lib/minitasn1/version.c

   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 asn1_check_version (const char *req_version)
  46 {
  47   if (!req_version || strverscmp (req_version, ASN1_VERSION) <= 0)
  48     return ASN1_VERSION;
  49
  50   return NULL;
  51 }