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       1                 :            : /* version.c - implementation of version checking functions
       2                 :            :    Copyright (C) 2011 Simon Josefsson
       3                 :            : 
       4                 :            :    This program is free software: you can redistribute it and/or modify
       5                 :            :    it under the terms of the GNU General Public License as published by
       6                 :            :    the Free Software Foundation, either version 3 of the License, or
       7                 :            :    (at your option) any later version.
       8                 :            : 
       9                 :            :    This program is distributed in the hope that it will be useful,
      10                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      11                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12                 :            :    GNU General Public License for more details.
      13                 :            : 
      14                 :            :    You should have received a copy of the GNU General Public License
      15                 :            :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      16                 :            : */
      17                 :            : 
      18                 :            : #include <config.h>
      19                 :            : 
      20                 :            : #include "idn2.h"
      21                 :            : 
      22                 :            : #include <string.h>               /* strverscmp */
      23                 :            : 
      24                 :            : /**
      25                 :            :  * idn2_check_version:
      26                 :            :  * @req_version: version string to compare with, or NULL.
      27                 :            :  *
      28                 :            :  * Check IDN2 library version.  This function can also be used to read
      29                 :            :  * out the version of the library code used.  See %IDN2_VERSION for a
      30                 :            :  * suitable @req_version string, it corresponds to the idn2.h header
      31                 :            :  * file version.  Normally these two version numbers match, but if you
      32                 :            :  * are using an application built against an older libidn2 with a
      33                 :            :  * newer libidn2 shared library they will be different.
      34                 :            :  *
      35                 :            :  * Return value: Check that the version of the library is at
      36                 :            :  *   minimum the one given as a string in @req_version and return the
      37                 :            :  *   actual version string of the library; return NULL if the
      38                 :            :  *   condition is not met.  If NULL is passed to this function no
      39                 :            :  *   check is done and only the version string is returned.
      40                 :            :  **/
      41                 :            : const char *
      42                 :          3 : idn2_check_version (const char *req_version)
      43                 :            : {
      44 [ +  + ][ +  + ]:          3 :   if (!req_version || strverscmp (req_version, IDN2_VERSION) <= 0)
      45                 :          2 :     return IDN2_VERSION;
      46                 :            : 
      47                 :          3 :   return NULL;
      48                 :            : }