Function dirnameWindows [src]

Prototype

pub fn dirnameWindows(path: []const u8) ?[]const u8

Parameters

path: []const u8

Example

 test dirnameWindows {
    try testDirnameWindows("c:\\", null);
    try testDirnameWindows("c:\\foo", "c:\\");
    try testDirnameWindows("c:\\foo\\", "c:\\");
    try testDirnameWindows("c:\\foo\\bar", "c:\\foo");
    try testDirnameWindows("c:\\foo\\bar\\", "c:\\foo");
    try testDirnameWindows("c:\\foo\\bar\\baz", "c:\\foo\\bar");
    try testDirnameWindows("\\", null);
    try testDirnameWindows("\\foo", "\\");
    try testDirnameWindows("\\foo\\", "\\");
    try testDirnameWindows("\\foo\\bar", "\\foo");
    try testDirnameWindows("\\foo\\bar\\", "\\foo");
    try testDirnameWindows("\\foo\\bar\\baz", "\\foo\\bar");
    try testDirnameWindows("c:", null);
    try testDirnameWindows("c:foo", null);
    try testDirnameWindows("c:foo\\", null);
    try testDirnameWindows("c:foo\\bar", "c:foo");
    try testDirnameWindows("c:foo\\bar\\", "c:foo");
    try testDirnameWindows("c:foo\\bar\\baz", "c:foo\\bar");
    try testDirnameWindows("file:stream", null);
    try testDirnameWindows("dir\\file:stream", "dir");
    try testDirnameWindows("\\\\unc\\share", null);
    try testDirnameWindows("\\\\unc\\share\\foo", "\\\\unc\\share\\");
    try testDirnameWindows("\\\\unc\\share\\foo\\", "\\\\unc\\share\\");
    try testDirnameWindows("\\\\unc\\share\\foo\\bar", "\\\\unc\\share\\foo");
    try testDirnameWindows("\\\\unc\\share\\foo\\bar\\", "\\\\unc\\share\\foo");
    try testDirnameWindows("\\\\unc\\share\\foo\\bar\\baz", "\\\\unc\\share\\foo\\bar");
    try testDirnameWindows("/a/b/", "/a");
    try testDirnameWindows("/a/b", "/a");
    try testDirnameWindows("/a", "/");
    try testDirnameWindows("", null);
    try testDirnameWindows("/", null);
    try testDirnameWindows("////", null);
    try testDirnameWindows("foo", null);
}

Source

  pub fn dirnameWindows(path: []const u8) ?[]const u8 {
    if (path.len == 0)
        return null;

    const root_slice = diskDesignatorWindows(path);
    if (path.len == root_slice.len)
        return null;

    const have_root_slash = path.len > root_slice.len and (path[root_slice.len] == '/' or path[root_slice.len] == '\\');

    var end_index: usize = path.len - 1;

    while (path[end_index] == '/' or path[end_index] == '\\') {
        if (end_index == 0)
            return null;
        end_index -= 1;
    }

    while (path[end_index] != '/' and path[end_index] != '\\') {
        if (end_index == 0)
            return null;
        end_index -= 1;
    }

    if (have_root_slash and end_index == root_slice.len) {
        end_index += 1;
    }

    if (end_index == 0)
        return null;

    return path[0..end_index];
}  