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# 232aabb5452d oxygen / vendor / iana-time-zone / src / ffi_utils.rs
19.5 KiB · Rust · last changed Strata: the cloud stores send through ureq, so every release target links 1 month ago source blame history raw
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//! Cross platform FFI helpers.
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#[cfg(any(test, target_os = "android"))]
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use std::ffi::CStr;
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/// A buffer to store the timezone name when calling the C API.
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#[cfg(any(test, target_vendor = "apple", target_env = "ohos"))]
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pub(crate) mod buffer {
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    /// The longest name in the IANA time zone database is 32 ASCII characters long.
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    pub const MAX_LEN: usize = 64;
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    /// Return a buffer to store the timezone name.
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    ///
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    /// The buffer is used to store the timezone name when calling the C API.
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    pub const fn tzname_buf() -> [u8; MAX_LEN] {
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        [0; MAX_LEN]
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    }
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}
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// The system property named 'persist.sys.timezone' contains the name of the
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// current timezone.
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//
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// From https://android.googlesource.com/platform/bionic/+/gingerbread-release/libc/docs/OVERVIEW.TXT#79:
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//
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// > The name of the current timezone is taken from the TZ environment variable,
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// > if defined. Otherwise, the system property named 'persist.sys.timezone' is
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// > checked instead.
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//
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// TODO: Use a `c"..."` literal when MSRV is upgraded beyond 1.77.0.
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// https://doc.rust-lang.org/edition-guide/rust-2021/c-string-literals.html
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#[cfg(any(test, target_os = "android"))]
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const ANDROID_TIMEZONE_PROPERTY_NAME: &[u8] = b"persist.sys.timezone\0";
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/// Return a [`CStr`] to access the timezone from an Android system properties
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/// environment.
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#[cfg(any(test, target_os = "android"))]
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pub(crate) fn android_timezone_property_name() -> &'static CStr {
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    // In tests or debug mode, opt into extra runtime checks.
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    if cfg!(any(test, debug_assertions)) {
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        return CStr::from_bytes_with_nul(ANDROID_TIMEZONE_PROPERTY_NAME).unwrap();
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    }
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    // SAFETY: the key is NUL-terminated and there are no other NULs, this
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    // invariant is checked in tests.
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    unsafe { CStr::from_bytes_with_nul_unchecked(ANDROID_TIMEZONE_PROPERTY_NAME) }
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}
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#[cfg(test)]
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mod tests {
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    use core::mem::size_of_val;
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    use std::ffi::CStr;
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    use super::buffer::{tzname_buf, MAX_LEN};
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    use super::{android_timezone_property_name, ANDROID_TIMEZONE_PROPERTY_NAME};
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    #[test]
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    fn test_android_timezone_property_name_is_valid_cstr() {
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        CStr::from_bytes_with_nul(ANDROID_TIMEZONE_PROPERTY_NAME).unwrap();
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        let mut invalid_property_name = ANDROID_TIMEZONE_PROPERTY_NAME.to_owned();
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        invalid_property_name.push(b'\0');
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        CStr::from_bytes_with_nul(&invalid_property_name).unwrap_err();
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    }
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    #[test]
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    fn test_android_timezone_property_name_getter() {
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        let key = android_timezone_property_name().to_bytes_with_nul();
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        assert_eq!(key, ANDROID_TIMEZONE_PROPERTY_NAME);
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        std::str::from_utf8(key).unwrap();
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    }
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    /// An exhaustive set of IANA timezone names for testing.
