From d4c40484f3770ec9763d393d5250d3fba66eeb08 Mon Sep 17 00:00:00 2001
From: Torsten Sommer <torsten.sommer@3ds.com>
Date: Tue, 15 Oct 2024 11:47:45 +0200
Subject: [PATCH] Respect canHandleVariableCommunicationStepSize in
 FMI{2|3}CSSimulation.c (#615)

---
 fmusim/FMI2CSSimulation.c | 10 ++++++++--
 fmusim/FMI3CSSimulation.c |  9 +++++++--
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/fmusim/FMI2CSSimulation.c b/fmusim/FMI2CSSimulation.c
index c9319f54..1224c691 100644
--- a/fmusim/FMI2CSSimulation.c
+++ b/fmusim/FMI2CSSimulation.c
@@ -16,6 +16,8 @@ FMIStatus FMI2CSSimulate(const FMISimulationSettings* s) {
     fmi2Real nextCommunicationPoint = 0.0;
     fmi2Real nextInputEventTime = 0.0;
     fmi2Real stepSize = 0.0;
+    
+    const bool canHandleVariableCommunicationStepSize = s->modelDescription->coSimulation->canHandleVariableCommunicationStepSize;
 
     char resourcePath[FMI_PATH_MAX] = "";
     char resourceURI[FMI_PATH_MAX] = "";
@@ -68,12 +70,16 @@ FMIStatus FMI2CSSimulate(const FMISimulationSettings* s) {
 
         nextInputEventTime = FMINextInputEvent(s->input, time);
 
-        if (nextCommunicationPoint > nextInputEventTime && !FMIIsClose(nextCommunicationPoint, nextInputEventTime)) {
+        if (canHandleVariableCommunicationStepSize &&
+            nextCommunicationPoint > nextInputEventTime &&
+            !FMIIsClose(nextCommunicationPoint, nextInputEventTime)) {
+            
             nextCommunicationPoint = nextInputEventTime;
         }
 
         if (nextCommunicationPoint > s->stopTime && !FMIIsClose(nextCommunicationPoint, s->stopTime)) {
-            if (s->modelDescription->coSimulation->canHandleVariableCommunicationStepSize) {
+            
+            if (canHandleVariableCommunicationStepSize) {
                 nextCommunicationPoint = s->stopTime;
             } else {
                 break;
diff --git a/fmusim/FMI3CSSimulation.c b/fmusim/FMI3CSSimulation.c
index 572e6666..049531b6 100644
--- a/fmusim/FMI3CSSimulation.c
+++ b/fmusim/FMI3CSSimulation.c
@@ -37,6 +37,7 @@ FMIStatus FMI3CSSimulate(const FMISimulationSettings* s) {
     FMIStatus status = FMIOK;
 
     FMIInstance* S = s->S;
+    const bool canHandleVariableCommunicationStepSize = s->modelDescription->coSimulation->canHandleVariableCommunicationStepSize;
 
     fmi3Boolean inputEvent = fmi3False;
     fmi3Boolean eventEncountered = fmi3False;
@@ -141,12 +142,16 @@ FMIStatus FMI3CSSimulate(const FMISimulationSettings* s) {
 
         nextInputEventTime = FMINextInputEvent(s->input, time);
 
-        if (nextCommunicationPoint > nextInputEventTime && !FMIIsClose(nextCommunicationPoint, nextInputEventTime)) {
+        if (canHandleVariableCommunicationStepSize &&
+            nextCommunicationPoint > nextInputEventTime &&
+            !FMIIsClose(nextCommunicationPoint, nextInputEventTime)) {
+
             nextCommunicationPoint = nextInputEventTime;
         }
 
         if (nextCommunicationPoint > s->stopTime && !FMIIsClose(nextCommunicationPoint, s->stopTime)) {
-            if (s->modelDescription->coSimulation->canHandleVariableCommunicationStepSize) {
+
+            if (canHandleVariableCommunicationStepSize) {
                 nextCommunicationPoint = s->stopTime;
             } else {
                 break;