From 715704313c301685ef7826900311a00d10e96bd2 Mon Sep 17 00:00:00 2001
From: Torsten Sommer <torsten.sommer@3ds.com>
Date: Thu, 10 Oct 2024 10:16:09 +0200
Subject: [PATCH] Fix buffer size calculation in
 FMIAppendArrayToLogMessageBuffer()

fixes #607
---
 src/FMI.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/FMI.c b/src/FMI.c
index 17865c93..465dc09f 100644
--- a/src/FMI.c
+++ b/src/FMI.c
@@ -310,14 +310,16 @@ void FMIAppendArrayToLogMessageBuffer(FMIInstance* instance, const void* values,
             continue;
         }
 
-        if (length + sizeof(", ") < instance->logMessageBufferSize - instance->logMessageBufferPosition) {
+        const size_t requiredCharacters = length + sizeof(", ");
+
+        if (requiredCharacters < instance->logMessageBufferSize - instance->logMessageBufferPosition) {
 
             instance->logMessageBufferPosition += length;
             i++;
 
         } else {
 
-            while (instance->logMessageBufferSize < instance->logMessageBufferPosition + length) {
+            while (instance->logMessageBufferSize < instance->logMessageBufferPosition + requiredCharacters) {
                 instance->logMessageBufferSize *= 2;
             }