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       1                 :            : /* version.c --- Version handling.
       2                 :            :    Copyright (C) 2002-2012 Simon Josefsson
       3                 :            : 
       4                 :            :    This file is part of GNU Libidn.
       5                 :            : 
       6                 :            :    GNU Libidn is free software: you can redistribute it and/or
       7                 :            :    modify it under the terms of either:
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version.
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version.
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    GNU Libidn is distributed in the hope that it will be useful,
      22                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>. */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include "config.h"
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include "stringprep.h"
      35                 :            : 
      36                 :            : #include <string.h> /* for strverscmp */
      37                 :            : 
      38                 :            : /**
      39                 :            :  * stringprep_check_version:
      40                 :            :  * @req_version: Required version number, or NULL.
      41                 :            :  *
      42                 :            :  * Check that the version of the library is at minimum the requested one
      43                 :            :  * and return the version string; return NULL if the condition is not
      44                 :            :  * satisfied.  If a NULL is passed to this function, no check is done,
      45                 :            :  * but the version string is simply returned.
      46                 :            :  *
      47                 :            :  * See %STRINGPREP_VERSION for a suitable @req_version string.
      48                 :            :  *
      49                 :            :  * Return value: Version string of run-time library, or NULL if the
      50                 :            :  * run-time library does not meet the required version number.
      51                 :            :  */
      52                 :            : const char *
      53                 :          4 : stringprep_check_version (const char *req_version)
      54                 :            : {
      55 [ +  + ][ +  + ]:          4 :   if (!req_version || strverscmp (req_version, STRINGPREP_VERSION) <= 0)
      56                 :          3 :     return STRINGPREP_VERSION;
      57                 :            : 
      58                 :          4 :   return NULL;
      59                 :            : }