/*

 * Copyright (C) 2000-2025 Free Software Foundation, Inc.

 *

 * This file is part of LIBTASN1.

 *

 * The LIBTASN1 library is free software; you can redistribute it

 * and/or modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see

 * <https://www.gnu.org/licenses/>.

 */

#include <config.h>

#include <string.h>   /* for strverscmp */

#include "libtasn1.h"

/**

 * asn1_check_version:

 * @req_version: Required version number, or %NULL.

 *

 * Check that the version of the library is at minimum the

 * requested one and return the version string; return %NULL if the

 * condition is not satisfied.  If a %NULL is passed to this function,

 * no check is done, but the version string is simply returned.

 *

 * See %ASN1_VERSION for a suitable @req_version string.

 *

 * Returns: Version string of run-time library, or %NULL if the

 *   run-time library does not meet the required version number.

 */

const char *

asn1_check_version (const char *req_version)

{

  if (!req_version || strverscmp (req_version, ASN1_VERSION) <= 0)

    return ASN1_VERSION;

  return NULL;

}