branches/zip: Add a hash_table_clear() function to drop all elements that

have been added to it.

Approved by:	Marko

include/hash0hash.h

@@ -178,6 +178,15 @@ hash_get_nth_cell(
 				/* out: pointer to cell */
 	hash_table_t*	table,	/* in: hash table */
 	ulint		n);	/* in: cell index */
+
+/*****************************************************************
+Clears a hash table so that all the cells become empty again. */
+UNIV_INLINE
+void
+hash_table_clear(
+/*=============*/
+	hash_table_t*	table);	/* in/out: hash table */
+
 /*****************************************************************
 Returns the number of cells in a hash table. */
 UNIV_INLINE

include/hash0hash.ic

@@ -23,6 +23,18 @@ hash_get_nth_cell(
 	return(table->array + n);
 }
 
+/*****************************************************************
+Clears a hash table so that all the cells become empty again. */
+UNIV_INLINE
+void
+hash_table_clear(
+/*=============*/
+	hash_table_t*	table)	/* in/out: hash table */
+{
+	memset(table->array, 0x0,
+	       table->n_cells * sizeof(*table->array));
+}
+
 /*****************************************************************
 Returns the number of cells in a hash table. */
 UNIV_INLINE