From 42be53abf97aa037bdab04e66eb2be6cee191f0e Mon Sep 17 00:00:00 2001
From: Thomas Markwalder <tmark@isc.org>
Date: Thu, 28 Aug 2025 12:28:08 -0400
Subject: [PATCH] [#3531] test empty case

modified:   src/lib/util/str.cc
modified:   src/lib/util/tests/str_unittests.cc
---
 src/lib/util/str.cc                 | 3 +++
 src/lib/util/tests/str_unittests.cc | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/src/lib/util/str.cc b/src/lib/util/str.cc
index 818163d642..142b186ad0 100644
--- a/src/lib/util/str.cc
+++ b/src/lib/util/str.cc
@@ -349,6 +349,9 @@ dumpDouble(double val, size_t precision) {
 
 std::string
 printOrDump(const std::vector<uint8_t>& data, size_t max_dump) {
+    if (data.empty()) {
+        return ("");
+    }
 
     auto it = data.begin();
     bool print_it = true;
diff --git a/src/lib/util/tests/str_unittests.cc b/src/lib/util/tests/str_unittests.cc
index 9e35086403..0afcdda8e9 100644
--- a/src/lib/util/tests/str_unittests.cc
+++ b/src/lib/util/tests/str_unittests.cc
@@ -537,6 +537,12 @@ TEST_F(StringUtilTest, printOrDump) {
     };
 
     std::list<Scenario> scenarios {
+        {
+            __LINE__,
+            { },
+            1,
+            ""
+        },
         {
             __LINE__,
             { '1', '2', '3', 0, 0 },
-- 
2.47.3