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99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* align32 - determine if 32 bit accesses must be aligned
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*
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* Copyright (C) 1999,2021 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 1995/11/23 05:18:06
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* File existed as early as: 1995
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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#include <stdio.h>
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#include <signal.h>
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#include "have_stdlib.h"
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#if defined(HAVE_STDLIB_H)
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#include <stdlib.h>
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#endif
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#include "longbits.h"
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#include "have_unistd.h"
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#if defined(HAVE_UNISTD_H)
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#include <unistd.h>
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#endif
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#include "have_unused.h"
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#include "banned.h" /* include after system header <> includes */
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static void buserr(int arg); /* catch alignment errors */
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int
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main(void)
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{
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char byte[2*sizeof(USB32)]; /* mis-alignment buffer */
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USB32 *p; /* mis-alignment pointer */
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unsigned long i;
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#if defined(MUST_ALIGN32)
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/* force alignment */
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printf("#define MUST_ALIGN32\t%c* forced to align 32 bit values *%c\n",
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'/', '/');
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#else
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/* setup to catch alignment bus errors */
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signal(SIGBUS, buserr);
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signal(SIGSEGV, buserr); /* some systems will generate SEGV instead! */
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/* mis-align our long fetches */
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for (i=0; i < sizeof(USB32); ++i) {
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p = (USB32 *)(byte+i);
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*p = i;
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*p += 1;
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}
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/* if we got here, then we can mis-align longs */
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printf("#undef MUST_ALIGN32\t%c* can mis-align 32 bit values *%c\n",
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'/', '/');
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#endif
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/* exit(0); */
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return 0;
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}
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/*
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* buserr - catch an alignment error
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*
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* given:
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* arg to keep ANSI C happy
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*/
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/*ARGSUSED*/
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static void
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buserr(int UNUSED(arg))
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{
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/* alignment is required */
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printf("#define MUST_ALIGN32\t%c* must align 32 bit values *%c\n",
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'/', '/');
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exit(0);
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}
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