have_fpos_pos.c

/*
 * have_fpos_pos - Determine if a __pos element in FILEPOS
 *
 * Copyright (C) 2000,2021  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.
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Under source code control:   2000/12/17 01:23
 * File existed as early as:    2000
 *
 * chongo <was here> /\oo/\     http://www.isthe.com/chongo/
 * Share and enjoy!  :-)        http://www.isthe.com/chongo/tech/comp/calc/
 */


#include <stdio.h>
#include "have_fgetsetpos.h"
#include "have_posscl.h"
#include "have_string.h"
#ifdef HAVE_STRING_H
# include <string.h>
#endif


#include "banned.h"     /* include after system header <> includes */


int
main(void)
{
#if defined(HAVE_FILEPOS_SCALAR)

        printf("/* HAVE_FILEPOS_SCALAR is defined, we assume FILEPOS is scalar */\n");
        printf("/* we assume we have no __pos in FILEPOS */\n");
        printf("#undef HAVE_FPOS_POS\t/* no */\n");
        printf("#undef FPOS_POS_BITS\n");
        printf("#undef FPOS_POS_LEN\n");

#else

        printf("/* HAVE_FILEPOS_SCALAR is undefined, we assume FILEPOS is not scalar */\n");
# if defined(HAVE_NO_FPOS_POS)
        printf("/* HAVE_NO_FPOS_POS defiled, we assume we have no __pos in FILEPOS */\n");
        printf("#undef HAVE_FPOS_POS\t/* no */\n");
        printf("#undef FPOS_POS_BITS\n");
        printf("#undef FPOS_POS_LEN\n");

# elif defined(FPOS_POS_BITS)
        printf("/* FPOS_POS_BITS defiled, assume we have __pos in FILEPOS */\n");
        printf("#undef HAVE_FPOS_POS\n");
        printf("#define HAVE_FPOS_POS 1  /* yes */\n");
        printf("#undef FPOS_POS_BITS\n");
        printf("#define FPOS_POS_BITS %d\n", FPOS_POS_BITS);
        printf("#undef FPOS_POS_LEN\n");
        printf("#define FPOS_POS_LEN %d\n", int(FPOS_POS_BITS/8));
# else
        fpos_t pos;             /* file position */

        memset(&pos, 0, sizeof(pos));   /* zeroize pos to "set it" */
        printf("/* we successfully compiled with a fpos_t type wit an __pos element */\n");
        printf("#undef HAVE_FPOS_POS\n");
        printf("#define HAVE_FPOS_POS 1  /* yes */\n");
        printf("#undef FPOS_POS_BITS\n");
        printf("#define FPOS_POS_BITS %lu\n", sizeof(pos.__pos)*8);
        printf("#undef FPOS_POS_LEN\n");
        printf("#define FPOS_POS_LEN %lu\n", sizeof(pos.__pos));
# endif
#endif
        /* exit(0); */
        return 0;
}