[PATCH 1/5] fsdosfsname01: Fix string truncation warning

[Frank Kuehndel]

From: Frank Kühndel <frank.kuehndel at embedded-brains.de>

This patch fixes a compiler warning:

../../../testsuites/fstests/fsdosfsname01/init.c:430:19: warning:
'%s' directive output may be truncated writing up to 6424 bytes into
a region of size 257 [-Wformat-truncation=]

The buffer 'dirname' is exactly large enough so that no truncation
can ever occur. Using the return value of snprintf() is an official
supported way to suppress the warning.

I considered the comment of Joel Sherrill about not replacing snprintf():
https://lists.rtems.org/pipermail/devel/2020-September/062113.html
---
 testsuites/fstests/fsdosfsname01/init.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/testsuites/fstests/fsdosfsname01/init.c b/testsuites/fstests/fsdosfsname01/init.c
index 3689da8eed..a916e392f7 100644
--- a/testsuites/fstests/fsdosfsname01/init.c
+++ b/testsuites/fstests/fsdosfsname01/init.c
@@ -422,14 +422,15 @@ static void test_creating_invalid_directories( void )
   unsigned int index;
   int          rc;
   char         dirname[MAX_NAME_LENGTH_INVALID + MOUNT_DIR_SIZE + 1];
-
+  int          len;
 
   for ( index = 0; index < NUMBER_OF_DIRECTORIES_INVALID; ++index ) {
-    snprintf( dirname,
-              sizeof( dirname ),
-              "%s/%s",
-              MOUNT_DIR,
-              DIRECTORY_NAMES_INVALID[index] );
+    len = snprintf( dirname,
+                    sizeof( dirname ),
+                    "%s/%s",
+                    MOUNT_DIR,
+                    DIRECTORY_NAMES_INVALID[index] );
+    rtems_test_assert( len < sizeof( dirname ) );
     rc = mkdir( dirname, S_IRWXU | S_IRWXG | S_IRWXO );
     rtems_test_assert( rc == -1 );
   }
-- 
2.26.2