core: add function hdata_count

src/core/core-hdata.c

@@ -656,6 +656,27 @@ end:
     return ret_pointer;
 }
 
+/*
+ * Returns number of item in this hdata, starting at "pointer".
+ */
+
+int
+hdata_count (struct t_hdata *hdata, void *pointer)
+{
+    int count;
+
+    if (!hdata || !pointer)
+        return 0;
+
+    count = 0;
+    while (pointer)
+    {
+        count++;
+        pointer = hdata_move (hdata, pointer, 1);
+    }
+    return count;
+}
+
 /*
  * Extracts index from name of a variable.
  *

src/core/core-hdata.h

@@ -122,6 +122,7 @@ extern void *hdata_search (struct t_hdata *hdata, void *pointer,
                            const char *search, struct t_hashtable *pointers,
                            struct t_hashtable *extra_vars,
                            struct t_hashtable *options, int move);
+extern int hdata_count (struct t_hdata *hdata, void *pointer);
 extern void hdata_get_index_and_name (const char *name, int *index,
                                       const char **ptr_name);
 extern char hdata_char (struct t_hdata *hdata, void *pointer,

tests/unit/core/test-core-hdata.cpp

@@ -1728,6 +1728,21 @@ TEST(CoreHdataWithList, Search)
     hashtable_free (extra_vars);
 }
 
+/*
+ * Tests functions:
+ *   hdata_count
+ */
+
+TEST(CoreHdataWithList, Count)
+{
+    LONGS_EQUAL(0, hdata_count (NULL, NULL));
+    LONGS_EQUAL(0, hdata_count (ptr_hdata, NULL));
+    LONGS_EQUAL(0, hdata_count (NULL, items));
+
+    LONGS_EQUAL(2, hdata_count (ptr_hdata, items));
+    LONGS_EQUAL(1, hdata_count (ptr_hdata, ptr_item2));
+}
+
 /*
  * Tests functions:
  *   hdata_get_index_and_name