/* * have_posscl - determine if we have a scalar FILEPOS element * * Copyright (C) 1999  Landon Curt Noll * * Calc is open software; you can redistribute it and/or modify it under * the terms of the version 2.1 of the GNU Lesser General Public License * as published by the Free Software Foundation. * * Calc is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General * Public License for more details. * * A copy of version 2.1 of the GNU Lesser General Public License is * distributed with calc under the filename COPYING-LGPL.  You should have * received a copy with calc; if not, write to Free Software Foundation, Inc. * 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA. * * @(#) $Revision: 29.2 $ * @(#) $Id: have_posscl.c,v 29.2 2000/06/07 14:02:13 chongo Exp $ * @(#) $Source: /usr/local/src/cmd/calc/RCS/have_posscl.c,v $ * * Under source code control:	1996/07/13 12:57:22 * File existed as early as:	1996 * * chongo <was here> /\oo/\	http://www.isthe.com/chongo/ * Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/ *//* * usage: *	have_posscl * * On some systems, FILEPOS is a scalar value on which one can perform * arithmetic operations, assignments and comparisons.	On some systems * FILEPOS is some sort of union or struct which must be converted into * a ZVALUE in order to perform arithmetic operations, assignments and * comparisons. * * This prog outputs several defines: * *	HAVE_FILEPOS_SCALAR *		defined ==> ok to perform arithmetic ops, = and comparisons *		undefined ==> convert to ZVALUE first */#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include "have_fpos.h"intmain(void){#if !defined(FILEPOS_NON_SCALAR)	FILEPOS value;	/* an FILEPOS to perform arithmatic on */	FILEPOS value2; /* an FILEPOS to perform arithmatic on */	/*	 * do some math opts on an FILEPOS	 */	value = (FILEPOS)getpid();	value2 = (FILEPOS)-1;	if (value > (FILEPOS)1) {		--value;	}	if (value <= (FILEPOS)getppid()) {		--value;	}	if (value == value2) {		value += value2;	}	value <<= 1;	if (!value) {		printf("/* something for the FILEPOS to do */\n");	}	/*	 * report FILEPOS as a scalar	 */	printf("#undef HAVE_FILEPOS_SCALAR\n");	printf("#define HAVE_FILEPOS_SCALAR /* FILEPOS is a simple value */\n");#else	printf("#undef HAVE_FILEPOS_SCALAR /* FILEPOS is not a simple value */\n");#endif	/* exit(0); */	return 0;}