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annotate lib/check-version.c @ 18029:e4a13d95b503

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mgetgroups: port to strict OS X * doc/glibc-functions/getgrouplist.texi (getgrouplist): Document the getgrouplist problem. * lib/mgetgroups.c (getgrouplist_gids) [HAVE_GETGROUPLIST]: New macro. (mgetgroups): Use it. * m4/mgetgroups.m4 (gl_MGETGROUPS): Check for OS X signature for getgrouplist.
author Paul Eggert <eggert@cs.ucla.edu>
date Sun, 28 Jun 2015 23:43:35 -0700
parents ab58d4870664
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1 /* check-version.h --- Check version string compatibility.
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2 Copyright (C) 1998-2006, 2008-2015 Free Software Foundation, Inc.
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3
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4 This program is free software; you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 2, or (at your option)
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7 any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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14 You should have received a copy of the GNU General Public License
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15 along with this program; if not, see <http://www.gnu.org/licenses/>. */
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17 /* Written by Simon Josefsson. This interface is influenced by
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18 gcry_check_version from Werner Koch's Libgcrypt. Paul Eggert
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19 suggested the use of strverscmp to simplify implementation. */
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20
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21 #include <config.h>
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23 #include <stddef.h>
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24 #include <string.h>
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26 /* Get specification. */
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27 #include "check-version.h"
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29 /* Check that the version of the library (i.e., the CPP symbol VERSION)
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30 * is at minimum the requested one in REQ_VERSION (typically found in
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31 * a header file) and return the version string. Return NULL if the
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32 * condition is not satisfied. If a NULL is passed to this function,
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33 * no check is done, but the version string is simply returned.
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34 */
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35 const char *
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36 check_version (const char *req_version)
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37 {
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38 if (!req_version || strverscmp (req_version, VERSION) <= 0)
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39 return VERSION;
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41 return NULL;
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42 }