1*38848718Sguenther/* $OpenBSD: strncmp.S,v 1.6 2016/08/06 19:16:09 guenther Exp $ */ 2d987040fSdrahn/* $NetBSD: strncmp.S,v 1.2 2003/04/05 23:08:52 bjh21 Exp $ */ 3d987040fSdrahn 4d987040fSdrahn/* 5d987040fSdrahn * Copyright (c) 2002 ARM Ltd 6d987040fSdrahn * All rights reserved. 7d987040fSdrahn * 8d987040fSdrahn * Redistribution and use in source and binary forms, with or without 9d987040fSdrahn * modification, are permitted provided that the following conditions 10d987040fSdrahn * are met: 11d987040fSdrahn * 1. Redistributions of source code must retain the above copyright 12d987040fSdrahn * notice, this list of conditions and the following disclaimer. 13d987040fSdrahn * 2. Redistributions in binary form must reproduce the above copyright 14d987040fSdrahn * notice, this list of conditions and the following disclaimer in the 15d987040fSdrahn * documentation and/or other materials provided with the distribution. 16d987040fSdrahn * 3. The name of the company may not be used to endorse or promote 17d987040fSdrahn * products derived from this software without specific prior written 18d987040fSdrahn * permission. 19d987040fSdrahn * 20d987040fSdrahn * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED 21d987040fSdrahn * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 22d987040fSdrahn * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23d987040fSdrahn * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24d987040fSdrahn * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 25d987040fSdrahn * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26d987040fSdrahn * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27d987040fSdrahn * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28d987040fSdrahn * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29d987040fSdrahn * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30d987040fSdrahn */ 31d987040fSdrahn 32*38848718Sguenther#include "DEFS.h" 33d987040fSdrahn 34d987040fSdrahnENTRY(strncmp) 35951d8da3Sdrahn/* if (len == 0) return 0 */ 36951d8da3Sdrahn cmp r2, #0 37951d8da3Sdrahn moveq r0, #0 38951d8da3Sdrahn moveq pc, lr 39951d8da3Sdrahn 40951d8da3Sdrahn/* subtract one to have the index of the last character to check */ 41951d8da3Sdrahn sub r2, r2, #1 42d987040fSdrahn 43d987040fSdrahn/* ip == last src address to compare */ 44d987040fSdrahn add ip, r0, r2 45d987040fSdrahn1: 46d987040fSdrahn ldrb r2, [r0], #1 47d987040fSdrahn ldrb r3, [r1], #1 48d987040fSdrahn cmp ip, r0 49d987040fSdrahn cmpcs r2, #1 50d987040fSdrahn cmpcs r2, r3 51d987040fSdrahn beq 1b 52d987040fSdrahn sub r0, r2, r3 53d987040fSdrahn mov pc, lr 549b9d2a55SguentherEND_STRONG(strncmp) 55