From 3941ad41dc97bea2a87c3a9e165a251eb551c54f Mon Sep 17 00:00:00 2001
From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Sun, 2 Jun 2013 13:32:01 +0200
Subject: [PATCH 1/6] rds-ctl: fix percentage handling.

The block_cnt can be 0, and in that case the percentage becomes -nan.
Fix this.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
---
 utils/rds-ctl/rds-ctl.cpp | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/utils/rds-ctl/rds-ctl.cpp b/utils/rds-ctl/rds-ctl.cpp
index de76d9f..191cfee 100644
--- a/utils/rds-ctl/rds-ctl.cpp
+++ b/utils/rds-ctl/rds-ctl.cpp
@@ -523,16 +523,23 @@ static void print_rds_statistics(const struct v4l2_rds_statistics *statistics)
 	printf("received blocks / received groups: %u / %u\n",
 		statistics->block_cnt, statistics->group_cnt);
 
-	float block_error_percentage =
-	((float)statistics->block_error_cnt / statistics->block_cnt) * 100.0;
+	float block_error_percentage = 0;
+
+	if (statistics->block_cnt)
+		block_error_percentage =
+			((float)statistics->block_error_cnt / statistics->block_cnt) * 100.0;
 	printf("block errors / group errors: %u (%3.2f%%) / %u \n",
 		statistics->block_error_cnt,
 		block_error_percentage, statistics->group_error_cnt);
-	float block_corrected_percentage =
-	((float)statistics->block_corrected_cnt / statistics->block_cnt) * 100.0;
+
+	float block_corrected_percentage = 0;
+
+	if (statistics->block_cnt)
+		block_corrected_percentage = (
+			(float)statistics->block_corrected_cnt / statistics->block_cnt) * 100.0;
 	printf("corrected blocks: %u (%3.2f%%)\n",
 		statistics->block_corrected_cnt, block_corrected_percentage);
-	for(int i=0; i<16; i++)
+	for (int i = 0; i < 16; i++)
 		printf("Group %02d: %u\n", i, statistics->group_type_cnt[i]);
 }
 
-- 
1.8.2.1