static char *
realpath_for_fs(const char *path, char *resolved_path, int maxreslth, apr_pool_t *p) {

    int readlinks = 0;
    int n;

    char *npath;
    char link_path[PATH_MAX+1];
    char *buf;

    buf = apr_pcalloc(p, sizeof(char *));
    npath = resolved_path;

    if (*path != '/') {
        if (!getcwd(npath, maxreslth-2))
            return NULL;
        npath += strlen(npath);
        if (npath[-1] != '/')
            *npath++ = '/';
    } else {
        *npath++ = '/';
        path++;
    }

    while (*path != '\0') {

        if (*path == '/') {
            path++;
            continue;
        }

        if (*path == '.' && (path[1] == '\0' || path[1] == '/')) {
            path++;
            continue;
        }

        if (*path == '.' && path[1] == '.' &&
            (path[2] == '\0' || path[2] == '/')) {
            path += 2;
            while (npath > resolved_path+1 &&
                   (--npath)[-1] != '/')
                ;
            continue;
        }

        while (*path != '\0' && *path != '/') {
            if (npath-resolved_path > maxreslth-2) {
                errno = ENAMETOOLONG;
                return NULL;
            }
            *npath++ = *path++;
        }

        if (readlinks++ > MAXSYMLINKS) {
            errno = ELOOP;
            return NULL;
        }

        *npath = '\0';
        n = readlink(resolved_path, link_path, PATH_MAX);
        if (n < 0) {
            if (errno != EINVAL) {
                return NULL;
            }
        } else {
            int m;
            char *newbuf;

            link_path[n] = '\0';
            if (*link_path == '/')
                npath = resolved_path;
            else
                while (*(--npath) != '/')
                    ;

            m = strlen(path);
            newbuf = apr_pcalloc(p, m + n + 1);
            memcpy(newbuf, link_path, n);
            memcpy(newbuf + n, path, m + 1);
            path = buf = newbuf;
        }
        *npath++ = '/';
    }

    if (npath != resolved_path+1 && npath[-1] == '/')
        npath--;

    *npath = '\0';

    return resolved_path;

}