Eric Sunshine <sunsh...@sunshineco.com> writes:
> Later parse_date_basic() computes the offset from GMT by comparing
> the values returned by tm_to_time_t() and mktime(). The existing 'tm'
> is passed to mktime() with the tm_isdst field already set to 0 by
> gmtime_r(), and mktime() respects that as a statement that DST is not
> in effect, rather than determining it dynamically.
>
> The fix seems to be simply:
>
> ---- >8 ----
> diff --git a/date.c b/date.c
> index 3eba2df..99ad2a0 100644
> --- a/date.c
> +++ b/date.c
> @@ -707,6 +707,7 @@ int parse_date_basic(const char *date, unsigned long
> *timestamp, int *offset)
> /* mktime uses local timezone */
> *timestamp = tm_to_time_t(&tm);
> if (*offset == -1) {
> + tm.tm_isdst = -1;
> time_t temp_time = mktime(&tm);
> if ((time_t)*timestamp > temp_time) {
> *offset = ((time_t)*timestamp - temp_time) / 60;
> ---- >8 ----
I briefly wondered if the caller of gmtime_r() in match_digit()
should be preserving the tm_isdst, though, as that codepath knows
that it is handling a bare number without GMT offset.
But resetting it to -1 here makes it even less error prone (we may
gain other code that stomp on tm.tm_isdst before we get here, and
having -1 in *offset is a sign that nobody saw GMT offset in the
input).
I think I see a decl-after-statment, but other than that, this looks
like a good fix.
Thanks.
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