util: hash: Add new constructor 'virHashNew'

Add a simpler constructor for hash tables which specifically does not
require specifying the initial hash size and uses simpler freeing
function.

The initial hash table size usually is not important as the hash table
is growing when it reaches certain number of entries in one bucket.
Additionally many callers pass in a random small number for ad-hoc table
use so using a central one will simplify things.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
ACKed-by: NEric Blake <eblake@redhat.com>

src/libvirt_private.syms

@@ -2071,6 +2071,7 @@ virHashForEach;
 virHashFree;
 virHashGetItems;
 virHashLookup;
+virHashNew;
 virHashRemoveAll;
 virHashRemoveEntry;
 virHashRemoveSet;

src/util/virhash.c

@@ -169,6 +169,27 @@ virHashTablePtr virHashCreateFull(ssize_t size,
 }
 
 
+/**
+ * virHashNew:
+ * @dataFree: callback to free data
+ *
+ * Create a new virHashTablePtr.
+ *
+ * Returns the newly created object, or NULL if an error occurred.
+ */
+virHashTablePtr
+virHashNew(virHashDataFreeSimple dataFree)
+{
+    return virHashCreateFull(32,
+                             NULL,
+                             dataFree,
+                             virHashStrCode,
+                             virHashStrEqual,
+                             virHashStrCopy,
+                             virHashStrFree);
+}
+
+
 /**
  * virHashCreate:
  * @size: the size of the hash table

src/util/virhash.h

@@ -107,6 +107,7 @@ typedef void (*virHashKeyFree)(void *name);
 /*
  * Constructor and destructor.
  */
+virHashTablePtr virHashNew(virHashDataFreeSimple dataFree);
 virHashTablePtr virHashCreate(ssize_t size,
                               virHashDataFree dataFree);
 virHashAtomicPtr virHashAtomicNew(ssize_t size,