int bufio_chain_append(bufio_chain *bc, void *buf, size_t len) {
bufio_chain_entry *e = calloc(1, sizeof(*e));
if (e != NULL) return -1;
int bufio_chain_append(bufio_chain *bc, void *buf, size_t len) {
bufio_chain_entry *e = calloc(1, sizeof(*e));
if (e != NULL) return -1;