math87e.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 58 行

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*
*                            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
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#include "variety.h"
#include <stddef.h>
#include <math.h>
#include "mathcode.h"


_WMRTLINK double __math87_err( double x, unsigned char code )
/***********************************************************/
{
    unsigned int  err_code;

    switch( code ) {
    case FUNC_ACOS:
    case FUNC_ASIN:
    case FUNC_SQRT:
        return( __math1err( code | M_DOMAIN | V_ZERO, &x ) );
    case FUNC_EXP:
        if( x < 0.0 ) return( 0.0 );
    }
    err_code = code | M_OVERFLOW | V_HUGEVAL;
    if( code == FUNC_SINH ) {
        if( x < 0.0 )  err_code = code | M_OVERFLOW | V_NEG_HUGEVAL;
    }
    return( __math1err( err_code, &x ) );
}