[dd] moving oneshot filename check

MBsysC/mbs_common/mbs_module/mbs_dirdyn.c

@@ -194,13 +194,6 @@ int mbs_run_dirdyn(MbsDirdyn* dd, MbsData* mbs_data)
 {
     int err = 0;
 
-    if (dd->options->flag_oneshot)
-    {
-        mbs_msg("\n>>DIRDYN>> One shot evaluation of the direct dynamics is activated.\n");
-        dd->options->resfilename = "oneshot";
-        mbs_msg("\n>>DIRDYN>> Output filename is called oneshot by default.\n");
-    }
-
     // 1. Initialize the simulation
     // - - - - - - - - - - - - - -
     err = mbs_dirdyn_init(dd, mbs_data);
@@ -313,6 +306,10 @@ int mbs_dirdyn_init(MbsDirdyn* dd, MbsData* mbs_data)
     if (dd->options->verbose)
     {
         mbs_msg("\n>>DIRDYN>> Starting direct dynamics module.\n");
+        if (dd->options->flag_oneshot)
+        {
+            mbs_msg("\n>>DIRDYN>> One shot evaluation of the direct dynamics is activated.\n");
+        }
     }
 
     // Checking mbs_data coherence
@@ -476,9 +473,14 @@ int mbs_dirdyn_init(MbsDirdyn* dd, MbsData* mbs_data)
         bufElemNb = (int*)malloc(bufSize * sizeof(int));
 
         // set the filename if not specified
-        if (dd->options->resfilename == NULL) {
+        if (dd->options->resfilename == NULL && !dd->options->flag_oneshot) {
             resfilename = "dirdyn";
         }
+        else if (dd->options->resfilename == NULL && dd->options->flag_oneshot)
+        {
+            resfilename = "oneshot";
+            mbs_msg("\n>>DIRDYN>> Output filename is called 'oneshot' by default.\n");
+        }
         else {
             resfilename = dd->options->resfilename;
         }