Asymmetric Bounds

#define MAX_ADS 5
struct dr {            /* accumulated advertisements */
    [...]
    n_long  dr_pref;   /* preference adjusted by metric */
} *cur_drp, drs[MAX_ADS];
[...]
    struct dr *drp;
    [...]
    for (drp = drs; drp < &drs[MAX_ADS]; drp++) {
        drp->dr_recv_pref = 0;
        drp->dr_life = 0;
    }

In the code above drs (the lower bound) is the first element of the array; drs[MAX_ADS] (the upper bound) the first element outside the array.

When using asymmetric bounds:

Number of elements is equal to the difference between upper and lower bound.
When upper bound equals lower bound the range is empty.
The lower bound is the first occupied element.
The upper bound is the first free element.

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