-static Item *allitem = 0; /* first of all items */
-static Item *item = 0; /* first of pattern matching items */
-static Item *sel = 0;
-static Item *nextoff = 0;
-static Item *prevoff = 0;
-static Item *curroff = 0;
+static Item *allitem = NULL; /* first of all items */
+static Item *item = NULL; /* first of pattern matching items */
+static Item *sel = NULL;
+static Item *nextoff = NULL;
+static Item *prevoff = NULL;
+static Item *curroff = NULL;