[PATCH 05 of 10 v3] libxl: expand the libxl_bitmap API a bit

[Dario Faggioli <raistlin@linux.it>]

# HG changeset patch
# User Dario Faggioli <raistlin@linux.it>
# Date 1341416323 -7200
# Node ID 516eb90ec5599c8d44a5a5c109db9d8bbdb6ed09
# Parent  cfdd6d53f3dd3c6aa325fe6d8a17e4089daafae5
libxl: expand the libxl_bitmap API a bit

By adding copying and *_is_full/*_is_empty facilities.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>

---
Changes from v2:
 * added an assert for equal sizes in libxl_bitmap_copy().

Changes from v1:
 * now libxl_is_full/empty return 1 if true and 0 if false,
   as logic (and as requested during review).

diff --git a/tools/libxl/libxl_utils.c b/tools/libxl/libxl_utils.c
--- a/tools/libxl/libxl_utils.c
+++ b/tools/libxl/libxl_utils.c
@@ -510,6 +510,36 @@ void libxl_bitmap_dispose(libxl_bitmap *
     free(map->map);
 }
 
+void libxl_bitmap_copy(libxl_ctx *ctx, libxl_bitmap *dptr,
+                       const libxl_bitmap *sptr)
+{
+    int sz;
+
+    assert(dptr->size == sptr->size);
+    sz = dptr->size = sptr->size;
+    memcpy(dptr->map, sptr->map, sz * sizeof(*dptr->map));
+}
+
+int libxl_bitmap_is_full(const libxl_bitmap *bitmap)
+{
+    int i;
+
+    for (i = 0; i < bitmap->size; i++)
+        if (bitmap->map[i] != (uint8_t)-1)
+            return 0;
+   return 1;
+}
+
+int libxl_bitmap_is_empty(const libxl_bitmap *bitmap)
+{
+    int i;
+
+    for (i = 0; i < bitmap->size; i++)
+        if (bitmap->map[i])
+            return 0;
+    return 1;
+}
+
 int libxl_bitmap_test(const libxl_bitmap *bitmap, int bit)
 {
     if (bit >= bitmap->size * 8)
diff --git a/tools/libxl/libxl_utils.h b/tools/libxl/libxl_utils.h
--- a/tools/libxl/libxl_utils.h
+++ b/tools/libxl/libxl_utils.h
@@ -66,6 +66,10 @@ int libxl_vdev_to_device_disk(libxl_ctx 
 int libxl_bitmap_alloc(libxl_ctx *ctx, libxl_bitmap *bitmap, int n_bits);
     /* Allocated bimap is from malloc, libxl_bitmap_dispose() to be
      * called by the application when done. */
+void libxl_bitmap_copy(libxl_ctx *ctx, libxl_bitmap *dptr,
+                       const libxl_bitmap *sptr);
+int libxl_bitmap_is_full(const libxl_bitmap *bitmap);
+int libxl_bitmap_is_empty(const libxl_bitmap *bitmap);
 int libxl_bitmap_test(const libxl_bitmap *bitmap, int bit);
 void libxl_bitmap_set(libxl_bitmap *bitmap, int bit);
 void libxl_bitmap_reset(libxl_bitmap *bitmap, int bit);