mapping single-key input devices to buttons

[Johannes Berg]

On Sat, 2006-04-29 at 00:25 +0200, Johannes Berg wrote:
 
> -#define test_bit(bit, array) (array[(bit) / 8] & (1 << ((bit) % 8)))
> +/* we must use this kernel-compatible implementation */
> +#define BITS_PER_LONG (sizeof(long) * 8)
> +#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
> +#define OFF(x)  ((x)%BITS_PER_LONG)
> +#define BIT(x)  (1UL<<OFF(x))
> +#define LONG(x) ((x)/BITS_PER_LONG)
> +#define test_bit(bit, array)    ((array[LONG(bit)] >> OFF(bit)) & 1)

Come to think of it, the original was of course correct on little-endian
platforms due to byte ordering. Grr! Sometimes I feel like a
second-class citizen...

johannes
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