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date.c: abort if the system time cannot handle one of our timestamps

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We are about to switch to a new data type for time stamps that is
definitely not smaller or equal, but larger or equal to time_t.

So before using the system functions to process or format timestamps,
let's make extra certain that they can handle what we feed them.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2017-04-26 21:29:36 +02:00 committed by Junio C Hamano
parent dddbad728c
commit 1e65a982da
1 changed files with 15 additions and 2 deletions
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17
date.c
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@ -46,7 +46,17 @@ static time_t gm_time_t(timestamp_t time, int tz)
minutes = tz < 0 ? -tz : tz;
minutes = (minutes / 100)*60 + (minutes % 100);
minutes = tz < 0 ? -minutes : minutes;
return time + minutes * 60;
if (minutes > 0) {
if (unsigned_add_overflows(time, minutes * 60))
die("Timestamp+tz too large: %"PRItime" +%04d",
time, tz);
} else if (time < -minutes * 60)
die("Timestamp before Unix epoch: %"PRItime" %04d", time, tz);
time += minutes * 60;
if (date_overflows(time))
die("Timestamp too large for this system: %"PRItime, time);
return (time_t)time;
}
/*
@ -70,7 +80,10 @@ static int local_tzoffset(timestamp_t time)
struct tm tm;
int offset, eastwest;
t = time;
if (date_overflows(time))
die("Timestamp too large for this system: %"PRItime, time);
t = (time_t)time;
localtime_r(&t, &tm);
t_local = tm_to_time_t(&tm);