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Annotation of 43BSD/lib/libc/gen/frexp.c, revision 1.1

1.1     ! root        1: #if defined(LIBC_SCCS) && !defined(lint)
        !             2: static char sccsid[] = "@(#)frexp.c    5.2 (Berkeley) 3/9/86";
        !             3: #endif LIBC_SCCS and not lint
        !             4: 
        !             5: /*
        !             6:  *     the call
        !             7:  *             x = frexp(arg,&exp);
        !             8:  *     must return a double fp quantity x which is <1.0
        !             9:  *     and the corresponding binary exponent "exp".
        !            10:  *     such that
        !            11:  *             arg = x*2^exp
        !            12:  *     if the argument is 0.0, return 0.0 mantissa and 0 exponent.
        !            13:  */
        !            14: 
        !            15: double
        !            16: frexp(x,i)
        !            17: double x;
        !            18: int *i;
        !            19: {
        !            20:        int neg;
        !            21:        int j;
        !            22:        j = 0;
        !            23:        neg = 0;
        !            24:        if(x<0){
        !            25:                x = -x;
        !            26:                neg = 1;
        !            27:                }
        !            28:        if(x>=1.0)
        !            29:                while(x>=1.0){
        !            30:                        j = j+1;
        !            31:                        x = x/2;
        !            32:                        }
        !            33:        else if(x<0.5 && x != 0.0)
        !            34:                while(x<0.5){
        !            35:                        j = j-1;
        !            36:                        x = 2*x;
        !            37:                        }
        !            38:        *i = j;
        !            39:        if(neg) x = -x;
        !            40:        return(x);
        !            41:        }

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