parse_certificates
xcs = parse_certificates(buf, len, num);
br_x509_certificate * parse_certificates(unsigned char *, size_t, size_t *);
xcs = parse_certificates(__DECONST(unsigned char *, VERIFY_CERTS_STR),
xcs = parse_certificates(buf, len, &num);
xcs = parse_certificates(buf, len, &num);