Paths with intermediate subdirectories are not invalid

[vt-alt]

The link validity check is too strict:

    /* The linkname must not contain '/' in the middle. */
    char *slash = strchr(linkname, '/');
    if (slash) {
        int linkname_len = strnlen(linkname, MAX_FILENAME_LEN) - 1;
        if (slash - linkname != linkname_len) {
            return LINK_INVALID;
        }
    }

    /* '/' must be at the end to be a valid directory name */
    if (linkname[strnlen(linkname, MAX_FILENAME_LEN) - 1] == '/') {
        return LINK_UNINITIALISED_DIR;
    }

For example, we have page https://git.altlinux.org/tasks/archive/done/_395/404560/ but the index page links to deeper directories than just the next level. Such as href="build/100/i586/". This is not an invalid link, but we can derive there is at least the next level dir build/.

Having this dir listed would be a great addition! Thanks,