NPF_RULESET_MAP_PREF
return strncmp(name, NPF_RULESET_MAP_PREF,
sizeof(NPF_RULESET_MAP_PREF) - 1) == 0;
NPF_RULESET_MAP_PREF "`");
"prefixed with `" NPF_RULESET_MAP_PREF "`)");
const size_t preflen = sizeof(NPF_RULESET_MAP_PREF) - 1;
*natset = strncmp(name, NPF_RULESET_MAP_PREF, preflen) == 0;