nis/nis_domain_of_r.c

   1 /* Copyright (c) 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <string.h>
  22 #include <rpcsvc/nis.h>
  23 #include <rpcsvc/nislib.h>
  24
  25 nis_name
  26 nis_domain_of_r (const_nis_name name, char *buffer, size_t buflen)
  27 {
  28   char *cptr;
  29   size_t cptr_len;
  30
  31   if (buffer == NULL)
  32     {
  33       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     strcpy (buffer, ".");
  49   else if (cptr_len >= buflen)
  50     {
  51       errno = ERANGE;
  52       return NULL;
  53     }
  54   else
  55     memcpy (buffer, cptr, cptr_len + 1);
  56
  57   return buffer;
  58 }