Author: Gerd Isenberg
Date: 13:17:47 07/04/03
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On July 04, 2003 at 13:56:09, Normand M. Blais wrote:
>// This function runs fine (with or without optimization).
>inline int s2i(const char *str)
>{
> // input: a square name (string) (ex: e4)
> // output: a square number (integer) (ex: 36)
>
> int sq = (str[0] - 'a') + (8 * (8 - (str[1] - '0')));
Another possible trap, if the coordinate string may be "empty".
In this case "str" is the valid address of the terminator, but "str[1]" may
already be outside a 4KByte page and an access violation occurs on some
processors (x86 in regular protected mode).
Gerd
>
> if (sq >= 0 && sq <= 63) return sq;
>
> return -1;
>}
>
>
>Why the first version of the function causes problem is not clear to me. Anyway.
>I felt that it is fare for me to share this information taking into account that
>I benefit greatly from others.
>
>Thank you,
>
>Normand
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