lib/minitasn1/version.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2004, 2006, 2007, 2008, 2009, 2010 Free
   3  * Software Foundation, Inc.
   4  *
   5  * This file is part of LIBTASN1.
   6  *
   7  * The LIBTASN1 library is free software; you can redistribute it
   8  * and/or modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #include <string.h>             /* for strverscmp */
  28
  29 #include "libtasn1.h"
  30
  31 /**
  32  * asn1_check_version:
  33  * @req_version: Required version number, or %NULL.
  34  *
  35  * Check that the version of the library is at minimum the
  36  * requested one and return the version string; return %NULL if the
  37  * condition is not satisfied.  If a %NULL is passed to this function,
  38  * no check is done, but the version string is simply returned.
  39  *
  40  * See %ASN1_VERSION for a suitable @req_version string.
  41  *
  42  * Returns: Version string of run-time library, or %NULL if the
  43  *   run-time library does not meet the required version number.
  44  */
  45 const char *
  46 asn1_check_version (const char *req_version)
  47 {
  48   if (!req_version || strverscmp (req_version, ASN1_VERSION) <= 0)
  49     return ASN1_VERSION;
  50
  51   return NULL;
  52 }