X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fbitmap.c;h=df3c4ebca38b4c125e87228acfe4557e0c20a9bf;hb=5e4641a147c3e450a56b199b9066f1af75c2f779;hp=f021a7e585fcb595f29c4a6018ec9b9343bb07a9;hpb=34e63086edddcae06d7c1a4fa84fec0861e50758;p=openvswitch

diff --git a/lib/bitmap.c b/lib/bitmap.c
index f021a7e5..df3c4ebc 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008 Nicira Networks.
+ * Copyright (c) 2008, 2009 Nicira Networks.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,3 +53,20 @@ bitmap_equal(const unsigned long *a, const unsigned long *b, size_t n)
     }
     return true;
 }
+
+/* Scans 'bitmap' from bit offset 'start' to 'end', excluding 'end' itself.
+ * Returns the bit offset of the lowest-numbered bit set to 1, or 'end' if
+ * all of the bits are set to 0. */
+size_t
+bitmap_scan(const unsigned long int *bitmap, size_t start, size_t end)
+{
+    /* XXX slow */
+    size_t i;
+
+    for (i = start; i < end; i++) {
+        if (bitmap_is_set(bitmap, i)) {
+            break;
+        }
+    }
+    return i;
+}