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86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
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* have_posscl - determine if have a scalar FILEPOS element
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*
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* usage:
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* have_posscl
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*
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* On some systems, FILEPOS 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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* FILEPOS 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_FILEPOS_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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/*
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* Copyright (c) 1996 by Landon Curt Noll. All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright, this permission notice and text
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* this comment, and the disclaimer below appear in all of the following:
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*
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* supporting documentation
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* source copies
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* source works derived from this source
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* binaries derived from this source or from derived source
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* chongo was here /\../\
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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_fpos.h"
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int
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main(void)
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{
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#if !defined(FILEPOS_NON_SCALAR)
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FILEPOS value; /* an FILEPOS to perform arithmatic on */
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FILEPOS value2; /* an FILEPOS to perform arithmatic on */
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/*
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* do some math opts on an FILEPOS
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*/
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value = (FILEPOS)getpid();
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value2 = (FILEPOS)-1;
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if (value > (FILEPOS)1) {
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--value;
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}
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if (value <= (FILEPOS)getppid()) {
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--value;
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}
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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 FILEPOS to do */\n");
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}
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/*
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* report FILEPOS as a scalar
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*/
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printf("#undef HAVE_FILEPOS_SCALAR\n");
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printf("#define HAVE_FILEPOS_SCALAR /* FILEPOS is a simple value */\n");
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#else
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printf("#undef HAVE_FILEPOS_SCALAR /* FILEPOS 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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