ofproto: Allow the use of the OpenFlow 1.4 protocol

[sliver-openvswitch.git] / lib / bitmap.c

diff --git a/lib/bitmap.c b/lib/bitmap.c
index d607526..51ad5bf 100644 (file)
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -17,6 +17,7 @@
 #include <config.h>
 #include "bitmap.h"
 #include <string.h>
+#include "util.h"
 
 /* Allocates and returns a bitmap initialized to all-1-bits. */
 unsigned long *
@@ -24,6 +25,7 @@ bitmap_allocate1(size_t n_bits)
 {
     size_t n_bytes = bitmap_n_bytes(n_bits);
     size_t n_longs = bitmap_n_longs(n_bits);
+    size_t r_bits = n_bits % BITMAP_ULONG_BITS;
     unsigned long *bitmap;
 
     /* Allocate and initialize most of the bitmap. */
@@ -32,7 +34,9 @@ bitmap_allocate1(size_t n_bits)
 
     /* 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;
+    if (r_bits) {
+        bitmap[n_longs - 1] = (1UL << r_bits) - 1;
+    }
 
     return bitmap;
 }
@@ -89,3 +93,18 @@ bitmap_scan(const unsigned long int *bitmap, size_t start, size_t end)
     }
     return i;
 }
+
+/* Returns the number of 1-bits in the 'n'-bit bitmap at 'bitmap'. */
+size_t
+bitmap_count1(const unsigned long int *bitmap, size_t n)
+{
+    size_t i;
+    size_t count = 0;
+
+    BUILD_ASSERT(ULONG_MAX <= UINT64_MAX);
+    for (i = 0; i < BITMAP_N_LONGS(n); i++) {
+        count += count_1bits(bitmap[i]);
+    }
+
+    return count;
+}