libxl_json: Enable yajl_allow_trailing_garbage

This allows to parse a string that is not NUL-terminated. With that
option disabled, YAJL v2 would look ahead on completion to find out if
there is more to parse.

YAJL v1 doesn't have this behavior.

Any function that allocates a yajl_handle via this function either parse
a NUL-terminated string, or do provide proper length. So change the
default and allow garbage (like a different JSON document) after the end
of the data to parse.

This is important for the QMP client, as there could be more than one
message to parse, and YAJL would consider the next message to be garbage
and throw an error.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

diff --git a/tools/libxl/libxl_json.h b/tools/libxl/libxl_json.h
index af26e7885de894483fd533979ef6f3f6bffe74ed..260783bfdec0a2ca3296fcb6cc640d90c53783bf 100644 (file)
--- a/tools/libxl/libxl_json.h
+++ b/tools/libxl/libxl_json.h
@@ -50,7 +50,10 @@ static inline yajl_handle libxl__yajl_alloc(const yajl_callbacks *callbacks,
                                             yajl_alloc_funcs *allocFuncs,
                                             void *ctx)
 {
-    return yajl_alloc(callbacks, allocFuncs, ctx);
+    yajl_handle hand = yajl_alloc(callbacks, allocFuncs, ctx);
+    if (hand)
+        yajl_config(hand, yajl_allow_trailing_garbage, 1);
+    return hand;
 }
 
 static inline yajl_gen libxl_yajl_gen_alloc(const yajl_alloc_funcs *allocFuncs)