72 lines
2.4 KiB
Rust
72 lines
2.4 KiB
Rust
#![warn(clippy::all)]
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#![warn(clippy::cargo)]
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#![warn(clippy::undocumented_unsafe_blocks)]
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#![allow(unknown_lints)]
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#![warn(missing_copy_implementations)]
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#![warn(missing_debug_implementations)]
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#![warn(missing_docs)]
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#![warn(rust_2018_idioms)]
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#![warn(trivial_casts, trivial_numeric_casts)]
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#![warn(unsafe_op_in_unsafe_fn)]
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#![warn(unused_qualifications)]
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#![warn(variant_size_differences)]
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//! # iana-time-zone-haiku
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//!
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//! [](https://crates.io/crates/iana-time-zone-haiku)
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//! [](https://docs.rs/iana-time-zone/)
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//! [](https://crates.io/crates/iana-time-zone-haiku)
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//! [](https://github.com/strawlab/iana-time-zone/actions?query=branch%3Amain)
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//!
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//! [iana-time-zone](https://github.com/strawlab/iana-time-zone) support crate for Haiku OS.
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use std::os::raw::c_char;
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extern "C" {
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fn iana_time_zone_haiku_get_tz(buf: *mut c_char, buf_size: usize) -> usize;
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}
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/// Get the current IANA time zone as a string.
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///
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/// On Haiku platforms this function will return [`Some`] with the timezone string
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/// or [`None`] if an error occurs. On all other platforms, [`None`] is returned.
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///
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/// # Examples
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///
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/// ```
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/// let timezone = iana_time_zone_haiku::get_timezone();
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/// ```
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#[must_use]
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pub fn get_timezone() -> Option<String> {
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// The longest name in the IANA time zone database is 25 ASCII characters long.
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let mut buf = [0u8; 32];
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// SAFETY: a valid, aligned, non-NULL pointer and length are given which
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// point to a single allocation.
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let len = unsafe {
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let buf_size = buf.len();
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let buf_ptr = buf.as_mut_ptr().cast::<c_char>();
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iana_time_zone_haiku_get_tz(buf_ptr, buf_size)
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};
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// The name should not be empty, or excessively long.
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match buf.get(..len)? {
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b"" => None,
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s => Some(std::str::from_utf8(s).ok()?.to_owned()),
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}
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}
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#[cfg(test)]
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mod tests {
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#[test]
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#[cfg(not(target_os = "haiku"))]
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fn test_fallback_on_non_haiku_platforms() {
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assert!(super::get_timezone().is_none());
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}
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#[test]
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#[cfg(target_os = "haiku")]
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fn test_retrieve_time_zone_on_haiku_platforms() {
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let timezone = super::get_timezone().unwrap();
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assert!(!timezone.is_empty());
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}
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}
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