From 45150c8ce3555f33eb13ec1f3434bca8d744cad4 Mon Sep 17 00:00:00 2001
From: Christian Ritzmann <st187371@stud.uni-stuttgart.de>
Date: Thu, 19 Feb 2026 00:34:34 +0100
Subject: [PATCH] Fix of by one errors and set the position after the last char
 to a null byte.

---
 src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp b/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp
index 6e30cbef..373aa7d7 100644
--- a/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp
+++ b/src/fsfw/serviceinterface/ServiceInterfacePrinter.cpp
@@ -123,10 +123,11 @@ void fsfwPrint(const sif::PrintLevel printType, const char* fmt, va_list arg) {
   if (replaceLastCharWithNewline) {
     const size_t stringLength = strlen(bufferPosition);
     const size_t lastCharPosition =
-        etl::min(stringLength - 1, fsfwconfig::FSFW_PRINT_BUFFER_SIZE - 2);
+        etl::min(stringLength - 1, fsfwconfig::FSFW_PRINT_BUFFER_SIZE - 3);
     const char lastChar = printBufferArray[bufferIdx][lastCharPosition];
     if (!(lastChar == '\n' or lastChar == '\r')) {
-      printBufferArray[bufferIdx][lastCharPosition] = '\n';
+      printBufferArray[bufferIdx][lastCharPosition + 1] = '\n';
+      printBufferArray[bufferIdx][lastCharPosition + 2] = 0;
     }
   }