json_object_from_file cannot accept max_depth

[minaguib]

If I currently want to parse a json file while increasing the maximum nesting depth, I'm forced to either:

• Patch JSON_TOKENER_DEFAULT_DEPTH at json-c compile time
• Copy the entire body of json_object_from_file() into my own application , then adjust its internals to manually create a tokener with json_tokener_parse_ex(depth) and use it instead of the vanilla json_tokener_parse() used in it.

I propose, and if you agree, would be happy to submit a patch that:

• Creates a new public function json_object_from_file_ex(const char filename, struct json_tokener tok, enum json_tokener_error *error) - this will have the bulk of the current json_object_from_file() code but will allow an external consumer to supply their own tokener as well as retrieve parsing error code
• Update existing json_object_from_file(const char *filename) to be a very lightweight wrapper around the new json_object_from_file_ex() - maintaining 100% signature and behavior

[dota17]

The public function json_object_from_file_ex() and corresponding testcase have been created in commit baed998. this issue and #166 could be closed. @hawicz

[hawicz]

json_object_from_fd_ex() actually, but yes, let's close this now.