minix/lib/nbsd_libc/arch/hppa/string/strlcpy.S

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/* $NetBSD: strlcpy.S,v 1.3 2008/04/28 20:22:56 martin 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.
*
* 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 1.3 2008/04/28 20:22:56 martin Exp $")
#endif /* LIBC_SCCS and not lint */
/*
* size_t strlcpy(char *dst, const char *src, size_t size);
*/
LEAF_ENTRY(_strlcpy)
.weak strlcpy
strlcpy = _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, $strlcpy_dst_done
ldbs,ma 1(%arg1), %r1
$strlcpy_exit:
bv %r0(%rp)
sub %arg1, %ret0, %ret0
EXIT(strlcpy)