+
−/* check-version.h --- Check version string compatibility.
+
−   Copyright (C) 1998-2006, 2008-2011 Free Software Foundation, Inc.
+
−
+
−   This program is free software; you can redistribute it and/or modify
+
−   it under the terms of the GNU General Public License as published by
+
−   the Free Software Foundation; either version 2, or (at your option)
+
−   any later version.
+
−
+
−   This program is distributed in the hope that it will be useful,
+
−   but WITHOUT ANY WARRANTY; without even the implied warranty of
+
−   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+
−   GNU General Public License for more details.
+
−
+
−   You should have received a copy of the GNU General Public License
+
−   along with this program; if not, write to the Free Software Foundation,
+
−   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
−
+
−/* Written by Simon Josefsson.  This interface is influenced by
+
−   gcry_check_version from Werner Koch's Libgcrypt.  Paul Eggert
+
−   suggested the use of strverscmp to simplify implementation. */
+
−
+
−#include <config.h>
+
−
+
−#include <stddef.h>
+
−#include <string.h>
+
−
+
−/* Get specification. */
+
−#include "check-version.h"
+
−
+
−/* Check that the version of the library (i.e., the CPP symbol VERSION)
+
− * is at minimum the requested one in REQ_VERSION (typically found in
+
− * a header file) and return the version string.  Return NULL if the
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− * condition is not satisfied.  If a NULL is passed to this function,
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− * no check is done, but the version string is simply returned.
+
− */
+
−const char *
+
−check_version (const char *req_version)
+
−{
+
−  if (!req_version || strverscmp (req_version, VERSION) <= 0)
+
−    return VERSION;
+
−
+
−  return NULL;
+
−}