libxl: introduce flexarray_append_pair

Introduce flexarray_append_pair: a simple syntactic sugar to add a pair
of pointers to a flexarray, very useful when adding pairs of strings to
xenstore.

Replace flexarray_vappend calls (and one pair of flexarray_append)
with flexarray_append_pair calls when dealing with flexarrays that are
going to be used with libxl__xs_kvs_of_flexarray:

NULL is a valid pointer value in these cases while flexarray_vappend
uses NULL as vargs terminator, so the old code is buggy.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/tools/libxl/flexarray.h b/tools/libxl/flexarray.h
index 30b8a1766b..350fbf4a9c 100644
--- a/tools/libxl/flexarray.h
+++ b/tools/libxl/flexarray.h
@@ -28,6 +28,7 @@ _hidden void flexarray_free(flexarray_t *array);
 _hidden int flexarray_grow(flexarray_t *array, int extents);
 _hidden int flexarray_set(flexarray_t *array, unsigned int index, void *ptr);
 _hidden int flexarray_append(flexarray_t *array, void *ptr);
+_hidden int flexarray_append_pair(flexarray_t *array, void *ptr1, void *ptr2);
 _hidden int flexarray_vappend(flexarray_t *array, ...);
 _hidden int flexarray_get(flexarray_t *array, int index, void **ptr);