Implemented calculation of percentiles and Tukey hinges

[pspp-builds.git] / src / hash.c

diff --git a/src/hash.c b/src/hash.c
index 588b311b45774c37cc52d5476b4a79b24b589b17..2544a75d0dcd025f82668bfc24a47dfaeb2ad70c 100644 (file)
--- a/src/hash.c
+++ b/src/hash.c
@@ -142,7 +142,9 @@ hsh_create (int size, hsh_compare_func *compare, hsh_hash_func *hash,
   struct hsh_table *h;
   int i;
 
-  assert (size > 0);
+  if ( size ==  0 ) 
+    return NULL;
+
   assert (compare != NULL);
   assert (hash != NULL);
   
@@ -175,6 +177,8 @@ hsh_clear (struct hsh_table *h)
 
   for (i = 0; i < h->size; i++)
     h->entries[i] = NULL;
+
+  h->used = 0;
 }
 
 /* Destroys table H and all its contents. */
@@ -259,6 +263,9 @@ comparison_helper (const void *a_, const void *b_, void *h_)
   void *const *b = b_;
   struct hsh_table *h = h_;
 
+  assert(a);
+  assert(b);
+
   return h->compare (*a, *b, h->aux);
 }