Function lua_cjson_encode

engine/script/src/luacjson/lua_cjson.c:975–1011

The major difference between this function and the internal cjson json_encode function is that we don't use the config object created by cjson. Instead we initialize and create a default config here to avoid passing the config as a user data object. Also, we return the generated string, and let the caller delete it

// a user data object.
// Also, we return the generated string, and let the caller delete it
int lua_cjson_encode(lua_State *l, int index, int options_index,
                     char** json_str, size_t* json_length)
{
    json_config_t cfg;
    strbuf_t local_encode_buf;
    strbuf_t *encode_buf;

    json_initialize_config(l, options_index, &cfg, DEFAULT_ENCODE_KEEP_BUFFER, 1, 0, 0);
    if (!cfg.encode_keep_buffer) {
        /* Use private buffer */
        encode_buf = &local_encode_buf;
        strbuf_init(encode_buf, 0);
    } else {
        /* Reuse existing buffer */
        encode_buf = &cfg.encode_buf;
        strbuf_reset(encode_buf);
    }

    lua_pushvalue(l, index); // make sure the value to encode is on top of the stack
    json_append_data(l, &cfg, 0, encode_buf);
    lua_pop(l, 1); // pop it again

    // DEFOLD: We store away the values
    int len;
    *json_str = strbuf_string(encode_buf, &len);
    *json_length = (size_t)len;

    strbuf_ensure_null(encode_buf);

    // DEFOLD: The caller will have to free this buffer
    encode_buf->buf = 0;

    if (!cfg.encode_keep_buffer)
        strbuf_free(encode_buf);

    return 1;
}

// END DEFOLD