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fattime: fix fattime to timespec conversion of dates beyond 2106-02-06
It turns out that the only conversion issue was in fattime2timespec, where multiplying the number of seconds in a day by the number of days overflowed 32-bit unsigned int for dates beyond 2106-02-07 06:28:15. Casting one of the multiplicands as time_t forces a 64-bit multiplication on systems where time_t is 64-bits and produces no binary changes on the one remaining system with 32-bit time_t (namely i386). Since the code is now tested & fixed, this change removes the fixme comments. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D44755
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@ -63,11 +63,6 @@
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* FAT timestamps have 7 bits for the year and starts at 1980, so
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* they can represent up to 2107 which means that the non-leap-year
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* 2100 must be handled.
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*
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* XXX: As long as time_t is 32 bits this is not relevant or easily
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* XXX: testable. Revisit when time_t grows bigger.
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* XXX: grepfodder: 64 bit time_t, y2100, y2.1k, 2100, leap year
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*
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*/
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#include <sys/param.h>
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@ -165,10 +160,7 @@ timespec2fattime(const struct timespec *tsp, int utc, uint16_t *ddp,
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} else {
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t2 -= T1980;
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/*
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* 2100 is not a leap year.
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* XXX: a 32 bit time_t can not get us here.
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*/
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/* 2100 is not a leap year */
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if (t2 >= ((2100 - 1980) / 4 * LYC + FEB))
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t2++;
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@ -242,17 +234,14 @@ fattime2timespec(unsigned dd, unsigned dt, unsigned dh, int utc,
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/* Month offset from leap-year cycle */
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day += daytab[(dd >> 5) & 0x3f];
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/*
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* 2100 is not a leap year.
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* XXX: a 32 bit time_t can not get us here.
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*/
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/* 2100 is not a leap year */
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if (day >= ((2100 - 1980) / 4 * LYC + FEB))
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day--;
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/* Align with time_t epoch */
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day += T1980;
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tsp->tv_sec += DAY * day;
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tsp->tv_sec += (time_t) DAY * day;
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if (!utc)
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tsp->tv_sec += utc_offset();
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}
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