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    ///
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    /// Pulled from Wikipedia as of Sat March 22, 2025:
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    ///
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    /// - <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>
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    /// - <https://en.wikipedia.org/w/index.php?title=List_of_tz_database_time_zones&oldid=1281103182>
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    static KNOWN_TIMEZONE_NAMES: &[&str] = &[
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        "Africa/Abidjan",
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        "Africa/Accra",
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        "Africa/Addis_Ababa",
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        "Africa/Algiers",
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        "Africa/Asmara",
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        "Africa/Asmera",
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        "Africa/Bamako",
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        "Africa/Bangui",
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        "Africa/Banjul",
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        "Africa/Bissau",
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        "Africa/Blantyre",
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        "Africa/Brazzaville",
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        "Africa/Bujumbura",
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        "Africa/Cairo",
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        "Africa/Casablanca",
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        "Africa/Conakry",
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        "Africa/Dakar",
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        "Africa/Dar_es_Salaam",
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        "Africa/Djibouti",
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        "Africa/Douala",
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        "Africa/El_Aaiun",
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        "Africa/Freetown",
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        "Africa/Gaborone",
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        "Africa/Harare",
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        "Africa/Johannesburg",
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        "Africa/Juba",
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        "Africa/Kampala",
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        "Africa/Khartoum",
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        "Africa/Kigali",
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        "Africa/Libreville",
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        "Africa/Lome",
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        "Africa/Luanda",
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        "Africa/Lusaka",
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        "Africa/Malabo",
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        "Africa/Maseru",
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        "Africa/Mbabane",
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        "Africa/Mogadishu",
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        "Africa/Monrovia",
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        "Africa/Nairobi",
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        "Africa/Ndjamena",
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        "Africa/Niamey",
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        "Africa/Nouakchott",
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        "Africa/Ouagadougou",
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        "Africa/Porto-Novo",
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        "Africa/Sao_Tome",
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        "Africa/Timbuktu",
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        "Africa/Tripoli",
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        "Africa/Tunis",
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        "Africa/Windhoek",
