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96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/*
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* have_offscl - determine if we have a scalar off_t element
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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: 1996/07/13 12:57:22
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* File existed as early as: 1996
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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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/*
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* usage:
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* have_offscl
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*
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* On some systems, off_t is a scalar value on which one can perform
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* arithmetic operations, assignments and comparisons. On some systems
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* off_t is some sort of union or struct which must be converted into
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* a ZVALUE in order to perform arithmetic operations, assignments and
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* comparisons.
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*
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*
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* This prog outputs several defines:
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*
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* HAVE_OFF_T_SCALAR
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* defined ==> OK to perform arithmetic ops, = and comparisons
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* undefined ==> convert to ZVALUE first
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.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 "banned.h" /* include after system header <> includes */
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int
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main(void)
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{
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#if !defined(OFF_T_NON_SCALAR)
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off_t value; /* an off_t to perform arithmetic on */
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off_t value2; /* an off_t to perform arithmetic on */
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/*
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* do some math opts on an off_t
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*/
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value = (off_t)getpid();
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value2 = (off_t)-1;
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if (value > (off_t)1) {
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--value;
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}
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#if !defined(_WIN32) && !defined(_WIN64)
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if (value <= (off_t)getppid()) {
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--value;
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}
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#endif
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if (value == value2) {
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value += value2;
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}
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value <<= 1;
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if (!value) {
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printf("/* something for the off_t to do */\n");
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}
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/*
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* report off_t as a scalar
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*/
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printf("#undef HAVE_OFF_T_SCALAR\n");
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printf("#define HAVE_OFF_T_SCALAR /* off_t is a simple value */\n");
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#else
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printf("#undef HAVE_OFF_T_SCALAR /* off_t is not a simple value */\n");
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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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