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127 lines
4 KiB
C++
127 lines
4 KiB
C++
/****************************************************************************
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**
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** This file is based on sources of the Qt GUI Toolkit, used under the terms
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** of the GNU General Public License version 2 (see the original copyright
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** notice below).
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** All further contributions to this file are (and are required to be)
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** licensed under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** The original Qt license header follows:
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**
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**
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** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
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**
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** This file is part of the kernel module of the Qt GUI Toolkit.
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**
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** This file may be distributed under the terms of the Q Public License
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** as defined by Trolltech AS of Norway and appearing in the file
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** LICENSE.QPL included in the packaging of this file.
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**
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** This file may be distributed and/or modified under the terms of the
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** GNU General Public License version 2 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file.
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**
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** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
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** licenses may use this file in accordance with the Qt Commercial License
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** Agreement provided with the Software.
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**
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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**
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** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
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** information about Qt Commercial License Agreements.
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** See http://www.trolltech.com/qpl/ for QPL licensing information.
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** See http://www.trolltech.com/gpl/ for GPL licensing information.
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**
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** Contact info@trolltech.com if any conditions of this licensing are
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** not clear to you.
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**
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**********************************************************************/
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#include "qglobal.h"
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static bool si_alreadyDone = false;
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static int si_wordSize;
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static bool si_bigEndian;
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/*!
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\relates QApplication
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Obtains information about the system.
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The system's word size in bits (typically 32) is returned in \a
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*wordSize. The \a *bigEndian is set to TRUE if this is a big-endian
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machine, or to FALSE if this is a little-endian machine.
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In debug mode, this function calls qFatal() with a message if the
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computer is truly weird (i.e. different endianness for 16 bit and
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32 bit integers); in release mode it returns FALSE.
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*/
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bool qSysInfo( int *wordSize, bool *bigEndian )
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{
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#if defined(QT_CHECK_NULL)
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Q_ASSERT( wordSize != 0 );
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Q_ASSERT( bigEndian != 0 );
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#endif
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if ( si_alreadyDone ) { // run it only once
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*wordSize = si_wordSize;
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*bigEndian = si_bigEndian;
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return true;
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}
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si_wordSize = 0;
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Q_ULONG n = (Q_ULONG)(~0);
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while ( n ) { // detect word size
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si_wordSize++;
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n /= 2;
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}
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*wordSize = si_wordSize;
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if ( *wordSize != 64 &&
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*wordSize != 32 &&
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*wordSize != 16 ) { // word size: 16, 32 or 64
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#if defined(QT_CHECK_RANGE)
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qFatal( "qSysInfo: Unsupported system word size %d", *wordSize );
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#endif
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return false;
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}
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if ( sizeof(Q_INT8) != 1 || sizeof(Q_INT16) != 2 || sizeof(Q_INT32) != 4 ||
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sizeof(Q_ULONG)*8 != si_wordSize || sizeof(float) != 4 || sizeof(double) != 8 ) {
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#if defined(QT_CHECK_RANGE)
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qFatal( "qSysInfo: Unsupported system data type size" );
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#endif
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return false;
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}
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bool be16, be32; // determine byte ordering
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short ns = 0x1234;
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int nl = 0x12345678;
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unsigned char *p = (unsigned char *)(&ns); // 16-bit integer
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be16 = *p == 0x12;
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p = (unsigned char *)(&nl); // 32-bit integer
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if ( p[0] == 0x12 && p[1] == 0x34 && p[2] == 0x56 && p[3] == 0x78 )
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be32 = true;
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else
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if ( p[0] == 0x78 && p[1] == 0x56 && p[2] == 0x34 && p[3] == 0x12 )
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be32 = false;
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else
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be32 = !be16;
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if ( be16 != be32 ) { // strange machine!
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#if defined(QT_CHECK_RANGE)
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qFatal( "qSysInfo: Inconsistent system byte order" );
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#endif
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return false;
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}
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*bigEndian = si_bigEndian = be32;
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si_alreadyDone = true;
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return true;
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}
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