MkMachDep.cpp

/*
 *  XMail by Davide Libenzi (Intranet and Internet mail server)
 *  Copyright (C) 1999,..,2010  Davide Libenzi
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Davide Libenzi <davidel@xmailserver.org>
 *
 */

#include <stdio.h>

static int MkMachIsLE(void)
{
    union MachWordBytes {
        unsigned int w;
        unsigned char b[sizeof(unsigned int)];
    } MWB;

    MWB.w = 1;

    return MWB.b[0] != 0;
}

static int MkMachIsLEBF(void)
{
    union MachBitField {
        struct {
            unsigned int b:1;
        } BF;
        unsigned int w;
    } MWB;

    MWB.w = 1;

    return MWB.BF.b != 0;
}

static int MkMachGenType(int iBits, char const *pszBase)
{
    fprintf(stdout,
        "typedef signed %s MachInt%d;\n"
        "typedef unsigned %s MachUInt%d;\n"
        "#define MACH_TYPE_%dBIT %s\n\n", pszBase, iBits, pszBase, iBits, iBits, pszBase);

    return 0;
}

int main(int argc, char *argv[])
{
    fprintf(stdout,
        "#ifndef _MACHDEFS_H\n"
        "#define _MACHDEFS_H\n\n\n");

    if (!MkMachIsLE())
        fprintf(stdout, "#define MACH_BIG_ENDIAN_WORDS\n\n");
    else
        fprintf(stdout, "#undef MACH_BIG_ENDIAN_WORDS\n\n");
    if (!MkMachIsLEBF())
        fprintf(stdout, "#define MACH_BIG_ENDIAN_BITFIELD\n\n");
    else
        fprintf(stdout, "#undef MACH_BIG_ENDIAN_BITFIELD\n\n");

    MkMachGenType(8, "char");

    if (sizeof(short) == 2)
        MkMachGenType(16, "short");
    else if (sizeof(int) == 2)
        MkMachGenType(16, "int");
    else if (sizeof(long) == 2)
        MkMachGenType(16, "long");

    if (sizeof(char) == 4)
        MkMachGenType(32, "char");
    else if (sizeof(short) == 4)
        MkMachGenType(32, "short");
    else if (sizeof(int) == 4)
        MkMachGenType(32, "int");
    else if (sizeof(long) == 4)
        MkMachGenType(32, "long");

#if defined(_MSC_VER)
    MkMachGenType(64, "__int64");
#elif defined(__GNUC__) || defined(__SUNPRO_CC)
    MkMachGenType(64, "long long");
#else
#error Your compiler is not supported!
#endif

    fprintf(stdout, "\n\n" "#endif\n\n");

    return 0;
}