/*

 *  Copyright (C) 2013-2024 Cisco Systems, Inc. and/or its affiliates. All rights reserved.

 *  Copyright (C) 2013 Sourcefire, Inc.

 *

 *  Authors: Steven Morgan <smorgan@sourcefire.com>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as

 *  published by the Free Software Foundation.

 *

 *  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., 51 Franklin Street, Fifth Floor, Boston,

 *  MA 02110-1301, USA.

 */

#include "others.h"

#include "fpu.h"

/* the character representation of the double below is "elleemme" or "emmeelle" upon depending

   whether floating point little endian or big endian(IEEE-754) is in effect. */

int get_fpu_endian(void)

{

#ifdef _WIN32

    return FPU_ENDIAN_LITTLE;

#else

    const char* fpu_le = "elleemme";

    const char* fpu_be = "emmeelle";

    const union sd {

        double d;

        char mem[8];

    } u_md = {3815911171354501045744583353695226502220105394563506259449467213186125718792664588210662403287568710818873279842508553551908601408568128557088985172985437412593385138085986771664896.0};

    if (!memcmp(u_md.mem, fpu_le, 8)) {

        cli_dbgmsg("fpu: Floating point little endian detected.\n");

        return FPU_ENDIAN_LITTLE;

    } else if (!memcmp(u_md.mem, fpu_be, 8)) {

        cli_dbgmsg("fpu: Floating point big endian detected.\n");

        return FPU_ENDIAN_BIG;

    } else {

        cli_dbgmsg("fpu: Floating point endian detection failed. "

                   "Bytes: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x \n",

                   u_md.mem[0], u_md.mem[1], u_md.mem[2], u_md.mem[3],

                   u_md.mem[4], u_md.mem[5], u_md.mem[6], u_md.mem[7]);

    }

    return FPU_ENDIAN_UNKNOWN;

#endif

}