diff --git a/hash.c b/hash.c
index 608a552..681b925 100644
--- a/hash.c
+++ b/hash.c
@@ -37,6 +37,11 @@
 #include <stdlib.h>
 #include <stddef.h>
 
+#if HASH_DEBUG
+#include <stdio.h>
+#include <string.h>
+#endif
+
 #include "gap.h"
 
 typedef void* hash_item;
@@ -44,6 +49,16 @@ typedef void* hash_item;
 
 static void* const FREE = NULL;
 
+
+/* Define DEBUG adds two functions:
+ * hash_dump() that prints the hash to a file as text
+ * hash_item_print() takes a pointer to a function that prints a hash item
+ * See test suite in hashtest/ for an example
+ *  */
+/*
+#define HASH_DEBUG 1
+*/
+
 struct hash {
     int hash_size;      /* Max number of items in the hash */
     int item_cnt;       /* Number of items in the hash */
@@ -51,6 +66,9 @@ struct hash {
 
     hash_make_key_fn hash_make_key;
     hash_cmp_item_fn cmp_item;
+#ifdef HASH_DEBUG
+    void (*hash_item_print)(FILE* out, hash_item item);
+#endif
 };
 
 typedef struct hash hash;
@@ -188,17 +206,16 @@ int hash_remove(hash* h, hash_item item)
     return 0;
 }
 
-#if HASH_TESTING
-#include <stdio.h>
-#include <string.h>
-#define STR_LENGTH 16
-struct hash_item {
-    int wanted_index;
-    char str[STR_LENGTH];
-};
+/******************************************************************************/
+#if HASH_DEBUG
+void hash_item_print(hash* h, void fn(FILE*, hash_item))
+{
+    h->hash_item_print = fn;
+}
+
+
 void hash_dump(hash* h, char* filename)
 {
-    char str[STR_LENGTH];
     FILE* out = fopen(filename, "w");
 
     if (!out) {
@@ -209,14 +226,13 @@ void hash_dump(hash* h, char* filename)
     fprintf(out, "<hash elem=%d>\n", h->item_cnt);
     for (int i = 0; i < h->hash_size; i++) {
         hash_item item = gap_get(h->data, i);
-        int idx = 0;
 
-        memset(str, 0, STR_LENGTH);
-        if (item) {
-            idx = hash_make_key(h, item);
-            memcpy(str, ((struct hash_item*)item)->str, STR_LENGTH);
-        }
-        fprintf(out, "\t%d:%d:%s\n", i, idx, str);
+        fprintf(out, "\t%d:", i);
+        if (item)
+            h->hash_item_print(out, item);
+        else
+            fprintf(out, "<empty>");
+        fprintf(out, "\n");
     }
     fprintf(out, "</hash>\n");
     fclose(out);
diff --git a/hashtest/Makefile b/hashtest/Makefile
index 9cb67c6..168319c 100644
--- a/hashtest/Makefile
+++ b/hashtest/Makefile
@@ -1,5 +1,5 @@
 
-CFLAGS=-DHASH_TESTING -O2 -Wall
+CFLAGS=-DHASH_DEBUG -O2 -Wall
 OBJ=../hash.o ../gap.o htest.o
 
