dtstat.c

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#include        "dthdr.h"

/*      Get statistics of a dictionary
**
**      Written by Kiem-Phong Vo (5/25/96)
*/

static void dttstat(Dtstat_t* ds, Dtlink_t* root, int depth, int* level)
{
        if(root->left)
                dttstat(ds,root->left,depth+1,level);
        if(root->right)
                dttstat(ds,root->right,depth+1,level);
        if(depth > ds->dt_n)
                ds->dt_n = depth;
        if(level)
                level[depth] += 1;
}

static void dthstat(reg Dtdata_t* data, Dtstat_t* ds, reg int* count)
{
        reg Dtlink_t*   t;
        reg int         n, h;

        for(h = data->ntab-1; h >= 0; --h)
        {       n = 0;
                for(t = data->htab[h]; t; t = t->right)
                        n += 1;
                if(count)
                        count[n] += 1;
                else if(n > 0)
                {       ds->dt_n += 1;
                        if(n > ds->dt_max)
                                ds->dt_max = n;
                }
        }
}

int dtstat(reg Dt_t* dt, Dtstat_t* ds, int all)
{
        reg int         i;
        static int      *Count, Size;

        UNFLATTEN(dt);

        ds->dt_n = ds->dt_max = 0;
        ds->dt_count = NIL(int*);
        ds->dt_size = dtsize(dt);
        ds->dt_meth = dt->data->type&DT_METHODS;

        if(!all)
                return 0;

        if(dt->data->type&(DT_SET|DT_BAG))
        {       dthstat(dt->data,ds,NIL(int*));
                if(ds->dt_max+1 > Size)
                {       if(Size > 0)
                                free(Count);
                        if(!(Count = (int*)malloc((ds->dt_max+1)*sizeof(int))) )
                                return -1;
                        Size = ds->dt_max+1;
                }
                for(i = ds->dt_max; i >= 0; --i)
                        Count[i] = 0;
                dthstat(dt->data,ds,Count);
        }
        else if(dt->data->type&(DT_OSET|DT_OBAG))
        {       if(dt->data->here)
                {       dttstat(ds,dt->data->here,0,NIL(int*));
                        if(ds->dt_n+1 > Size)
                        {       if(Size > 0)
                                        free(Count);
                                if(!(Count = (int*)malloc((ds->dt_n+1)*sizeof(int))) )
                                        return -1;
                                Size = ds->dt_n+1;
                        }

                        for(i = ds->dt_n; i >= 0; --i)
                                Count[i] = 0;
                        dttstat(ds,dt->data->here,0,Count);
                        for(i = ds->dt_n; i >= 0; --i)
                                if(Count[i] > ds->dt_max)
                                        ds->dt_max = Count[i];
                }
        }
        ds->dt_count = Count;

        return 0;
}