 for curses (jrl)
* 10-18-89 added signal handling
+ * 02-18-02 added countdown timer mode
*
* modified 03-25-03 for 12 hour option
* - Samy Al Bahra <samy@kerneled.com>
@@ -26,6 +29,7 @@
static struct timespec now;
static struct tm *tm;
+static struct timespec end;
static short disp[11] = {
075557, 011111, 071747, 071717, 055711,
@@ -59,18 +63,19 @@
int i, j, s, k;
int n;
int ch;
- int scrol;
- int t12;
+ bool scrol = false, t12 = false, timer = false;
+ int hour, minute, second;
- t12 = scrol = 0;
-
- while ((ch = getopt(argc, argv, "ts")) != -1)
+ while ((ch = getopt(argc, argv, "cst")) != -1)
switch (ch) {
+ case 'c':
+ timer = true;
+ break;
case 's':
- scrol = 1;
+ scrol = true;
break;
case 't':
- t12 = 1;
+ t12 = true;
break;
case '?':
default:
@@ -80,7 +85,7 @@
argc -= optind;
argv += optind;
- if (argc > 1) {
+ if ((argc > 1) || (argc == 0 && timer)) {
usage();
/* NOTREACHED */
}
@@ -95,6 +100,9 @@
} else
n = 0;
+ if (timer && n == 0)
+ return(0);
+
initscr();
signal(SIGINT,sighndl);
@@ -107,7 +115,7 @@
hascolor = has_colors();
- if(hascolor) {
+ if (hascolor) {
start_color();
init_pair(1, COLOR_BLACK, COLOR_RED);
init_pair(2, COLOR_RED, COLOR_BLACK);
@@ -118,7 +126,7 @@
clear();
refresh();
- if(hascolor) {
+ if (hascolor) {
attrset(COLOR_PAIR(3));
mvaddch(YBASE - 2, XBASE - 3, ACS_ULCORNER);
@@ -139,28 +147,42 @@
}
clock_gettime(CLOCK_REALTIME_FAST, &now);
prev_sec = now.tv_sec;
+ if (timer) {
+ end = now;
+ end.tv_sec += n;
+ }
do {
mask = 0;
- tm = localtime(&now.tv_sec);
- set(tm->tm_sec%10, 0);
- set(tm->tm_sec/10, 4);
- set(tm->tm_min%10, 10);
- set(tm->tm_min/10, 14);
-
- if (t12) {
- if (tm->tm_hour < 12) {
- if (tm->tm_hour == 0)
- tm->tm_hour = 12;
- mvaddstr(YBASE + 5, XBASE + 52, "AM");
- } else {
- if (tm->tm_hour > 12)
- tm->tm_hour -= 12;
- mvaddstr(YBASE + 5, XBASE + 52, "PM");
+ if (!timer) {
+ tm = localtime(&now.tv_sec);
+ if (t12) {
+ if (tm->tm_hour < 12) {
+ if (tm->tm_hour == 0)
+ tm->tm_hour = 12;
+ mvaddstr(YBASE + 5, XBASE + 52, "AM");
+ } else {
+ if (tm->tm_hour > 12)
+ tm->tm_hour -= 12;
+ mvaddstr(YBASE + 5, XBASE + 52, "PM");
+ }
}
+ hour = tm->tm_hour;
+ minute = tm->tm_min;
+ second = tm->tm_sec;
+ } else {
+ n = end.tv_sec - now.tv_sec;
+ if (n <= 0)
+ break;
+ hour = (n / 3600) % 100;
+ minute = (n / 60) % 60;
+ second = n % 60;
}
-
- set(tm->tm_hour%10, 20);
- set(tm->tm_hour/10, 24);
+ 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++) {
@@ -266,6 +288,7 @@
usage(void)
{
- (void)fprintf(stderr, "usage: grdc [-st] [n]\n");
+ (void)fprintf(stderr, "usage: grdc [-st] [n]\n"
+ " grdc -c n\n");
exit(1);
}

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