 htest: $(OBJ)
diff --git a/hashtest/delete.tst.ref b/hashtest/delete.tst.ref
index ca930bb..8513842 100644
--- a/hashtest/delete.tst.ref
+++ b/hashtest/delete.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=4>
-	0:0:
-	1:0:
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
+	0:<empty>
+	1:<empty>
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
 	10:10:aa
 	11:10:ab
 	12:10:ac
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
+	13:<empty>
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
 	20:20:ba
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
-	30:0:
-	31:0:
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
+	30:<empty>
+	31:<empty>
 </hash>
diff --git a/hashtest/delete_at_end.tst.ref b/hashtest/delete_at_end.tst.ref
index c9ba1e5..0d57c3b 100644
--- a/hashtest/delete_at_end.tst.ref
+++ b/hashtest/delete_at_end.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=4>
-	0:0:
-	1:0:
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
+	0:<empty>
+	1:<empty>
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
 	10:10:aa
 	11:10:ab
 	12:12:ac
 	13:13:ad
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
-	30:0:
-	31:0:
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
+	30:<empty>
+	31:<empty>
 </hash>
diff --git a/hashtest/delete_below_floor.tst.ref b/hashtest/delete_below_floor.tst.ref
index d256c1f..e8f70eb 100644
--- a/hashtest/delete_below_floor.tst.ref
+++ b/hashtest/delete_below_floor.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=5>
 	0:30:ad
-	1:0:
+	1:<empty>
 	2:2:ba
 	3:2:bb
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
-	10:0:
-	11:0:
-	12:0:
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
+	10:<empty>
+	11:<empty>
+	12:<empty>
+	13:<empty>
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
 	30:30:aa
 	31:30:ac
 </hash>
diff --git a/hashtest/delete_discont.tst.ref b/hashtest/delete_discont.tst.ref
index 18b76f8..76e3be0 100644
--- a/hashtest/delete_discont.tst.ref
+++ b/hashtest/delete_discont.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=4>
-	0:0:
-	1:0:
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
+	0:<empty>
+	1:<empty>
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
 	10:10:aa
 	11:10:bc
 	12:12:ac
-	13:0:
+	13:<empty>
 	14:14:ad
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
-	30:0:
-	31:0:
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
+	30:<empty>
+	31:<empty>
 </hash>
diff --git a/hashtest/delete_empty.tst.ref b/hashtest/delete_empty.tst.ref
index c7539cf..1507083 100644
--- a/hashtest/delete_empty.tst.ref
+++ b/hashtest/delete_empty.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=0>
-	0:0:
-	1:0:
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
-	10:0:
-	11:0:
-	12:0:
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
-	30:0:
-	31:0:
+	0:<empty>
+	1:<empty>
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
+	10:<empty>
+	11:<empty>
+	12:<empty>
+	13:<empty>
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
+	30:<empty>
+	31:<empty>
 </hash>
diff --git a/hashtest/delete_full.tst.ref b/hashtest/delete_full.tst.ref
index 3cc373a..78d58e8 100644
--- a/hashtest/delete_full.tst.ref
+++ b/hashtest/delete_full.tst.ref
@@ -20,7 +20,7 @@
 	18:18:bi
 	19:19:bj
 	20:20:ca
-	21:0:
+	21:<empty>
 	22:22:cd
 	23:23:ce
 	24:24:cf
diff --git a/hashtest/delete_middle.tst.ref b/hashtest/delete_middle.tst.ref
index 1d27ad8..13994d2 100644
--- a/hashtest/delete_middle.tst.ref
+++ b/hashtest/delete_middle.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=4>
-	0:0:
-	1:0:
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
+	0:<empty>
+	1:<empty>
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
 	10:10:ab
-	11:0:
+	11:<empty>
 	12:12:ac
 	13:13:ad
 	14:14:ae
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
-	30:0:
-	31:0:
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
+	30:<empty>
+	31:<empty>
 </hash>
diff --git a/hashtest/delete_wrap.tst.ref b/hashtest/delete_wrap.tst.ref
index aabc8bd..9bd93d6 100644
--- a/hashtest/delete_wrap.tst.ref
+++ b/hashtest/delete_wrap.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=4>
 	0:30:ba
 	1:30:bb
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
-	10:0:
-	11:0:
-	12:0:
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
+	10:<empty>
+	11:<empty>
+	12:<empty>
+	13:<empty>
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
 	30:30:aa
 	31:30:ab
 </hash>
diff --git a/hashtest/delete_wrap_at_end.tst.ref b/hashtest/delete_wrap_at_end.tst.ref
index aa6683a..8abdc5b 100644
--- a/hashtest/delete_wrap_at_end.tst.ref
+++ b/hashtest/delete_wrap_at_end.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=5>
 	0:30:ac
 	1:1:ad
-	2:0:
+	2:<empty>
 	3:3:ae
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
-	10:0:
-	11:0:
-	12:0:
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
+	10:<empty>
+	11:<empty>
+	12:<empty>
+	13:<empty>
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
 	30:30:aa
 	31:30:ab
 </hash>
diff --git a/hashtest/delete_wrap_below_floor.tst.ref b/hashtest/delete_wrap_below_floor.tst.ref
index c47ff54..6dc5b19 100644
--- a/hashtest/delete_wrap_below_floor.tst.ref
+++ b/hashtest/delete_wrap_below_floor.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=3>
 	0:30:ad
-	1:0:
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
-	10:0:
-	11:0:
-	12:0:
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
+	1:<empty>
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
+	10:<empty>
+	11:<empty>
+	12:<empty>
+	13:<empty>
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
 	30:30:aa
 	31:30:ac
 </hash>
diff --git a/hashtest/delete_wrap_discont.tst.ref b/hashtest/delete_wrap_discont.tst.ref
index d734495..ba4f284 100644
--- a/hashtest/delete_wrap_discont.tst.ref
+++ b/hashtest/delete_wrap_discont.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=5>
 	0:31:ad
-	1:0:
+	1:<empty>
 	2:2:ba
 	3:3:bb
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
-	10:0:
-	11:0:
-	12:0:
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
-	20:0:
-	21:0:
-	22:0:
-	23:0:
-	24:0:
-	25:0:
-	26:0:
-	27:0:
-	28:0:
-	29:0:
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
+	10:<empty>
+	11:<empty>
+	12:<empty>
+	13:<empty>
+	14:<empty>
+	15:<empty>
+	16:<empty>
+	17:<empty>
+	18:<empty>
+	19:<empty>
+	20:<empty>
+	21:<empty>
+	22:<empty>
+	23:<empty>
+	24:<empty>
+	25:<empty>
+	26:<empty>
+	27:<empty>
+	28:<empty>
+	29:<empty>
 	30:30:aa
 	31:30:ac
 </hash>
diff --git a/hashtest/htest b/hashtest/htest
index 90a62e3..119f688 100755
Binary files a/hashtest/htest and b/hashtest/htest differ
diff --git a/hashtest/htest.c b/hashtest/htest.c
index dacb27e..55c0cf9 100644
--- a/hashtest/htest.c
+++ b/hashtest/htest.c
@@ -55,6 +55,11 @@ static void htest_next_key(FILE* f, char* action, int* key, char str[STR_LENGTH]
     if (res == EOF) exit(0);
 }
 