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        "America/Anguilla",
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        "America/Antigua",
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        "America/Argentina/ComodRivadavia",
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        "America/Aruba",
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        "America/Asuncion",
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        "America/Atka",
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        "America/Barbados",
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        "America/Belize",
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        "America/Bogota",
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        "America/Buenos_Aires",
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        "America/Caracas",
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        "America/Catamarca",
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        "America/Cayenne",
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        "America/Cayman",
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        "America/Coral_Harbour",
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        "America/Cordoba",
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        "America/Costa_Rica",
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        "America/Curacao",
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        "America/Dominica",
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        "America/El_Salvador",
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        "America/Ensenada",
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        "America/Fort_Wayne",
150 
        "America/Godthab",
151 
        "America/Grand_Turk",
152 
        "America/Grenada",
153 
        "America/Guadeloupe",
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        "America/Guatemala",
155 
        "America/Guyana",
156 
        "America/Havana",
157 
        "America/Indianapolis",
158 
        "America/Jamaica",
159 
        "America/Jujuy",
160 
        "America/Knox_IN",
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        "America/Kralendijk",
162 
        "America/La_Paz",
163 
        "America/Lima",
164 
        "America/Louisville",
165 
        "America/Lower_Princes",
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        "America/Managua",
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        "America/Marigot",
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        "America/Martinique",
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        "America/Mendoza",
170 
        "America/Miquelon",
171 
        "America/Montevideo",
172 
        "America/Montreal",
173 
        "America/Montserrat",
174 
        "America/Nassau",
175 
        "America/Nipigon",
176 
        "America/Pangnirtung",
177 
        "America/Paramaribo",
178 
        "America/Port-au-Prince",
179 
        "America/Port_of_Spain",
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        "America/Porto_Acre",
181 
        "America/Rainy_River",
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        "America/Rosario",
183 
        "America/Santa_Isabel",
184 
        "America/Santo_Domingo",
185 
        "America/Shiprock",
186 
        "America/St_Barthelemy",
187 
        "America/St_Kitts",
188 
        "America/St_Lucia",
189 
        "America/St_Thomas",
190 
        "America/St_Vincent",
191 
        "America/Tegucigalpa",
192 
        "America/Thunder_Bay",
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        "America/Tortola",
194 
        "America/Virgin",
195 
        "America/Yellowknife",
196 
        "Antarctica/South_Pole",
197 
        "Arctic/Longyearbyen",
198 
        "Asia/Aden",
199 
        "Asia/Amman",
200 
        "Asia/Ashgabat",
201 
        "Asia/Ashkhabad",
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        "Asia/Baghdad",
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        "Asia/Bahrain",
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        "Asia/Baku",
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        "Asia/Beirut",
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        "Asia/Bishkek",
207 
        "Asia/Brunei",
208 
        "Asia/Calcutta",
209 
        "Asia/Choibalsan",
210 
        "Asia/Chongqing",
211 
        "Asia/Chungking",
212 
        "Asia/Colombo",
