diff options
Diffstat (limited to 'time/mktime.c')
| -rw-r--r-- | time/mktime.c | 44 |
1 files changed, 16 insertions, 28 deletions
diff --git a/time/mktime.c b/time/mktime.c index 6135d70bd6..2908db0784 100644 --- a/time/mktime.c +++ b/time/mktime.c @@ -350,44 +350,32 @@ __mktime_internal (tp, convert, offset) /* If we have a match, check whether tm.tm_isdst has the requested value, if any. */ - if (dt == 0 && isdst >= 0 && isdst != tm.tm_isdst) + if (dt == 0 && 0 <= isdst && 0 <= tm.tm_isdst) { int dst_diff = (isdst != 0) - (tm.tm_isdst != 0); if (dst_diff) { - /* Move three hours in the direction indicated by the disagreement, + /* Move two hours in the direction indicated by the disagreement, probe some more, and switch to a new time if found. The largest known fallback due to daylight savings is two hours: - once, in Newfoundland, 1988-10-30 02:00 -> 00:00. - But some programs (e.g. testsuites) probe for larger differences - between DST and normal time so switch by three hours. No - normal program does this so we do not account for more than - three hours difference. */ - time_t ot = t - 3 * 60 * 60 * dst_diff; - struct tm otm; - struct tm tmptm; - - otm.tm_isdst = -1; - + once, in Newfoundland, 1988-10-30 02:00 -> 00:00. */ + time_t ot = t - 2 * 60 * 60 * dst_diff; while (--remaining_probes != 0) { - if (! (dt = ydhms_tm_diff (year, yday, hour, min, sec, - ranged_convert (convert, &ot, - &tmptm))) - || tmptm.tm_isdst != isdst) - break; - - otm = tmptm; - ot += dt; - if (ot == t) + struct tm otm; + dt = ydhms_tm_diff (year, yday, hour, min, sec, + ranged_convert (convert, &ot, &otm)); + if (dt == 0 + || (ot + dt == t + && dst_diff == (isdst != 0) - (tm.tm_isdst != 0))) + { + t = ot; + tm = otm; + break; + } + if ((ot += dt) == t) break; /* Avoid a redundant probe. */ } - - if (otm.tm_isdst != -1) - { - t = ot; - tm = otm; - } } } |