From 2c876774a90ddb7478937ead096937f64e6bd7ec Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Wed, 10 Jan 2018 11:04:09 +0100
Subject: dd: fixed partial count logic

$ busybox dd if=/dev/zero of=/dev/loop0 bs=100M count=8; echo $?
8+0 records in
7+0 records out  <=========== FIXED, was 7+1
805220352 bytes (767.9MB) copied, 0.464010 seconds, 1.6GB/s
1

function                                             old     new   delta
write_and_stats                                       97      99      +2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
 coreutils/dd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'coreutils/dd.c')

diff --git a/coreutils/dd.c b/coreutils/dd.c
index 9d173cc13..38b2a6aa1 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -202,8 +202,10 @@ static bool write_and_stats(const void *buf, size_t len, size_t obs,
 		G.out_full++;
 		return 0;
 	}
-	if (n) /* > 0 */
+	if ((size_t)n == len) {
 		G.out_part++;
+		return 0;
+	}
 	return 1;
 }
 
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