Function removeDotDirsSanitized [src]

Removes '.' and '..' path components from a "sanitized relative path". A "sanitized path" is one where: all forward slashes have been replaced with back slashes all repeating back slashes have been collapsed the path is a relative one (does not start with a back slash)

Prototype

pub fn removeDotDirsSanitized(comptime T: type, path: []T) RemoveDotDirsError!usize

Parameters

T: typepath: []T

Possible Errors

TooManyParentDirs

Source

  pub fn removeDotDirsSanitized(comptime T: type, path: []T) RemoveDotDirsError!usize {
    std.debug.assert(path.len == 0 or path[0] != '\\');

    var write_idx: usize = 0;
    var read_idx: usize = 0;
    while (read_idx < path.len) {
        if (path[read_idx] == '.') {
            if (read_idx + 1 == path.len)
                return write_idx;

            const after_dot = path[read_idx + 1];
            if (after_dot == '\\') {
                read_idx += 2;
                continue;
            }
            if (after_dot == '.' and (read_idx + 2 == path.len or path[read_idx + 2] == '\\')) {
                if (write_idx == 0) return error.TooManyParentDirs;
                std.debug.assert(write_idx >= 2);
                write_idx -= 1;
                while (true) {
                    write_idx -= 1;
                    if (write_idx == 0) break;
                    if (path[write_idx] == '\\') {
                        write_idx += 1;
                        break;
                    }
                }
                if (read_idx + 2 == path.len)
                    return write_idx;
                read_idx += 3;
                continue;
            }
        }

        // skip to the next path separator
        while (true) : (read_idx += 1) {
            if (read_idx == path.len)
                return write_idx;
            path[write_idx] = path[read_idx];
            write_idx += 1;
            if (path[read_idx] == '\\')
                break;
        }
        read_idx += 1;
    }
    return write_idx;
}  