strncmp.c

T-kernel 的extension源代码

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	@(#)strncmp.c 
 *
 */

#include <basic.h>
#include <string.h>

int	strncmp(const char *s1, const char *s2, size_t len)
{
	int	n;

	while ( len-- > 0 ) {
		if ( (n = (UB)*s1 - (UB)*s2++) != 0 ) {
			return n;
		}
		if ( *s1++ == '\0' ) {
			break;
		}
	}

	return 0;
}