strtounum
uintmax_t strtounum(const char * __restrict, uintmax_t, uintmax_t,
config.min_uid = strtounum(q, 0,
config.max_uid = strtounum(q, 0,
config.min_gid = strtounum(q, 0,
config.max_gid = strtounum(q, 0,
id = strtounum(name, 0, GID_MAX, &errstr);
id = strtounum(nptr, 0, maxval, &errstr);