/*
 * Copyright (C) 1991, 1992 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 Library General Public License as
 * published by the Free Software Foundation; either version 2 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
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with the GNU C Library; see the file COPYING.LIB in the
 * root directory of this distribution.  If not, write to the, 1992
 * Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/types.h>
#include <linux/string.h>

char * strncpy(char * s1,const char *s2,size_t n)
{
    char c;
    char *s = s1;

    --s1;

    if (n >= 4)
    {
	size_t n4 = n >> 2;

	for (;;)
	{
	    c = *s2++;
	    *++s1 = c;
	    if (c == '\0')
		break;
	    c = *s2++;
	    *++s1 = c;
	    if (c == '\0')
		break;
	    c = *s2++;
	    *++s1 = c;
	    if (c == '\0')
		break;
	    c = *s2++;
	    *++s1 = c;
	    if (c == '\0')
		break;
	    if (--n4 == 0)
		goto last_chars;
	}
	n = n - (s1 - s) -1;
	if (n == 0)
	    return s;
	goto zero_fill;
    }

  last_chars:
    n &= 3;
    if (n == 0)
	return s;

    do
    {
	c = *s2++;
	*++s1 = c;
	if (--n == 0)
	    return s;
    }
    while (c != '\0');

  zero_fill:
    do
	*++s1 = '\0';
    while (--n > 0);

    return s;
}