Add a virBitmapCopy API

Add an API allowing flags from one virBitmapPtr to be copied
into another instance.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

src/libvirt_private.syms

@@ -8,6 +8,7 @@
 # bitmap.h
 virBitmapAlloc;
 virBitmapClearBit;
+virBitmapCopy;
 virBitmapFree;
 virBitmapGetBit;
 virBitmapSetBit;

src/util/bitmap.c

@@ -93,6 +93,25 @@ void virBitmapFree(virBitmapPtr bitmap)
     }
 }
 
+
+int virBitmapCopy(virBitmapPtr dst, virBitmapPtr src)
+{
+    size_t sz;
+
+    if (dst->size != src->size) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    sz = (src->size + VIR_BITMAP_BITS_PER_UNIT - 1) /
+        VIR_BITMAP_BITS_PER_UNIT;
+
+    memcpy(dst->map, src->map, sz * sizeof(src->map[0]));
+
+    return 0;
+}
+
+
 /**
  * virBitmapSetBit:
  * @bitmap: Pointer to bitmap

src/util/bitmap.h

@@ -41,6 +41,12 @@ virBitmapPtr virBitmapAlloc(size_t size) ATTRIBUTE_RETURN_CHECK;
  */
 void virBitmapFree(virBitmapPtr bitmap);
 
+/*
+ * Copy all bits from @src to @dst. The bitmap sizes
+ * must be the same
+ */
+int virBitmapCopy(virBitmapPtr dst, virBitmapPtr src);
+
 /*
  * Set bit position @b in @bitmap
  */