/*

  *  Copyright (C) 2013-2019 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

 }