[Xen-devel] [PATCH v3 17/31] libxl_json: Enable yajl_allow_trailing_garbage

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

This allow to parse a string that is not NUL-terminated. With that
options 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 function that allocate 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 importand 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@xxxxxxxxxx>
---
 tools/libxl/libxl_json.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/libxl/libxl_json.h b/tools/libxl/libxl_json.h
index af26e7885d..260783bfde 100644
--- 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)
-- 
Anthony PERARD


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