2016-03-03 13:28+0100, Laurent Vivier:
> By starting with get-time-of-day, set-time-of-day.
>
> Signed-off-by: Laurent Vivier <lvivier@xxxxxxxxxx>
> ---
> diff --git a/powerpc/rtas.c b/powerpc/rtas.c
> +#define DAYS(y,m,d) (365UL * (y) + ((y) / 4) - ((y) / 100) + ((y) / 400) + \
> + 367UL * (m) / 12 + \
> + (d))
This function is hard to (re)use.
What about putting the "month -= 2" block together with DAYS to give a
better estimate of the amount of days in the gregorian calendar?
static inline unsigned long days(int year, int month, int day) {
month -= 2;
if (month <= 0) {
month += 12;
year -= 1;
}
return DAYS(year, month, day);
}
(Or replacing it with an obvious, but slower/bigger implementation? :])
> + /* Put February at end of the year to avoid leap day this year */
> +
> + month -= 2;
> + if (month <= 0) {
> + month += 12;
> + year -= 1;
> + }
> +
> + /* compute epoch: substract DAYS(since_March(1-1-1970)) */
> +
> + epoch = DAYS(year, month, day) - DAYS(1969, 11, 1);
You'd then be able to write
epoch = days(year, month, day) - days(1970, 1, 1);
instead of the obscure chunk of code.
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