70164d957e
Casting to int truncates size on some platforms, resulting swab not copying all the data. Cast len to size_t to avoid right shifting a signed value: we know here it's > 0, so we can safely cast it w/o losing precision. In addition, be more careful with signedness of char pointers and temporaries. Downgrade tmp from unsigned long to unsigned char since we're only reading and writing characters. Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/516
65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)swab.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <unistd.h>
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void
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swab(const void * __restrict from, void * __restrict to, ssize_t len)
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{
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unsigned char temp;
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size_t n;
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const unsigned char *fp;
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unsigned char *tp;
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if (len <= 0)
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return;
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n = (size_t)len >> 1;
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fp = (const unsigned char *)from;
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tp = (unsigned char *)to;
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#define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp
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/* round to multiple of 8 */
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for (; n & 0x7; --n)
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STEP;
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for (n >>= 3; n > 0; --n) {
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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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