---
lib/bitmap.c | 21 ++++++++++++++++++++-
lib/bitmap.h | 2 ++
2 files changed, 22 insertions(+), 1 deletions(-)
diff --git a/lib/bitmap.c b/lib/bitmap.c
index df3c4eb..76a667a 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2011 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -18,6 +18,25 @@
#include "bitmap.h"
#include <string.h>
+/* Allocates and returns a bitmap initialized to all-1-bits. */
+unsigned long *
+bitmap_allocate1(size_t n_bits)
+{
+ size_t n_bytes = bitmap_n_bytes(n_bits);
+ size_t n_longs = bitmap_n_longs(n_bits);
+ unsigned long *bitmap;
+
+ /* Allocate and initialize most of the bitmap. */
+ bitmap = xmalloc(n_bytes);
+ memset(bitmap, 0xff, n_bytes);
+
+ /* Ensure that the last "unsigned long" in the bitmap only has as many
+ * 1-bits as there actually should be. */
+ bitmap[n_longs - 1] = (1UL << (n_bits % BITMAP_ULONG_BITS)) - 1;
+
+ return bitmap;
+}
+
/* Sets 'count' consecutive bits in 'bitmap', starting at bit offset 'start',
* to 'value'. */
void
diff --git a/lib/bitmap.h b/lib/bitmap.h
index f6feff0..c76e45f 100644
--- a/lib/bitmap.h
+++ b/lib/bitmap.h
@@ -53,6 +53,8 @@ bitmap_allocate(size_t n_bits)
return xzalloc(bitmap_n_bytes(n_bits));
}
+unsigned long *bitmap_allocate1(size_t n_bits);
+
static inline unsigned long *
bitmap_clone(const unsigned long *bitmap, size_t n_bits)
{
--
1.7.4.4
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