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        "Asia/Dacca",
214 
        "Asia/Damascus",
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        "Asia/Dhaka",
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        "Asia/Dili",
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        "Asia/Dushanbe",
218 
        "Asia/Harbin",
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        "Asia/Hong_Kong",
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        "Asia/Istanbul",
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        "Asia/Jerusalem",
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        "Asia/Kabul",
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        "Asia/Karachi",
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        "Asia/Kashgar",
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        "Asia/Kathmandu",
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        "Asia/Katmandu",
227 
        "Asia/Kolkata",
228 
        "Asia/Kuwait",
229 
        "Asia/Macao",
230 
        "Asia/Macau",
231 
        "Asia/Manila",
232 
        "Asia/Muscat",
233 
        "Asia/Phnom_Penh",
234 
        "Asia/Pyongyang",
235 
        "Asia/Qatar",
236 
        "Asia/Rangoon",
237 
        "Asia/Saigon",
238 
        "Asia/Seoul",
239 
        "Asia/Taipei",
240 
        "Asia/Tbilisi",
241 
        "Asia/Tehran",
242 
        "Asia/Tel_Aviv",
243 
        "Asia/Thimbu",
244 
        "Asia/Thimphu",
245 
        "Asia/Ujung_Pandang",
246 
        "Asia/Ulan_Bator",
247 
        "Asia/Vientiane",
248 
        "Asia/Yangon",
249 
        "Asia/Yerevan",
250 
        "Atlantic/Bermuda",
251 
        "Atlantic/Cape_Verde",
252 
        "Atlantic/Faeroe",
253 
        "Atlantic/Faroe",
254 
        "Atlantic/Jan_Mayen",
255 
        "Atlantic/Reykjavik",
256 
        "Atlantic/South_Georgia",
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        "Atlantic/St_Helena",
258 
        "Atlantic/Stanley",
259 
        "Australia/ACT",
260 
        "Australia/Canberra",
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        "Australia/Currie",
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        "Australia/LHI",
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        "Australia/North",
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        "Australia/NSW",
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        "Australia/Queensland",
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        "Australia/South",
267 
        "Australia/Tasmania",
268 
        "Australia/Victoria",
269 
        "Australia/West",
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        "Australia/Yancowinna",
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        "Brazil/Acre",
272 
        "Brazil/DeNoronha",
273 
        "Brazil/East",
274 
        "Brazil/West",
275 
        "Canada/Atlantic",
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        "Canada/Central",
277 
        "Canada/Eastern",
278 
        "Canada/Mountain",
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        "Canada/Newfoundland",
280 
        "Canada/Pacific",
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        "Canada/Saskatchewan",
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        "Canada/Yukon",
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        "CET",
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        "Chile/Continental",
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        "Chile/EasterIsland",
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        "CST6CDT",
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        "Cuba",
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        "EET",
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        "Egypt",
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        "Eire",
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        "EST",
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        "EST5EDT",
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        "Etc/GMT",
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        "Etc/GMT+0",
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        "Etc/GMT+1",
296 
        "Etc/GMT+10",
297 
        "Etc/GMT+11",
298 
        "Etc/GMT+12",
299 
        "Etc/GMT+2",
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        "Etc/GMT+3",
301 
        "Etc/GMT+4",
