hashmap: Add helper to debug hashmap

Add function to print full hashmap for debug purposes.

Signed-off-by: Otavio Pontes <otavio.pontes@intel.com>

src/lib/hashmap.c

@@ -23,6 +23,7 @@
 #define _GNU_SOURCE
 
 #include <stdbool.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -149,3 +150,34 @@ bool hashmap_contains(struct hashmap *hashmap, const void *key)
 {
 	return hashmap_get_internal(hashmap, key, false) != NULL;
 }
+
+void hashmap_print(struct hashmap *hashmap, void(print_data)(void *data))
+{
+	struct list *l;
+	void *out_data;
+	int i;
+	size_t count = 0;
+
+	if (!hashmap) {
+		return;
+	}
+
+	printf("Hashmap (bits: %x, size: %d)\n", hashmap->mask_bits,
+	       HASH_SIZE(hashmap->mask_bits));
+
+	for (i = 0; i < HASH_SIZE(hashmap->mask_bits); i++) {
+		printf("map[%d] list(%d) {", i, list_len(hashmap->map[i]));
+		for (l = hashmap->map[i], out_data = l ? l->data : NULL;
+		     l && (out_data = l->data); l = l->next) {
+			if (print_data) {
+				print_data(out_data);
+			}
+			count++;
+		}
+		printf("}\n");
+	}
+
+	printf("Total elements: %ld\n", count);
+
+	return;
+}

src/lib/hashmap.h

@@ -69,6 +69,12 @@ void hashmap_free_hash_and_data(struct hashmap *hashmap, free_data_fn_t free_dat
  * Hash function helper to calculate a good hash to be used with strings.
  */
 size_t hashmap_hash_from_string(const char *key);
+
+/*
+ * Print a hashmap, for debug purposes.
+ */
+void hashmap_print(struct hashmap *hashmap, void(print_data)(void *data));
+
 /*
  * Loop through all elements in the hashmap.
  *