From cbca03efe083ad2efa28b7f65c1e3232344baabc Mon Sep 17 00:00:00 2001
From: =?utf8?q?Wolfgang=20St=C3=B6ggl?= <c72578@yahoo.de>
Date: Thu, 22 Aug 2019 14:18:35 +0200
Subject: [PATCH] Fix compiler warning (-Wstringop-truncation)
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- Use strncat() the following way in rrd_cgi.c:
  strncat(dest, src, dest_size - strlen(dest) - 1);

- Fixes the following gcc compiler warning:
  rrd_cgi.c:1407:21: warning: ‘strncat’ output truncated before
  terminating nul copying as many bytes from a string as its length
  [-Wstringop-truncation]
  strncat(line, tmp, tmplen);
---
 src/rrd_cgi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/rrd_cgi.c b/src/rrd_cgi.c
index 779b8465..35be69d6 100644
--- a/src/rrd_cgi.c
+++ b/src/rrd_cgi.c
@@ -1404,7 +1404,7 @@ static s_var **rrdcgiReadVariables(
                 if ((unsigned) length > tmplen) {
                     if ((line = (char *) realloc(line, len)) == NULL)
                         return NULL;
-                    strncat(line, tmp, tmplen);
+                    strncat(line, tmp, len - strlen(line) - 1);
                 } else {
                     /* clean-up the storage allocated in previous iteration */
                     if (line) {
-- 
2.47.3