From a7cf432563ad35ec6d3eb3b520d3fbacad365651 Mon Sep 17 00:00:00 2001
From: Lennart Nachtigall <mail@firesurfer.de>
Date: Fri, 21 Aug 2026 16:07:31 +0200
Subject: [PATCH] String SDO reads need to check for zero terminators

---
 src/internal/soem/soem_backend.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/internal/soem/soem_backend.cpp b/src/internal/soem/soem_backend.cpp
index 9b75f76..6318105 100644
--- a/src/internal/soem/soem_backend.cpp
+++ b/src/internal/soem/soem_backend.cpp
@@ -1256,7 +1256,9 @@ SDOReadValue<std::string> EthercatBus::sdo_read<std::string>(const DeviceId devi
   }
 
   // Create an std::string out of it
-  return SDOReadValue<std::string>(result, std::string(data.begin(), data.begin() + result.actual_size_read));
+  const std::string_view raw{ data.data(), std::min<std::size_t>(result.actual_size_read, data.size()) };
+  const auto text = raw.substr(0, raw.find('\0'));
+  return SDOReadValue<std::string>(result, std::string(text));
 }
 
 template SDOReadValue<bool> EthercatBus::sdo_read<bool>(DeviceId, SDOIndex, SDOSubIndex);