Add common code to support realtime clocks that store year without century.
Most realtime clocks store the year as 2 BCD digits. Some add a century bit to extend the range another hundred years. Every clock driver has its own code to determine the century and pass a full year value to clock_ct_to_ts(). Now clock drivers can just convert BCD to bin and store the result in the clocktime struct and let the common code figure out the century. Clocks with a century bit can just add 100 to year if the century bit is on.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=321400
@ -142,18 +142,27 @@ clock_ct_to_ts(struct clocktime *ct, struct timespec *ts)
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{
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int i, year, days;
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year = ct->year;
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if (ct_debug) {
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printf("ct_to_ts(");
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print_ct(ct);
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printf(")");
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}
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/*
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* Many realtime clocks store the year as 2-digit BCD; pivot on 70 to
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* determine century. Some clocks have a "century bit" and drivers do
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* year += 100, so interpret values between 70-199 as relative to 1900.
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*/
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year = ct->year;
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if (year < 70)
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year += 2000;
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else if (year < 200)
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year += 1900;
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/* Sanity checks. */
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if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 ||
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ct->day > days_in_month(year, ct->mon) ||
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ct->hour > 23 || ct->min > 59 || ct->sec > 59 ||
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ct->hour > 23 || ct->min > 59 || ct->sec > 59 || year < 1970 ||
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(sizeof(time_t) == 4 && year > 2037)) { /* time_t overflow */
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if (ct_debug)
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printf(" = EINVAL\n");
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