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with memset() instead of = {}, and move TT.alarm to local variable.
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I'd put the rtc_wkalarm struct in the globals to get it zeroed for
free, but since there's no such type on macOS, that breaks the
build. Rather than define a bogus struct in portability.h, I've
gone for making it an explicitly-zeroed local. (And I've sorted the
locals largest-first.)
Note that the use of struct rtc_time as if it was the same as struct
tm in this code follows the existing code in hwclock, but I worry
that we're going to have trouble with that because of the extra
tm_gmtoff and tm_zone fields in struct tm. But that's a worry for
another day...
This patch also removes the CONFIG_CP_PRESERVE from the macos_miniconfig,
since that option was removed a while back.
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Some of the bringup folks are debugging RTC issues and asked for this.
Rather than duplicate the weird xtzset dance with mktime, I've factored
that out into a new xmktime that takes a boolean for whether to use UTC
or local time.
Otherwise, the slight cleanup of hwclock.c is entirely optional. The
only functional change there is that util-linux 2.34's hwclock uses ISO
time format, which is the usual toybox preference anyway, so I've
switched it over to that rather than ctime(3).
Bug: http://b/152042947
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