test: silence -Wformat-truncation= warnings

this change silences following warnings:

: warning: ‘%s’ directive output may be truncated writing up to 127
bytes into a region of size between 109 and 119 [-W
format-truncation=]
     snprintf(m_id_str, SysTestRunnable::ID_STR_SZ, "process_%d%s",
m_id, extra);
                                                    ^~~~~~~~~~~~~~
~~~~~

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/test/system/systest_runnable.cc b/src/test/system/systest_runnable.cc
index 7a97f2ffbba4ea7778f5ae65d2afd893fd016c2d..98cb1741a7768ae7b2edb0b9a2193ac0305c51f2 100644 (file)
--- a/src/test/system/systest_runnable.cc
+++ b/src/test/system/systest_runnable.cc
@@ -29,8 +29,9 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
-#include <vector>
 #include <atomic>
+#include <limits>
+#include <vector>
 
 using std::ostringstream;
 using std::string;
@@ -176,7 +177,7 @@ void SysTestRunnable::
 update_id_str(bool started)
 {
   bool use_threads = SysTestSettings::inst().use_threads();
-  char extra[128];
+  char extra[std::numeric_limits<int>::digits10 + 1];
   extra[0] = '\0';
 
   if (started) {