Zbigniew Jędrzejewski-Szmek
6af868a229
The arg types==NULL has different meanings for different functions. Some functions like sd_bus_message_appendv() require a non-null param and treat "" as "no data". Other functions like sd_bus_skip() treat null as "process one item", while the convenience functions treat NULL the same as "". So I think it's reasonable to make the convenience functions handle NULL explicitly, separately from "". That way the logical separation of concerns is clearer, and e.g. sd_bus_message_appendv() handles all non-null strings, while e.g. sd_bus_call_methodv() doesn't look into the string at all. Behaviour is unchanged.
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