confstr
size_t len = confstr(_CS_PATH, NULL, 0);
confstr(_CS_PATH, new = alloc(len + 1, APERM), len + 1);
size_t confstr(int, char *, size_t)
PROTO_DEPRECATED(confstr);
if ((slen = confstr(cp->value, NULL, 0)) == 0) {
confstr(cp->value, sval, slen);