From 52f2814593b57fea3aec5baccf7b332840e1a97d Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Fri, 17 Jun 2005 14:56:08 +0000
Subject: [PATCH] Added HASH_ZERO_FILL switch. Tired of explicit initializers.

---
 lib/hash-test.c |  1 +
 lib/hashtable.h | 17 +++++++++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/lib/hash-test.c b/lib/hash-test.c
index 31af3c0f..1b5ee45c 100644
--- a/lib/hash-test.c
+++ b/lib/hash-test.c
@@ -17,6 +17,7 @@ struct node1 {
 #define HASH_PREFIX(x) test1_##x
 #define HASH_KEY_ATOMIC key
 #define HASH_ATOMIC_TYPE int
+#define HASH_ZERO_FILL
 
 #define HASH_GIVE_INIT_DATA
 static inline void test1_init_data(struct node1 *n)
diff --git a/lib/hashtable.h b/lib/hashtable.h
index 2893e998..65931b67 100644
--- a/lib/hashtable.h
+++ b/lib/hashtable.h
@@ -90,6 +90,7 @@
  *			deallocation is not supported by mempools, so delete/remove
  *			will leak pool memory.
  *  HASH_AUTO_POOL=size	Create a pool of the given block size automatically.
+ *  HASH_ZERO_FILL	New entries should be initialized to all zeroes.
  *  HASH_TABLE_ALLOC	The hash table itself will be allocated and freed using
  *			the same allocation functions as the nodes instead of
  *			the default xmalloc().
@@ -335,6 +336,17 @@ static inline void P(table_free) (TAUC void *x) { xfree(x); }
 #define HASH_FN_BITS 32
 #endif
 
+#ifdef HASH_ZERO_FILL
+static inline void * P(new_bucket)(TAUC uns size)
+{
+  byte *buck = P(alloc)(TTC size);
+  bzero(buck, size);
+  return buck;
+}
+#else
+static inline void * P(new_bucket)(TAUC uns size) { return P(alloc)(TTC size); }
+#endif
+
 /* Now the operations */
 
 static void P(alloc_table) (TAU)
@@ -468,7 +480,7 @@ static P(node) * P(new) (TAC HASH_KEY_DECL)
 
   h0 = P(hash) (TTC HASH_KEY( ));
   h = h0 % T.hash_size;
-  b = P(alloc) (TTC sizeof(struct P(bucket)) + HASH_EXTRA_SIZE(HASH_KEY( )));
+  b = P(new_bucket) (TTC sizeof(struct P(bucket)) + HASH_EXTRA_SIZE(HASH_KEY( )));
   b->next = T.ht[h];
   T.ht[h] = b;
 #ifndef HASH_CONSERVE_SPACE
@@ -499,7 +511,7 @@ static P(node) * P(lookup) (TAC HASH_KEY_DECL)
 	return &b->n;
     }
 
-  b = P(alloc) (TTC sizeof(struct P(bucket)) + HASH_EXTRA_SIZE(HASH_KEY( )));
+  b = P(new_bucket) (TTC sizeof(struct P(bucket)) + HASH_EXTRA_SIZE(HASH_KEY( )));
   b->next = T.ht[h];
   T.ht[h] = b;
 #ifndef HASH_CONSERVE_SPACE
@@ -618,3 +630,4 @@ do {											\
 #undef HASH_WANT_REMOVE
 #undef HASH_TABLE_ALLOC
 #undef HASH_TABLE_DYNAMIC
+#undef HASH_ZERO_FILL
-- 
2.39.2