lib/acl_entries.c

   1 /* Return the number of entries in an ACL.
   2
   3    Copyright (C) 2002-2003, 2005-2018 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  17
  18    Written by Paul Eggert and Andreas Gruenbacher.  */
  19
  20 #include <config.h>
  21
  22 #include "acl-internal.h"
  23
  24 /* This file assumes POSIX-draft like ACLs
  25    (Linux, FreeBSD, Mac OS X, IRIX, Tru64).  */
  26
  27 /* Return the number of entries in ACL.
  28    Return -1 and set errno upon failure to determine it.  */
  29
  30 int
  31 acl_entries (acl_t acl)
  32 {
  33   int count = 0;
  34
  35   if (acl != NULL)
  36     {
  37 #if HAVE_ACL_FIRST_ENTRY /* Linux, FreeBSD, Mac OS X */
  38 # if HAVE_ACL_TYPE_EXTENDED /* Mac OS X */
  39       /* acl_get_entry returns 0 when it successfully fetches an entry,
  40          and -1/EINVAL at the end.  */
  41       acl_entry_t ace;
  42       int got_one;
  43
  44       for (got_one = acl_get_entry (acl, ACL_FIRST_ENTRY, &ace);
  45            got_one >= 0;
  46            got_one = acl_get_entry (acl, ACL_NEXT_ENTRY, &ace))
  47         count++;
  48 # else /* Linux, FreeBSD */
  49       /* acl_get_entry returns 1 when it successfully fetches an entry,
  50          and 0 at the end.  */
  51       acl_entry_t ace;
  52       int got_one;
  53
  54       for (got_one = acl_get_entry (acl, ACL_FIRST_ENTRY, &ace);
  55            got_one > 0;
  56            got_one = acl_get_entry (acl, ACL_NEXT_ENTRY, &ace))
  57         count++;
  58       if (got_one < 0)
  59         return -1;
  60 # endif
  61 #else /* IRIX, Tru64 */
  62 # if HAVE_ACL_TO_SHORT_TEXT /* IRIX */
  63       /* Don't use acl_get_entry: it is undocumented.  */
  64       count = acl->acl_cnt;
  65 # endif
  66 # if HAVE_ACL_FREE_TEXT /* Tru64 */
  67       /* Don't use acl_get_entry: it takes only one argument and does not
  68          work.  */
  69       count = acl->acl_num;
  70 # endif
  71 #endif
  72     }
  73
  74   return count;
  75 }