expandname
arcn->nlen = expandname(arcn->name, sizeof(arcn->name),
arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
static size_t expandname(char *, size_t, char **, const char *, size_t);
arcn->nlen = cnt + expandname(dest,
arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
expand = expandname(nv->nv_name);