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Annotation of 43BSD/contrib/icon/operators/null.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * /x - test x for null value.
        !             5:  */
        !             6: 
        !             7: null(nargs, arg1, arg0)
        !             8: int nargs;
        !             9: struct descrip arg1, arg0;
        !            10:    {
        !            11:    DclSave
        !            12:    SetBound;
        !            13: 
        !            14:    /*
        !            15:     * If x is null, it is returned, otherwise, the function fails.
        !            16:     *  Because the pre-dereference value of x is the return value (if
        !            17:     *  any), x is copied into arg0.
        !            18:     */
        !            19:    arg0 = arg1;
        !            20:    DeRef(arg1)
        !            21:    if (!NULLDESC(arg1))
        !            22:       fail();
        !            23:    ClearBound;
        !            24:    }
        !            25: 
        !            26: Opblock(null,1,"/")

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