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calendarspec: fix possibly skips next elapse
If the time unit changes after adding the repetition value, the timer may skip the next elapse. This patch reset sub time units to minimum value when upper unit is changed. Fixes #22665.
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@ -1181,6 +1181,7 @@ static int find_matching_component(
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static int tm_within_bounds(struct tm *tm, bool utc) {
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struct tm t;
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int cmp;
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assert(tm);
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/*
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@ -1195,13 +1196,25 @@ static int tm_within_bounds(struct tm *tm, bool utc) {
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if (mktime_or_timegm(&t, utc) < 0)
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return negative_errno();
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/* Did any normalization take place? If so, it was out of bounds before */
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int cmp = CMP(t.tm_year, tm->tm_year) ?:
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CMP(t.tm_mon, tm->tm_mon) ?:
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CMP(t.tm_mday, tm->tm_mday) ?:
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CMP(t.tm_hour, tm->tm_hour) ?:
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CMP(t.tm_min, tm->tm_min) ?:
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CMP(t.tm_sec, tm->tm_sec);
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/*
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* Did any normalization take place? If so, it was out of bounds before.
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* Normalization could skip next elapse, e.g. result of normalizing 3-33
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* is 4-2. This skips 4-1. So reset the sub time unit if upper unit was
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* out of bounds. Normalization has occurred implies find_matching_component() > 0,
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* other sub time units are already reset in find_next().
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*/
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if ((cmp = CMP(t.tm_year, tm->tm_year)) != 0)
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t.tm_mon = 0;
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else if ((cmp = CMP(t.tm_mon, tm->tm_mon)) != 0)
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t.tm_mday = 1;
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else if ((cmp = CMP(t.tm_mday, tm->tm_mday)) != 0)
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t.tm_hour = 0;
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else if ((cmp = CMP(t.tm_hour, tm->tm_hour)) != 0)
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t.tm_min = 0;
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else if ((cmp = CMP(t.tm_min, tm->tm_min)) != 0)
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t.tm_sec = 0;
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else
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cmp = CMP(t.tm_sec, tm->tm_sec);
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if (cmp < 0)
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return -EDEADLK; /* Refuse to go backward */
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@ -199,6 +199,8 @@ TEST(calendar_spec_next) {
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test_next("2016-02~01 UTC", "", 12345, 1456704000000000);
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test_next("Mon 2017-05~01..07 UTC", "", 12345, 1496016000000000);
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test_next("Mon 2017-05~07/1 UTC", "", 12345, 1496016000000000);
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test_next("*-*-01/5 04:00:00 UTC", "", 1646010000000000, 1646107200000000);
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test_next("*-01/7-01 04:00:00 UTC", "", 1664607600000000, 1672545600000000);
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test_next("2017-08-06 9,11,13,15,17:00 UTC", "", 1502029800000000, 1502031600000000);
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test_next("2017-08-06 9..17/2:00 UTC", "", 1502029800000000, 1502031600000000);
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test_next("2016-12-* 3..21/6:00 UTC", "", 1482613200000001, 1482634800000000);
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