Line data    Source code

       1             : /* version.c --- Version handling.
       2             :    Copyright (C) 2002-2020 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         368 : stringprep_check_version (const char *req_version)
      54             : {
      55         368 :   if (!req_version || strverscmp (req_version, STRINGPREP_VERSION) <= 0)
      56         174 :     return STRINGPREP_VERSION;
      57             : 
      58         194 :   return NULL;
      59             : }