bhnd_nv_ummin
limit = bhnd_nv_ummin(le32toh(hdr.size), limit);
buflen = bhnd_nv_ummin(sizeof(buf), limit - offset);
navail = bhnd_nv_ummin(buflen - bufpos, nleft);
nread = bhnd_nv_ummin(sizeof(buf) - buflen,
envp_len = bhnd_nv_ummin(sizeof(envp), io_size);
buflen = bhnd_nv_ummin(sizeof(buf), limit - offset);
navail = bhnd_nv_ummin(buflen - bufpos, nleft);
nread = bhnd_nv_ummin(sizeof(buf) - buflen,
nr = bhnd_nv_ummin(nread, sizeof(buf));
error = bhnd_nvram_parse_int(p, bhnd_nv_ummin(plen, 2),