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annotate lib/getgroups.c @ 8045:7dcf8a1f2f5e

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* lib/regex.h (_Restrict_): Renamed from __restrict, to avoid a circularity problem with HP-UX ia64 reported by Bob Proulx in <http://lists.gnu.org/archive/html/bug-gnulib/2007-01/msg00394.html>. All uses changed. (_Restrict_arr_): Renamed from __restrict_arr, for similar reasons. All uses changed. * lib/regcomp.c, lib/regexec.c: Change all uses from __restrict to _Restrict_. * lib/regexec.c (regexec): Declare pmatch with _Restrict_arr_, so that the parameter matches the prototype.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 29 Jan 2007 00:37:14 +0000
parents 8a1a9361108c
children bbbbbf4cd1c5
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1 /* provide consistent interface to getgroups for systems that don't allow N==0
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3 Copyright (C) 1996, 1999, 2003, 2006 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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a48fb0e98c8c *** empty log message ***
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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 Jim Meyering */
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20
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21 #include <config.h>
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22
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23 #include <stdio.h>
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24 #include <sys/types.h>
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25 #include <errno.h>
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26 #include <stdlib.h>
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27
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28 #include "xalloc.h"
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29
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30 /* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, 0) always fails.
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31 On other systems, it returns the number of supplemental groups for the
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32 process. This function handles that special case and lets the system-
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33 provided function handle all others. */
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34
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35 int
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36 getgroups (int n, GETGROUPS_T *group)
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37 {
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38 int n_groups;
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39 GETGROUPS_T *gbuf;
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40 int saved_errno;
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41
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42 #undef getgroups
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43
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44 if (n != 0)
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45 return getgroups (n, group);
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46
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47 n = 20;
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48 while (1)
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49 {
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50 /* No need to worry about address arithmetic overflow here,
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51 since the ancient systems that we're running on have low
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52 limits on the number of secondary groups. */
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53 gbuf = xmalloc (n * sizeof *gbuf);
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54 n_groups = getgroups (n, gbuf);
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55 if (n_groups < n)
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56 break;
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57 free (gbuf);
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58 n += 10;
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59 }
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60
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61 saved_errno = errno;
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62 free (gbuf);
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63 errno = saved_errno;
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64
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65 return n_groups;
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66 }