Skip to content
Snippets Groups Projects
Select Git revision
  • benchmark-tools
  • postgres-lambda
  • master default
  • REL9_4_25
  • REL9_5_20
  • REL9_6_16
  • REL_10_11
  • REL_11_6
  • REL_12_1
  • REL_12_0
  • REL_12_RC1
  • REL_12_BETA4
  • REL9_4_24
  • REL9_5_19
  • REL9_6_15
  • REL_10_10
  • REL_11_5
  • REL_12_BETA3
  • REL9_4_23
  • REL9_5_18
  • REL9_6_14
  • REL_10_9
  • REL_11_4
23 results

memcmp.c

Blame
  • memcmp.c 2.31 KiB
    /*-------------------------------------------------------------------------
     *
     * memcmp.c
     *	  compares memory bytes
     *
     * Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
     *
     *
     * IDENTIFICATION
     *	  src/port/memcmp.c
     *
     * This file was taken from NetBSD and is used by SunOS because memcmp
     * on that platform does not properly compare negative bytes. The
     * NetBSD copyright terms follow.
     */
    
    /*-
     * Copyright (c) 1990, 1993
     *	The Regents of the University of California.  All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * Chris Torek.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *	  notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *	  notice, this list of conditions and the following disclaimer in the
     *	  documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *	  may be used to endorse or promote products derived from this software
     *	  without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.	IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include "c.h"
    
    
    /*
     * Compare memory regions.
     */
    int
    memcmp(const void *s1, const void *s2, size_t n)
    {
    	if (n != 0)
    	{
    		const unsigned char *p1 = s1,
    				   *p2 = s2;
    
    		do
    		{
    			if (*p1++ != *p2++)
    				return (*--p1 - *--p2);
    		} while (--n != 0);
    	}
    	return 0;
    }