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varlink_dispatch() is a simple wrapper around json_dispatch() that returns clean, standards-compliant InvalidParameter error back to clients, if the specified JSON cannot be parsed properly. For this json_dispatch() is extended to return the offending field's name. Because it already has quite a few parameters, I then renamed json_dispatch() to json_dispatch_full() and made json_dispatch() a wrapper around it that passes the new argument as NULL. While doing so I figured we should also get rid of the bad= argument in the short wrapper, since it's only used in the OCI code. To simplify the OCI code this adds a second wrapper oci_dispatch() around json_dispatch_full(), that fills in bad= the way we want. Net result: instead of one json_dispatch() call there are now: 1. json_dispatch_full() for the fully feature mother of all dispathers. 2. json_dispatch() for the simpler version that you want to use most of the time. 3. varlink_dispatch() that generates nice Varlink errors 4. oci_dispatch() that does the OCI specific error handling And that's all there is.