924b11844c
our implementation was fine, but the restrict marker is problematic as gcc 8 is now more strict about checking for restrict issues. this is the only actual consumer of swab(3) in our tree, though, besides the test for it. oh well.
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/* $NetBSD: dd_swab.c,v 1.1 2019/10/04 08:57:38 mrg Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jeffrey Mogul.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: NetBSD: swab.c,v 1.18 2011/01/04 17:14:07 martin Exp
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*/
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/* This copy has no restrict on it, that dd wants */
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)swab.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: dd_swab.c,v 1.1 2019/10/04 08:57:38 mrg Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include "dd.h"
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#include "extern.h"
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void
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dd_swab(const void * from, void * to, ssize_t len)
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{
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char temp;
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const char *fp;
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char *tp;
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if (len <= 1)
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return;
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len /= 2;
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fp = (const char *)from;
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tp = (char *)to;
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#define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp
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if (__predict_false(len == 1)) {
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STEP;
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return;
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}
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/* round to multiple of 8 */
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while ((--len % 8) != 0)
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STEP;
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len /= 8;
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if (len == 0)
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return;
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while (len-- != 0) {
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STEP; STEP; STEP; STEP;
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STEP; STEP; STEP; STEP;
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}
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}
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