More string and buffer functions.

[apps/madmutt.git] / lib-lib / hash.c

diff --git a/lib-lib/hash.c b/lib-lib/hash.c
index 5520389..c703def 100644 (file)
--- a/lib-lib/hash.c
+++ b/lib-lib/hash.c
@@ -28,50 +28,66 @@
 
 int hash_string(const unsigned char *s, int n)
 {
-    int h = 0;
+    unsigned h = 0;
 
     while (*s) {
         h += (h << 7) + *s++;
     }
-    h = (h * SOMEPRIME) % n;
-    h = (h >= 0) ? h : h + n;
 
-    return (h % n);
+    return (h * SOMEPRIME) % n;
 }
 
-HASH *hash_create(int nelem)
+hash_t *hash_init(hash_t *table, int nelem, int allow_dup)
 {
-    HASH *table = p_new(HASH, 1);
-
-    if (nelem == 0)
-        nelem = 2;
-
-    table->nelem    = nelem;
+    table->dupes    = allow_dup;
+    table->nelem    = MAX(nelem, 2);
     table->curnelem = 0;
-    table->table    = p_new(struct hash_elem *, nelem);
+    table->table    = p_new(struct hash_elem *, table->nelem);
     return table;
 }
 
-HASH *hash_resize(HASH *ptr, int nelem)
+/* ptr         pointer to the hash table to be freed
+ * destroy()   function to call to free the ->data member (optional) 
+ */
+void hash_wipe(hash_t *h, void (*dtor)(void *))
+{
+    int i;
+
+    for (i = 0; i < h->nelem; i++) {
+        struct hash_elem *elem, *tmp;
+
+        for (elem = h->table[i]; elem;) {
+            tmp = elem;
+            elem = elem->next;
+            if (dtor)
+                dtor(tmp->data);
+            p_delete(&tmp);
+        }
+    }
+    p_delete(&h->table);
+}
+
+void hash_resize(hash_t *ptr, int nelem)
 {
-    HASH *table;
-    struct hash_elem *elem, *tmp;
+    hash_t table;
     int i;
 
-    table = hash_create (nelem);
+    /* XXX hack: we know the has was correct, no dupe checks is fater */
+    hash_init(&table, nelem, 1);
 
     for (i = 0; i < ptr->nelem; i++) {
+        struct hash_elem *elem, *tmp;
         for (elem = ptr->table[i]; elem;) {
             tmp = elem;
             elem = elem->next;
-            hash_insert(table, tmp->key, tmp->data, 1);
+            hash_insert(&table, tmp->key, tmp->data);
             p_delete(&tmp);
         }
     }
-    p_delete(&ptr->table);
-    p_delete(&ptr);
 
-    return table;
+    p_delete(&ptr->table);
+    ptr->nelem = table.nelem;
+    ptr->table = table.table;
 }
 
 /* table        hash table to update
@@ -79,7 +95,7 @@ HASH *hash_resize(HASH *ptr, int nelem)
  * data         data to associate with `key'
  * allow_dup    if nonzero, duplicate keys are allowed in the table 
  */
-int hash_insert(HASH *table, const char *key, void *data, int allow_dup)
+int hash_insert(hash_t *table, const char *key, void *data)
 {
     struct hash_elem *ptr;
     int h;
@@ -89,48 +105,46 @@ int hash_insert(HASH *table, const char *key, void *data, int allow_dup)
     ptr->key = key;
     ptr->data = data;
 
-    if (allow_dup) {
+    if (table->dupes) {
         ptr->next = table->table[h];
         table->table[h] = ptr;
         table->curnelem++;
     } else {
-        struct hash_elem *tmp, *last;
-        int r;
+        struct hash_elem **e;
+
+        for (e = &table->table[h]; *e; e = &(*e)->next) {
+            int r = m_strcmp((*e)->key, key);
 
-        for (tmp = table->table[h], last = NULL; tmp; last = tmp, tmp = tmp->next) {
-            r = m_strcmp(tmp->key, key);
             if (r == 0) {
                 p_delete(&ptr);
-                return (-1);
+                return -1;
             }
             if (r > 0)
                 break;
         }
-        if (last) {
-            last->next = ptr;
-        } else {
-            table->table[h] = ptr;
-        }
-        ptr->next = tmp;
+        ptr->next = *e;
+        *e = ptr;
         table->curnelem++;
     }
     return h;
 }
 
-void *hash_find_hash(const HASH *table, int hash, const char *key)
+void *hash_find(const hash_t *table, const char *key)
 {
+    int hash = hash_string((unsigned char*)key, table->nelem);
     struct hash_elem *ptr;
 
     for (ptr = table->table[hash]; ptr; ptr = ptr->next) {
         if (m_strcmp(key, ptr->key) == 0)
-            return (ptr->data);
+            return ptr->data;
     }
     return NULL;
 }
 
-void hash_delete_hash(HASH *table, int hash, const char *key, const void *data,
-                      void (*destroy)(void *))
+void hash_remove(hash_t *table, const char *key, const void *data,
+                 void (*destroy)(void *))
 {
+    int hash = hash_string((unsigned char*)key, table->nelem);
     struct hash_elem *ptr   = table->table[hash];
     struct hash_elem **last = &table->table[hash];
 
@@ -149,29 +163,7 @@ void hash_delete_hash(HASH *table, int hash, const char *key, const void *data,
     }
 }
 
-/* ptr         pointer to the hash table to be freed
- * destroy()   function to call to free the ->data member (optional) 
- */
-void hash_destroy(HASH **ptr, void (*destroy)(void *))
-{
-    int i;
-    HASH *pptr = *ptr;
-    struct hash_elem *elem, *tmp;
-
-    for (i = 0; i < pptr->nelem; i++) {
-        for (elem = pptr->table[i]; elem;) {
-            tmp = elem;
-            elem = elem->next;
-            if (destroy)
-                destroy (tmp->data);
-            p_delete(&tmp);
-        }
-    }
-    p_delete(&pptr->table);
-    p_delete(ptr);
-}
-
-void hash_map(HASH *table,
+void hash_map(hash_t *table,
               void (*mapfunc)(const char* key, void* data, unsigned long more),
               unsigned long more)
 {