rapi_fmt_flowspec parameters

specp: This parameter is a pointer to the flowspec to be formatted. If it is NULL, this function returns without performing any formatting.
buffer: This is a pointer to the user-supplied buffer into which the formatted output will be placed. If the buffer is too small to contain the output, then the formatted output is truncated. If this parameter is NULL, this function returns without performing any formatting.
length: This is the length of the buffer pointed to with the buffer parameter. If this parameter is 0, this function returns without performing any formatting.