custr_alloc_buf
if (custr_alloc_buf(&cus, buf, bufsize) != 0) {
if (custr_alloc_buf(&s.s_errstr, errout->nje_message,
int custr_alloc_buf(custr_t **, void *, size_t);
if (custr_alloc_buf(&s.s_errstr, errout->nje_message,