nss/valid_list_field.c

   1 /* Copyright (C) 2015-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <nss.h>
  19 #include <stdbool.h>
  20 #include <string.h>
  21
  22 static const char invalid_characters[] = NSS_INVALID_FIELD_CHARACTERS ",";
  23
  24 /* Check that all list members match the field syntax requirements and
  25    do not contain the character ','.  */
  26 _Bool
  27 __nss_valid_list_field (char **list)
  28 {
  29   if (list == NULL)
  30     return true;
  31   for (; *list != NULL; ++list)
  32     if (strpbrk (*list, invalid_characters) != NULL)
  33       return false;
  34   return true;
  35 }