+static void item_print(FILE* out, hash_item item)
+{
+    fprintf(out, "%d:%s", item->wanted_index, item->str);
+}
+
 int main(int argc, char* argv[])
 {
     hash* h = hash_init(HASH_SIZE, &hash_make_key, &cmp_item);
@@ -63,6 +68,8 @@ int main(int argc, char* argv[])
     int line = 0;
     FILE* f;
 
+    hash_item_print(h, item_print);
+
     if (argc != 3) {
         fprintf(stderr, "Usage: htest <script file> <dump file>\n");
         exit(1);
diff --git a/hashtest/insert.tst.ref b/hashtest/insert.tst.ref
index 2f3efc9..fdbff98 100644
--- a/hashtest/insert.tst.ref
+++ b/hashtest/insert.tst.ref
@@ -1,34 +1,34 @@
 <hash elem=5>
-	0:0:
-	1:0:
-	2:0:
-	3:0:
-	4:0:
-	5:0:
-	6:0:
-	7:0:
-	8:0:
-	9:0:
+	0:<empty>
+	1:<empty>
+	2:<empty>
+	3:<empty>
+	4:<empty>
+	5:<empty>
+	6:<empty>
+	7:<empty>
+	8:<empty>
+	9:<empty>
 	10:10:aa
 	11:10:ab
 	12:10:ac
-	13:0:
-	14:0:
-	15:0:
-	16:0:
-	17:0:
-	18:0:
-	19:0:
+	13:<empty>
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 </hash>
diff --git a/hashtest/insert_discont.tst.ref b/hashtest/insert_discont.tst.ref
index bef2a57..f6e64f0 100644
--- a/hashtest/insert_discont.tst.ref
+++ b/hashtest/insert_discont.tst.ref
@@ -1,34 +1,34 @@
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 </hash>
diff --git a/hashtest/insert_full_floor.tst.ref b/hashtest/insert_full_floor.tst.ref
index 3823346..c249f1c 100644
--- a/hashtest/insert_full_floor.tst.ref
+++ b/hashtest/insert_full_floor.tst.ref
@@ -3,32 +3,32 @@
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 </hash>
diff --git a/hashtest/insert_wrap.tst.ref b/hashtest/insert_wrap.tst.ref
index 6ccb959..5e0c312 100644
--- a/hashtest/insert_wrap.tst.ref
+++ b/hashtest/insert_wrap.tst.ref
@@ -3,32 +3,32 @@
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 </hash>