lib/util/util_id.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Helper routines for uid and gid arrays
   5
   6    Copyright (C) Guenther Deschner 2009
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /****************************************************************************
  25  Add a gid to an array of gids if it's not already there.
  26 ****************************************************************************/
  27
  28 bool add_gid_to_array_unique(TALLOC_CTX *mem_ctx, gid_t gid,
  29                              gid_t **gids, size_t *num_gids)
  30 {
  31         int i;
  32
  33         if ((*num_gids != 0) && (*gids == NULL)) {
  34                 /*
  35                  * A former call to this routine has failed to allocate memory
  36                  */
  37                 return false;
  38         }
  39
  40         for (i=0; i<*num_gids; i++) {
  41                 if ((*gids)[i] == gid) {
  42                         return true;
  43                 }
  44         }
  45
  46         *gids = talloc_realloc(mem_ctx, *gids, gid_t, *num_gids+1);
  47         if (*gids == NULL) {
  48                 *num_gids = 0;
  49                 return false;
  50         }
  51
  52         (*gids)[*num_gids] = gid;
  53         *num_gids += 1;
  54         return true;
  55 }
  56
  57 /****************************************************************************
  58  Add a uid to an array of uids if it's not already there.
  59 ****************************************************************************/
  60
  61 bool add_uid_to_array_unique(TALLOC_CTX *mem_ctx, uid_t uid,
  62                              uid_t **uids, size_t *num_uids)
  63 {
  64         int i;
  65
  66         if ((*num_uids != 0) && (*uids == NULL)) {
  67                 /*
  68                  * A former call to this routine has failed to allocate memory
  69                  */
  70                 return false;
  71         }
  72
  73         for (i=0; i<*num_uids; i++) {
  74                 if ((*uids)[i] == uid) {
  75                         return true;
  76                 }
  77         }
  78
  79         *uids = talloc_realloc(mem_ctx, *uids, uid_t, *num_uids+1);
  80         if (*uids == NULL) {
  81                 *num_uids = 0;
  82                 return false;
  83         }
  84
  85         (*uids)[*num_uids] = uid;
  86         *num_uids += 1;
  87         return true;
  88 }