1 /* Time internal interface
2
3 Copyright 2015-2023 Free Software Foundation, Inc.
4
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation, either version 3 of the
8 License, or (at your option) any later version.
9
10 This file is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 /* Written by Paul Eggert. */
19
20 /* A time zone rule. */
21 struct tm_zone
22 {
23 /* More abbreviations, should they be needed. Their TZ_IS_SET
24 members are zero. */
25 struct tm_zone *next;
26
27 #if HAVE_TZNAME && !HAVE_STRUCT_TM_TM_ZONE
28 /* Copies of recent strings taken from tzname[0] and tzname[1].
29 The copies are in ABBRS, so that they survive tzset. Null if unknown. */
30 char *tzname_copy[2];
31 #endif
32
33 /* If nonzero, the rule represents the TZ environment variable set
34 to the first "abbreviation" (this may be the empty string).
35 Otherwise, it represents an unset TZ. */
36 char tz_is_set;
37
38 /* A sequence of null-terminated strings packed next to each other.
39 The strings are followed by an extra null byte. If TZ_IS_SET,
40 there must be at least one string and the first string (which is
41 actually a TZ environment value) may be empty. Otherwise all
42 strings must be nonempty.
43
44 Abbreviations are stored here because otherwise the values of
45 tm_zone and/or tzname would be dead after changing TZ and calling
46 tzset. Abbreviations never move once allocated, and are live
47 until tzfree is called. */
48 char abbrs[FLEXIBLE_ARRAY_MEMBER];
49 };