gonzui: t2ex/bsd_source/lib/libc/src

    1: /*      $OpenBSD: bcmp.c,v 1.9 2008/03/19 03:00:23 ray Exp $ */
    2: 
    3: /*
    4:  * Copyright (c) 1987 Regents of the University of California.
    5:  * All rights reserved.
    6:  *
    7:  * Redistribution and use in source and binary forms, with or without
    8:  * modification, are permitted provided that the following conditions
    9:  * are met:
   10:  * 1. Redistributions of source code must retain the above copyright
   11:  *    notice, this list of conditions and the following disclaimer.
   12:  * 2. Redistributions in binary form must reproduce the above copyright
   13:  *    notice, this list of conditions and the following disclaimer in the
   14:  *    documentation and/or other materials provided with the distribution.
   15:  * 3. Neither the name of the University nor the names of its contributors
   16:  *    may be used to endorse or promote products derived from this software
   17:  *    without specific prior written permission.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  */
   31: 
   32: #if !defined(_KERNEL) && !defined(_STANDALONE)
   33: #include <string.h>
   34: #else
   35: #include <lib/libkern/libkern.h>
   36: #endif
   37: 
   38: /*
   39:  * bcmp -- vax cmpc3 instruction
   40:  */
   41: int
   42: bcmp(const void *b1, const void *b2, size_t length)
   43: {
   44:         char *p1, *p2;
   45: 
   46:         if (length == 0)
   47:                 return (0);
   48:         p1 = (char *)b1;
   49:         p2 = (char *)b2;
   50:         do
   51:                 if (*p1++ != *p2++)
   52:                         return (1);
   53:         while (--length);
   54:         return (0);
   55: }