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       1                 :            : /*
       2                 :            :  * Copyright (C) 2000-2012 Free Software Foundation, Inc.
       3                 :            :  *
       4                 :            :  * This file is part of LIBTASN1.
       5                 :            :  *
       6                 :            :  * The LIBTASN1 library is free software; you can redistribute it
       7                 :            :  * and/or modify it under the terms of the GNU Lesser General Public
       8                 :            :  * License as published by the Free Software Foundation; either
       9                 :            :  * version 2.1 of the License, or (at your option) any later version.
      10                 :            :  *
      11                 :            :  * This library is distributed in the hope that it will be useful, but
      12                 :            :  * WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14                 :            :  * Lesser General Public License for more details.
      15                 :            :  *
      16                 :            :  * You should have received a copy of the GNU Lesser General Public
      17                 :            :  * License along with this library; if not, write to the Free Software
      18                 :            :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
      19                 :            :  * 02110-1301, USA
      20                 :            :  */
      21                 :            : 
      22                 :            : #ifdef HAVE_CONFIG_H
      23                 :            : #include <config.h>
      24                 :            : #endif
      25                 :            : 
      26                 :            : #include <string.h>               /* for strverscmp */
      27                 :            : 
      28                 :            : #include "libtasn1.h"
      29                 :            : 
      30                 :            : /**
      31                 :            :  * asn1_check_version:
      32                 :            :  * @req_version: Required version number, or %NULL.
      33                 :            :  *
      34                 :            :  * Check that the version of the library is at minimum the
      35                 :            :  * requested one and return the version string; return %NULL if the
      36                 :            :  * condition is not satisfied.  If a %NULL is passed to this function,
      37                 :            :  * no check is done, but the version string is simply returned.
      38                 :            :  *
      39                 :            :  * See %ASN1_VERSION for a suitable @req_version string.
      40                 :            :  *
      41                 :            :  * Returns: Version string of run-time library, or %NULL if the
      42                 :            :  *   run-time library does not meet the required version number.
      43                 :            :  */
      44                 :            : const char *
      45                 :          3 : asn1_check_version (const char *req_version)
      46                 :            : {
      47 [ +  - ][ +  - ]:          3 :   if (!req_version || strverscmp (req_version, ASN1_VERSION) <= 0)
      48                 :          3 :     return ASN1_VERSION;
      49                 :            : 
      50                 :          3 :   return NULL;
      51                 :            : }