nis/nis_domain_of_r.c

   1 /* Copyright (c) 1997-2013 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <rpcsvc/nis.h>
  22
  23 nis_name
  24 nis_domain_of_r (const_nis_name name, char *buffer, size_t buflen)
  25 {
  26   char *cptr;
  27   size_t cptr_len;
  28
  29   if (buffer == NULL)
  30     {
  31     erange:
  32       __set_errno (ERANGE);
  33       return NULL;
  34     }
  35
  36   buffer[0] = '\0';
  37
  38   cptr = strchr (name, '.');
  39
  40   if (cptr == NULL)
  41     return buffer;
  42
  43   ++cptr;
  44   cptr_len = strlen (cptr);
  45
  46   if (cptr_len == 0)
  47     {
  48       if (buflen < 2)
  49         goto erange;
  50       return strcpy (buffer, ".");
  51     }
  52
  53   if (__builtin_expect (cptr_len >= buflen, 0))
  54     {
  55       __set_errno (ERANGE);
  56       return NULL;
  57     }
  58
  59   return memcpy (buffer, cptr, cptr_len + 1);
  60 }
  61 libnsl_hidden_def (nis_domain_of_r)