minix/common/lib/libc/arch/arm/string/strlcat_naive.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

79 lines
3 KiB
ArmAsm

/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 THE FOUNDATION OR CONTRIBUTORS
* 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: strlcat_naive.S,v 1.3 2013/08/22 19:25:00 matt Exp $")
/* LINTSTUB: size_t strlcat(char *, const char *, size_t) */
ENTRY(strlcat)
adds r3, r2, r0 /* point to just end of dst */
mov ip, r0 /* need to keep r0 for a while */
1: cmp ip, r3 /* still within dst? */
beq 3f /* no, get length of src */
ldrb r2, [ip], #1 /* load next byte */
cmp r2, #0 /* was it a NUL? */
bne 1b /* no, get next byte */
sub r0, ip, r0 /* get actual length of dst */
subs r0, r0, #1 /* account for the trailing NUL */
subs r3, r3, #1 /* back up to last byte in dst */
sub ip, ip, #1 /* back up over the NUL */
2: ldrb r2, [r1], #1 /* load next byte from append */
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
cbz r2, 5f /* was it a NUL? yes, end of append */
#else
cmp r2, #0 /* was it a NUL? */
beq 5f /* yes, end of append */
#endif
adds r0, r0, #1 /* count another byte */
cmp ip, r3 /* do we have enough room for it? */
#ifdef __thumb__
bge 2b
strb r2, [ip], #1 /* yes, store it */
#else
strblt r2, [ip], #1 /* yes, store it */
#endif
b 2b /* get next byte from append */
3: subs r0, r3, r0 /* move size to return value */
4: ldrb r2, [r1], #1 /* load next byte from append */
#if defined(__thumb__) && defined(_ARM_ARCH_T2)
cbz r2, 6f /* was it a NUL? yes, we're done */
#else
RETc(eq) /* yes, we're done */
#endif
adds r0, r0, #1 /* add one to return value */
b 4b /* get next byte from append */
5: movs r2, #0 /* NUL */
strb r2, [ip] /* append final NUL */
6: RET /* return */
END(strlcat)