bcmp.c

早期freebsd实现

/* Emulate bcmp using memcmp
   Copyright (C) 1991 Free Software Foundation, Inc.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */


/*

NAME

	bcmp -- compare two memory regions

SYNOPSIS

	int bcmp (char *from, char *to, int count)

DESCRIPTION

	Compare two memory regions and return zero if they are identical,
	non-zero otherwise.  If count is zero, return zero.

NOTES

	No guarantee is made about the non-zero returned value.  In
	particular, the results may be signficantly different than
	strcmp(), where the return value is guaranteed to be less than,
	equal to, or greater than zero, according to lexicographical
	sorting of the compared regions.

BUGS

*/


int
bcmp (from, to, count)
  char *from, *to;
  int count;
{
  int rtnval = 0;

  while (count-- > 0)
    {
      if (*from++ != *to++)
	{
	  rtnval = 1;
	  break;
	}
    }
  return (rtnval);
}