Function parse_capacity_limit

benchmarks/src/util/options.rs:154–174

Parse capacity limit from string to number of bytes by allowing units: K, M and G. Supports formats like '1.5G' -> 1610612736, '100M' -> 104857600

(limit: &str)

/// Parse capacity limit from string to number of bytes by allowing units: K, M and G.
/// Supports formats like '1.5G' -> 1610612736, '100M' -> 104857600
fn parse_capacity_limit(limit: &str) -> Result<usize, String> {
    if limit.trim().is_empty() {
        return Err("Capacity limit cannot be empty".to_string());
    }
    let (number, unit) = limit.split_at(limit.len() - 1);
    let number: f64 = number
        .parse()
        .map_err(|_| format!("Failed to parse number from capacity limit '{limit}'"))?;
    if number.is_sign_negative() || number.is_infinite() {
        return Err("Limit value should be positive finite number".to_string());
    }

    match unit {
        "K" => Ok((number * 1024.0) as usize),
        "M" => Ok((number * 1024.0 * 1024.0) as usize),
        "G" => Ok((number * 1024.0 * 1024.0 * 1024.0) as usize),
        _ => Err(format!(
            "Unsupported unit '{unit}' in capacity limit '{limit}'. Unit must be one of: 'K', 'M', 'G'"
        )),
    }
}

#[cfg(test)]
mod tests {