minix/common/lib/libc/arch/arm/string/strncmp.S
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
2014-07-28 17:05:06 +02:00

78 lines
2.2 KiB
ArmAsm

/* $NetBSD: strncmp.S,v 1.2 2013/08/19 00:57:25 matt Exp $ */
/*
* Copyright (c) 2002 ARM Ltd
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the company may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
RCSID("$NetBSD: strncmp.S,v 1.2 2013/08/19 00:57:25 matt Exp $")
ENTRY(strncmp)
/* if ((len - 1) < 0) return 0 */
subs r2, r2, #1
#ifdef __thumb__
bmi 5f
#else
movmi r0, #0
RETc(mi)
#endif
/* ip == last src address to compare */
#ifdef __thumb__
adds r3, r0, r2
mov ip, r3
subs r1, r1, r0
#else
add ip, r0, r2
#endif
1:
#ifdef __thumb__
ldrb r2, [r0]
ldrb r3, [r1, r0]
adds r0, r0, #1
cmp ip, r0 /* exhausted length? */
bcc 4f /* yes, we're done */
cmp r2, #1 /* NUL? */
bcc 4f /* yes, we're done */
cmp r2, r3 /* different? */
#else
ldrb r2, [r0], #1
ldrb r3, [r1], #1
cmp ip, r0
cmpcs r2, #1
cmpcs r2, r3
#endif
beq 1b
4: subs r0, r2, r3
RET
#ifdef __thumb__
5: movs r0, #0
RET
#endif
END(strncmp)