Add rtcwake.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/lib.h b/lib/lib.h
index 66b39d67..c528f190 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -188,6 +188,7 @@ void xsignal(int signal, void *handler);
 time_t xvali_date(struct tm *tm, char *str);
 void xparsedate(char *str, time_t *t, unsigned *nano, int endian);
 char *xgetline(FILE *fp, int *len);
+time_t xmktime(struct tm *tm, int utc);
 
 // lib.c
 void verror_msg(char *msg, int err, va_list va);