DragonOS/kernel/src/filesystem/vfs/utils.rs

/// @brief 切分路径字符串，返回最左侧那一级的目录名和剩余的部分。
///
/// 举例：对于 /123/456/789/   本函数返回的第一个值为123, 第二个值为456/789
pub fn split_path(path: &str) -> (&str, Option<&str>) {
    let mut path_split: core::str::SplitN<&str> = path.trim_matches('/').splitn(2, "/");
    let comp = path_split.next().unwrap_or("");
    let rest_opt = path_split.next();

    return (comp, rest_opt);
}

/// @brief 切分路径字符串，返回最右侧那一级的目录名和剩余的部分。
///
/// 举例：对于 /123/456/789/   本函数返回的第一个值为789, 第二个值为123/456
pub fn rsplit_path(path: &str) -> (&str, Option<&str>) {
    let mut path_split: core::str::RSplitN<&str> = path.trim_matches('/').rsplitn(2, "/");
    let comp = path_split.next().unwrap_or("");
    let rest_opt = path_split.next();

    return (comp, rest_opt);
}