If i have a fixed size char array of padded ascii digits which I know refers to an unsigned integer, what is the fastest way to convert it to such?
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Suppose I have a `char buf[12];` which I know will always have a right justified unsigned number padded on the left with spaces. So, for example: `_________329` (where the `_` stands for space). The fastest way I can think of parsing it is with something like this:

    while (*buf == ' ') buf++;
    atoi(buf);

but I was wondering if there was a faster way, particularly with `atoi` given that we know it is unsigned which `atoi` does not assume..
