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glibc  2.9
nis_domain_of_r.c
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00001 /* Copyright (c) 1997, 2004, 2006 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <string.h>
00022 #include <rpcsvc/nis.h>
00023 
00024 nis_name
00025 nis_domain_of_r (const_nis_name name, char *buffer, size_t buflen)
00026 {
00027   char *cptr;
00028   size_t cptr_len;
00029 
00030   if (buffer == NULL)
00031     {
00032     erange:
00033       __set_errno (ERANGE);
00034       return NULL;
00035     }
00036 
00037   buffer[0] = '\0';
00038 
00039   cptr = strchr (name, '.');
00040 
00041   if (cptr == NULL)
00042     return buffer;
00043 
00044   ++cptr;
00045   cptr_len = strlen (cptr);
00046 
00047   if (cptr_len == 0)
00048     {
00049       if (buflen < 2)
00050        goto erange;
00051       return strcpy (buffer, ".");
00052     }
00053 
00054   if (__builtin_expect (cptr_len >= buflen, 0))
00055     {
00056       __set_errno (ERANGE);
00057       return NULL;
00058     }
00059 
00060   return memcpy (buffer, cptr, cptr_len + 1);
00061 }
00062 libnsl_hidden_def (nis_domain_of_r)