nis/nis_domain_of_r.c

   1 /* Copyright (c) 1997, 2004, 2006 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <string.h>
  22 #include <rpcsvc/nis.h>
  23
  24 nis_name
  25 nis_domain_of_r (const_nis_name name, char *buffer, size_t buflen)
  26 {
  27   char *cptr;
  28   size_t cptr_len;
  29
  30   if (buffer == NULL)
  31     {
  32     erange:
  33       __set_errno (ERANGE);
  34       return NULL;
  35     }
  36
  37   buffer[0] = '\0';
  38
  39   cptr = strchr (name, '.');
  40
  41   if (cptr == NULL)
  42     return buffer;
  43
  44   ++cptr;
  45   cptr_len = strlen (cptr);
  46
  47   if (cptr_len == 0)
  48     {
  49       if (buflen < 2)
  50         goto erange;
  51       return strcpy (buffer, ".");
  52     }
  53
  54   if (__builtin_expect (cptr_len >= buflen, 0))
  55     {
  56       __set_errno (ERANGE);
  57       return NULL;
  58     }
  59
  60   return memcpy (buffer, cptr, cptr_len + 1);
  61 }
  62 libnsl_hidden_def (nis_domain_of_r)