[PATCH 1/3] libxl: introduce libxl__json_array_count

[Wei Liu <wei.liu2@citrix.com>]

It returns the number of elements in a json array.

It will be used later.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
 tools/libxl/libxl_internal.h |  1 +
 tools/libxl/libxl_json.c     | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index ae16c25..38ec54d 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -1979,6 +1979,7 @@ _hidden int libxl__json_object_append_to(libxl__gc *gc_opt,
                                          libxl__yajl_ctx *ctx);
 _hidden libxl__json_object *libxl__json_array_get(const libxl__json_object *o,
                                                   int i);
+_hidden unsigned int libxl__json_array_count(const libxl__json_object *o);
 _hidden
 libxl__json_map_node *libxl__json_map_node_get(const libxl__json_object *o,
                                                int i);
diff --git a/tools/libxl/libxl_json.c b/tools/libxl/libxl_json.c
index b60ae2b..3b744fb 100644
--- a/tools/libxl/libxl_json.c
+++ b/tools/libxl/libxl_json.c
@@ -546,6 +546,17 @@ void libxl__json_object_free(libxl__gc *gc, libxl__json_object *obj)
     free(obj);
 }
 
+unsigned int libxl__json_array_count(const libxl__json_object *o)
+{
+    flexarray_t *array = NULL;
+
+    assert(libxl__json_object_is_array(o));
+    array = libxl__json_object_get_array(o);
+    assert(array);
+
+    return array->count;
+}
+
 libxl__json_object *libxl__json_array_get(const libxl__json_object *o, int i)
 {
     flexarray_t *array = NULL;
-- 
2.1.4


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