================
@@ -655,6 +655,57 @@ void __init_tzdb(tzdb& __tzdb, __tz::__rules_storage_type&
__rules) {
std::ranges::sort(__tzdb.leap_seconds);
}
+#ifdef _WIN32
+[[nodiscard]] static const time_zone* __current_zone_windows(const tzdb& tzdb)
{
+ // TODO TZDB Implement this on Windows.
+ std::__throw_runtime_error("unknown time zone");
+}
+#else // ifdef _WIN32
+[[nodiscard]] static const time_zone* __current_zone_posix(const tzdb& tzdb) {
+ // On POSIX systems there are several ways to configure the time zone.
+ // In order of priority they are:
+ // - TZ environment variable
+ //
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08
+ // The documentation is unclear whether or not it's allowed to
+ // change time zone information. For example the TZ string
+ // MST7MDT
+ // this is an entry in tzdata.zi. The value
+ // MST
+ // is also an entry. Is it allowed to use the following?
+ // MST-3
+ // Even when this is valid there is no time_zone record in the
+ // database. Since the library would need to return a valid pointer,
+ // this means the library needs to allocate and leak a pointer.
+ //
+ // - The time zone name is the target of the symlink /etc/localtime
+ // relative to /usr/share/zoneinfo/
+
+ // The algorithm is like this:
+ // - If the environment variable TZ is set and points to a valid
+ // record use this value.
+ // - Else use the timezone name.
+
+ if (const char* __tz = getenv("TZ"))
+ if (const time_zone* __result = tzdb.__locate_zone(__tz))
+ return __result;
+
+ filesystem::path __path = "/etc/localtime";
+ if (!std::filesystem::exists(__path))
+ std::__throw_runtime_error("the symlink '/etc/localtime' does not exist");
----------------
ldionne wrote:
```suggestion
std::__throw_runtime_error("tzdb: the symlink '/etc/localtime' does not
exist");
```
https://github.com/llvm/llvm-project/pull/82157
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