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annotate lib/check-version.c @ 10606:442a5ff4bcc1

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Reduce code duplication.
author Paolo Bonzini <bonzini@gnu.org>
date Thu, 09 Oct 2008 13:31:16 +0200
parents 8d80c477e0ad
children b5e42ef33b49
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1 /* check-version.h --- Check version string compatibility.
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2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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3 2008 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 2, or (at your option)
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8 any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 /* Written by Simon Josefsson. This interface is influenced by
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20 gcry_check_version from Werner Koch's Libgcrypt. Paul Eggert
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21 suggested the use of strverscmp to simplify implementation. */
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22
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23 #include <config.h>
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25 #include <stddef.h>
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26 #include <string.h>
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27
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28 /* Get specification. */
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29 #include "check-version.h"
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30
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31 /* Check that the version of the library (i.e., the CPP symbol VERSION)
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32 * is at minimum the requested one in REQ_VERSION (typically found in
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33 * a header file) and return the version string. Return NULL if the
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34 * condition is not satisfied. If a NULL is passed to this function,
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35 * no check is done, but the version string is simply returned.
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36 */
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37 const char *
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38 check_version (const char *req_version)
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39 {
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40 if (!req_version || strverscmp (req_version, VERSION) <= 0)
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41 return VERSION;
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42
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43 return NULL;
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44 }