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From 1ce974f1cf6afbc528c941a8cdf0817a3fd7c5a7 Mon Sep 17 00:00:00 2001
From: "Roy.Li" <rongqing.li@windriver.com>
Date: Mon, 30 Mar 2026 22:37:22 +0800
Subject: [PATCH] fix the empty file writting
With the feature that checking the disk filled up, the return
value of function write_behind was checked and used to detect
the disk status. While for empty file, without data being
written, this function will return -1 thus the disk filled up
error was miss-raised.
make write_behind to return 0 if written file is empty, to fix
the this bug.
Upstream-Status: Pending
Signed-off-by: Roy.Li <rongqing.li@windriver.com>
---
common/tftpsubs.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/common/tftpsubs.c b/common/tftpsubs.c
index b4ea3f2..30e749a 100644
--- a/common/tftpsubs.c
+++ b/common/tftpsubs.c
@@ -198,9 +198,12 @@ int write_behind(FILE * file, int convert)
nextone = !nextone; /* incr for next time */
buf = dp->th_data;
- if (count <= 0)
+ if (count < 0)
return -1; /* nak logic? */
+ if (count == 0)
+ return 0;
+
if (convert == 0)
return write(fileno(file), buf, count);
--
2.34.1
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