53 lines
2.1 KiB
C
53 lines
2.1 KiB
C
/*
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* Copyright (C) 2013-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
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* Copyright (C) 2013 Sourcefire, Inc.
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*
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* Authors: Steven Morgan <smorgan@sourcefire.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "others.h"
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#include "fpu.h"
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/* the character representation of the double below is "elleemme" or "emmeelle" upon depending
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whether floating point little endian or big endian(IEEE-754) is in effect. */
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int get_fpu_endian(void)
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{
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#ifdef _WIN32
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return FPU_ENDIAN_LITTLE;
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#else
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const char* fpu_le = "elleemme";
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const char* fpu_be = "emmeelle";
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const union sd {
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double d;
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char mem[8];
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} u_md = {3815911171354501045744583353695226502220105394563506259449467213186125718792664588210662403287568710818873279842508553551908601408568128557088985172985437412593385138085986771664896.0};
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if (!memcmp(u_md.mem, fpu_le, 8)) {
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cli_dbgmsg("fpu: Floating point little endian detected.\n");
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return FPU_ENDIAN_LITTLE;
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} else if (!memcmp(u_md.mem, fpu_be, 8)) {
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cli_dbgmsg("fpu: Floating point big endian detected.\n");
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return FPU_ENDIAN_BIG;
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} else {
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cli_dbgmsg("fpu: Floating point endian detection failed. "
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"Bytes: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x \n",
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u_md.mem[0], u_md.mem[1], u_md.mem[2], u_md.mem[3],
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u_md.mem[4], u_md.mem[5], u_md.mem[6], u_md.mem[7]);
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}
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return FPU_ENDIAN_UNKNOWN;
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#endif
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}
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