add stringlist_t errorstack to session and functions to deal with it, when -DDEBUG_ERRORSTACK

src/pEpEngine.c

@@ -234,6 +234,10 @@ DYNAMIC_API PEP_STATUS init(PEP_SESSION *session)
 
     _session->version = PEP_ENGINE_VERSION;
 
+#ifdef DEBUG_ERRORSTACK
+    _session->errorstack = new_stringlist(NULL);
+#endif
+
     assert(LOCAL_DB);
     if (LOCAL_DB == NULL) {
         status = PEP_INIT_CANNOT_OPEN_DB;
@@ -749,6 +753,9 @@ DYNAMIC_API void release(PEP_SESSION session)
         release_transport_system(session, out_last);
         release_cryptotech(session, out_last);
 
+#ifdef DEBUG_ERRORSTACK
+        free_stringlist(session->errorstack);
+#endif
         free(session);
     }
 }
@@ -2272,3 +2279,39 @@ DYNAMIC_API PEP_STATUS reset_peptest_hack(PEP_SESSION session)
 
     return PEP_STATUS_OK;
 }
+
+#ifdef DEBUG_ERRORSTACK
+PEP_STATUS session_add_error(PEP_SESSION session, const char* file, unsigned line, PEP_STATUS status)
+{
+    char logline[48];
+    if(status>0)
+    {
+        snprintf(logline,47, "%24s:%u status=%u (0x%x)", file, line, status, status);
+    }else{
+        snprintf(logline,47, "%24s:%u status=%i.", file, line, status);
+    }
+    stringlist_add(session->errorstack, logline); // logline is copied! :-)
+    return status;
+}
+
+DYNAMIC_API const stringlist_t* get_errorstack(PEP_SESSION session)
+{
+    return session->errorstack;
+}
+
+#else
+
+static stringlist_t* dummy_errorstack = NULL;
+
+DYNAMIC_API const stringlist_t* get_errorstack(PEP_SESSION session)
+{
+	if(dummy_errorstack == NULL)
+	{
+		dummy_errorstack = new_stringlist("( Please recompile pEpEngine with -DDEBUG_ERRORSTACK )");
+	}
+	
+    return dummy_errorstack;
+}
+
+#endif
+

src/pEpEngine.h

@@ -147,6 +147,17 @@ DYNAMIC_API PEP_STATUS init(PEP_SESSION *session);
 DYNAMIC_API void release(PEP_SESSION session);
 
 
+// const stringlist_t* get_errorstack(PEP_SESSION) - get the error stack for that session, if any
+//
+//  parameters:
+//        session (in)    session handle
+//
+//    caveat:
+//        To get a useful error stack you have to compile with -DDEBUG_ERRORSTACK
+//        The error stack belongs to the session. Do no not change it!
+DYNAMIC_API const stringlist_t* get_errorstack(PEP_SESSION session);
+
+
 // config_passive_mode() - enable passive mode
 //
 //  parameters:

src/pEp_internal.h

@@ -162,8 +162,12 @@ struct _pEpSession {
     bool use_only_own_private_keys;
     bool keep_sync_msg;
     
+#ifdef DEBUG_ERRORSTACK
+    stringlist_t* errorstack;
+#endif
 };
 
+
 PEP_STATUS init_transport_system(PEP_SESSION session, bool in_first);
 void release_transport_system(PEP_SESSION session, bool out_last);
 
@@ -229,3 +233,11 @@ static inline int _same_fpr(
     
     return ai == fpras && bi == fprbs;
 }
+
+
+#ifdef DEBUG_ERRORSTACK
+    PEP_STATUS session_add_error(PEP_SESSION session, const char* file, unsigned line, PEP_STATUS status);
+    #define ERROR(status)   session_add_error(session, __FILE__, __LINE__, (status))
+#else
+    #define ERROR(status)   (status)
+#endif