[sr-dev] [kamailio/kamailio] json: add get_object API and fix str init (5fe8618)

[Daniel-Constantin Mierla]

Looking at the code I think it is better to change the prototype of:

```
str _json_extract_field(struct json_object *json_obj, char *json_name)
```

to:

```
int _json_extract_field(struct json_object *json_obj, char *json_name, str *val)
```

Now it returns a variable declared on the stack, which could work with recent compilers, being returned by value. `str` itself is not a large structure, but returning structure values is not recommended in C, code analyzers complain about (same for passing a structure value as parameter -- it is recommended to use pointers).

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