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        "Etc/GMT+5",
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        "Etc/GMT+6",
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        "Etc/GMT+7",
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        "Etc/GMT+8",
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        "Etc/GMT+9",
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        "Etc/GMT-0",
308 
        "Etc/GMT-1",
309 
        "Etc/GMT-10",
310 
        "Etc/GMT-11",
311 
        "Etc/GMT-12",
312 
        "Etc/GMT-13",
313 
        "Etc/GMT-14",
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        "Etc/GMT-2",
315 
        "Etc/GMT-3",
316 
        "Etc/GMT-4",
317 
        "Etc/GMT-5",
318 
        "Etc/GMT-6",
319 
        "Etc/GMT-7",
320 
        "Etc/GMT-8",
321 
        "Etc/GMT-9",
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        "Etc/GMT0",
323 
        "Etc/Greenwich",
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        "Etc/UCT",
325 
        "Etc/Universal",
326 
        "Etc/UTC",
327 
        "Etc/Zulu",
328 
        "Europe/Amsterdam",
329 
        "Europe/Andorra",
330 
        "Europe/Athens",
331 
        "Europe/Belfast",
332 
        "Europe/Belgrade",
333 
        "Europe/Bratislava",
334 
        "Europe/Brussels",
335 
        "Europe/Bucharest",
336 
        "Europe/Budapest",
337 
        "Europe/Chisinau",
338 
        "Europe/Copenhagen",
339 
        "Europe/Dublin",
340 
        "Europe/Gibraltar",
341 
        "Europe/Guernsey",
342 
        "Europe/Helsinki",
343 
        "Europe/Isle_of_Man",
344 
        "Europe/Istanbul",
345 
        "Europe/Jersey",
346 
        "Europe/Kiev",
347 
        "Europe/Ljubljana",
348 
        "Europe/London",
349 
        "Europe/Luxembourg",
350 
        "Europe/Malta",
351 
        "Europe/Mariehamn",
352 
        "Europe/Minsk",
353 
        "Europe/Monaco",
354 
        "Europe/Nicosia",
355 
        "Europe/Oslo",
356 
        "Europe/Paris",
357 
        "Europe/Podgorica",
358 
        "Europe/Prague",
359 
        "Europe/Riga",
360 
        "Europe/Rome",
361 
        "Europe/San_Marino",
362 
        "Europe/Sarajevo",
363 
        "Europe/Skopje",
364 
        "Europe/Sofia",
365 
        "Europe/Stockholm",
366 
        "Europe/Tallinn",
367 
        "Europe/Tirane",
368 
        "Europe/Tiraspol",
369 
        "Europe/Uzhgorod",
370 
        "Europe/Vaduz",
371 
        "Europe/Vatican",
372 
        "Europe/Vienna",
373 
        "Europe/Vilnius",
374 
        "Europe/Warsaw",
375 
        "Europe/Zagreb",
376 
        "Europe/Zaporozhye",
377 
        "Factory",
378 
        "GB",
379 
        "GB-Eire",
380 
        "GMT",
381 
        "GMT+0",
382 
        "GMT-0",
383 
        "GMT0",
384 
        "Greenwich",
385 
        "Hongkong",
386 
        "HST",
387 
        "Iceland",
388 
        "Indian/Antananarivo",
389 
        "Indian/Chagos",
390 
        "Indian/Christmas",
391 
        "Indian/Cocos",
392 
        "Indian/Comoro",
393 
        "Indian/Kerguelen",
394 
        "Indian/Mahe",
395 
        "Indian/Mauritius",
396 
        "Indian/Mayotte",
397 
        "Indian/Reunion",
398 
        "Iran",
399 
        "Israel",
400 
        "Jamaica",
401 
        "Japan",
402 
        "Kwajalein",
403 
        "Libya",
404 
        "MET",
405 
        "Mexico/BajaNorte",
406 
        "Mexico/BajaSur",
407 
        "Mexico/General",
408 
        "MST",
409 
        "MST7MDT",
410 
        "Navajo",
411 
        "NZ",
412 
        "NZ-CHAT",
413 
        "Pacific/Apia",
414 
        "Pacific/Efate",
415 
        "Pacific/Enderbury",
416 
        "Pacific/Fakaofo",
417 
        "Pacific/Fiji",
418 
        "Pacific/Funafuti",
419 
        "Pacific/Guam",
420 
        "Pacific/Johnston",
421 
        "Pacific/Nauru",
422 
        "Pacific/Niue",
423 
        "Pacific/Norfolk",
424 
        "Pacific/Noumea",
425 
        "Pacific/Palau",
426 
        "Pacific/Pitcairn",
427 
        "Pacific/Ponape",
428 
        "Pacific/Rarotonga",
429 
        "Pacific/Saipan",
430 
        "Pacific/Samoa",
431 
        "Pacific/Tongatapu",
432 
        "Pacific/Truk",
433 
        "Pacific/Wallis",
434 
        "Pacific/Yap",
435 
        "Poland",
436 
        "Portugal",
437 
        "PRC",
438 
        "PST8PDT",
439 
        "ROC",
440 
        "ROK",
441 
        "Singapore",
442 
        "Turkey",
443 
        "UCT",
444 
        "Universal",
445 
        "US/Alaska",
446 
        "US/Aleutian",
