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

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * x -- y - difference of csets x and y or of sets x and y.
        !             5:  */
        !             6: 
        !             7: diff(nargs, arg2, arg1, arg0)
        !             8: int nargs;
        !             9: struct descrip arg2, arg1, arg0;
        !            10:    {
        !            11:    register int i;
        !            12:    register union block *bp;
        !            13:    int *cs1, *cs2, csbuf1[CSETSIZE], csbuf2[CSETSIZE];
        !            14:    extern struct b_cset *alccset();
        !            15: #ifdef SETS
        !            16:    struct descrip *dp;
        !            17:    struct b_set *srcp, *dstp, *tstp;
        !            18:    struct b_selem *sep;
        !            19:    extern struct b_set *alcset();
        !            20:    extern struct b_selem *alcselem();
        !            21: #endif SETS
        !            22: 
        !            23:    SetBound;
        !            24: #ifdef SETS
        !            25:    DeRef(arg1)
        !            26:    DeRef(arg2)
        !            27:    if (QUAL(arg1) || QUAL(arg2))
        !            28:       goto skipsets;
        !            29:    if (TYPE(arg1) == T_SET && TYPE(arg2) != T_SET)
        !            30:       runerr(119,&arg2);
        !            31:    if (TYPE(arg2) == T_SET && TYPE(arg1) != T_SET)
        !            32:       runerr(119,&arg1);
        !            33:    if (TYPE(arg1) == T_SET && TYPE(arg2) == T_SET) {
        !            34:       /*
        !            35:        * Both x and y are sets - do set difference
        !            36:        *  get enough space for a new set the size of x.
        !            37:        */
        !            38:       hneed(sizeof(struct b_set) + BLKLOC(arg1)->set.setsize *
        !            39:          sizeof(struct b_selem));
        !            40:       /*
        !            41:        * For each element in set x if it isn't in set y
        !            42:        *  copy it directly into the result set.
        !            43:        */
        !            44:       srcp = (struct b_set *) BLKLOC(arg1);
        !            45:       tstp = (struct b_set *) BLKLOC(arg2);
        !            46:       arg0.type = D_SET;
        !            47:       dstp = alcset();
        !            48:       BLKLOC(arg0) = (union block *) dstp;
        !            49:       for (i = 0; i < NBUCKETS; i++) {
        !            50:          sep = (struct b_selem *) BLKLOC(srcp->sbucks[i]);
        !            51:          dp = &dstp->sbucks[i];
        !            52:          while (sep != NULL) {
        !            53:             if ( !locate( BLKLOC(tstp->sbucks[i]), sep) ) {
        !            54:                dp->type = D_SELEM;
        !            55:                BLKLOC(*dp) = (union block *) alcselem(&sep->setmem, sep->hnum);
        !            56:                dp = &BLKLOC(*dp)->selem.sblink;
        !            57:                dstp->setsize++;
        !            58:                }
        !            59:             sep = (struct b_selem *) BLKLOC(sep->sblink);
        !            60:             }
        !            61:          }
        !            62:       }
        !            63:    else {
        !            64:       skipsets:
        !            65: #endif SETS
        !            66:    hneed(sizeof(struct b_cset));
        !            67: 
        !            68:    /*
        !            69:     * x and y must be csets.
        !            70:     */
        !            71:    if (cvcset(&arg1, &cs1, csbuf1) == NULL)
        !            72:       runerr(104, &arg1);
        !            73:    if (cvcset(&arg2, &cs2, csbuf2) == NULL)
        !            74:       runerr(104, &arg2);
        !            75: 
        !            76:    /*
        !            77:     * Allocate a new cset and in each word of it, compute the value
        !            78:     *  of the bitwise difference of the corresponding words in the
        !            79:     *  x and y csets.
        !            80:     */
        !            81:    bp = (union block *) alccset();
        !            82:    for (i = 0; i < CSETSIZE; i++)
        !            83:       bp->cset.bits[i] = cs1[i] & ~cs2[i];
        !            84: 
        !            85:    arg0.type = D_CSET;
        !            86:    BLKLOC(arg0) = bp;
        !            87: #ifdef SETS
        !            88:    }
        !            89: #endif SETS
        !            90:    ClearBound;
        !            91:    }
        !            92: 
        !            93: Opblock(diff,2,"--")

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