query_classifier.cc: query_is_parsed is now global function and can be used to check whether parsing information already exists in the buffer.

skygw_utils.cc: removed replace_str and implemented replace_literal which replaces user-provided literals in query with predefined string "?". Replacing is done one by one, so it is suboptimal ipmlementation since all literals could be passed to replacement function in one call and processed all before returning.

utils/skygw_utils.h

@@ -191,7 +191,13 @@ int skygw_rwlock_unlock(skygw_rwlock_t* rwlock);
 int skygw_rwlock_init(skygw_rwlock_t** rwlock);
 
 int atomic_add(int *variable, int value);
-char* replace_str(const char* str, const char* old, const char* replacement);
 
+EXTERN_C_BLOCK_BEGIN
+
+char* replace_literal(char* haystack, 
+                      const char* needle, 
+                      const char* replacement);
+
+EXTERN_C_BLOCK_END
 
 #endif /* SKYGW_UTILS_H */