447 
        "US/Arizona",
448 
        "US/Central",
449 
        "US/East-Indiana",
450 
        "US/Eastern",
451 
        "US/Hawaii",
452 
        "US/Indiana-Starke",
453 
        "US/Michigan",
454 
        "US/Mountain",
455 
        "US/Pacific",
456 
        "US/Samoa",
457 
        "UTC",
458 
        "W-SU",
459 
        "WET",
460 
        "Zulu",
461 
        "America/Rio_Branco",
462 
        "America/Maceio",
463 
        "America/Metlakatla",
464 
        "America/Juneau",
465 
        "America/Sitka",
466 
        "America/Adak",
467 
        "America/Yakutat",
468 
        "America/Anchorage",
469 
        "America/Nome",
470 
        "America/Manaus",
471 
        "America/Eirunepe",
472 
        "Asia/Aqtobe",
473 
        "America/Blanc-Sablon",
474 
        "America/Puerto_Rico",
475 
        "America/Goose_Bay",
476 
        "America/Moncton",
477 
        "America/Glace_Bay",
478 
        "America/Halifax",
479 
        "America/Noronha",
480 
        "Asia/Atyrau",
481 
        "Atlantic/Azores",
482 
        "America/Bahia",
483 
        "America/Bahia_Banderas",
484 
        "America/Tijuana",
485 
        "America/Mazatlan",
486 
        "Asia/Hovd",
487 
        "Asia/Shanghai",
488 
        "Asia/Makassar",
489 
        "Asia/Pontianak",
490 
        "Pacific/Bougainville",
491 
        "America/Fortaleza",
492 
        "America/Sao_Paulo",
493 
        "America/Argentina/Buenos_Aires",
494 
        "Europe/Busingen",
495 
        "Europe/Zurich",
496 
        "America/Merida",
497 
        "Atlantic/Canary",
498 
        "Antarctica/Casey",
499 
        "America/Argentina/Catamarca",
500 
        "America/Indiana/Tell_City",
501 
        "America/Indiana/Knox",
502 
        "America/Menominee",
503 
        "America/North_Dakota/Beulah",
504 
        "America/North_Dakota/New_Salem",
505 
        "America/North_Dakota/Center",
506 
        "America/Rankin_Inlet",
507 
        "America/Resolute",
508 
        "America/Winnipeg",
509 
        "America/Chicago",
510 
        "Africa/Maputo",
511 
        "America/Mexico_City",
512 
        "Africa/Ceuta",
513 
        "Pacific/Chatham",
514 
        "America/Chihuahua",
515 
        "America/Ojinaga",
516 
        "America/Ciudad_Juarez",
517 
        "Pacific/Chuuk",
518 
        "America/Matamoros",
519 
        "Europe/Simferopol",
520 
        "Asia/Dubai",
521 
        "America/Swift_Current",
522 
        "America/Regina",
523 
        "Antarctica/Davis",
524 
        "Africa/Lubumbashi",
525 
        "Africa/Kinshasa",
526 
        "Antarctica/DumontDUrville",
527 
        "America/Monterrey",
528 
        "Pacific/Easter",
529 
        "America/Indiana/Marengo",
530 
        "America/Indiana/Vincennes",
531 
        "America/Indiana/Indianapolis",
532 
        "America/Indiana/Petersburg",
533 
        "America/Indiana/Winamac",
534 
        "America/Indiana/Vevay",
535 
        "America/Kentucky/Louisville",
536 
        "America/Kentucky/Monticello",
537 
        "America/Detroit",
538 
        "America/Iqaluit",
539 
        "America/Toronto",
540 
        "America/New_York",
541 
        "America/Guayaquil",
542 
        "America/Atikokan",
543 
        "America/Panama",
544 
        "Asia/Tokyo",
545 
        "Pacific/Galapagos",
546 
        "Pacific/Gambier",
547 
        "Asia/Gaza",
548 
        "Pacific/Tarawa",
549 
        "Pacific/Honolulu",
550 
        "Asia/Jakarta",
551 
        "America/Argentina/Jujuy",
552 
        "Indian/Maldives",
553 
        "Pacific/Kosrae",
554 
        "Pacific/Kwajalein",
555 
        "America/Argentina/La_Rioja",
556 
        "Pacific/Kiritimati",
557 
        "Australia/Lord_Howe",
558 
        "Antarctica/Macquarie",
559 
        "Atlantic/Madeira",
560 
        "Asia/Kuala_Lumpur",
561 
        "Asia/Aqtau",
562 
        "Pacific/Marquesas",
563 
        "America/Cuiaba",
564 
        "America/Campo_Grande",
565 
        "Antarctica/Mawson",
566 
        "America/Argentina/Mendoza",
567 
        "Pacific/Pago_Pago",
568 
        "Pacific/Midway",
569 
        "America/Argentina/Cordoba",
570 
        "America/Santiago",
571 
        "Asia/Nicosia",
572 
        "Europe/Berlin",
573 
        "America/Nuuk",
574 
        "Asia/Almaty",
575 
        "Pacific/Majuro",
576 
        "Asia/Ulaanbaatar",
577 
        "Europe/Kyiv",
578 
        "America/Edmonton",
579 
        "America/Boise",
580 
        "America/Inuvik",
581 
        "America/Cambridge_Bay",
582 
        "America/Denver",
583 
