b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
85 lines
2.8 KiB
ArmAsm
85 lines
2.8 KiB
ArmAsm
/* $NetBSD: strlcpy.S,v 1.3 2008/04/28 20:22:56 martin Exp $ */
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/*
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthew Fredette.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: strlcpy.S,v 1.3 2008/04/28 20:22:56 martin Exp $")
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#endif /* LIBC_SCCS and not lint */
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/*
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* size_t strlcpy(char *dst, const char *src, size_t size);
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*/
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LEAF_ENTRY(_strlcpy)
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.weak strlcpy
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strlcpy = _strlcpy
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/* Always load the first byte of the source string. */
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ldbs,ma 1(%arg1), %r1
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/*
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* If our dst buffer is zero bytes, branch immediately
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* to the code that counts the (remaining) length
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* of the src string.
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*/
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comb,= %r0, %arg2, $strlcpy_dst_done
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copy %arg1, %ret0
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/*
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* If our dst buffer is one byte, branch immediately
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* to the code that NUL-terminates the dst buffer and
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* counts the (remaining) length of the src string.
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*/
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addib,=,n -1, %arg2, $strlcpy_dst_full
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/*
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* Loop copying bytes. At the top of this loop,
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* %arg2 is always the number of bytes we can still
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* store, and %r1 holds the next byte to store.
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*/
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$strlcpy_loop:
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comb,= %r0, %r1, $strlcpy_exit
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stbs,ma %r1, 1(%arg0)
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addib,<> -1, %arg2, $strlcpy_loop
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ldbs,ma 1(%arg1), %r1
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$strlcpy_dst_full:
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stbs,ma %r0, 1(%arg0)
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$strlcpy_dst_done:
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comb,<>,n %r0, %r1, $strlcpy_dst_done
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ldbs,ma 1(%arg1), %r1
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$strlcpy_exit:
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bv %r0(%rp)
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sub %arg1, %ret0, %ret0
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EXIT(strlcpy)
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