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</pre><pre class="rust"><code><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>get_timezone_inner() -> <span class="prelude-ty">Result</span><String, <span class="kw">crate</span>::GetTimezoneError> {
get_timezone().ok_or(<span class="kw">crate</span>::GetTimezoneError::OsError)
}
<span class="attr">#[inline]
</span><span class="kw">fn </span>get_timezone() -> <span class="prelude-ty">Option</span><String> {
<span class="comment">// The longest name in the IANA time zone database is 25 ASCII characters long.
</span><span class="kw">const </span>MAX_LEN: usize = <span class="number">32</span>;
<span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; MAX_LEN];
<span class="comment">// Get system time zone, and borrow its name.
</span><span class="kw">let </span>tz = system_time_zone::SystemTimeZone::new()<span class="question-mark">?</span>;
<span class="kw">let </span>name = tz.name()<span class="question-mark">?</span>;
<span class="comment">// If the name is encoded in UTF-8, copy it directly.
</span><span class="kw">let </span>name = <span class="kw">if let </span><span class="prelude-val">Some</span>(name) = name.as_utf8() {
name
} <span class="kw">else </span>{
<span class="comment">// Otherwise convert the name to UTF-8.
</span>name.to_utf8(<span class="kw-2">&mut </span>buf)<span class="question-mark">?
</span>};
<span class="kw">if </span>name.is_empty() || name.len() >= MAX_LEN {
<span class="comment">// The name should not be empty, or excessively long.
</span><span class="prelude-val">None
</span>} <span class="kw">else </span>{
<span class="prelude-val">Some</span>(name.to_owned())
}
}
<span class="kw">mod </span>system_time_zone {
<span class="doccomment">//! create a safe wrapper around `CFTimeZoneRef`
</span><span class="kw">use </span>core_foundation_sys::base::{CFRelease, CFTypeRef};
<span class="kw">use </span>core_foundation_sys::timezone::{CFTimeZoneCopySystem, CFTimeZoneGetName, CFTimeZoneRef};
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>SystemTimeZone(CFTimeZoneRef);
<span class="kw">impl </span>Drop <span class="kw">for </span>SystemTimeZone {
<span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) {
<span class="comment">// SAFETY: `SystemTimeZone` is only ever created with a valid `CFTimeZoneRef`.
</span><span class="kw">unsafe </span>{ CFRelease(<span class="self">self</span>.<span class="number">0 </span><span class="kw">as </span>CFTypeRef) };
}
}
<span class="kw">impl </span>SystemTimeZone {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new() -> <span class="prelude-ty">Option</span><<span class="self">Self</span>> {
<span class="comment">// SAFETY: No invariants to uphold. We'll release the pointer when we don't need it anymore.
</span><span class="kw">let </span>v: CFTimeZoneRef = <span class="kw">unsafe </span>{ CFTimeZoneCopySystem() };
<span class="kw">if </span>v.is_null() {
<span class="prelude-val">None
</span>} <span class="kw">else </span>{
<span class="prelude-val">Some</span>(SystemTimeZone(v))
}
}
<span class="doccomment">/// Get the time zone name as a [super::string_ref::StringRef].
///
/// The lifetime of the `StringRef` is bound to our lifetime. Mutable
/// access is also prevented by taking a reference to `self`.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw">super</span>::string_ref::StringRef<<span class="lifetime">'_</span>, <span class="self">Self</span>>> {
<span class="comment">// SAFETY: `SystemTimeZone` is only ever created with a valid `CFTimeZoneRef`.
</span><span class="kw">let </span>string = <span class="kw">unsafe </span>{ CFTimeZoneGetName(<span class="self">self</span>.<span class="number">0</span>) };
<span class="kw">if </span>string.is_null() {
<span class="prelude-val">None
</span>} <span class="kw">else </span>{
<span class="comment">// SAFETY: here we ensure that `string` is a valid pointer.
</span><span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ <span class="kw">super</span>::string_ref::StringRef::new(string, <span class="self">self</span>) })
}
}
}
}
<span class="kw">mod </span>string_ref {
<span class="doccomment">//! create safe wrapper around `CFStringRef`
</span><span class="kw">use </span>std::convert::TryInto;
<span class="kw">use </span>core_foundation_sys::base::{Boolean, CFRange};
<span class="kw">use </span>core_foundation_sys::string::{
kCFStringEncodingUTF8, CFStringGetBytes, CFStringGetCStringPtr, CFStringGetLength,
CFStringRef,
};
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>StringRef<<span class="lifetime">'a</span>, T> {
string: CFStringRef,
<span class="comment">// We exclude mutable access to the parent by taking a reference to the
// parent (rather than, for example, just using a marker to enforce the
// parent's lifetime).
</span>_parent: <span class="kw-2">&</span><span class="lifetime">'a </span>T,
}
<span class="kw">impl</span><<span class="lifetime">'a</span>, T> StringRef<<span class="lifetime">'a</span>, T> {
<span class="comment">// SAFETY: `StringRef` must be valid pointer
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe fn </span>new(string: CFStringRef, _parent: <span class="kw-2">&</span><span class="lifetime">'a </span>T) -> <span class="self">Self </span>{
<span class="self">Self </span>{ string, _parent }
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>as_utf8(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str> {
<span class="comment">// SAFETY: `StringRef` is only ever created with a valid `CFStringRef`.
</span><span class="kw">let </span>v = <span class="kw">unsafe </span>{ CFStringGetCStringPtr(<span class="self">self</span>.string, kCFStringEncodingUTF8) };
<span class="kw">if </span>!v.is_null() {
<span class="comment">// SAFETY: `CFStringGetCStringPtr()` returns NUL-terminated strings.
</span><span class="kw">let </span>v = <span class="kw">unsafe </span>{ std::ffi::CStr::from_ptr(v) };
<span class="kw">if let </span><span class="prelude-val">Ok</span>(v) = v.to_str() {
<span class="kw">return </span><span class="prelude-val">Some</span>(v);
}
}
<span class="prelude-val">None
</span>}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>to_utf8<<span class="lifetime">'b</span>>(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'b </span><span class="kw-2">mut </span>[u8]) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'b </span>str> {
<span class="comment">// SAFETY: `StringRef` is only ever created with a valid `CFStringRef`.
</span><span class="kw">let </span>length = <span class="kw">unsafe </span>{ CFStringGetLength(<span class="self">self</span>.string) };
<span class="kw">let </span><span class="kw-2">mut </span>buf_bytes = <span class="number">0</span>;
<span class="kw">let </span>range = CFRange {
location: <span class="number">0</span>,
length,
};
<span class="kw">let </span>converted_bytes = <span class="kw">unsafe </span>{
<span class="comment">// SAFETY: `StringRef` is only ever created with a valid `CFStringRef`.
</span>CFStringGetBytes(
<span class="self">self</span>.string,
range,
kCFStringEncodingUTF8,
<span class="string">b'\0'</span>,
<span class="bool-val">false </span><span class="kw">as </span>Boolean,
buf.as_mut_ptr(),
buf.len() <span class="kw">as </span>isize,
<span class="kw-2">&mut </span>buf_bytes,
)
};
<span class="kw">if </span>converted_bytes != length {
<span class="kw">return </span><span class="prelude-val">None</span>;
}
<span class="kw">let </span>len = buf_bytes.try_into().ok()<span class="question-mark">?</span>;
<span class="kw">let </span>s = buf.get(..len)<span class="question-mark">?</span>;
std::str::from_utf8(s).ok()
}
}
}
</code></pre></div>
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