90 lines
3.2 KiB
ArmAsm
90 lines
3.2 KiB
ArmAsm
/* $NetBSD: strlcpy.S,v 1.1 2002/06/06 20:31:22 fredette Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2002 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Matthew Fredette.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* 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>
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
RCSID("$NetBSD: strlcpy.S,v 1.1 2002/06/06 20:31:22 fredette Exp $")
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
/*
|
|
* size_t strlcpy(char *dst, const char *src, size_t size);
|
|
*/
|
|
LEAF_ENTRY(strlcpy)
|
|
|
|
/* Always load the first byte of the source string. */
|
|
ldbs,ma 1(%arg1), %r1
|
|
|
|
/*
|
|
* If our dst buffer is zero bytes, branch immediately
|
|
* to the code that counts the (remaining) length
|
|
* of the src string.
|
|
*/
|
|
comb,= %r0, %arg2, $strlcpy_dst_done
|
|
copy %arg1, %ret0
|
|
|
|
/*
|
|
* If our dst buffer is one byte, branch immediately
|
|
* to the code that NUL-terminates the dst buffer and
|
|
* counts the (remaining) length of the src string.
|
|
*/
|
|
addib,=,n -1, %arg2, $strlcpy_dst_full
|
|
|
|
/*
|
|
* Loop copying bytes. At the top of this loop,
|
|
* %arg2 is always the number of bytes we can still
|
|
* store, and %r1 holds the next byte to store.
|
|
*/
|
|
$strlcpy_loop
|
|
comb,= %r0, %r1, $strlcpy_exit
|
|
stbs,ma %r1, 1(%arg0)
|
|
addib,<> -1, %arg2, $strlcpy_loop
|
|
ldbs,ma 1(%arg1), %r1
|
|
|
|
$strlcpy_dst_full
|
|
stbs,ma %r0, 1(%arg0)
|
|
|
|
$strlcpy_dst_done
|
|
comb,<>,n %r0, %r1, $stlcpy_dst_done
|
|
ldbs,ma 1(%arg1), %r1
|
|
|
|
$strlcpy_exit
|
|
bv %r0(%rp)
|
|
sub %arg1, %ret0, %ret0
|
|
EXIT(strlcpy)
|