From 8af384fe4a8ef40ed8cf73e00b9f7a392c46909e Mon Sep 17 00:00:00 2001
From: dg <dg@FreeBSD.org>
Date: Fri, 5 May 1995 06:15:11 +0000
Subject: Check for 0 before dividing by it. Patch from Paul Traina, modified
 slightly by me.

---
 sys/dev/speaker/spkr.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'sys/dev')

diff --git a/sys/dev/speaker/spkr.c b/sys/dev/speaker/spkr.c
index f9c72d6..170abb8 100644
--- a/sys/dev/speaker/spkr.c
+++ b/sys/dev/speaker/spkr.c
@@ -4,7 +4,7 @@
  * v1.4 by Eric S. Raymond (esr@snark.thyrsus.com) Aug 1993
  * modified for FreeBSD by Andrew A. Chernov <ache@astral.msk.su>
  *
- *    $Id: spkr.c,v 1.11 1995/02/03 10:19:38 ache Exp $
+ *    $Id: spkr.c,v 1.12 1995/03/16 18:12:05 bde Exp $
  */
 
 #include "speaker.h"
@@ -66,9 +66,14 @@ static void tone(thz, ticks)
 /* emit tone of frequency thz for given number of ticks */
 unsigned int thz, ticks;
 {
-    unsigned int divisor = TIMER_CLK / thz;
+    unsigned int divisor;
     int sps;
 
+    if (thz <= 0)
+	return;
+
+    divisor = TIMER_CLK / thz;
+
 #ifdef DEBUG
     (void) printf("tone: thz=%d ticks=%d\n", thz, ticks);
 #endif /* DEBUG */
@@ -201,6 +206,9 @@ int	pitch, value, sustain;
 	sdenom *= DENOM_MULT;
     }
 
+    if (value == 0 || sdenom == 0)
+	return;
+
     if (pitch == -1)
 	rest(whole * snum / (value * sdenom));
     else
-- 
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