        "Europe/Kaliningrad",
584 
        "Europe/Kirov",
585 
        "Europe/Moscow",
586 
        "Europe/Volgograd",
587 
        "Europe/Astrakhan",
588 
        "Europe/Samara",
589 
        "Europe/Saratov",
590 
        "Europe/Ulyanovsk",
591 
        "Asia/Yekaterinburg",
592 
        "Asia/Omsk",
593 
        "Asia/Barnaul",
594 
        "Asia/Novokuznetsk",
595 
        "Asia/Krasnoyarsk",
596 
        "Asia/Novosibirsk",
597 
        "Asia/Tomsk",
598 
        "Asia/Irkutsk",
599 
        "Asia/Yakutsk",
600 
        "Asia/Khandyga",
601 
        "Asia/Chita",
602 
        "Asia/Vladivostok",
603 
        "Asia/Ust-Nera",
604 
        "Asia/Magadan",
605 
        "Asia/Srednekolymsk",
606 
        "Asia/Sakhalin",
607 
        "Asia/Anadyr",
608 
        "Asia/Kamchatka",
609 
        "America/Phoenix",
610 
        "America/Creston",
611 
        "America/Dawson_Creek",
612 
        "America/Fort_Nelson",
613 
        "America/Whitehorse",
614 
        "America/Dawson",
615 
        "America/Danmarkshavn",
616 
        "Asia/Jayapura",
617 
        "Australia/Sydney",
618 
        "Australia/Broken_Hill",
619 
        "Pacific/Auckland",
620 
        "Antarctica/McMurdo",
621 
        "America/St_Johns",
622 
        "Asia/Bangkok",
623 
        "Asia/Famagusta",
624 
        "Australia/Darwin",
625 
        "America/Los_Angeles",
626 
        "America/Vancouver",
627 
        "Antarctica/Palmer",
628 
        "Pacific/Port_Moresby",
629 
        "America/Belem",
630 
        "America/Santarem",
631 
        "Asia/Singapore",
632 
        "America/Recife",
633 
        "Pacific/Kanton",
634 
        "Pacific/Guadalcanal",
635 
        "Pacific/Pohnpei",
636 
        "Europe/Lisbon",
637 
        "Asia/Qostanay",
638 
        "Australia/Brisbane",
639 
        "Australia/Lindeman",
640 
        "America/Cancun",
641 
        "Asia/Qyzylorda",
642 
        "America/Punta_Arenas",
643 
        "America/Porto_Velho",
644 
        "America/Boa_Vista",
645 
        "Antarctica/Rothera",
646 
        "Asia/Kuching",
647 
        "America/Argentina/Salta",
648 
        "America/Argentina/San_Juan",
649 
        "America/Argentina/San_Luis",
650 
        "America/Argentina/Rio_Gallegos",
651 
        "America/Scoresbysund",
652 
        "Pacific/Tahiti",
653 
        "America/Hermosillo",
654 
        "Australia/Adelaide",
655 
        "Asia/Ho_Chi_Minh",
656 
        "Europe/Madrid",
657 
        "Antarctica/Syowa",
658 
        "Asia/Riyadh",
659 
        "Australia/Hobart",
660 
        "America/Thule",
661 
        "America/Argentina/Ushuaia",
662 
        "America/Araguaina",
663 
        "Antarctica/Troll",
664 
        "America/Argentina/Tucuman",
665 
        "Asia/Tashkent",
666 
        "Asia/Samarkand",
667 
        "Australia/Melbourne",
668 
        "Antarctica/Vostok",
669 
        "Pacific/Wake",
670 
        "Africa/Lagos",
671 
        "Asia/Hebron",
672 
        "Asia/Oral",
673 
        "Australia/Eucla",
674 
        "Australia/Perth",
675 
        "Asia/Urumqi",
676 
    ];
677
678 
    #[test]
679 
    fn test_tzname_buffer_fits_all_iana_names() {
680 
        let buf = tzname_buf();
681 
        let max_len = buf.len();
682
683 
        let mut failed_tz_names = vec![];
684
685 
        for &tz in KNOWN_TIMEZONE_NAMES {
686 
            // Require max_len + 1 to account for an optional NUL terminator.
687 
            if tz.len() >= max_len {
688 
                failed_tz_names.push(tz);
689 
            }
690 
        }
691
692 
        assert!(
693 
            failed_tz_names.is_empty(),
694 
            "One or more timezone names exceed the buffer length of {}. Max length of found timezone: {}\n{:?}",
695 
            max_len,
696 
            failed_tz_names.iter().map(|s| s.len()).max().unwrap(),
697 
            failed_tz_names
698 
        );
699 
    }
700
701 
    #[test]
702 
    fn test_tzname_buffer_correct_size() {
703 
        assert_eq!(
704 
            MAX_LEN, 64,
705 
            "Buffer length changed unexpectedly, ensure consistency with documented limit."
706 
        );
707 
        assert_eq!(
708 
            tzname_buf().len(),
709 
            MAX_LEN,
710 
            "Buffer length changed unexpectedly, ensure consistency with documented limit."
711 
        );
712 
        assert_eq!(
713 
            size_of_val(&tzname_buf()),
714 
            MAX_LEN,
715 
            "Buffer length changed unexpectedly, ensure consistency with documented limit."
716 
        );
717 
    }
718 
}