memcmp.c

wm PNE 3.3 source code, running at more than vxworks6.x version.

/* $Header: /usr/cvsroot/target/src/wrn/wm/common/lib/memcmp.c,v 1.3 2003/01/16 18:18:56 josh Exp $ */

/*
 * Copyright (C) 1999-2005 Wind River Systems, Inc.
 * All rights reserved.  Provided under license only.
 * Distribution or other use of this software is only
 * permitted pursuant to the terms of a license agreement
 * from Wind River Systems (and is otherwise prohibited).
 * Refer to that license agreement for terms of use.
 */


/****************************************************************************
 *  Copyright 1998 Integrated Systems, Inc.
 *  All rights reserved.
 ****************************************************************************/

/*
 * $Log: memcmp.c,v $
 * Revision 1.3  2003/01/16 18:18:56  josh
 * directory structure shifting
 *
 * Revision 1.2  2001/11/06 22:15:52  tneale
 * Fixed for newest file layout
 *
 * Revision 1.1.1.1  2001/11/05 17:48:39  tneale
 * Tornado shuffle
 *
 * Revision 1.5  2001/01/19 22:21:31  paul
 * Update copyright.
 *
 * Revision 1.4  2000/03/17 00:16:54  meister
 * Update copyright message
 *
 * Revision 1.3  1999/04/09 20:33:47  wes
 * re-constify.  let's see what, if anything, blows up
 *
 * Revision 1.2  1998/07/04 00:29:23  sra
 * Remove "const" tags, more trouble than they are worth.
 *
 * Revision 1.1  1998/07/03 20:19:16  sra
 * Add etc_memcmp().
 *
 */

/* [clearcase]
modification history
-------------------
01b,20apr05,job  update copyright notices
01a,11dec03,job  fix copyright statements
*/


#include <wrn/wm/common/config.h>
#include <wrn/wm/common/stdf.h>
#include <wrn/wm/common/glue.h>

/*
 * Portable implementation of ISO C memcmp() function for platforms
 * that don't have it or have a broken version.
 *
 * ISO C clearly states that memcmp() compares unsigned characters
 * (each byte to be considered in the range 0..255), but a number
 * of implementations seem to get this wrong, probably for historical
 * reasons.
 */

int
  etc_memcmp(const void *v1, const void *v2, size_t len)
{
  unsigned const char *b1 = v1, *b2 = v2;
  int result = 0;

  while (len-- > 0)
    if ((result = (*b1++) - (*b2++)) != 0)
      break;

  return result;
}