New function and bug fix

git-svn-id: svn://svn.cc65.org/cc65/trunk@2609 b7a2c559-68d2-44c3-8de9-860c34a00d81

src/common/hashtab.c

@@ -77,7 +77,22 @@ static void HT_Alloc (HashTable* T)
 HashNode* HT_Find (const HashTable* T, const void* Key)
 /* Find the node with the given index */
 {
-    unsigned  Hash;
+    /* If we don't have a table, there's nothing to find */
+    if (T->Table == 0) {
+        return 0;
+    }
+
+    /* Search for the entry */
+    return HT_FindHash (T, Key, T->Func->GenHash (Key));
+}
+
+
+
+HashNode* HT_FindHash (const HashTable* T, const void* Key, unsigned Hash)
+/* Find the node with the given key. Differs from HT_Find in that the hash
+ * for the key is precalculated and passed to the function.
+ */
+{
     HashNode* N;
 
     /* If we don't have a table, there's nothing to find */
@@ -85,9 +100,6 @@ HashNode* HT_Find (const HashTable* T, const void* Key)
         return 0;
     }
 
-    /* Generate the hash over the index */
-    Hash = T->Func->GenHash (Key);
-
     /* Search for the entry in the given chain */
     N = T->Table[Hash % T->Slots];
     while (N) {
@@ -96,7 +108,7 @@ HashNode* HT_Find (const HashTable* T, const void* Key)
          * if it is not really necessary.
          */
         if (N->Hash == Hash &&
-            T->Func->Compare (Key, T->Func->GetKey (N->Entry)) == 0) {
+            T->Func->Compare (Key, T->Func->GetKey (HN_GetEntry (N))) == 0) {
             /* Found */
             break;
         }
@@ -118,7 +130,7 @@ void* HT_FindEntry (const HashTable* T, const void* Key)
     HashNode* N = HT_Find (T, Key);
 
     /* Convert the node into an entry if necessary */
-    return N? N->Entry : 0;
+    return N? HN_GetEntry (N) : 0;
 }
 
 
@@ -134,7 +146,7 @@ void HT_Insert (HashTable* T, HashNode* N)
     }
 
     /* Generate the hash over the node key. */
-    N->Hash = T->Func->GenHash (T->Func->GetKey (N->Entry));
+    N->Hash = T->Func->GenHash (T->Func->GetKey (HN_GetEntry (N)));
 
     /* Calculate the reduced hash */
     RHash = N->Hash % T->Slots;
@@ -182,7 +194,7 @@ void HT_Walk (HashTable* T, void (*F) (void* Entry, void* Data), void* Data)
         /* Walk over all entries in this chain */
         while (N) {
             /* Call the user function */
-            F (N->Entry, Data);
+            F (HN_GetEntry (N), Data);
             /* Next node in chain */
             N = N->Next;
         }

src/common/hashtab.h

@@ -109,10 +109,20 @@ INLINE void InitHashNode (HashNode* N, void* Entry)
     N->Entry    = Entry;
 }
 #else
-#define InitHashNode(N, Entry)  \
+#define InitHashNode(N, E)  	\
-    (N)->Next   = 0;            \
+    (N)->Next   = 0,            \
-    (N)->Owner  = 0;            \
+    (N)->Owner  = 0,            \
-    (N)->Entry  = (Entry)
+    (N)->Entry  = (E)	
+#endif
+
+#if defined(HAVE_INLINE)
+INLINE void* HN_GetEntry (HashNode* N)
+/* Get the entry from a hash node */
+{
+    return N->Entry;
+}
+#else
+#define HN_GetEntry(N)          (N)->Entry
 #endif
 
 
@@ -175,6 +185,11 @@ void FreeHashTable (HashTable* T);
 HashNode* HT_Find (const HashTable* T, const void* Key);
 /* Find the node with the given key*/
 
+HashNode* HT_FindHash (const HashTable* T, const void* Key, unsigned Hash);
+/* Find the node with the given key. Differs from HT_Find in that the hash
+ * for the key is precalculated and passed to the function.
+ */
+
 void* HT_FindEntry (const HashTable* T, const void* Key);
 /* Find the node with the given key and return the corresponding entry */