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/* check-version.h --- Check version string compatibility.
Copyright (C) 1998-2006, 2008-2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* 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
* condition is not satisfied. If a NULL is passed to this function,
* 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;
}
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