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43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/* check-version.h --- Check version string compatibility.
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Copyright (C) 1998-2006, 2008-2015 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>. */
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/* Written by Simon Josefsson. This interface is influenced by
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gcry_check_version from Werner Koch's Libgcrypt. Paul Eggert
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suggested the use of strverscmp to simplify implementation. */
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#include <config.h>
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#include <stddef.h>
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#include <string.h>
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/* Get specification. */
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#include "check-version.h"
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/* Check that the version of the library (i.e., the CPP symbol VERSION)
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* is at minimum the requested one in REQ_VERSION (typically found in
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* 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.
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*/
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const char *
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check_version (const char *req_version)
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{
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if (!req_version || strverscmp (req_version, VERSION) <= 0)
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return VERSION;
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return NULL;
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}
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