纯C语言json解析，很好用

Very low footprint JSON parser written in portable ANSI C. * BSD licensed with no dependencies (i.e. just drop the C file into your project) * Never recurses or allocates more memory than it needs * Very simple API with operator sugar for C++ [](http://travis-ci.org/udp/json-parser) API --- json_value * json_parse (const json_char * json, size_t length); json_value * json_parse_ex (json_settings * settings, const json_char * json, size_t length, char * error); void json_value_free (json_value *); The `type` field of `json_value` is one of: * `json_object` (see `u.object.length`, `u.object.values[x].name`, `u.object.values[x].value`) * `json_array` (see `u.array.length`, `u.array.values`) * `json_integer` (see `u.integer`) * `json_double` (see `u.dbl`) * `json_string` (see `u.string.ptr`, `u.string.length`) * `json_boolean` (see `u.boolean`) * `json_null`