1 /*

     2  * Copyright (c) 1989, 1993

     3  *	The Regents of the University of California.  All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions

     7  * are met:

     8  * 1. Redistributions of source code must retain the above copyright

     9  *    notice, this list of conditions and the following disclaimer.

    10  * 2. Redistributions in binary form must reproduce the above copyright

    11  *    notice, this list of conditions and the following disclaimer in the

    12  *    documentation and/or other materials provided with the distribution.

    13  * 4. Neither the name of the University nor the names of its contributors

    14  *    may be used to endorse or promote products derived from this software

    15  *    without specific prior written permission.

    16  *

    17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

    18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

    21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

    23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

    25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

    26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

    27  * SUCH DAMAGE.

    28  * © Portions copyright (c) 2005-2006  Nokia Corporation.  All rights reserved.

    29  */

    30 

    31 #if defined(LIBC_SCCS) && !defined(lint)

    32 static char sccsid[] = "@(#)strncmp.c	8.1 (Berkeley) 6/4/93";

    33 #endif /* LIBC_SCCS and not lint */

    34 #include <sys/cdefs.h>

    35 #ifndef __SYMBIAN32__

    36 __FBSDID("$FreeBSD: src/lib/libc/string/strncmp.c,v 1.5 2002/03/21 18:44:54 obrien Exp $");

    37 #endif

    38 

    39 #include <string.h>

    40 

    41 EXPORT_C int

    42 strncmp(const char *s1, const char *s2,

    43 	size_t n)

    44 	

    45 {

    46 

    47 	if (n == 0)

    48 		return (0);

    49 	do {

    50 		if (*s1 != *s2++)

    51 			return (*(const unsigned char *)s1 -

    52 				*(const unsigned char *)(s2 - 1));

    53 		if (*s1++ == 0)

    54 			break;

    55 	} while (--n != 0);

    56 	return (0);

    57 }