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Annotation of 43BSD/contrib/icon/functions/list.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * list(n,x) - create a list of size n, with initial value x.
        !             5:  */
        !             6: 
        !             7: Xlist(nargs, arg2, arg1, arg0)
        !             8: int nargs;
        !             9: struct descrip arg2, arg1, arg0;
        !            10:    {
        !            11:    register int i, size;
        !            12:    register struct b_lelem *bp;
        !            13:    register struct b_list *hp;
        !            14:    int nelem;
        !            15:    extern struct b_list *alclist();
        !            16:    extern struct b_lelem *alclstb();
        !            17: 
        !            18:    defshort(&arg1, 0); /* Size defaults to 0 */
        !            19:    DeRef(arg2)
        !            20: 
        !            21:    nelem = size = INTVAL(arg1);
        !            22:    /*
        !            23:     * Ensure that the size is positive and that the list element block will
        !            24:     *  have at least LISTBLKSIZE element slots.
        !            25:     */
        !            26:    if (size < 0)
        !            27:       runerr(205, &arg1);
        !            28:    if (nelem < LISTBLKSIZE)
        !            29:       nelem = LISTBLKSIZE;
        !            30: 
        !            31:    /*
        !            32:     * Ensure space for a list header block, and a list element block
        !            33:     * with nelem element slots.
        !            34:     */
        !            35:    hneed(sizeof(struct b_list) + sizeof(struct b_lelem) +
        !            36:          nelem * sizeof(struct descrip));
        !            37: 
        !            38:    /*
        !            39:     * Allocate the list header block and a list element block.
        !            40:     *  Note that nelem is not equivalent to size
        !            41:     *  because nelem is the number of elements in the list element
        !            42:     *  block while size is the number of elements in the
        !            43:     *  list.
        !            44:     */
        !            45:    hp = alclist(size);
        !            46:    bp = alclstb(nelem, 0, size);
        !            47:    hp->listhead.type = hp->listtail.type = D_LELEM;
        !            48:    BLKLOC(hp->listhead) = BLKLOC(hp->listtail) = (union block *) bp;
        !            49:    /*
        !            50:     * Initialize each list element.
        !            51:     */
        !            52:    for (i = 0; i < size; i++)
        !            53:       bp->lslots[i] = arg2;
        !            54:    /*
        !            55:     * Return the new list.
        !            56:     */
        !            57:    arg0.type = D_LIST;
        !            58:    BLKLOC(arg0) = (union block *) hp;
        !            59:    }
        !            60: 
        !            61: Procblock(list,2)

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