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Support tz databases from release 2023d and newer by adding new zonenow.tab file to ignore list

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date's internal init_tzdb function iterates through the files provided
by the tz database, and init_tzdb contains a list of files that should
not be interpreted as being in TZif format.

The 2023d release of the tz database added a new file that is not in
TZif format, zonenow.tab. However, this file had not been added to the
ignore list.

This caused date to intepret the zonenow.tab file as a TZif file,
which caused assertions to fire in debug mode if the user attempted to
load its associated time_zone, causing load_header() to be invoked
on the file, which would find that it did not contain a 'TZif' magic
number.

This commit addresses the issue by adding the file to the ignore list.

The announcement on the tz database mailing list which describes the
addition of zonenow.tab can be found at this link:

https://mm.icann.org/pipermail/tz-announce/2023-December/000080.html
This commit is contained in:
Edward Nolan 2024-05-31 12:28:13 -04:00 committed by Howard Hinnant
parent 939031c38c
commit 6219dd7e4d
1 changed files with 1 additions and 0 deletions
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src/tz.cpp
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@ -2911,6 +2911,7 @@ init_tzdb()
strcmp(d->d_name, "version") == 0 ||
strcmp(d->d_name, "zone.tab") == 0 ||
strcmp(d->d_name, "zone1970.tab") == 0 ||
strcmp(d->d_name, "zonenow.tab") == 0 ||
strcmp(d->d_name, "tzdata.zi") == 0 ||
strcmp(d->d_name, "leapseconds") == 0 ||
strcmp(d->d_name, "leap-seconds.list") == 0 )