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/* Time internal interface
Copyright 2015-2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
/* This file is for Gnulib internal use only.
Applications should not use it. */
/* A time zone rule. */
struct tm_zone
{
/* More abbreviations, should they be needed. Their TZ_IS_SET
members are zero. */
struct tm_zone *next;
/* If nonzero, the rule represents the TZ environment variable set
to the first "abbreviation" (this may be the empty string).
Otherwise, it represents an unset TZ. */
char tz_is_set;
/* A sequence of null-terminated strings packed next to each other.
The strings are followed by an extra null byte. If TZ_IS_SET,
there must be at least one string and the first string (which is
actually a TZ environment value) may be empty. Otherwise all
strings must be nonempty.
Abbreviations are stored here even on platforms with tm_zone, because
otherwise tm_zone values would be dead after changing TZ and calling
tzset. Abbreviations never move once allocated, and are live
until tzfree is called. */
char abbrs[FLEXIBLE_ARRAY_MEMBER];
};
timezone_t set_tz (timezone_t);
bool revert_tz (timezone_t);
/* Magic cookie timezone_t value, for local time. It differs from
NULL and from all other timezone_t values. Only the address
matters; the pointer is never dereferenced. */
#define local_tz ((timezone_t) 1)
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