libc/string/memcmp.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program 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
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <string.h> /* size_t */
  21
  22 int memcmp (const void *cs, const void *ct, size_t count)
  23 {
  24         const unsigned char *su1, *su2;
  25         signed char res = 0;
  26
  27         for (su1 = cs, su2 = ct; 0 < count; ++ su1, ++ su2, count --)
  28                 if ((res = *su1 - *su2) != 0)
  29                         break;
  30
  31         return res;
  32 }