/* Copyright (C) 1991, 1996, 1997, 2003 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library 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   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <string.h>#include "memcopy.h"#undef strncmp/* Compare no more than N characters of S1 and S2,   returning less than, equal to or greater than zero   if S1 is lexicographically less than, equal to or   greater than S2.  */intstrncmp (s1, s2, n)     const char *s1;     const char *s2;     size_t n;{  unsigned reg_char c1 = '\0';  unsigned reg_char c2 = '\0';  if (n >= 4)    {      size_t n4 = n >> 2;      do	{	  c1 = (unsigned char) *s1++;	  c2 = (unsigned char) *s2++;	  if (c1 == '\0' || c1 != c2)	    return c1 - c2;	  c1 = (unsigned char) *s1++;	  c2 = (unsigned char) *s2++;	  if (c1 == '\0' || c1 != c2)	    return c1 - c2;	  c1 = (unsigned char) *s1++;	  c2 = (unsigned char) *s2++;	  if (c1 == '\0' || c1 != c2)	    return c1 - c2;	  c1 = (unsigned char) *s1++;	  c2 = (unsigned char) *s2++;	  if (c1 == '\0' || c1 != c2)	    return c1 - c2;	} while (--n4 > 0);      n &= 3;    }  while (n > 0)    {      c1 = (unsigned char) *s1++;      c2 = (unsigned char) *s2++;      if (c1 == '\0' || c1 != c2)	return c1 - c2;      n--;    }  return c1 - c2;}