src/openvpn/memcmp.c

   1 /* memcmp.c -- Replacement memcmp.c
   2  *
   3  * Useful on systems that don't have a working memcmp, such as SunOS
   4  * 4.1.3 and NeXT x86 OpenStep.
   5  *
   6  * Copyright (C) 2002 - 2003 Matthias Andree <matthias.andree@gmx.de>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or (at
  11  * your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program (see the file COPYING included with this
  20  * distribution); if not, write to the Free Software Foundation, Inc.,
  21  * 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  */
  23
  24 #include <string.h>
  25
  26 int
  27 memcmp (const void *s1, const void *s2, size_t n)
  28 {
  29         register unsigned const char *p1 = s1, *p2 = s2;
  30         int d;
  31
  32         if (n)
  33                 while (n-- > 0)
  34                   {
  35                           d = *p1++ - *p2++;
  36                           if (d != 0)
  37                                   return d;
  38                   }
  39         return 0;
  40 }