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◆ only-help-103 oxygen / vendor / iana-time-zone / src / tz_illumos.rs
799 B · 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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use std::fs::OpenOptions;
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use std::io::{BufRead, BufReader};
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pub(crate) fn get_timezone_inner() -> Result<String, crate::GetTimezoneError> {
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    // https://illumos.org/man/5/TIMEZONE
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    // https://docs.oracle.com/cd/E23824_01/html/821-1473/uc-timezone-4.html
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    let file = OpenOptions::new().read(true).open("/etc/default/init")?;
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    let mut reader = BufReader::with_capacity(1536, file);
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    let mut line = String::with_capacity(80);
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    loop {
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        line.clear();
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        let count = reader.read_line(&mut line)?;
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        if count == 0 {
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            return Err(crate::GetTimezoneError::FailedParsingString);
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        } else if line.starts_with("TZ=") {
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            line.truncate(line.trim_end().len());
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            line.replace_range(..3, "");
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            return Ok(line);
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        }
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    }
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}