X509_LOOKUP_add_dir
if (!X509_LOOKUP_add_dir(lookup, CApath, X509_FILETYPE_PEM)) {
X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
if (!X509_LOOKUP_add_dir(lookup, crl_config.capath,
X509_LOOKUP_add_dir(lookup, NULL,
i = X509_LOOKUP_add_dir(lookup, ca_path, X509_FILETYPE_PEM);
if (!X509_LOOKUP_add_dir(lookup, verify_config.CApath,
X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
if (X509_LOOKUP_add_dir(lookup, path, X509_FILETYPE_PEM) != 1)
X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);