dummy.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 131 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


#include "gdefn.h"

// This file contains definitions used to create the
// standalone graphics library GRAPH.LIB and GRAPH386.LIB

short           _small_code_;
short           _fltused_;

#pragma aux     _small_code_    "_small_code_";
#pragma aux     _fltused_       "_fltused_";
#pragma aux     F4DivZero       "F4DivZero";
#pragma aux     F4OverFlow      "F4OverFlow";
#pragma aux     F4UnderFlow     "F4UnderFlow";
#if 0
#pragma aux     F8DivZero       "F8DivZero";
#pragma aux     F8OverFlow      "F8OverFlow";
#pragma aux     F8UnderFlow     "F8UnderFlow";
#endif

extern float    F4RetInf( float );
#if defined( __386__ )
#pragma aux     F4RetInf = \
                0x25 0x00 0x00 0x00 0x80    /* and  eax,80000000H */ \
                0x0d 0xff 0xff 0x7f 0x7f    /* or   eax,7f7fffffH */ \
                parm caller [eax] value [eax];
#else
#pragma aux     F4RetInf = \
                0x25 0x00 0x80              /* and  ax,8000H  */ \
                0x0d 0x7f 0x7f              /* or   ax,7f7fH  */ \
                0xba 0xff 0xff              /* mov  dx,0ffffH */ \
                0x92                        /* xchg ax,dx     */ \
                parm caller [ax dx] value [ax dx];
#endif

#if 0
extern double   F8RetInf( double );
#if defined( __386__ )
#pragma aux     F8RetInf = \
                0x25 0x00 0x00 0x00 0x80    /* and  eax,80000000H  */ \
                0x0d 0xff 0xff 0xef 0x7f    /* or   eax,7fefffffH  */ \
                0xba 0xff 0xff 0xff 0xff    /* mov  edx,0ffffffffH */ \
                0x92                        /* xchg eax,edx        */ \
                parm caller [eax edx] value [eax edx];
#else
#pragma aux     F8RetInf = \
                0x25 0x00 0x80              /* and  ax,8000H  */ \
                0x0d 0xef 0x7f              /* or   ax,7fefH  */ \
                0xbb 0xff 0xff              /* mov  bx,0ffffH */ \
                0x8b 0xcb                   /* mov  cx,bx     */ \
                0x8b 0xd3                   /* mov  dx,bx     */ \
                parm caller [ax bx cx dx] value [ax bx cx dx];
#endif
#endif


float _WCI86FAR F4UnderFlow( void )
//============================

{
    return( 0 );
}

float _WCI86FAR F4DivZero( float num )
//===============================

{
    return( F4RetInf( num ) );
}

float _WCI86FAR F4OverFlow( float num )
//================================

{
    return( F4RetInf( num ) );
}

#if 0
double _WCI86FAR F8UnderFlow( void )
//=============================

{
    return( 0 );
}

double _WCI86FAR F8DivZero( double num )
//=================================

{
    return( F8RetInf( num ) );
}

double _WCI86FAR F8OverFlow( double num )
//==================================

{
    return( F8RetInf( num ) );
}
#endif