int prefix = strlen("OCF_RESKEY_");
int prefix = STRLEN_CONST("OCF_RESKEY_");
add_prefix_foreach(gpointer key, gpointer value, gpointer user_data){	const int MAX_LENGTH_OF_ENV = 50;	int prefix = strlen("OCF_RESKEY_");	GHashTable * new_hashtable = (GHashTable *) user_data;	char * newkey;	int keylen = strnlen((char*)key, MAX_LENGTH_OF_ENV-prefix)+prefix+1;		newkey = g_new(gchar, keylen);	strncpy(newkey, "OCF_RESKEY_", keylen);	strncat(newkey, key, keylen);	g_hash_table_insert(new_hashtable, (gpointer)newkey, g_strdup(value));}