math2err.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 68 行

/****************************************************************************
*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include "variety.h"
#include <math.h>
#include "mathcode.h"
#undef  __math_func__
#define __math_func__
#include "mathcode.h"

_WMRTLINK double __math1err( unsigned int err_info, double *arg1 )
{
    return( __math2err( err_info, arg1, arg1 ) );
}

_WMRTLINK double __math2err( unsigned int err_info, double *arg1, double *arg2 )
{
    int                 why;
    struct exception    exc;

    exc.arg1 = *arg1;
    exc.arg2 = *arg2;
    if(      err_info & M_DOMAIN   ) { why = DOMAIN;   }
    else if( err_info & M_SING     ) { why = SING;     }
    else if( err_info & M_OVERFLOW ) { why = OVERFLOW; }
    else if( err_info & M_UNDERFLOW) { why = UNDERFLOW;}
    else if( err_info & M_PLOSS    ) { why = PLOSS;    }
    else if( err_info & M_TLOSS    ) { why = TLOSS;    }
    exc.type = why;
    exc.name = MathFuncNames[ (err_info & FUNC_MASK) - 1 ];
    if(      err_info & V_NEG_HUGEVAL ) { exc.retval = - HUGE_VAL; }
    else if( err_info & V_ZERO        ) { exc.retval = 0.0;        }
    else if( err_info & V_ONE         ) { exc.retval = 1.0;        }
    else if( err_info & V_HUGEVAL     ) { exc.retval = HUGE_VAL;   }
    else  /* PLOSS from sin,cos,tan */  { exc.retval = *arg2;      }

    return( _matherr( &exc ) );
}